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allegiant Exhibit 99.1 ALLEGIANT TRAVEL COMPANY SECOND QUARTER 2021 FINANCIAL RESULTS Second quarter 2021 GAAP fully diluted earnings per share of $ 5.49 Second quarter 2021 consolidated fully diluted earnings per share , excluding COVID related special charges and net benefit from the payroll support programs of $ 3.46 ( 1 ) ( 2 ) LAS VEGAS . July 28 , 2021 — Allegiant Travel Company ( NASDAQ : ALGT ) today reported the following financial results for the second quarter 2021 , as well as comparisons to the prior years : Consolidated ( unaudited ) ( in millions , except per share amounts ) 2021 Three Months Ended June 30 , 2020 Percent Change 2019 YOY YO2Y Total operating revenue $ 472.4 $ 133.3 $ 491.8 254.3 ( 3.9 ) Total operating expense 333.6 246.6 383.7 35.3 ( 13.1 ) Operating income ( loss ) 138.9 ( 113.3 ) 108.1 222.6 28.4 Income ( loss ) before income taxes 122.6 ( 146.4 ) 91.8 183.7 33.5 Net income ( loss ) 95.0 ( 93.1 ) 70.5 202.1 34.7 Diluted earnings ( loss ) per share $ 5.49 $ ( 5.85 ) $ 4.33 193.8 26.8 ( unaudited ) ( in millions , except per share amounts ) 2021 Six Months Ended June 30 , 2020 Percent Change 2019 YoY YO2Y Total operating revenue $ 751.6 $ 542.5 $ 943.4 38.5 ( 20.3 ) Total operating expense 588.1 766.8 744.2 ( 23.3 ) ( 21.0 ) Operating income ( loss ) 163.5 ( 224.3 ) 199.2 172.9 ( 17.9 ) Income ( loss ) before income taxes 131.2 ( 277.1 ) 165.7 147.4 ( 20.8 ) Net income ( loss ) 101.9 ( 126.1 ) 127.7 180.8 ( 20.2 ) Diluted earnings ( loss ) per share $ 6.04 $ ( 7.93 ) $ 7.84 176.2 ( 23.0 ) Consolidated - adjusted Three Months Ended June 30 , Percent Change ( unaudited ) ( in millions , except per share amounts ) 2021 2020 2019 YOY Yo2Y Adjusted operating expense ( 1 ) ( 2 ) $ 378.6 $ 239.9 $ 383.7 57.8 ( 1.3 ) Adjusted operating income ( loss ) ( 1 ) ( 2 ) 93.9 ( 106.6 ) 108.1 188.1 ( 13.1 ) Adjusted income ( loss ) before income taxes ( 1 ) ( 2 ) 77.6 ( 119.9 ) 91.8 164.7 ( 15.5 ) Adjusted net income ( loss ) ( 1 ) ( 2 ) 60.0 ( 94.7 ) 70.5 163.4 ( 14.9 ) Adjusted diluted earnings ( loss ) per share ( 1 ) ( 2 ) $ 3.46 $ ( 5.96 ) $ 4.33 158.1 ( 20.1 )