Cheap flights from Seattle to Boston
The cheapest round trip from Seattle to Boston that travelers found recently is $451 with a carry-on: a $451 fare on Southwest, which usually includes a carry-on. It leaves Wed, Nov 25 and comes back Mon, Nov 30.
Live prices for Wed, Nov 25 to Mon, Nov 30
Cheapest trips travelers found recently
| Leave | Return | Airline | Airports | Stops | Fare | Carry-on (est.) | Total | Live prices |
|---|---|---|---|---|---|---|---|---|
| Wed, Nov 25 | Mon, Nov 30 | Southwest | SEA → BOS | 1 stop | $451 | Included | $451 | Live price |
| Wed, Dec 23 | Fri, Jan 1 | Alaska Airlines | SEA → BOS | 1 stop | $473 | Included | $473 | Live price |
| Wed, Nov 25 | Sun, Nov 29 | Alaska Airlines | SEA → BOS | Nonstop | $574 | Included | $574 | 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 | Wed, Nov 25 to Mon, Nov 30, 5 nights | $451 | Live price |
| December 2026 | Wed, Dec 23 to Fri, Jan 1, 9 nights | $473 | Live price |
Bag fees on this route
What the airlines flying Seattle to Boston 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 |
| Southwest | Included | $35 |
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).
Not sure where to go? Tell Dipt your budget and vibe and it finds the trip.
More cheap flights from Seattle
- Seattle to Amsterdam
- Seattle to Athens
- Seattle to Atlanta
- Seattle to Austin
- Seattle to Bali
- Seattle to Bangkok
- Seattle to Barcelona
- Seattle to Berlin
- Seattle to Cancún
- Seattle to Cartagena
- Seattle to Chicago
- Seattle to Denver
- Seattle to Dublin
- Seattle to Honolulu
- Seattle to Las Vegas
- Seattle to Lisbon
- Seattle to London
- Seattle to Los Angeles
- Seattle to Medellín
- Seattle to Mexico City
- Seattle to Miami
- Seattle to Montréal
- Seattle to Nashville
- Seattle to New Orleans
- Seattle to New York
- Seattle to Paris
- Seattle to Reykjavík
- Seattle to San Diego
- Seattle to San Francisco
- Seattle to San Juan
- Seattle to Seoul
- Seattle to Tokyo
- Seattle to Toronto