<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.20.4</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>355</ContextCount>
  <ElementCount>507</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>115</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>9</UnitCount>
  <MyReports>
    <Report instance="skyw-20201231x10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>00090 - Document - Document and Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.skywest.com/role/DocumentDocumentAndEntityInformation</Role>
      <ShortName>Document and Entity Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="skyw-20201231x10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>00100 - Statement - CONSOLIDATED BALANCE SHEETS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.skywest.com/role/StatementConsolidatedBalanceSheets</Role>
      <ShortName>CONSOLIDATED BALANCE SHEETS</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="skyw-20201231x10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>00105 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.skywest.com/role/StatementConsolidatedBalanceSheetsParenthetical</Role>
      <ShortName>CONSOLIDATED BALANCE SHEETS (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="skyw-20201231x10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>00200 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.skywest.com/role/StatementConsolidatedStatementsOfComprehensiveIncomeLoss</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="skyw-20201231x10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>00300 - Statement - CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.skywest.com/role/StatementConsolidatedStatementsOfStockholdersEquity</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="skyw-20201231x10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>00305 - Statement - CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.skywest.com/role/StatementConsolidatedStatementsOfStockholdersEquityParenthetical</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="skyw-20201231x10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>00400 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.skywest.com/role/StatementConsolidatedStatementsOfCashFlows</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF CASH FLOWS</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="skyw-20201231x10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>10101 - Disclosure - Nature of Operations and Summary of Significant Accounting Policies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.skywest.com/role/DisclosureNatureOfOperationsAndSummaryOfSignificantAccountingPolicies</Role>
      <ShortName>Nature of Operations and Summary of Significant Accounting Policies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="skyw-20201231x10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>10201 - Disclosure - Impact of the COVID-19 Pandemic</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.skywest.com/role/DisclosureImpactOfCovid19Pandemic</Role>
      <ShortName>Impact of the COVID-19 Pandemic</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="skyw-20201231x10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>10301 - Disclosure - Segment Reporting</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.skywest.com/role/DisclosureSegmentReporting</Role>
      <ShortName>Segment Reporting</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="skyw-20201231x10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>10401 - Disclosure - Long-term Debt</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.skywest.com/role/DisclosureLongTermDebt</Role>
      <ShortName>Long-term Debt</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="skyw-20201231x10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>10501 - Disclosure - Income Taxes</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.skywest.com/role/DisclosureIncomeTaxes</Role>
      <ShortName>Income Taxes</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="skyw-20201231x10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>10601 - Disclosure - Commitments and Contingencies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.skywest.com/role/DisclosureCommitmentsAndContingencies</Role>
      <ShortName>Commitments and Contingencies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="skyw-20201231x10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>10701 - Disclosure - Leases</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.skywest.com/role/DisclosureLeases</Role>
      <ShortName>Leases</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="skyw-20201231x10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>10801 - Disclosure - Fair Value Measurements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.skywest.com/role/DisclosureFairValueMeasurements</Role>
      <ShortName>Fair Value Measurements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="skyw-20201231x10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>10901 - Disclosure - Special Items</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.skywest.com/role/DisclosureSpecialItems</Role>
      <ShortName>Special Items</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="skyw-20201231x10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>11001 - Disclosure - Capital Transactions</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.skywest.com/role/DisclosureCapitalTransactions</Role>
      <ShortName>Capital Transactions</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="skyw-20201231x10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>11101 - Disclosure - Retirement Plans and Employee Stock Purchase Plans</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.skywest.com/role/DisclosureRetirementPlansAndEmployeeStockPurchasePlans</Role>
      <ShortName>Retirement Plans and Employee Stock Purchase Plans</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="skyw-20201231x10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>11201 - Disclosure - Stock Repurchase</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.skywest.com/role/DisclosureStockRepurchase</Role>
      <ShortName>Stock Repurchase</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="skyw-20201231x10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>11301 - Disclosure - Related-Party Transactions</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.skywest.com/role/DisclosureRelatedPartyTransactions</Role>
      <ShortName>Related-Party Transactions</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="skyw-20201231x10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>11401 - Disclosure - Gain on Sale of ExpressJet</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.skywest.com/role/DisclosureGainOnSaleOfExpressjet</Role>
      <ShortName>Gain on Sale of ExpressJet</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="skyw-20201231x10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>11501 - Disclosure - Investment in Other Companies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.skywest.com/role/DisclosureInvestmentInOtherCompanies</Role>
      <ShortName>Investment in Other Companies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="skyw-20201231x10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>11601 - Disclosure - Subsequent Events</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.skywest.com/role/DisclosureSubsequentEvents</Role>
      <ShortName>Subsequent Events</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="skyw-20201231x10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>11701 - Disclosure - Quarterly Financial Data (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.skywest.com/role/DisclosureQuarterlyFinancialDataUnaudited</Role>
      <ShortName>Quarterly Financial Data (Unaudited)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="skyw-20201231x10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>11801 - Disclosure - SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.skywest.com/role/DisclosureScheduleIiValuationAndQualifyingAccounts</Role>
      <ShortName>SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>25</Position>
    </Report>
    <Report instance="skyw-20201231x10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>20102 - Disclosure - Nature of Operations and Summary of Significant Accounting Policies (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.skywest.com/role/DisclosureNatureOfOperationsAndSummaryOfSignificantAccountingPoliciesPolicies</Role>
      <ShortName>Nature of Operations and Summary of Significant Accounting Policies (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <ParentRole>http://www.skywest.com/role/DisclosureNatureOfOperationsAndSummaryOfSignificantAccountingPolicies</ParentRole>
      <Position>26</Position>
    </Report>
    <Report instance="skyw-20201231x10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>30103 - Disclosure - Nature of Operations and Summary of Significant Accounting Policies (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.skywest.com/role/DisclosureNatureOfOperationsAndSummaryOfSignificantAccountingPoliciesTables</Role>
      <ShortName>Nature of Operations and Summary of Significant Accounting Policies (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.skywest.com/role/DisclosureNatureOfOperationsAndSummaryOfSignificantAccountingPolicies</ParentRole>
      <Position>27</Position>
    </Report>
    <Report instance="skyw-20201231x10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>30303 - Disclosure - Segment Reporting (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.skywest.com/role/DisclosureSegmentReportingTables</Role>
      <ShortName>Segment Reporting (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.skywest.com/role/DisclosureSegmentReporting</ParentRole>
      <Position>28</Position>
    </Report>
    <Report instance="skyw-20201231x10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>30403 - Disclosure - Long-term Debt (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.skywest.com/role/DisclosureLongTermDebtTables</Role>
      <ShortName>Long-term Debt (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.skywest.com/role/DisclosureLongTermDebt</ParentRole>
      <Position>29</Position>
    </Report>
    <Report instance="skyw-20201231x10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>30503 - Disclosure - Income Taxes (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.skywest.com/role/DisclosureIncomeTaxesTables</Role>
      <ShortName>Income Taxes (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.skywest.com/role/DisclosureIncomeTaxes</ParentRole>
      <Position>30</Position>
    </Report>
    <Report instance="skyw-20201231x10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>30703 - Disclosure - Leases (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.skywest.com/role/DisclosureLeasesTables</Role>
      <ShortName>Leases (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.skywest.com/role/DisclosureLeases</ParentRole>
      <Position>31</Position>
    </Report>
    <Report instance="skyw-20201231x10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>30803 - Disclosure - Fair Value Measurements (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.skywest.com/role/DisclosureFairValueMeasurementsTables</Role>
      <ShortName>Fair Value Measurements (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.skywest.com/role/DisclosureFairValueMeasurements</ParentRole>
      <Position>32</Position>
    </Report>
    <Report instance="skyw-20201231x10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>30903 - Disclosure - Special Items (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.skywest.com/role/DisclosureSpecialItemsTables</Role>
      <ShortName>Special Items (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.skywest.com/role/DisclosureSpecialItems</ParentRole>
      <Position>33</Position>
    </Report>
    <Report instance="skyw-20201231x10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>31003 - Disclosure - Capital Transactions (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.skywest.com/role/DisclosureCapitalTransactionsTables</Role>
      <ShortName>Capital Transactions (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.skywest.com/role/DisclosureCapitalTransactions</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="skyw-20201231x10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>31103 - Disclosure - Retirement Plans and Employee Stock Purchase Plans (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.skywest.com/role/DisclosureRetirementPlansAndEmployeeStockPurchasePlansTables</Role>
      <ShortName>Retirement Plans and Employee Stock Purchase Plans (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.skywest.com/role/DisclosureRetirementPlansAndEmployeeStockPurchasePlans</ParentRole>
      <Position>35</Position>
    </Report>
    <Report instance="skyw-20201231x10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>31703 - Disclosure - Quarterly Financial Data (Unaudited) (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.skywest.com/role/DisclosureQuarterlyFinancialDataUnauditedTables</Role>
      <ShortName>Quarterly Financial Data (Unaudited) (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.skywest.com/role/DisclosureQuarterlyFinancialDataUnaudited</ParentRole>
      <Position>36</Position>
    </Report>
    <Report instance="skyw-20201231x10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>40101 - Disclosure - Nature of Operations and Summary of Significant Accounting Policies - Aircraft Fleet (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.skywest.com/role/DisclosureNatureOfOperationsAndSummaryOfSignificantAccountingPoliciesAircraftFleetDetails</Role>
      <ShortName>Nature of Operations and Summary of Significant Accounting Policies - Aircraft Fleet (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>37</Position>
    </Report>
    <Report instance="skyw-20201231x10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>40102 - Disclosure - Nature of Operations and Summary of Significant Accounting Policies - Cash and Cash Equivalents (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.skywest.com/role/DisclosureNatureOfOperationsAndSummaryOfSignificantAccountingPoliciesCashAndCashEquivalentsDetails</Role>
      <ShortName>Nature of Operations and Summary of Significant Accounting Policies - Cash and Cash Equivalents (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>38</Position>
    </Report>
    <Report instance="skyw-20201231x10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>40103 - Disclosure - Nature of Operations and Summary of Significant Accounting Policies - Marketable Securities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.skywest.com/role/DisclosureNatureOfOperationsAndSummaryOfSignificantAccountingPoliciesMarketableSecuritiesDetails</Role>
      <ShortName>Nature of Operations and Summary of Significant Accounting Policies - Marketable Securities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>39</Position>
    </Report>
    <Report instance="skyw-20201231x10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>40104 - Disclosure - Nature of Operations and Summary of Significant Accounting Policies - Inventories (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.skywest.com/role/DisclosureNatureOfOperationsAndSummaryOfSignificantAccountingPoliciesInventoriesDetails</Role>
      <ShortName>Nature of Operations and Summary of Significant Accounting Policies - Inventories (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.skywest.com/role/DisclosureNatureOfOperationsAndSummaryOfSignificantAccountingPoliciesTables</ParentRole>
      <Position>40</Position>
    </Report>
    <Report instance="skyw-20201231x10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>40105 - Disclosure - Nature of Operations and Summary of Significant Accounting Policies - Property and Equipment (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.skywest.com/role/DisclosureNatureOfOperationsAndSummaryOfSignificantAccountingPoliciesPropertyAndEquipmentDetails</Role>
      <ShortName>Nature of Operations and Summary of Significant Accounting Policies - Property and Equipment (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>41</Position>
    </Report>
    <Report instance="skyw-20201231x10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>40106 - Disclosure - Nature of Operations and Summary of Significant Accounting Policies - Long-Lived Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.skywest.com/role/DisclosureNatureOfOperationsAndSummaryOfSignificantAccountingPoliciesLongLivedAssetsDetails</Role>
      <ShortName>Nature of Operations and Summary of Significant Accounting Policies - Long-Lived Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>42</Position>
    </Report>
    <Report instance="skyw-20201231x10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>40107 - Disclosure - Nature of Operations and Summary of Significant Accounting Policies - Capitalized Interest and Maintenance (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.skywest.com/role/DisclosureNatureOfOperationsAndSummaryOfSignificantAccountingPoliciesCapitalizedInterestAndMaintenanceDetails</Role>
      <ShortName>Nature of Operations and Summary of Significant Accounting Policies - Capitalized Interest and Maintenance (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>43</Position>
    </Report>
    <Report instance="skyw-20201231x10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>40108 - Disclosure - Nature of Operations and Summary of Significant Accounting Policies - Flying Agreements (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.skywest.com/role/DisclosureNatureOfOperationsAndSummaryOfSignificantAccountingPoliciesFlyingAgreementsDetails</Role>
      <ShortName>Nature of Operations and Summary of Significant Accounting Policies - Flying Agreements (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>44</Position>
    </Report>
    <Report instance="skyw-20201231x10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>40109 - Disclosure - Nature of Operations and Summary of Significant Accounting Policies - Net Income (Loss) Per Common Share and Fair Value (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.skywest.com/role/DisclosureNatureOfOperationsAndSummaryOfSignificantAccountingPoliciesNetIncomeLossPerCommonShareAndFairValueDetails</Role>
      <ShortName>Nature of Operations and Summary of Significant Accounting Policies - Net Income (Loss) Per Common Share and Fair Value (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.skywest.com/role/DisclosureNatureOfOperationsAndSummaryOfSignificantAccountingPoliciesTables</ParentRole>
      <Position>45</Position>
    </Report>
    <Report instance="skyw-20201231x10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>40110 - Disclosure - Nature of Operations and Summary of Significant Accounting Policies - Recent Accounting Pronouncements (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.skywest.com/role/DisclosureNatureOfOperationsAndSummaryOfSignificantAccountingPoliciesRecentAccountingPronouncementsDetails</Role>
      <ShortName>Nature of Operations and Summary of Significant Accounting Policies - Recent Accounting Pronouncements (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>46</Position>
    </Report>
    <Report instance="skyw-20201231x10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>40201 - Disclosure - Impact of the COVID-19 Pandemic (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.skywest.com/role/DisclosureImpactOfCovid19PandemicDetails</Role>
      <ShortName>Impact of the COVID-19 Pandemic (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.skywest.com/role/DisclosureImpactOfCovid19Pandemic</ParentRole>
      <Position>47</Position>
    </Report>
    <Report instance="skyw-20201231x10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>40301 - Disclosure - Segment Reporting (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.skywest.com/role/DisclosureSegmentReportingDetails</Role>
      <ShortName>Segment Reporting (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.skywest.com/role/DisclosureSegmentReportingTables</ParentRole>
      <Position>48</Position>
    </Report>
    <Report instance="skyw-20201231x10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>40401 - Disclosure - Long-term Debt (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.skywest.com/role/DisclosureLongTermDebtDetails</Role>
      <ShortName>Long-term Debt (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.skywest.com/role/DisclosureLongTermDebtTables</ParentRole>
      <Position>49</Position>
    </Report>
    <Report instance="skyw-20201231x10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>40501 - Disclosure - Income Taxes - Provision (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.skywest.com/role/DisclosureIncomeTaxesProvisionDetails</Role>
      <ShortName>Income Taxes - Provision (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>50</Position>
    </Report>
    <Report instance="skyw-20201231x10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>40502 - Disclosure - Income Taxes - Reconciliation (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.skywest.com/role/DisclosureIncomeTaxesReconciliationDetails</Role>
      <ShortName>Income Taxes - Reconciliation (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>51</Position>
    </Report>
    <Report instance="skyw-20201231x10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>40503 - Disclosure - Income Taxes - Net Operating Losses and Tax Rates (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.skywest.com/role/DisclosureIncomeTaxesNetOperatingLossesAndTaxRatesDetails</Role>
      <ShortName>Income Taxes - Net Operating Losses and Tax Rates (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>52</Position>
    </Report>
    <Report instance="skyw-20201231x10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>40504 - Disclosure - Income Taxes - Unrecognized Tax Benefits (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.skywest.com/role/DisclosureIncomeTaxesUnrecognizedTaxBenefitsDetails</Role>
      <ShortName>Income Taxes - Unrecognized Tax Benefits (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>53</Position>
    </Report>
    <Report instance="skyw-20201231x10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>40601 - Disclosure - Commitments and Contingencies (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.skywest.com/role/DisclosureCommitmentsAndContingenciesDetails</Role>
      <ShortName>Commitments and Contingencies (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.skywest.com/role/DisclosureCommitmentsAndContingencies</ParentRole>
      <Position>54</Position>
    </Report>
    <Report instance="skyw-20201231x10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>40701 - Disclosure - Leases (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.skywest.com/role/DisclosureLeasesDetails</Role>
      <ShortName>Leases (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.skywest.com/role/DisclosureLeasesTables</ParentRole>
      <Position>55</Position>
    </Report>
    <Report instance="skyw-20201231x10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>40702 - Disclosure - Leases - Operating Leases (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.skywest.com/role/DisclosureLeasesOperatingLeasesDetails</Role>
      <ShortName>Leases - Operating Leases (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>56</Position>
    </Report>
    <Report instance="skyw-20201231x10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>40801 - Disclosure - Fair Value Measurements (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.skywest.com/role/DisclosureFairValueMeasurementsDetails</Role>
      <ShortName>Fair Value Measurements (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.skywest.com/role/DisclosureFairValueMeasurementsTables</ParentRole>
      <Position>57</Position>
    </Report>
    <Report instance="skyw-20201231x10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>40901 - Disclosure - Special Items (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.skywest.com/role/DisclosureSpecialItemsDetails</Role>
      <ShortName>Special Items (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.skywest.com/role/DisclosureSpecialItemsTables</ParentRole>
      <Position>58</Position>
    </Report>
    <Report instance="skyw-20201231x10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>41001 - Disclosure - Capital Transactions - Preferred Stock (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.skywest.com/role/DisclosureCapitalTransactionsPreferredStockDetails</Role>
      <ShortName>Capital Transactions - Preferred Stock (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>59</Position>
    </Report>
    <Report instance="skyw-20201231x10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>41002 - Disclosure - Capital Transactions - Stock Compensation (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.skywest.com/role/DisclosureCapitalTransactionsStockCompensationDetails</Role>
      <ShortName>Capital Transactions - Stock Compensation (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>60</Position>
    </Report>
    <Report instance="skyw-20201231x10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>41003 - Disclosure - Capital Transactions - Information About Stock Options Outstanding (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.skywest.com/role/DisclosureCapitalTransactionsInformationAboutStockOptionsOutstandingDetails</Role>
      <ShortName>Capital Transactions - Information About Stock Options Outstanding (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>61</Position>
    </Report>
    <Report instance="skyw-20201231x10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>41101 - Disclosure - Retirement Plans and Employee Stock Purchase Plans - Retirement Plans (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.skywest.com/role/DisclosureRetirementPlansAndEmployeeStockPurchasePlansRetirementPlansDetails</Role>
      <ShortName>Retirement Plans and Employee Stock Purchase Plans - Retirement Plans (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>62</Position>
    </Report>
    <Report instance="skyw-20201231x10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>41102 - Disclosure - Retirement Plans and Employee Stock Purchase Plans - Employee Stock Purchase Plans (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.skywest.com/role/DisclosureRetirementPlansAndEmployeeStockPurchasePlansEmployeeStockPurchasePlansDetails</Role>
      <ShortName>Retirement Plans and Employee Stock Purchase Plans - Employee Stock Purchase Plans (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>63</Position>
    </Report>
    <Report instance="skyw-20201231x10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>41201 - Disclosure - Stock Repurchase (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.skywest.com/role/DisclosureStockRepurchaseDetails</Role>
      <ShortName>Stock Repurchase (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.skywest.com/role/DisclosureStockRepurchase</ParentRole>
      <Position>64</Position>
    </Report>
    <Report instance="skyw-20201231x10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>41301 - Disclosure - Related-Party Transactions (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.skywest.com/role/DisclosureRelatedPartyTransactionsDetails</Role>
      <ShortName>Related-Party Transactions (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.skywest.com/role/DisclosureRelatedPartyTransactions</ParentRole>
      <Position>65</Position>
    </Report>
    <Report instance="skyw-20201231x10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>41401 - Disclosure - Gain on Sale of ExpressJet (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.skywest.com/role/DisclosureGainOnSaleOfExpressjetDetails</Role>
      <ShortName>Gain on Sale of ExpressJet (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.skywest.com/role/DisclosureGainOnSaleOfExpressjet</ParentRole>
      <Position>66</Position>
    </Report>
    <Report instance="skyw-20201231x10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>41501 - Disclosure - Investment in Other Companies (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.skywest.com/role/DisclosureInvestmentInOtherCompaniesDetails</Role>
      <ShortName>Investment in Other Companies (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.skywest.com/role/DisclosureInvestmentInOtherCompanies</ParentRole>
      <Position>67</Position>
    </Report>
    <Report instance="skyw-20201231x10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>41601 - Disclosure - Subsequent Events (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.skywest.com/role/DisclosureSubsequentEventsDetails</Role>
      <ShortName>Subsequent Events (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.skywest.com/role/DisclosureSubsequentEvents</ParentRole>
      <Position>68</Position>
    </Report>
    <Report instance="skyw-20201231x10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>41701 - Disclosure - Quarterly Financial Data (Unaudited) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.skywest.com/role/DisclosureQuarterlyFinancialDataUnauditedDetails</Role>
      <ShortName>Quarterly Financial Data (Unaudited) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.skywest.com/role/DisclosureQuarterlyFinancialDataUnauditedTables</ParentRole>
      <Position>69</Position>
    </Report>
    <Report instance="skyw-20201231x10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>41801 - Disclosure - SCHEDULE II -VALUATION AND QUALIFYING ACCOUNTS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.skywest.com/role/DisclosureScheduleIiValuationAndQualifyingAccountsDetails</Role>
      <ShortName>SCHEDULE II -VALUATION AND QUALIFYING ACCOUNTS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>70</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File doctype="10-K" original="skyw-20201231x10k.htm">skyw-20201231x10k.htm</File>
    <File>skyw-20201231.xsd</File>
    <File>skyw-20201231_cal.xml</File>
    <File>skyw-20201231_def.xml</File>
    <File>skyw-20201231_lab.xml</File>
    <File>skyw-20201231_pre.xml</File>
    <File>skyw-20201231xex10d19.htm</File>
    <File>skyw-20201231xex10d23.htm</File>
    <File>skyw-20201231xex10d24.htm</File>
    <File>skyw-20201231xex10d25.htm</File>
    <File>skyw-20201231xex21d1.htm</File>
    <File>skyw-20201231xex23d1.htm</File>
    <File>skyw-20201231xex31d1.htm</File>
    <File>skyw-20201231xex31d2.htm</File>
    <File>skyw-20201231xex32d1.htm</File>
    <File>skyw-20201231xex32d2.htm</File>
    <File>skyw-20201231xex4d6.htm</File>
  </InputFiles>
  <SupplementalFiles>
    <File>skyw-20201231x10k002.jpg</File>
  </SupplementalFiles>
  <BaseTaxonomies>
    <BaseTaxonomy>http://fasb.org/us-gaap/2020-01-31</BaseTaxonomy>
    <BaseTaxonomy>http://xbrl.sec.gov/dei/2020-01-31</BaseTaxonomy>
    <BaseTaxonomy>http://fasb.org/srt/2020-01-31</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
