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Nature of Operations and Summary of Significant Accounting Policies (Details 5) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
segment
subsidiary
Dec. 31, 2013
Dec. 31, 2012
Other Revenue Items                      
Deemed rental income under code-share agreement                 $ 497,000,000skyw_DeemedRentalIncomeUnderCodeShareAgreements $ 500,200,000skyw_DeemedRentalIncomeUnderCodeShareAgreements $ 506,700,000skyw_DeemedRentalIncomeUnderCodeShareAgreements
Net Income (loss) Per Common Share                      
Number of outstanding options not included in computation of Diluted EPS (in shares)                 3,191,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 3,072,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 3,889,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Numerator                      
Net Income (loss) (27,868,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 41,338,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic (14,737,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic (22,887,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 8,609,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 26,394,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 20,720,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 3,233,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic (24,154,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 58,956,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 51,157,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Denominator                      
Denominator for basic earnings per-share weighted average shares 51,174,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 51,127,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 51,183,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 51,467,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 51,228,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 51,881,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 51,881,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 51,763,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 51,237,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 51,688,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 51,090,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Dilution due to stock options and restricted stock (in shares)                   734,000us-gaap_WeightedAverageNumberOfSharesRestrictedStock 656,000us-gaap_WeightedAverageNumberOfSharesRestrictedStock
Weighted average number of shares for diluted net income per common share 51,174,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 52,036,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 51,183,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 51,467,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 52,034,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 52,610,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 52,547,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 52,497,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 51,237,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 52,422,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 51,746,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic earnings (loss) per share (in dollars per share) $ (0.54)us-gaap_EarningsPerShareBasic $ 0.81us-gaap_EarningsPerShareBasic $ (0.29)us-gaap_EarningsPerShareBasic $ (0.44)us-gaap_EarningsPerShareBasic $ 0.17us-gaap_EarningsPerShareBasic $ 0.51us-gaap_EarningsPerShareBasic $ 0.40us-gaap_EarningsPerShareBasic $ 0.06us-gaap_EarningsPerShareBasic $ (0.47)us-gaap_EarningsPerShareBasic $ 1.14us-gaap_EarningsPerShareBasic $ 1.00us-gaap_EarningsPerShareBasic
Diluted earnings (loss) per share (in dollars per share) $ (0.54)us-gaap_EarningsPerShareDiluted $ 0.79us-gaap_EarningsPerShareDiluted $ (0.29)us-gaap_EarningsPerShareDiluted $ (0.44)us-gaap_EarningsPerShareDiluted $ 0.17us-gaap_EarningsPerShareDiluted $ 0.50us-gaap_EarningsPerShareDiluted $ 0.39us-gaap_EarningsPerShareDiluted $ 0.06us-gaap_EarningsPerShareDiluted $ (0.47)us-gaap_EarningsPerShareDiluted $ 1.12us-gaap_EarningsPerShareDiluted $ 0.99us-gaap_EarningsPerShareDiluted
COMPREHENSIVE INCOME (LOSS):                      
Net Income (loss) (27,868,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 41,338,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic (14,737,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic (22,887,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 8,609,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 26,394,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 20,720,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 3,233,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic (24,154,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 58,956,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 51,157,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Proportionate share of other companies foreign currency translation adjustment, net of tax                 (1,129,000)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent 66,000us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent (251,000)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent
Unrealized appreciation (depreciation) on marketable securities, net of tax                 (719,000)us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent (13,000)us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent 316,000us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent
TOTAL COMPREHENSIVE INCOME (LOSS)                 (26,002,000)us-gaap_ComprehensiveIncomeNetOfTax 59,009,000us-gaap_ComprehensiveIncomeNetOfTax 51,222,000us-gaap_ComprehensiveIncomeNetOfTax
Fair Value of Financial Instruments                      
Fair value of long-term debt 1,813,100,000us-gaap_LongTermDebtFairValue       1,509,000,000us-gaap_LongTermDebtFairValue       1,813,100,000us-gaap_LongTermDebtFairValue 1,509,000,000us-gaap_LongTermDebtFairValue  
Carrying amount of long-term debt $ 1,745,811,000us-gaap_LongTermDebt       $ 1,470,568,000us-gaap_LongTermDebt       $ 1,745,811,000us-gaap_LongTermDebt $ 1,470,568,000us-gaap_LongTermDebt  
Segment Reporting                      
Operating segments number                 2us-gaap_NumberOfOperatingSegments    
Number of operating subsidiaries representing operating segments                 2skyw_NumberOfSubsidiariesRepresentingOperatingSegments    
Delta Connection Agreements | ExpressJet                      
Agreements with other airlines                      
Term of agreement                 4 years 1 month 6 days    
Delta Connection Agreements | Sky West Airlines Inc                      
Agreements with other airlines                      
Term of agreement                 4 years 9 months 18 days    
Delta Connection Agreements | CRJ 200 | ExpressJet                      
Agreements with other airlines                      
Number of aircraft under contract                 59us-gaap_NumberOfAircraftOperated
/ us-gaap_AircraftTypeAxis
= skyw_CRJ200Member
/ dei_LegalEntityAxis
= skyw_ExpressJetMember
/ us-gaap_TypeOfArrangementAxis
= skyw_DeltaConnectionAgreementsMember		    
Delta Connection Agreements | CRJ 200 | Sky West Airlines Inc                      
Agreements with other airlines                      
Number of aircraft under contract                 44us-gaap_NumberOfAircraftOperated
/ us-gaap_AircraftTypeAxis
= skyw_CRJ200Member
/ dei_LegalEntityAxis
= skyw_SkyWestAirlinesIncMember
/ us-gaap_TypeOfArrangementAxis
= skyw_DeltaConnectionAgreementsMember		    
Delta Connection Agreements | CRJ 700 | ExpressJet                      
Agreements with other airlines                      
Number of aircraft under contract                 41us-gaap_NumberOfAircraftOperated
/ us-gaap_AircraftTypeAxis
= skyw_CRJ700Member
/ dei_LegalEntityAxis
= skyw_ExpressJetMember
/ us-gaap_TypeOfArrangementAxis
= skyw_DeltaConnectionAgreementsMember		    
Delta Connection Agreements | CRJ 700 | Sky West Airlines Inc                      
Agreements with other airlines                      
Number of aircraft under contract                 19us-gaap_NumberOfAircraftOperated
/ us-gaap_AircraftTypeAxis
= skyw_CRJ700Member
/ dei_LegalEntityAxis
= skyw_SkyWestAirlinesIncMember
/ us-gaap_TypeOfArrangementAxis
= skyw_DeltaConnectionAgreementsMember		    
Delta Connection Agreements | CRJ 900 | ExpressJet                      
Agreements with other airlines                      
Number of aircraft under contract                 28us-gaap_NumberOfAircraftOperated
/ us-gaap_AircraftTypeAxis
= skyw_CRJ900Member
/ dei_LegalEntityAxis
= skyw_ExpressJetMember
/ us-gaap_TypeOfArrangementAxis
= skyw_DeltaConnectionAgreementsMember		    
Delta Connection Agreements | CRJ 900 | Sky West Airlines Inc                      
Agreements with other airlines                      
Number of aircraft under contract                 32us-gaap_NumberOfAircraftOperated
/ us-gaap_AircraftTypeAxis
= skyw_CRJ900Member
/ dei_LegalEntityAxis
= skyw_SkyWestAirlinesIncMember
/ us-gaap_TypeOfArrangementAxis
= skyw_DeltaConnectionAgreementsMember		    
United Express Agreements | ExpressJet                      
Agreements with other airlines                      
Term of agreement                 1 year 10 months 24 days    
United Express Agreements | Sky West Airlines Inc                      
Agreements with other airlines                      
Term of agreement                 3 years 4 months 24 days    
United Express Agreements | CRJ 200 | ExpressJet                      
Agreements with other airlines                      
Number of aircraft under contract                 7us-gaap_NumberOfAircraftOperated
/ us-gaap_AircraftTypeAxis
= skyw_CRJ200Member
/ dei_LegalEntityAxis
= skyw_ExpressJetMember
/ us-gaap_TypeOfArrangementAxis
= skyw_UnitedExpressAgreementsMember		    
United Express Agreements | CRJ 200 | Sky West Airlines Inc                      
Agreements with other airlines                      
Number of aircraft under contract                 61us-gaap_NumberOfAircraftOperated
/ us-gaap_AircraftTypeAxis
= skyw_CRJ200Member
/ dei_LegalEntityAxis
= skyw_SkyWestAirlinesIncMember
/ us-gaap_TypeOfArrangementAxis
= skyw_UnitedExpressAgreementsMember		    
United Express Agreements | CRJ 700 | Sky West Airlines Inc                      
Agreements with other airlines                      
Number of aircraft under contract                 70us-gaap_NumberOfAircraftOperated
/ us-gaap_AircraftTypeAxis
= skyw_CRJ700Member
/ dei_LegalEntityAxis
= skyw_SkyWestAirlinesIncMember
/ us-gaap_TypeOfArrangementAxis
= skyw_UnitedExpressAgreementsMember		    
United Express Agreements | E175 | Sky West Airlines Inc                      
Agreements with other airlines                      
Number of aircraft under contract                 20us-gaap_NumberOfAircraftOperated
/ us-gaap_AircraftTypeAxis
= skyw_E175Member
/ dei_LegalEntityAxis
= skyw_SkyWestAirlinesIncMember
/ us-gaap_TypeOfArrangementAxis
= skyw_UnitedExpressAgreementsMember		    
United Express Agreements | EMB 120 | Sky West Airlines Inc                      
Agreements with other airlines                      
Number of aircraft under contract                 9us-gaap_NumberOfAircraftOperated
/ us-gaap_AircraftTypeAxis
= skyw_EMB120Member
/ dei_LegalEntityAxis
= skyw_SkyWestAirlinesIncMember
/ us-gaap_TypeOfArrangementAxis
= skyw_UnitedExpressAgreementsMember		    
United Express Agreements | EMB 145 | ExpressJet                      
Agreements with other airlines                      
Number of aircraft under contract                 216us-gaap_NumberOfAircraftOperated
/ us-gaap_AircraftTypeAxis
= skyw_EMB145Member
/ dei_LegalEntityAxis
= skyw_ExpressJetMember
/ us-gaap_TypeOfArrangementAxis
= skyw_UnitedExpressAgreementsMember		    
United Express Agreements | EMB 135 | ExpressJet                      
Agreements with other airlines                      
Number of aircraft under contract                 9us-gaap_NumberOfAircraftOperated
/ us-gaap_AircraftTypeAxis
= skyw_EMB135Member
/ dei_LegalEntityAxis
= skyw_ExpressJetMember
/ us-gaap_TypeOfArrangementAxis
= skyw_UnitedExpressAgreementsMember		    
United Express Agreement | Sky West Airlines Inc                      
Agreements with other airlines                      
Notice period for termination of agreement                 120 days    
United Express Agreement | CRJ 200 | Sky West Airlines Inc                      
Agreements with other airlines                      
Number of aircraft under contract                 21us-gaap_NumberOfAircraftOperated
/ us-gaap_AircraftTypeAxis
= skyw_CRJ200Member
/ dei_LegalEntityAxis
= skyw_SkyWestAirlinesIncMember
/ us-gaap_TypeOfArrangementAxis
= skyw_UnitedExpressProrateAgreementMember		    
United Express Agreement | EMB 120 | Sky West Airlines Inc                      
Agreements with other airlines                      
Number of aircraft under contract                 12us-gaap_NumberOfAircraftOperated
/ us-gaap_AircraftTypeAxis
= skyw_EMB120Member
/ dei_LegalEntityAxis
= skyw_SkyWestAirlinesIncMember
/ us-gaap_TypeOfArrangementAxis
= skyw_UnitedExpressProrateAgreementMember		    
Alaska Capacity Purchase Agreement | CRJ 700 | Sky West Airlines Inc                      
Agreements with other airlines                      
Number of aircraft under contract                 9us-gaap_NumberOfAircraftOperated
/ us-gaap_AircraftTypeAxis
= skyw_CRJ700Member
/ dei_LegalEntityAxis
= skyw_SkyWestAirlinesIncMember
/ us-gaap_TypeOfArrangementAxis
= skyw_AlaskaCapacityPurchaseAgreementMember		    
US Airways Express Agreement | CRJ 200 | Sky West Airlines Inc                      
Agreements with other airlines                      
Number of aircraft under contract                 10us-gaap_NumberOfAircraftOperated
/ us-gaap_AircraftTypeAxis
= skyw_CRJ200Member
/ dei_LegalEntityAxis
= skyw_SkyWestAirlinesIncMember
/ us-gaap_TypeOfArrangementAxis
= skyw_USAirwaysExpressAgreementMember		    
US Airways Express Agreement | CRJ 900 | Sky West Airlines Inc                      
Agreements with other airlines                      
Number of aircraft under contract                 4us-gaap_NumberOfAircraftOperated
/ us-gaap_AircraftTypeAxis
= skyw_CRJ900Member
/ dei_LegalEntityAxis
= skyw_SkyWestAirlinesIncMember
/ us-gaap_TypeOfArrangementAxis
= skyw_USAirwaysExpressAgreementMember		    
American Capacity Purchase Agreement | CRJ 200 | ExpressJet                      
Agreements with other airlines                      
Number of aircraft under contract                 11us-gaap_NumberOfAircraftOperated
/ us-gaap_AircraftTypeAxis
= skyw_CRJ200Member
/ dei_LegalEntityAxis
= skyw_ExpressJetMember
/ us-gaap_TypeOfArrangementAxis
= skyw_AmericanCapacityPurchaseAgreementMember		    
American Capacity Purchase Agreement | CRJ 200 | Sky West Airlines Inc                      
Agreements with other airlines                      
Number of aircraft under contract                 12us-gaap_NumberOfAircraftOperated
/ us-gaap_AircraftTypeAxis
= skyw_CRJ200Member
/ dei_LegalEntityAxis
= skyw_SkyWestAirlinesIncMember
/ us-gaap_TypeOfArrangementAxis
= skyw_AmericanCapacityPurchaseAgreementMember		    
American Capacity Prorate Agreement | Sky West Airlines Inc                      
Agreements with other airlines                      
Notice period for termination of agreement                 120 days    
American Capacity Prorate Agreement | CRJ 200 | Sky West Airlines Inc                      
Agreements with other airlines                      
Number of aircraft under contract                 4us-gaap_NumberOfAircraftOperated
/ us-gaap_AircraftTypeAxis
= skyw_CRJ200Member
/ dei_LegalEntityAxis
= skyw_SkyWestAirlinesIncMember
/ us-gaap_TypeOfArrangementAxis
= skyw_AmericanCapacityProrateAgreementMember		    
US Airways Express Prorate Agreement [Member] | Sky West Airlines Inc                      
Agreements with other airlines                      
Notice period for termination of agreement                 120 days    
US Airways Express Prorate Agreement [Member] | CRJ 200 | Sky West Airlines Inc                      
Agreements with other airlines                      
Number of aircraft under contract                 1us-gaap_NumberOfAircraftOperated
/ us-gaap_AircraftTypeAxis
= skyw_CRJ200Member
/ dei_LegalEntityAxis
= skyw_SkyWestAirlinesIncMember
/ us-gaap_TypeOfArrangementAxis
= skyw_USAirwaysExpressProrateAgreementMember		    
Prorate Agreement [Member] | ExpressJet                      
Agreements with other airlines                      
Notice period for termination of agreement                 120 days    
Prorate Agreement [Member] | Sky West Airlines Inc                      
Agreements with other airlines                      
Notice period for termination of agreement                 30 days    
Prorate Agreement [Member] | CRJ 200 | ExpressJet                      
Agreements with other airlines                      
Number of aircraft under contract                 2us-gaap_NumberOfAircraftOperated
/ us-gaap_AircraftTypeAxis
= skyw_CRJ200Member
/ dei_LegalEntityAxis
= skyw_ExpressJetMember
/ us-gaap_TypeOfArrangementAxis
= skyw_ProrateAgreementMember		    
Prorate Agreement [Member] | CRJ 200 | Sky West Airlines Inc                      
Agreements with other airlines                      
Number of aircraft under contract                 10us-gaap_NumberOfAircraftOperated
/ us-gaap_AircraftTypeAxis
= skyw_CRJ200Member
/ dei_LegalEntityAxis
= skyw_SkyWestAirlinesIncMember
/ us-gaap_TypeOfArrangementAxis
= skyw_ProrateAgreementMember		    
Prorate Agreement [Member] | EMB 120 | Sky West Airlines Inc                      
Agreements with other airlines                      
Number of aircraft under contract                 6us-gaap_NumberOfAircraftOperated
/ us-gaap_AircraftTypeAxis
= skyw_EMB120Member
/ dei_LegalEntityAxis
= skyw_SkyWestAirlinesIncMember
/ us-gaap_TypeOfArrangementAxis
= skyw_ProrateAgreementMember