Name:	sncy_IncomeTaxesReceivableAgreementNonCurrentLiability
Namespace Prefix:	sncy_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount of increase (decrease) to the Tax Receivable Agreement liability.

No definition available.

Name:	sncy_IncreaseDecreaseToTaxReceivableAgreementLiability
Namespace Prefix:	sncy_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Percentage of amount in cash savings if any, in U.S. federal and state income tax that the Company actually realizes as a result of the utilization of the Company's tax attributes existing at the time of the Offering, which the pre IPO Shareholders has the right to receive payment.

No definition available.

Name:	sncy_PercentageOfCashSavingsInFederalAndStateIncomeTaxesThatThePreIPOStockholdersRightToReceive
Namespace Prefix:	sncy_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

The percentage of benefit on cash savings retained by the company under tax receivable agreement.

No definition available.

Name:	sncy_TaxReceivableAgreementPercentageOfBenefitOnCashSavingsRetainedByCompany
Namespace Prefix:	sncy_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319

Name:	us-gaap_EffectiveIncomeTaxRateContinuingOperations
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.