DOCUMENT AND ENTITY INFORMATION	3 Months Ended
	Mar. 31, 2013	Apr. 30, 2013
Entity Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2013
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2013
Entity Registrant Name	ALASKA AIR GROUP, INC.
Entity Central Index Key	0000766421
Entity Filer Category	Large Accelerated Filer
Document Fiscal Period Focus	Q1
Entity Common Stock, Shares Outstanding		70,313,337