Seattle to Boston flights
Routavio compares airline fares from several flight booking sites. Search Seattle to Boston to see the lowest price before you book.
Your next trip, last seen at €153
Lowest observedAlaska Airlines · 1 stop · One wayWhen to fly
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The lowest fare we observed for each month. Open a month to see its days, then pick your outbound and return. A day with no price is one we will search for you.
One-way fare
- Airlines seen
- Alaska Airlines, United Airlines, Frontier Airlines, Southwest Airlines, Sun Country Airlines
- Reported fastest flight
- 5h 19m
- Non-stop
- Yes
About this route
Explore the fares we observed from Seattle to Boston. Prices move often, so pick your dates to see the latest options.
- Route distance
- 4,000 km
- Reported fastest flight
- 5h 19m
- Alternative airports
- BFI, PSM
Route-level information; individual journeys vary.
Published schedules report non-stop service with Alaska Airlines, United Airlines, JetBlue. Check current timetables.
A clearer picture of your fare
If the observed fare for this date drops, we will email you. At most one message a day.
Airport to city: straight-line distance
- King County International Airport - Boeing Field (BFI) → Seattle, city gazetteer reference point (47.6062, -122.3321): ≈ 9 km.
- Seattle–Tacoma International Airport (SEA) → Seattle, city gazetteer reference point (47.6062, -122.3321): ≈ 18 km.
- Portsmouth International Airport at Pease (PSM) → Boston, city gazetteer reference point (42.3584, -71.0598): ≈ 82 km.
Approximate distances calculated from coordinates, not road distances or travel times. These airports serve the city; they are not confirmed endpoints of an offer.
Frequently asked
How much was a flight from Seattle to Boston?
A fare of €153 was seen on 15 Oct 2026. Fares change, so search your dates for the current price.
Are there direct flights from Seattle to Boston?
Yes. Published schedules report non-stop flights on this route with Alaska Airlines, United Airlines, JetBlue.
Which airlines fly from Seattle to Boston?
Routavio has seen these carriers on the route: Alaska Airlines, United Airlines, Frontier Airlines, Southwest Airlines, Sun Country Airlines.
How long does the flight from Seattle to Boston take?
Across the 76 fares Routavio observed, the average journey time is 9h 52m, including any stops. Individual departures vary; the fastest observed flight is listed in the route facts above.
How many of the observed Seattle to Boston fares were non-stop?
51 of the 77 fares we observed were non-stop; the rest included at least one stop. That describes our observations, not every flight that operates.
How observed prices work, what "No data" means and what a fare includes: Read the flight price guide · Price and schedule freshness on Routavio
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Recently observed fares. Prices may change.