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Segments - Schedule of Segment Reporting Information, by Segment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Segment Reporting Information [Line Items]      
Passenger $ 2,137,762 $ 1,578,436 $ 902,187
Third party products 100,959 86,487 46,482
Fixed fee contract 60,937 41,184 26,865
Other 2,171 1,803 14,539
Operating income (loss) 91,646 263,075 (280,985)
Interest expense, net (1) 79,722 66,347 50,917
Depreciation and amortization 197,542 181,035 176,267
Capital expenditures 763,662 360,611 308,350
Assets 4,511,297 3,991,073  
Allegiant Air      
Segment Reporting Information [Line Items]      
Passenger 2,137,762 1,578,436 902,187
Third party products 100,959 86,487 46,482
Fixed fee contract 60,937 41,184 26,865
Other 2,169 1,803 13,889
Operating income (loss) 136,968 271,073 (135,264)
Interest expense, net (1) 72,008 64,529 50,355
Depreciation and amortization 197,433 180,923 175,652
Capital expenditures 475,254 309,982 263,190
Assets 4,047,134 3,872,041  
Sunseeker Resorts      
Segment Reporting Information [Line Items]      
Other 2 0 650
Operating income (loss) (45,322) (7,998) (145,721)
Interest expense, net (1) 7,714 1,818 562
Depreciation and amortization 109 112 615
Capital expenditures 288,408 50,629 $ 45,160
Assets $ 464,163 $ 119,032