Segment Reporting (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2022 USD ($) segment	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($)
Segment Reporting
Number of reporting segments | segment	2
Operating revenues	$ 735,152	$ 534,555
Operating expense	683,104	453,713
Depreciation and amortization expense	102,745	109,597
Interest expense	28,592	31,354
Segment profit (loss)	23,456	49,488
Total assets (as of March 31)	7,148,958	6,894,685	$ 7,125,947
Capital expenditures (including non-cash)	127,585	57,508
SkyWest Airlines
Segment Reporting
Operating revenues	603,048	406,450
Operating expense	621,028	387,870
Depreciation and amortization expense	47,694	50,326
Interest expense	1,789	3,129
Segment profit (loss)	(19,769)	15,451
Total assets (as of March 31)	2,953,902	2,924,598
Capital expenditures (including non-cash)	32,696	35,206
SkyWest Leasing
Segment Reporting
Operating revenues	132,104	128,105
Operating expense	62,076	65,843
Depreciation and amortization expense	55,051	59,271
Interest expense	26,803	28,225
Segment profit (loss)	43,225	34,037
Total assets (as of March 31)	4,195,056	3,970,087
Capital expenditures (including non-cash)	$ 94,889	$ 22,302