Segment Reporting (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) segment	Jun. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Segment Reporting
Number of reporting segments | segment			2
Operating revenues	$ 799,085	$ 656,990	$ 1,534,237	$ 1,191,545
Operating expense	710,483	541,967	1,393,587	995,680
Depreciation and amortization expense	97,249	109,895	199,994	219,492
Interest expense	30,433	33,940	59,025	65,294
Segment profit	58,169	81,083	81,625	130,571
Total assets (as of June 30)	7,336,647	6,991,763	7,336,647	6,991,763	$ 7,125,947
Capital expenditures (including non-cash)	201,178	26,439	328,763	83,947
SkyWest Airlines
Segment Reporting
Operating revenues	664,203	527,595	1,267,252	934,045
Operating expense	636,245	477,188	1,257,273	865,058
Depreciation and amortization expense	44,982	53,151	92,676	103,477
Interest expense	2,650	6,219	4,439	9,348
Segment profit	25,308	44,188	5,540	59,639
Total assets (as of June 30)	3,011,236	3,089,404	3,011,236	3,089,404
Capital expenditures (including non-cash)	20,010	21,822	52,706	57,028
SkyWest Leasing
Segment Reporting
Operating revenues	134,882	129,395	266,985	257,500
Operating expense	74,238	64,779	136,314	130,622
Depreciation and amortization expense	52,267	56,744	107,318	116,015
Interest expense	27,783	27,721	54,586	55,946
Segment profit	32,861	36,895	76,085	70,932
Total assets (as of June 30)	4,325,411	3,902,359	4,325,411	3,902,359
Capital expenditures (including non-cash)	$ 181,168	$ 4,617	$ 276,057	$ 26,919