Cheap Flights from Boston to Seattle
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The latest fare from Boston to Seattle: $372 round trip, Dec 17 – Dec 24, seen Nov 5. Prices by month are below.
Across 5 months of observations from Boston to Seattle, the lowest round-trip economy fare we recorded was $175, in September. The typical economy fare was $352. September was the cheapest month we saw and November the dearest.
The most recent economy price we saw on this route was $372 on Alaska, seen Nov 5.
See every deal from Boston, to Seattle, or the return direction Seattle to Boston.
Latest economy price we saw: Boston to Seattle
The most recent economy round-trip fare we saw on this route.
| From | Price | Per mile | Travel dates | Airline | Seen | Check price |
|---|---|---|---|---|---|---|
| Boston (BOS) to Seattle (SEA) | $372 | 7.5¢ | Dec 17 – Dec 24 | Alaska | Nov 5 | Check price |
Economy price history: Boston to Seattle
The lowest fares we saw each month.
| Month | Low | Typical | Sightings |
|---|---|---|---|
| Nov 2026 | $367 | $377 | 6 |
| Oct 2026 | $300 | $382 | 83 |
| Sep 2026 | $175 | $355 | 188 |
| Aug 2026 | $226 | $341 | 284 |
| Jul 2026 | $308 | $308 | 1 |
Frequently asked questions
How many flight deals from Boston to Seattle are on Sparkflights right now?
There are 0 deals from Boston to Seattle on the board right now.
What is the lowest price ever seen from Boston to Seattle?
The lowest economy fare we've recorded from Boston to Seattle is $175, based on 562 price observations over 5 months.
How much does a flight from Boston to Seattle cost?
The typical round-trip economy fare we observed from Boston to Seattle is $352, against a recorded low of $175. These are observations, not quotes.
When is the cheapest month to fly Boston to Seattle?
For economy fares from Boston to Seattle, September was the cheapest month we observed and November the dearest, over 5 months of data.
What is the current price from Boston to Seattle?
The most recent economy fare we saw from Boston to Seattle is $372, on Nov 5.