Cover - shares	3 Months Ended
	Mar. 31, 2020	Apr. 30, 2020
Cover [Abstract]
Document Type	10-Q/A
Entity Incorporation, State or Country Code	DE
City Area Code	(206)
Local Phone Number	392-5040
Trading Symbol	ALK
Entity Address, Address Line One	19300 International Boulevard,
Entity Address, City or Town	Seattle,
Entity Address, State or Province	WA
Entity Address, Postal Zip Code	98188
Entity File Number	1-8957
Entity Registrant Name	ALASKA AIR GROUP, INC.
Security Exchange Name	NYSE
Title of 12(b) Security	Common stock, $0.01 par value
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		122,585,372
Document Period End Date	Mar. 31, 2020
Amendment Flag	true
Entity Central Index Key	0000766421
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--12-31
Entity Emerging Growth Company	false
Entity Small Business	false
Document Quarterly Report	true
Entity Tax Identification Number	91-1292054
Document Transition Report	false