S$227 Cheap Flights from Boston to Seattle

View S$227 flight on Mon, 12 Jan, 2026Opens in a new window

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

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Cheap Flights from Boston to Seattle (BOS-SEA)

Prices were available within the past 7 days and start at S$227 for one-way flights and S$402 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Alaska Airlines
Mon, 12 Jan - Tue, 27 Jan
BOS
Boston
SEA
Seattle
S$402 Return, found 2 days ago
S$402
Return
found 2 days ago
Select Alaska Airlines flight, departing Mon, 12 Jan from Boston to Seattle, returning Tue, 27 Jan, priced at S$402 found 2 days ago
Delta
Tue, 27 Jan - Sat, 14 Feb
BOS
Boston
SEA
Seattle
S$403 Return, found 2 days ago
S$403
Return
found 2 days ago
Select Delta flight, departing Tue, 27 Jan from Boston to Seattle, returning Sat, 14 Feb, priced at S$403 found 2 days ago
Alaska Airlines
Mon, 19 Jan - Tue, 3 Feb
BOS
Boston
SEA
Seattle
S$415 Return, found 2 days ago
S$415
Return
found 2 days ago
Select Alaska Airlines flight, departing Mon, 19 Jan from Boston to Seattle, returning Tue, 3 Feb, priced at S$415 found 2 days ago
Alaska Airlines
Mon, 5 Jan - Tue, 20 Jan
BOS
Boston
SEA
Seattle
S$436 Return, found 2 days ago
S$436
Return
found 2 days ago
Select Alaska Airlines flight, departing Mon, 5 Jan from Boston to Seattle, returning Tue, 20 Jan, priced at S$436 found 2 days ago
Delta
Sun, 4 Jan - Sun, 18 Jan
BOS
Boston
SEA
Seattle
S$447 Return, found 2 days ago
S$447
Return
found 2 days ago
Select Delta flight, departing Sun, 4 Jan from Boston to Seattle, returning Sun, 18 Jan, priced at S$447 found 2 days ago
Delta
Mon, 15 Dec - Mon, 5 Jan
BOS
Boston
SEA
Seattle
S$448 Return, found 2 days ago
S$448
Return
found 2 days ago
Select Delta flight, departing Mon, 15 Dec from Boston to Seattle, returning Mon, 5 Jan, priced at S$448 found 2 days ago
United
Sun, 7 Dec - Sun, 14 Dec
BOS
Boston
SEA
Seattle
S$480 Return, found 2 days ago
S$480
Return
found 2 days ago
Select United flight, departing Sun, 7 Dec from Boston to Seattle, returning Sun, 14 Dec, priced at S$480 found 2 days ago
American Airlines
Sun, 7 Dec - Sun, 14 Dec
BOS
Boston
SEA
Seattle
S$487 Return, found 2 days ago
S$487
Return
found 2 days ago
Select American Airlines flight, departing Sun, 7 Dec from Boston to Seattle, returning Sun, 14 Dec, priced at S$487 found 2 days ago
Delta
Tue, 16 Dec - Mon, 5 Jan
BOS
Boston
SEA
Seattle
S$494 Return, found 2 days ago
S$494
Return
found 2 days ago
Select Delta flight, departing Tue, 16 Dec from Boston to Seattle, returning Mon, 5 Jan, priced at S$494 found 2 days ago
Alaska Airlines
Mon, 8 Dec - Thu, 25 Dec
BOS
Boston
SEA
Seattle
S$506 Return, found 2 days ago
S$506
Return
found 2 days ago
Select Alaska Airlines flight, departing Mon, 8 Dec from Boston to Seattle, returning Thu, 25 Dec, priced at S$506 found 2 days ago

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

March is typically the cheapest month to fly

From S$204 - S$401 per traveller.

Alternative airports near Seattle

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Seattle - Tacoma Intl. SEA. Cheapest option available. Average driving time to city centre is 20 minutes. Flights from S$506
SEA
Seattle - Tacoma Intl.
Cheapest
Average driving time to city centre20 min
Flights from S$506
Boston to Seattle route information
Origin airport
Logan Intl.
Destination airport
Seattle - Tacoma Intl.
Return price
S$401
Distance
3980 km
Average flight time
4 hours 27 mins

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!

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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!

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$402. 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.

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