S$167 Cheap Flights from Boston to Seattle

View S$167 flight on Fri, 23 Jan, 2026Opens in a new window

Popular airlines from Boston to Seattle

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Cheap Flights from Boston to Seattle (BOS-SEA)

Prices were available within the past 7 days and start at S$167 for one-way flights and S$333 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Mon, 12 Jan - Wed, 21 Jan
BOS
Boston
SEA
Seattle
S$333 Return, found 5 days ago
S$333
Return
found 5 days ago
Select Delta flight, departing Mon, 12 Jan from Boston to Seattle, returning Wed, 21 Jan, priced at S$333 found 5 days ago
Delta
Mon, 12 Jan - Wed, 21 Jan
BOS
Boston
SEA
Seattle
S$345 Return, found 5 days ago
S$345
Return
found 5 days ago
Select Delta flight, departing Mon, 12 Jan from Boston to Seattle, returning Wed, 21 Jan, priced at S$345 found 5 days ago
Delta
Mon, 12 Jan - Wed, 21 Jan
BOS
Boston
SEA
Seattle
S$358 Return, found 5 days ago
S$358
Return
found 5 days ago
Select Delta flight, departing Mon, 12 Jan from Boston to Seattle, returning Wed, 21 Jan, priced at S$358 found 5 days ago
Delta
Tue, 3 Mar - Sun, 8 Mar
BOS
Boston
SEA
Seattle
S$396 Return, found 11 hours ago
S$396
Return
found 11 hours ago
Select Delta flight, departing Tue, 3 Mar from Boston to Seattle, returning Sun, 8 Mar, priced at S$396 found 11 hours ago
Delta
Mon, 12 Jan - Wed, 21 Jan
BOS
Boston
SEA
Seattle
S$397 Return, found 5 days ago
S$397
Return
found 5 days ago
Select Delta flight, departing Mon, 12 Jan from Boston to Seattle, returning Wed, 21 Jan, priced at S$397 found 5 days ago
United
Mon, 12 Jan - Wed, 21 Jan
BOS
Boston
SEA
Seattle
S$404 Return, found 5 days ago
S$404
Return
found 5 days ago
Select United flight, departing Mon, 12 Jan from Boston to Seattle, returning Wed, 21 Jan, priced at S$404 found 5 days ago
Delta
Mon, 12 Jan - Wed, 21 Jan
BOS
Boston
SEA
Seattle
S$410 Return, found 5 days ago
S$410
Return
found 5 days ago
Select Delta flight, departing Mon, 12 Jan from Boston to Seattle, returning Wed, 21 Jan, priced at S$410 found 5 days ago
Delta
Tue, 3 Mar - Sun, 8 Mar
BOS
Boston
SEA
Seattle
S$416 Return, found 11 hours ago
S$416
Return
found 11 hours ago
Select Delta flight, departing Tue, 3 Mar from Boston to Seattle, returning Sun, 8 Mar, priced at S$416 found 11 hours ago
Delta
Mon, 12 Jan - Wed, 21 Jan
BOS
Boston
SEA
Seattle
S$422 Return, found 5 days ago
S$422
Return
found 5 days ago
Select Delta flight, departing Mon, 12 Jan from Boston to Seattle, returning Wed, 21 Jan, priced at S$422 found 5 days ago
American Airlines
Tue, 3 Mar - Sun, 8 Mar
BOS
Boston
SEA
Seattle
S$467 Return, found 11 hours ago
S$467
Return
found 11 hours ago
Select American Airlines flight, departing Tue, 3 Mar from Boston to Seattle, returning Sun, 8 Mar, priced at S$467 found 11 hours ago

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

March is typically the cheapest month to fly

From S$203 - S$398 per traveller.

Frequently asked questions

How much is a flight from Logan Intl. Airport to SEA?
If you're planning on travelling between Logan Intl. Airport (BOS) and Sea-Tac Airport, round-trip journeys start from S$333. This price is based on fares available within the last 7 days on Expedia for flights departing within the next year, so don't delay. Book today and save yourself 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 BOS to SEA?
The majority of flights can be cancelled online, but whether you are charged a fee differs between airlines. If you do have to cancel your trip, follow the instructions in the Customer Service Portal.
How do I find cheap flights from Logan Intl. Airport to SEA 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 Logan Intl. Airport (BOS) to Seattle - Tacoma Intl. Airport (SEA) flights, you'll see a "no change fees" filter for you to select.
How far is the flight from Logan Intl. Airport to Sea-Tac Airport?
With around 4,000 kilometres separating Boston and SeaTac, your flight will be a long one. Pack wisely to make your time on board more comfortable. Things like a sleep mask and some noise-cancelling headphones can make all the difference.
Which airlines fly direct from BOS to Seattle - Tacoma Intl. Airport (SEA)?
With 117 flights every month operating from Logan Intl. Airport to Sea-Tac Airport, Alaska Airlines (AS) is a popular choice. Love some more options? Check out the airfares with Delta Air Lines (DL). This carrier offers 78 flights a month between these airports.
Are Logan Intl. Airport to Sea-Tac Airport flight tickets cheaper when they're purchased at the last minute?
Late planners can sometimes pick up a bargain, with some super cheap fares from Logan Intl. Airport to Sea-Tac Airport arising a few weeks prior to the departure date. If you'd rather book ahead of time, Expedia compares and updates all the best flight deals continuously — as early as a year in advance in some cases. It does depend on the carrier though, as not all airlines advertise prices that far in advance.

Travel information

Origin airport
Logan Intl.
Destination airport
Seattle - Tacoma Intl.
Airlines serving
American Airlines, Delta, United
Return price
S$332
Distance
3980 km
Average flight time
4 hours 56 mins

Book with confidence

Flights from Boston to Seattle

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

The earliest flight leaves Logan Intl. Airport at 06:54 and arrives at Seattle Tacoma Intl. Airport at 10:09. The last flight of the day departs Boston at 19:52 and arrives at Seattle at 23:08.

The flight distance from Boston to Seattle is about 4026 km, the shortest flight is 06 hours 05 minutes with .

Expedia lets you search across the largest number of airlines and Seattle 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 Boston Seattle 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 Boston to Seattle trip. There’s simply no substitute for great prices suited to your travel needs and backed by excellent customer support.

Combine your Seattle 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 Boston to Seattle with Expedia. Use us as your stop travel destination and have the confidence that you’re getting a bargain!

Flights from Boston to Seattle

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