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That's the lowest price we could find for select routes on comparable carriers by $137. Buy Now at DealBase Tips On the DealBase landing page, click on "Alaska Airlines" in the top line to see this sale. We found this price on flights departing on February 11 from Boise, ID (BOI) to Seattle, WA (SEA). All prices, dates, and booking details were valid at the time of publication. Book this travel deal by January 21 for flights from February 4 through April 20.