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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, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Basic:        
Net income attributable to Allegiant Travel Company (in Dollars) $ (29,143) $ 43,929 $ (155,255) $ 171,596
Less: Net income allocated to participating securities (in Dollars) 0 (578) (236) (2,441)
Net income attributable to common stock (in Dollars) $ (29,143) $ 43,351 $ (155,491) $ 169,155
Net income per share, basic (in Dollars per share) $ (1.82) $ 2.70 $ (9.75) $ 10.55
Weighted-average shares outstanding 16,006 16,037 15,953 16,037
Undistributed Earnings (Loss) Allocated to Participating Securities, Diluted $ 0 $ (578) $ (236) $ (2,440)
Net Income (Loss) Available to Common Stockholders, Diluted $ (29,143) $ 43,351 $ (155,491) $ 169,156
Diluted earnings per share $ (1.82) $ 2.70 $ (9.75) $ 10.54