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Earnings per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Basic:    
Net income attributable to Allegiant Travel Company (in Dollars) $ (33,009) $ 57,124
Less: Net income allocated to participating securities (in Dollars) (236) (799)
Net income attributable to common stock (in Dollars) $ (33,245) $ 56,325
Net income per share, basic (in Dollars per share) $ (2.08) $ 3.52
Weighted-average shares outstanding 15,952,000 16,011,000
Undistributed Earnings (Loss) Allocated to Participating Securities, Diluted $ (236) $ (798)
Net Income (Loss) Available to Common Stockholders, Diluted $ (33,245) $ 56,326
Diluted earnings per share $ (2.08) $ 3.52
Weighted Average Number of Shares Outstanding, Diluted 15,952,000 16,013,000
Dilutive effect of stock options, restricted stock and stock-settled stock appreciation rights 62,000 31,000
Adjusted weighted-average shares outstanding under treasury stock method 16,014,000 16,042,000
Participating securities excluded under two-class method (62,000) (29,000)
Two-Class Method, Weighted Average Number of Shares Outstanding, Diluted 15,952,000 16,013,000