Segment Reporting (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) segment	Sep. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)
Segment Reporting
Number of reporting segments | segment			2
Operating revenues	$ 912,786	$ 766,171	$ 2,583,518	$ 2,183,645
Operating expense	781,351	716,880	2,232,937	2,107,198
Depreciation and amortization expense	96,662	96,560	289,346	287,878
Interest expense	27,808	32,543	86,603	99,881
Segment profit	103,627	16,748	263,978	(23,434)
Total assets	6,956,600	7,059,118	6,956,600	7,059,118	$ 7,026,293
Capital expenditures (including non-cash)	84,287	48,252	169,544	182,192
SkyWest Airlines and SWC
Segment Reporting
Operating revenues	758,425	626,780	2,117,018	1,781,429
Operating expense	712,650	652,599	2,032,115	1,910,481
Depreciation and amortization expense	37,105	37,320	110,217	113,544
Interest expense	2,864	4,450	9,595	13,207
Segment profit	42,911	(30,269)	75,308	(142,259)
Total assets	2,673,084	2,557,850	2,673,084	2,557,850
Capital expenditures (including non-cash)	59,331	33,436	144,588	80,156
SkyWest Leasing
Segment Reporting
Operating revenues	154,361	139,391	466,500	402,216
Operating expense	68,701	64,281	200,822	196,717
Depreciation and amortization expense	59,557	59,240	179,129	174,334
Interest expense	24,944	28,093	77,008	86,674
Segment profit	60,716	47,017	188,670	118,825
Total assets	4,283,516	4,501,268	4,283,516	4,501,268
Capital expenditures (including non-cash)	$ 24,956	$ 14,816	$ 24,956	$ 102,036