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Earnings per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Basic:        
Net income attributable to Allegiant Travel Company (in Dollars) $ 95,027 $ (93,103) $ 101,896 $ (126,113)
Less: Net income allocated to participating securities (in Dollars) (1,285) 0 (1,451) (236)
Net income attributable to common stock (in Dollars) $ 93,742 $ (93,103) $ 100,445 $ (126,349)
Net income per share, basic (in Dollars per share) $ 5.49 $ (5.85) $ 6.04 $ (7.93)
Weighted-average shares outstanding 17,064 15,902 16,618 15,927
Dilutive effect of stock options, restricted stock and stock-settled stock appreciation rights 123 0 128 0
WeightedAverageNumberofDilutedSharesOutstandingTreasuryStockMethod 17,187 15,902 16,746 15,927
Participating securities excluded under two-class method (114) 0 (114) 0
Diluted 17,073 15,902 16,632 15,927
Undistributed Earnings (Loss) Allocated to Participating Securities, Diluted $ (1,284) $ 0 $ (1,449) $ (236)
Net Income (Loss) Available to Common Stockholders, Diluted $ 93,743 $ (93,103) $ 100,447 $ (126,349)
Diluted earnings per share $ 5.49 $ (5.85) $ 6.04 $ (7.93)