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Segments - Schedule of Segment Reporting Information, by Segment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Segment Reporting Information [Line Items]      
Revenues $ 2,606,579 $ 2,512,589 $ 2,509,857
Labor and Related Expense 833,017 819,843 687,803
Aircraft Fuel 639,731 627,755 695,871
Station operations 297,549 272,843 256,560
Depreciation, Depletion and Amortization, Nonproduction 249,185 258,251 223,130
Selling and Marketing Expense 99,443 106,340 114,616
Aircraft Maintenance, Materials, and Repairs 149,938 125,430 123,802
Aircraft Lease Rental 36,488 23,573 24,948
Other Cost and Expense, Operating 126,356 150,399 133,501
Total special charges 137,705 368,131 28,645
Total operating expenses 2,569,412 2,752,565 2,288,876
Operating Income (Loss) 37,167 (239,976) 220,981
Interest Income (Expense), Operating (41,697) (44,012) (46,615)
Interest expense 150,235 156,443 153,186
Interest Costs Capitalized (17,604) (45,385) (45,132)
Other Nonoperating Expense 1,107 1,428 491
INCOME (LOSS) BEFORE INCOME TAXES (54,874) (308,450) 159,051
Payments to Acquire Productive Assets 408,247 264,301 889,353
Assets 4,209,401 4,429,853 4,856,667
Allegiant Air      
Segment Reporting Information [Line Items]      
Revenues 2,545,899 2,440,839 2,506,976
Labor and Related Expense 805,432 770,667 672,459
Aircraft Fuel 639,731 627,755 695,871
Station operations 297,549 272,843 256,560
Depreciation, Depletion and Amortization, Nonproduction 242,026 231,789 220,915
Selling and Marketing Expense 95,053 99,269 108,453
Aircraft Maintenance, Materials, and Repairs 149,938 125,430 123,802
Aircraft Lease Rental 36,488 23,573 24,948
Other Cost and Expense, Operating 92,273 102,007 117,400
Total special charges 43,539 45,307 35,091
Total operating expenses 2,402,029 2,298,640 2,255,499
Operating Income (Loss) 143,870 142,199 251,477
Interest Income (Expense), Operating (41,697) (44,012) (46,615)
Interest expense 126,769 135,584 131,318
Interest Costs Capitalized (17,604) (45,059) (21,838)
Other Nonoperating Expense 1,107 1,428 491
INCOME (LOSS) BEFORE INCOME TAXES 75,295 94,258 188,121
Payments to Acquire Productive Assets 406,805 244,802 568,309
Assets 4,209,401 4,116,289 4,200,545
Sunseeker Resort (1)      
Segment Reporting Information [Line Items]      
Revenues 60,680 71,750 2,881
Labor and Related Expense 27,585 49,176 15,344
Aircraft Fuel 0 0 0
Station operations 0 0 0
Depreciation, Depletion and Amortization, Nonproduction 7,159 26,462 2,215
Selling and Marketing Expense 4,390 7,071 6,163
Aircraft Maintenance, Materials, and Repairs 0 0 0
Aircraft Lease Rental 0 0 0
Other Cost and Expense, Operating 34,083 48,392 16,101
Total special charges 94,166 322,824 (6,446)
Total operating expenses 167,383 453,925 33,377
Operating Income (Loss) (106,703) (382,175) (30,496)
Interest Income (Expense), Operating 0 0 0
Interest expense 23,466 20,859 21,868
Interest Costs Capitalized 0 (326) (23,294)
Other Nonoperating Expense 0 0 0
INCOME (LOSS) BEFORE INCOME TAXES (130,169) (402,708) (29,070)
Payments to Acquire Productive Assets 1,442 19,499 321,044
Assets $ 0 $ 313,564 $ 656,122