Boston to Seattle flights
The cheapest round trip we found from Boston to Seattle is $591 (Nov 23 – 30, 1 stop).
BOS to SEA · Round trip · Economy · Prices per person in USD · Price found (3 days ago)
Cheapest found
Cheapest round trip by month
Lowest fare found per departure month| Month | Cheapest round trip |
|---|---|
| November 2026 | $591 |
| December 2026 | No fares found yet |
| January 2027 | No fares found yet |
| February 2027 | No fares found yet |
| March 2027 | No fares found yet |
| April 2027 | No fares found yet |
| May 2027 | $448 (cheapest month) |
Cheapest dates in the next 4 months
Round trip, per person-
Nov 23 – 30 7 nights · leave Mon$591$591 Book
American Airlines 1 stop · 8h 04m -
Nov 18 – 20 2 nights · leave Wed$739$739 Book
American Airlines 1 stop · 7h 56m
Prices change often. The booking site shows the final price before you pay. Other dates? Set an alert
Things to do in Seattle
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Airport transfer to Seattle
Fixed prices from SEA on KiwitaxiTo see transfer prices here, turn on partner content in .
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Plan the rest of your trip
Seattle · Nov 23 – 30Partner links: we may earn a commission if you book, at no extra cost to you.
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Boston to Seattle: questions
How much does a flight from Boston to Seattle cost?
The cheapest round trip we have found right now is $591, leaving November 23 and returning November 30. Prices are per person, economy, in USD.
Which airports do Boston to Seattle flights use?
Boston airports include Logan International (BOS) and Pease Air Force Base (PSM). Seattle airports include Seattle-Tacoma International (SEA) and Boeing Field International (BFI). The prices on this page cover every airport in both cities (BOS and SEA are the city codes).
About this route
We track round-trip economy fares from Boston (United States) to Seattle (United States) using Travelpayouts / Aviasales data. The cheapest round trip we've found is $591, departing November 23 and returning November 30. The cheapest month to fly in our data is May, from $448. Prices are per person and were correct when found; the final price is set by the airline or booking site when you book.