Cheapflights users have found 15 Delta flights for under $400 on the BOS-SEA route. Prices on flights to Seattle from Boston can vary based on many factors including dates. To look at price based on your preferred dates, click here.
Cheapflights users who travel with Delta (a popular airline from Boston to Seattle) have rated them a 6.2/10. This rating comes from 1,486 reviews. If you are looking to travel BOS-SEA, search your dates above.