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Segments - Schedule of Segment Reporting Information, by Segment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Segment Reporting Information [Line Items]      
Passenger $ 2,324,397 $ 2,137,762 $ 1,578,436
Third party products 112,579 100,959 86,487
Fixed fee contract 68,548 60,937 41,184
Other 4,333 2,171 1,803
Operating income (loss) 220,981 91,646 263,075
Interest income (46,615) (16,469) (1,814)
Interest expense 152,380 108,831 68,403
Capitalized interest (45,132) (12,640)  
Depreciation and amortization 223,130 197,542 181,035
Capital expenditures 889,353 763,662 360,611
Assets 4,869,410 4,511,297  
Allegiant Air      
Segment Reporting Information [Line Items]      
Passenger 2,324,397 2,137,762 1,578,436
Third party products 112,579 100,959 86,487
Fixed fee contract 68,548 60,937 41,184
Other 1,444 2,169 1,803
Operating income (loss) 251,468 136,968 271,073
Interest income (46,615) (16,469) (1,814)
Interest expense 130,512 92,785 66,585
Capitalized interest (21,838) (4,308)  
Depreciation and amortization 220,915 197,433 180,923
Capital expenditures 568,309 475,254 309,982
Assets 4,213,288 4,047,134  
Sunseeker Resort      
Segment Reporting Information [Line Items]      
Passenger 0 0 0
Third party products 0 0 0
Fixed fee contract 0 0 0
Other 2,889 2 0
Operating income (loss) (30,487) (45,322) (7,998)
Interest income 0 0 0
Interest expense 21,868 16,046 1,818
Capitalized interest (23,294) (8,332)  
Depreciation and amortization 2,215 109 112
Capital expenditures 321,044 288,408 $ 50,629
Assets $ 656,122 $ 464,163