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Earnings per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Basic:        
Net income attributable to Allegiant Travel Company (in Dollars) $ 39,254 $ (29,143) $ 141,150 $ (155,255)
Less: Net income allocated to participating securities (in Dollars) (573) 0 (2,028) (236)
Net income attributable to common stock (in Dollars) $ 38,681 $ (29,143) $ 139,122 $ (155,491)
Net income per share, basic (in Dollars per share) $ 2.18 $ (1.82) $ 8.18 $ (9.75)
Weighted-average shares outstanding 17,766 16,006 17,005 15,953
Dilutive effect of stock options, restricted stock and stock-settled stock appreciation rights 103 0 121 0
WeightedAverageNumberofDilutedSharesOutstandingTreasuryStockMethod 17,869 16,006 17,126 15,953
Participating securities excluded under two-class method (102) 0 (111) 0
Diluted 17,767 16,006 17,015 15,953
Undistributed Earnings (Loss) Allocated to Participating Securities, Diluted $ (573) $ 0 $ (2,027) $ (236)
Net Income (Loss) Available to Common Stockholders, Diluted $ 38,681 $ (29,143) $ 139,123 $ (155,491)
Diluted earnings per share $ 2.18 $ (1.82) $ 8.18 $ (9.75)