Cheapflights users have found 12 Alaska Airlines flights for under $400 on the SEA-BOS route. Prices on flights to Boston from Seattle can vary based on many factors including dates. To look at price based on your preferred dates, click here.
The average rating from 1,486 Alaska Airlines reviews by Cheapflights users is 6.2 (out of a maximum rating of 10). If you are considering flying SEA-BOS with Cheapflights, apply your desired dates to the form above to see our best pricing for your trip to Boston with Alaska Airlines.