Cheap flights from Boston to Seattle
The cheapest round trip from Boston to Seattle that travelers found recently is $415 with a carry-on: a $415 fare on Alaska Airlines, which usually includes a carry-on. It leaves Thu, Jan 7 and comes back Mon, Jan 11.
Live prices for Thu, Jan 7 to Mon, Jan 11
Cheapest trips travelers found recently
| Leave | Return | Airline | Airports | Stops | Fare | Carry-on (est.) | Total | Live prices |
|---|---|---|---|---|---|---|---|---|
| Thu, Jan 7 | Mon, Jan 11 | Alaska Airlines | BOS → SEA | 1 stop | $415 | Included | $415 | Live price |
| Mon, Nov 23 | Mon, Nov 30 | American Airlines | BOS → SEA | 1 stop | $424 | Included | $424 | Live price |
| Sat, Dec 26 | Tue, Jan 5 | Alaska Airlines | BOS → SEA | 1 stop | $438 | Included | $438 | Live price |
Round-trip prices per person, from real fares travelers found in the last few days. Carry-on fees are our estimate for each airline, both ways. Prices change fast: check the live price before you book.
Cheapest month to fly
| Month | Cheapest trip | From | Live prices |
|---|---|---|---|
| November 2026 | Mon, Nov 23 to Mon, Nov 30, 7 nights | $424 | Live price |
| December 2026 | Sat, Dec 26 to Tue, Jan 5, 10 nights | $438 | Live price |
| January 2027 | Thu, Jan 7 to Mon, Jan 11, 4 nights | $415 | Live price |
Bag fees on this route
What the airlines flying Boston to Seattle usually charge for one bag each way. Budget airlines often sell the cheapest fares and charge the most for bags, so compare the total, not the fare.
| Airline | Carry-on, each way | Checked bag, each way |
|---|---|---|
| Alaska Airlines | Included | $40 |
| American Airlines | Included | $40 |
Our estimates: fees depend on the fare type and when you pay. Check the airline's own price when you book.
How these prices work
These are real round-trip fares that travelers found on Aviasales recently, not a live search, so they can change or sell out. Dipt adds an estimate of each airline's carry-on fee, so a cheap fare with expensive bags doesn't look cheaper than it is. "Live price" opens Dipt's live flight search for those dates, where you book with the airline or travel site you pick. Dipt may earn a commission when you book, at no extra cost to you (how Dipt makes money).
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