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Cover - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2023
Feb. 01, 2024
Jun. 30, 2023
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2023    
Current Fiscal Year End Date --12-31    
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    
Title of 12(b) Security Common Stock, $0.0001 par value    
Trading Symbol SAVE    
Security Exchange Name NYSE    
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    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 1.9
Entity Common Stock, Shares Outstanding   109,477,999  
Documents Incorporated by Reference
Portions of the registrant's Proxy Statement for the registrant's 2024 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, 2023.
    
Entity Central Index Key 0001498710    
Amendment Flag false    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2023