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Cover - USD ($) $ in Billions	12 Months Ended
Cover - USD ($) $ in Billions	Dec. 31, 2019	Jan. 28, 2020	Jun. 30, 2019
Entity Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2019
Document Transition Report	false
Entity File Number	001-35186
Entity Registrant Name	Spirit Airlines, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	38-1747023
Entity Address, Address Line One	2800 Executive Way
Entity Address, City or Town	Miramar
Entity Address, State or Province	FL
Entity Address, Postal Zip Code	33025
City Area Code	954
Local Phone Number	447-7920
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 3.2
Entity Common Stock, Shares Outstanding (in shares)		68,455,011
Documents Incorporated by Reference	Portions of the registrant's Proxy Statement for the registrant's 2020 Annual Meeting of Stockholders are incorporated by reference into Part III of this Form 10-K to the extent stated herein. The Proxy Statement will be filed within 120 days of the registrant's fiscal year ended December 31, 2019.
Entity Central Index Key	0001498710
Amendment Flag	false
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2019
Current Fiscal Year End Date	--12-31
Voting Common Stock, $0.0001 par value
Entity Information [Line Items]
Title of 12(b) Security	Voting Common Stock, $0.0001 par value
Security Exchange Name	NYSE
Trading Symbol	SAVE
Non-Voting Common Stock, $0.0001 par value
Entity Information [Line Items]
Title of 12(b) Security	Non-Voting Common Stock, $0.0001 par value
Security Exchange Name	NYSE
Trading Symbol	SAVE