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Cover - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Mar. 04, 2026
Jun. 30, 2025
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2025    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-35186    
Entity Registrant Name Spirit Aviation Holdings, Inc.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 33-3711797    
Entity Address, Address Line One 1731 Radiant Drive    
Entity Address, City or Town Dania Beach    
Entity Address, State or Province FL    
Entity Address, Postal Zip Code 33004    
City Area Code 954    
Local Phone Number 447-7920    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers Yes    
Entity Current Reporting Status No    
Entity Interactive Data Current Yes    
Entity Filer Category Accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 129
Entity Common Stock, Shares Outstanding   28,320,815  
Documents Incorporated by Reference
Portions of the registrant's Proxy Statement for the registrant's 2026 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, 2025.
    
Entity Central Index Key 0001498710    
Amendment Flag false    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2025    
Financial Designation, Predecessor and Successor [Fixed List] Successor