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Earnings (Loss) per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Basic:    
Net income attributable to Allegiant Travel Company (in Dollars) $ (7,881) $ 6,869
Less: Net income allocated to participating securities (in Dollars) 0 (103)
Net income attributable to common stock (in Dollars) $ (7,881) $ 6,766
Net income per share, basic (in Dollars per share) $ (0.44) $ 0.42
Weighted-average shares outstanding 17,954 16,167
Undistributed Earnings (Loss) Allocated to Participating Securities, Diluted $ 0 $ (103)
Net Income (Loss) Available to Common Stockholders, Diluted $ (7,881) $ 6,766
Diluted earnings per share $ (0.44) $ 0.42