Flights from Boston to Seattle
Find and compare Boston to Seattle flights below: airline choices, nonstop availability, flight time and the months that usually offer the best value.
Boston to Seattle flights overview
Fares on the Boston to Seattle route move daily with demand, sales and seat availability, so BookingTrolley compares live prices from several suppliers in one place. Based on this route's seasonal pattern, fares average roughly $ 525.00 over the year. Nov tends to be the cheapest month to fly (around $ 438.00), while Jun is usually the most expensive at about $ 652.00 — a swing of roughly 49%.
BOS and SEA sit roughly 4,006 km apart, so total travel time depends on whether you fly nonstop or connect. Both full-service and low-cost carriers serve this corridor; BookingTrolley compares their published fares so you can weigh price against flight time and baggage.
Frequently asked questions about flying from Boston to Seattle
Tuesday and Wednesday are typically the cheapest days on Boston to Seattle for United States travellers, with Friday and Sunday often higher. BookingTrolley compares mid-week and weekend fares on BOS–SEA.
Full-service and low-cost carriers compete from Boston (BOS) to Seattle (SEA). BookingTrolley compares published fares so United States travellers can see which carrier is cheapest.
Economy round-trip flights on Boston to Seattle vary by season. BookingTrolley tracks live fares on BOS–SEA so United States travellers can compare current prices.
Flight time from Boston to Seattle depends on the airline and on whether the itinerary is nonstop or connecting. BookingTrolley shows a duration only when it is calculated from observed departure and arrival times.
Shoulder months often pair good weather with lower airfare into Seattle. BookingTrolley price trends on Boston to Seattle show steeper rises around major United States holiday periods.
Use BookingTrolley's flexible-date comparison for Boston (BOS) to Seattle (SEA) to see which days cost least. Avoiding Friday–Sunday peaks is one of the fastest ways for United States travellers to cut the ticket price.
Find cheap flights on popular routes
Explore fares from Boston, into Seattle, and on related corridors with BookingTrolley.
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