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Segment Reporting (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
segment
Sep. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Segment Reporting          
Number of reporting segments | segment     2    
Operating revenues $ 1,050,029 $ 912,786 $ 3,033,711 $ 2,583,518  
Salaries, wages and benefits 391,634 377,435 1,159,188 1,083,439  
Aircraft maintenance, materials and repairs 247,978 181,652 695,963 510,334  
Depreciation and amortization 92,474 96,662 272,070 289,346  
Interest expense 25,611 27,808 79,295 86,603  
Other segment expense (income) items $ 135,163 $ 113,033 $ 386,192 $ 315,259  
Segment Reporting, Other Segment Item, Composition, Description Other segment items include aircraft fuel; airport related expenses; other operating expenses consisting primarily of property taxes, hull and liability insurance, simulator costs, crew per diem and crew hotel costs; aircraft rentals; interest income and other income (expense), net. Other segment items include aircraft fuel; airport related expenses; other operating expenses consisting primarily of property taxes, hull and liability insurance, simulator costs, crew per diem and crew hotel costs; aircraft rentals; interest income and other income (expense), net. Other segment items include aircraft fuel; airport related expenses; other operating expenses consisting primarily of property taxes, hull and liability insurance, simulator costs, crew per diem and crew hotel costs; aircraft rentals; interest income and other income (expense), net. Other segment items include aircraft fuel; airport related expenses; other operating expenses consisting primarily of property taxes, hull and liability insurance, simulator costs, crew per diem and crew hotel costs; aircraft rentals; interest income and other income (expense), net.  
Segment profit $ 157,169 $ 116,196 $ 441,003 $ 298,537  
Total assets 7,214,196 6,956,600 7,214,196 6,956,600 $ 7,139,867
Capital expenditures (including non-cash) 55,395 84,287 313,784 169,544  
SkyWest Airlines and SWC          
Segment Reporting          
Operating revenues 892,618 758,425 2,563,605 2,117,018  
Salaries, wages and benefits 390,969 376,770 1,157,193 1,081,444  
Aircraft maintenance, materials and repairs 236,745 173,745 654,830 490,397  
Depreciation and amortization 40,778 37,105 117,531 110,217  
Interest expense 2,662 2,864 8,830 9,595  
Other segment expense (income) items 144,963 123,356 404,189 343,807  
Segment profit 76,501 44,585 221,032 81,558  
Total assets 3,160,752 2,673,084 3,160,752 2,673,084  
Capital expenditures (including non-cash) 39,836 59,331 233,067 144,588  
SkyWest Leasing          
Segment Reporting          
Operating revenues 157,411 154,361 470,106 466,500  
Salaries, wages and benefits 665 665 1,995 1,995  
Aircraft maintenance, materials and repairs 11,233 7,907 41,133 19,937  
Depreciation and amortization 51,696 59,557 154,539 179,129  
Interest expense 22,949 24,944 70,465 77,008  
Other segment expense (income) items (9,800) (10,323) (17,997) (28,548)  
Segment profit 80,668 71,611 219,971 216,979  
Total assets 4,053,444 4,283,516 4,053,444 4,283,516  
Capital expenditures (including non-cash) $ 15,559 $ 24,956 $ 80,717 $ 24,956