Segment Reporting (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) segment	Jun. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)
Segment Reporting
Number of reporting segments | segment			2
Operating revenues	$ 725,643	$ 799,085	$ 1,417,474	$ 1,534,237
Operating expense	693,783	710,483	1,390,318	1,393,587
Depreciation and amortization expense	97,169	97,249	191,318	199,994
Interest expense	33,718	30,433	67,338	59,025
Segment profit (loss)	(1,858)	58,169	(40,182)	81,625
Total assets	7,115,774	7,336,647	7,115,774	7,336,647	$ 7,414,553
Capital expenditures (including non-cash)	26,019	201,178	133,940	328,763
SkyWest Airlines and Charter
Segment Reporting
Operating revenues	586,476	664,203	1,154,649	1,267,252
Operating expense	624,490	636,245	1,257,882	1,257,273
Depreciation and amortization expense	37,966	44,982	76,224	92,676
Interest expense	4,695	2,650	8,757	4,439
Segment profit (loss)	(42,709)	25,308	(111,990)	5,540
Total assets	2,570,050	3,011,236	2,570,050	3,011,236
Capital expenditures (including non-cash)	25,609	20,010	46,720	52,706
SkyWest Leasing
Segment Reporting
Operating revenues	139,167	134,882	262,825	266,985
Operating expense	69,293	74,238	132,436	136,314
Depreciation and amortization expense	59,203	52,267	115,094	107,318
Interest expense	29,023	27,783	58,581	54,586
Segment profit (loss)	40,851	32,861	71,808	76,085
Total assets	4,545,724	4,325,411	4,545,724	4,325,411
Capital expenditures (including non-cash)	$ 410	$ 181,168	$ 87,220	$ 276,057