Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2023	Feb. 09, 2024	Jun. 30, 2023
Document and Entity Information
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2023
Document Transition Report	false
Entity File Number	0-14719
Entity Registrant Name	SKYWEST INC
Entity Incorporation, State or Country Code	UT
Entity Tax Identification Number	87-0292166
Entity Address, Address Line One	444 South River Road
Entity Address, City or Town	St. George
Entity Address, State or Province	UT
Entity Address, Postal Zip Code	84790
City Area Code	435
Local Phone Number	634-3000
Title of 12(b) Security	Common Stock, No Par Value
Trading Symbol	SKYW
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	false
Entity Public Float			$ 1,725,423,470
Entity Common Stock, Shares Outstanding		40,229,334
Auditor Name	Ernst & Young LLP
Auditor Firm ID	42
Auditor Location	Salt Lake City, Utah
Entity Central Index Key	0000793733
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	FY
Amendment Flag	false