Segment Reporting (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) segment	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)
Segment Reporting
Number of reporting segments | segment			2
Operating revenues	$ 766,171	$ 789,443	$ 2,183,645	$ 2,323,680
Operating expense	716,880	713,867	2,107,198	2,107,454
Depreciation and amortization expense	96,560	97,433	287,878	297,427
Interest expense	32,543	33,283	99,881	92,308
Segment profit (loss)	16,748	42,293	(23,434)	123,918
Total assets	7,059,118	7,454,204	7,059,118	7,454,204	$ 7,414,553
Capital expenditures (including non-cash)	48,252	221,086	182,192	549,849
SkyWest Airlines and SWC
Segment Reporting
Operating revenues	626,780	651,494	1,781,429	1,918,746
Operating expense	652,599	649,466	1,910,481	1,906,739
Depreciation and amortization expense	37,320	43,787	113,544	136,463
Interest expense	4,450	4,067	13,207	8,506
Segment profit (loss)	(30,269)	(2,039)	(142,259)	3,501
Total assets	2,557,850	2,973,223	2,557,850	2,973,223
Capital expenditures (including non-cash)	33,436	12,419	80,156	65,125
SkyWest Leasing
Segment Reporting
Operating revenues	139,391	137,949	402,216	404,934
Operating expense	64,281	64,401	196,717	200,715
Depreciation and amortization expense	59,240	53,646	174,334	160,964
Interest expense	28,093	29,216	86,674	83,802
Segment profit (loss)	47,017	44,332	118,825	120,417
Total assets	4,501,268	4,480,981	4,501,268	4,480,981
Capital expenditures (including non-cash)	$ 14,816	$ 208,667	$ 102,036	$ 484,724