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Earnings per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Basic:    
Net income attributable to Allegiant Travel Company (in Dollars) $ 6,869 $ (33,009)
Less: Net income allocated to participating securities (in Dollars) (103) (236)
Net income attributable to common stock (in Dollars) $ 6,766 $ (33,245)
Net income per share, basic (in Dollars per share) $ 0.42 $ (2.08)
Weighted-average shares outstanding 16,167 15,952
Undistributed Earnings (Loss) Allocated to Participating Securities, Diluted $ (103) $ (236)
Net Income (Loss) Available to Common Stockholders, Diluted $ 6,766 $ (33,245)
Diluted earnings per share $ 0.42 $ (2.08)