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Save at least $5 on select routes through mid-November, and change or cancel your plans without any fees. Buy Now at DealBase Tips On the DealBase landing page, click "Alaska Airlines" in the top line to see this sale. We found this price on flights departing on November 17 from Boise, ID (BOI) to Seattle, WA (SEA). Book this travel deal by June 8 for flights from July 7 through November 18. Of note, tickets purchased through May 31 can be changed or cancelled with no fees, although fare differences between itineraries may apply.