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Summary of Significant Accounting Policies Basis - Narrative (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Jul. 03, 2025
USD ($)
Aug. 31, 2021
point
Jun. 30, 2025
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2025
USD ($)
shares
Dec. 31, 2024
USD ($)
shares
Dec. 31, 2023
USD ($)
shares
May 31, 2023
pay
Property, Plant and Equipment [Line Items]                
Inventory Valuation Reserves       $ 12,600 $ 14,700 $ 12,600    
Accounts Receivable, before Allowance for Credit Loss, Noncurrent       15,100 10,500 15,100    
Capitalized Computer Software, Net       149,700 139,700 149,700    
Capitalized Computer Software, Amortization         19,200 18,800 $ 12,400  
Impairment of Long-Lived Assets to be Disposed of     $ 100,400          
Deferred Credits and Other Liabilities       16,800 40,200 16,800    
Accounts Receivable, Allowance for Credit Loss       17,000 7,100 17,000    
Accrued Retention Bonus, Current Payment Percentage               35.00%
Accrued Retention Bonus, Minimum Pay Credit Hours Per Month | pay               85
Accrued Retention Bonus, Employee Exception Percentage               82.00%
Accrued pilot retention bonus       146,129 235,887 146,129    
Advertising Expense         $ 29,100 $ 32,000 41,000  
Preopening Expense             $ 26,500  
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares         290,873 452,560 81,748  
Allways Rewards Loyalty Program                
Property, Plant and Equipment [Line Items]                
Number Of Points Earned For Every Dollar Spent | point   1            
Number Of Points Earned For Every Dollar Spent Over Five Hundred Dollars | point   2            
Sunseeker Resort (1)                
Property, Plant and Equipment [Line Items]                
Sunseeker impairment $ 100,400     $ 321,800 $ 98,300 $ 321,800    
A320 Series Engine                
Property, Plant and Equipment [Line Items]                
Deferred Costs for Heavy Maintenance         45,900 76,800    
Amortization of Other Deferred Charges         $ 64,400 $ 65,800 $ 55,500  
Minimum | Computer hardware and software                
Property, Plant and Equipment [Line Items]                
Property, Plant and Equipment, Useful Life         3 years      
Maximum | Computer hardware and software                
Property, Plant and Equipment [Line Items]                
Property, Plant and Equipment, Useful Life         15 years      
Allegiant Travel Company                
Property, Plant and Equipment [Line Items]                
Equity Method Investment, Ownership Percentage         50.00%