Segment Reporting (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($) segment	Jun. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)
Segment Reporting
Number of reporting segments | segment			2
Operating revenues	$ 1,035,227	$ 867,118	$ 1,983,682	$ 1,670,732
Salaries, wages and benefits	390,243	355,005	767,554	706,004
Aircraft maintenance, materials and repairs	238,885	183,267	447,985	328,682
Depreciation and amortization	90,150	96,814	179,596	192,684
Interest expense	26,566	28,966	53,684	58,795
Operating expense	865,099	747,478	1,674,177	1,451,586
Other segment items	$ 126,267	$ 100,900	$ 251,029	$ 202,226
Segment Reporting, Other Segment Item, Composition, Description	Other segment items include aircraft fuel; airport related expenses; other operating expenses consisting primarily of property taxes, hull and liability insurance, simulator costs, crew per diem and crew hotel costs; aircraft rentals; interest income and other income (expense), net.	Other segment items include aircraft fuel; airport related expenses; other operating expenses consisting primarily of property taxes, hull and liability insurance, simulator costs, crew per diem and crew hotel costs; aircraft rentals; interest income and other income (expense), net.	Other segment items include aircraft fuel; airport related expenses; other operating expenses consisting primarily of property taxes, hull and liability insurance, simulator costs, crew per diem and crew hotel costs; aircraft rentals; interest income and other income (expense), net.	Other segment items include aircraft fuel; airport related expenses; other operating expenses consisting primarily of property taxes, hull and liability insurance, simulator costs, crew per diem and crew hotel costs; aircraft rentals; interest income and other income (expense), net.
Segment profit	$ 163,116	$ 102,166	$ 283,834	$ 182,341
Total assets	7,174,083	6,962,439	7,174,083	6,962,439	$ 7,139,867
Capital expenditures (including non-cash)	139,473	40,907	258,389	85,257
SkyWest Airlines and SWC
Segment Reporting
Operating revenues	869,336	711,784	1,670,987	1,358,593
Salaries, wages and benefits	389,578	354,340	766,224	704,674
Aircraft maintenance, materials and repairs	216,609	175,562	418,085	316,652
Depreciation and amortization	39,005	37,004	76,753	73,112
Interest expense	3,187	3,255	6,168	6,731
Other segment items	130,696	109,646	259,226	220,451
Segment profit	90,261	31,977	144,531	36,973
Total assets	3,086,209	2,644,446	3,086,209	2,644,446
Capital expenditures (including non-cash)	74,315	40,907	193,231	85,257
SkyWest Leasing
Segment Reporting
Operating revenues	165,891	155,334	312,695	312,139
Salaries, wages and benefits	665	665	1,330	1,330
Aircraft maintenance, materials and repairs	22,276	7,705	29,900	12,030
Depreciation and amortization	51,145	59,810	102,843	119,572
Interest expense	23,379	25,711	47,516	52,064
Other segment items	(4,429)	(8,746)	(8,197)	(18,225)
Segment profit	72,855	70,189	139,303	145,368
Total assets	4,087,874	$ 4,317,993	4,087,874	$ 4,317,993
Capital expenditures (including non-cash)	$ 65,158		$ 65,158