฿4,805 Cheap Flights from Seattle (SEA) to Boston (BOS)

View ฿4,805 flight on Wed, 21 Oct 2026Opens in a new window

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

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Cheap Flights from Seattle (SEA) to Boston (BOS)

Prices were available within the past 7 days and start at ฿4,805 for one-way flights and ฿10,740 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Tue, 27 Oct - Fri, 30 Oct
SEA
Seattle
BOS
Boston
฿10,740 Return, found 2 days ago
฿10,740
Return
found 2 days ago
Select Delta flight, departing Tue, 27 Oct from Seattle to Boston, returning Fri, 30 Oct, priced at ฿10,740 found 2 days ago
Delta
Tue, 27 Oct - Fri, 30 Oct
SEA
Seattle
BOS
Boston
฿12,195 Return, found 2 days ago
฿12,195
Return
found 2 days ago
Select Delta flight, departing Tue, 27 Oct from Seattle to Boston, returning Fri, 30 Oct, priced at ฿12,195 found 2 days ago
United
Tue, 27 Oct - Fri, 30 Oct
SEA
Seattle
BOS
Boston
฿12,355 Return, found 2 days ago
฿12,355
Return
found 2 days ago
Select United flight, departing Tue, 27 Oct from Seattle to Boston, returning Fri, 30 Oct, priced at ฿12,355 found 2 days ago
American Airlines
Tue, 27 Oct - Fri, 30 Oct
SEA
Seattle
BOS
Boston
฿12,515 Return, found 2 days ago
฿12,515
Return
found 2 days ago
Select American Airlines flight, departing Tue, 27 Oct from Seattle to Boston, returning Fri, 30 Oct, priced at ฿12,515 found 2 days ago
American Airlines
Tue, 27 Oct - Fri, 30 Oct
SEA
Seattle
BOS
Boston
฿12,520 Return, found 2 days ago
฿12,520
Return
found 2 days ago
Select American Airlines flight, departing Tue, 27 Oct from Seattle to Boston, returning Fri, 30 Oct, priced at ฿12,520 found 2 days ago
United
Tue, 27 Oct - Fri, 30 Oct
SEA
Seattle
BOS
Boston
฿12,530 Return, found 2 days ago
฿12,530
Return
found 2 days ago
Select United flight, departing Tue, 27 Oct from Seattle to Boston, returning Fri, 30 Oct, priced at ฿12,530 found 2 days ago
Delta
Tue, 27 Oct - Fri, 30 Oct
SEA
Seattle
BOS
Boston
฿13,000 Return, found 2 days ago
฿13,000
Return
found 2 days ago
Select Delta flight, departing Tue, 27 Oct from Seattle to Boston, returning Fri, 30 Oct, priced at ฿13,000 found 2 days ago
American Airlines
Sat, 13 Jun - Mon, 15 Jun
SEA
Seattle
BOS
Boston
฿13,325 Return, found 2 days ago
฿13,325
Return
found 2 days ago
Select American Airlines flight, departing Sat, 13 Jun from Seattle to Boston, returning Mon, 15 Jun, priced at ฿13,325 found 2 days ago
Delta
Tue, 27 Oct - Fri, 30 Oct
SEA
Seattle
BOS
Boston
฿13,355 Return, found 2 days ago
฿13,355
Return
found 2 days ago
Select Delta flight, departing Tue, 27 Oct from Seattle to Boston, returning Fri, 30 Oct, priced at ฿13,355 found 2 days ago
Delta
Tue, 27 Oct - Fri, 30 Oct
SEA
Seattle
BOS
Boston
฿13,480 Return, found 2 days ago
฿13,480
Return
found 2 days ago
Select Delta flight, departing Tue, 27 Oct from Seattle to Boston, returning Fri, 30 Oct, priced at ฿13,480 found 2 days ago

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

May is typically the cheapest month to fly

From ฿6,460 - ฿10,976 per traveller.

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 ฿10,740. 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.

Travel information

Origin airport
Seattle - Tacoma Intl.
Destination airport
Logan Intl.
Airlines serving
American Airlines, Delta, United
Return price
฿10,740
Distance
3980 km
Average flight time
8 hours 23 mins
*Available to Expedia members.