S$140 Cheap Flights from Seattle to Boston

View S$140 flight on Sat, 20 Sep, 2025Opens in a new window

Popular airlines from Seattle-Tacoma International Airport (SEA) to Logan International Airport (BOS)

  • Plan, book, fly with confidence

  • trending down icon

    Be in the know

    Get alerts if flight prices drop or rise*
  • bex rewards loyalty icon

    Book smarter

    Save up to 40% on select hotels after you book a flight*
  • payments icon

    Earn twice

    Earn your airline miles on top of our rewards
    Sign in

Cheap Flights from Seattle to Boston (SEA-BOS)

Prices were available within the past 7 days and start at S$140 for one-way flights and S$277 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Sat, 20 Sep - Sat, 27 Sep
SEA
Seattle
BOS
Boston
S$277 Return, found 6 days ago
S$277
Return
found 6 days ago
Select Delta flight, departing Sat, 20 Sep from Seattle to Boston, returning Sat, 27 Sep, priced at S$277 found 6 days ago
Delta
Sat, 1 Nov - Sat, 8 Nov
SEA
Seattle
BOS
Boston
S$304 Return, found 2 days ago
S$304
Return
found 2 days ago
Select Delta flight, departing Sat, 1 Nov from Seattle to Boston, returning Sat, 8 Nov, priced at S$304 found 2 days ago
Delta
Sat, 11 Oct - Sat, 18 Oct
SEA
Seattle
BOS
Boston
S$330 Return, found 16 hours ago
S$330
Return
found 16 hours ago
Select Delta flight, departing Sat, 11 Oct from Seattle to Boston, returning Sat, 18 Oct, priced at S$330 found 16 hours ago
Delta
Sat, 20 Sep - Sat, 27 Sep
SEA
Seattle
BOS
Boston
S$342 Return, found 6 days ago
S$342
Return
found 6 days ago
Select Delta flight, departing Sat, 20 Sep from Seattle to Boston, returning Sat, 27 Sep, priced at S$342 found 6 days ago
United
Sat, 20 Sep - Sat, 27 Sep
SEA
Seattle
BOS
Boston
S$355 Return, found 6 days ago
S$355
Return
found 6 days ago
Select United flight, departing Sat, 20 Sep from Seattle to Boston, returning Sat, 27 Sep, priced at S$355 found 6 days ago
United
Sat, 11 Oct - Sat, 18 Oct
SEA
Seattle
BOS
Boston
S$356 Return, found 16 hours ago
S$356
Return
found 16 hours ago
Select United flight, departing Sat, 11 Oct from Seattle to Boston, returning Sat, 18 Oct, priced at S$356 found 16 hours ago
Delta
Thu, 4 Sep - Wed, 10 Sep
SEA
Seattle
BOS
Boston
S$356 Return, found 3 hours ago
S$356
Return
found 3 hours ago
Select Delta flight, departing Thu, 4 Sep from Seattle to Boston, returning Wed, 10 Sep, priced at S$356 found 3 hours ago
Delta
Sat, 1 Nov - Sat, 8 Nov
SEA
Seattle
BOS
Boston
S$363 Return, found 2 days ago
S$363
Return
found 2 days ago
Select Delta flight, departing Sat, 1 Nov from Seattle to Boston, returning Sat, 8 Nov, priced at S$363 found 2 days ago
Delta
Sat, 20 Sep - Sat, 27 Sep
SEA
Seattle
BOS
Boston
S$367 Return, found 6 days ago
S$367
Return
found 6 days ago
Select Delta flight, departing Sat, 20 Sep from Seattle to Boston, returning Sat, 27 Sep, priced at S$367 found 6 days ago
American Airlines
Sat, 1 Nov - Sat, 8 Nov
SEA
Seattle
BOS
Boston
S$381 Return, found 2 days ago
S$381
Return
found 2 days ago
Select American Airlines flight, departing Sat, 1 Nov from Seattle to Boston, returning Sat, 8 Nov, priced at S$381 found 2 days ago

Find the cheapest month to fly from Seattle (SEA) to Boston (BOS)

September is typically the cheapest month to fly

From S$190 - S$325 per traveller.

Graph displaying average flight prices per month

Seattle to Boston route information
Origin airport
Seattle - Tacoma Intl.
Destination airport
Logan Intl.
Airlines serving
American Airlines, Delta, United
Return price
S$277
Distance
3980 km
Average flight time
8 hours 23 mins

Flights from Seattle to Boston

There are several airlines that operate frequent flights from Seattle (SEA) to Boston (BOS) including

The earliest flight leaves Seattle Tacoma Intl. Airport at 07:00 and arrives at Logan Intl. Airport at 05:37. The last flight of the day departs Seattle at 23:59 and arrives at Boston at 23:59.

The flight distance from Seattle to Boston is about 4026 km, the shortest flight is 05 hours 05 minutes with .

Expedia lets you search across the largest number of airlines and Boston flights, which means that you’ll be able to find a great flight deal at the perfect travel date and time. Our simple-to-use booking engine makes looking for terrific bargains easy and hassle-free; just enter your travel dates and departure city, and let Expedia do the rest! Adjust your travel dates and explore connecting flights to find an even better deal on your Seattle Boston flight!

Browse through dozens of options and rest assured that you’re seeing the best price guaranteed! Our friendly customer service representatives are here to serve you 24 hours day to provide assistance and answer any questions that you may have about booking your Seattle to Boston trip. There’s simply no substitute for great prices suited to your travel needs and backed by excellent customer support.

Combine your Boston flight with a hotel and/or car rental for a package deal designed to save you even more money! Discover additional savings by booking in advance or find a last minute deal. There are tons of ways to save on your flights from Seattle to Boston with Expedia. Use us as your stop travel destination and have the confidence that you’re getting a bargain!

Frequently asked questions

How much is a flight from SEA to Logan Intl. Airport (BOS)?
If you're travelling from Sea-Tac Airport to BOS, round-trip flights start from S$277. This figure is based on fares listed within the last 7 days on Expedia for flights departing within the next year, so don't wait around. Book today and save yourself both money and time. Prices and availability are subject to change. Additional terms apply.
Do I need to pay a cancellation fee if I cancel my flight from Seattle - Tacoma Intl. Airport (SEA) to BOS?
We get that your situation can change unexpectedly, so we've made it as hassle-free as possible for you to cancel your flight online. Just head to the Customer Service Portal and follow the instructions.
How do I find cheap flights from Seattle - Tacoma Intl. Airport (SEA) to Logan Intl. Airport (BOS) that have flexible change policies?
Many airlines offer the option to reschedule your flight without a change fee. All you pay is the difference between the original flight and the new flight. When you're searching for SEA to Logan Intl. Airport flights, you'll see a "no change fees" filter for you to select.
How far is the flight from Sea-Tac Airport to Logan Intl. Airport?
With around 4,000 kilometres separating Sea-Tac Airport and Logan Intl. Airport, your flight will be a long one. Pack wisely to make your time in the air more comfortable. Simple things like an eye mask and a quality neck pillow can make a massive difference.
Which airlines fly direct from Seattle - Tacoma Intl. Airport (SEA) to Logan Intl. Airport?
A popular airline that operates on the route from SEA to Logan Intl. Airport (BOS) is Alaska Airlines (AS). It offers 117 flights a month. Like some more options? Check out the airfares with Delta Air Lines (DL). This carrier offers 78 monthly flights between these airports.
Are Sea-Tac Airport to BOS flight tickets cheaper when they're purchased at the last minute?
It is possible to nab great last-minute deals from Sea-Tac Airport to BOS, but there's no guarantee. As many airlines advertise prices up to a year in advance, it's worth keeping an eye on fares early and being ready to pounce when you spot a bargain. Expedia compares air carrier prices and updates flight deals all the time, so you can feel confident knowing you're always getting the latest offers.

Explore a world of travel with Expedia

*Available to Expedia members.