₩223,300 Cheap Flights from Boston (BOS) to Seattle (SEA)

View ₩223,300 flight on Wed, May 13, 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 ₩223,300 for one-way flights and ₩446,400 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Wed, May 13 - Wed, May 20
BOS
Boston
SEA
Seattle
₩446,400 Roundtrip, found 2 days ago
₩446,400
Roundtrip
found 2 days ago
Select Delta flight, departing Wed, May 13 from Boston to Seattle, returning Wed, May 20, priced at ₩446,400 found 2 days ago
Delta
Sat, May 23 - Sat, May 30
BOS
Boston
SEA
Seattle
₩477,700 Roundtrip, found 3 days ago
₩477,700
Roundtrip
found 3 days ago
Select Delta flight, departing Sat, May 23 from Boston to Seattle, returning Sat, May 30, priced at ₩477,700 found 3 days ago
American Airlines
Wed, May 13 - Wed, May 20
BOS
Boston
SEA
Seattle
₩529,000 Roundtrip, found 2 days ago
₩529,000
Roundtrip
found 2 days ago
Select American Airlines flight, departing Wed, May 13 from Boston to Seattle, returning Wed, May 20, priced at ₩529,000 found 2 days ago
Delta
Sat, May 23 - Sat, May 30
BOS
Boston
SEA
Seattle
₩530,300 Roundtrip, found 3 days ago
₩530,300
Roundtrip
found 3 days ago
Select Delta flight, departing Sat, May 23 from Boston to Seattle, returning Sat, May 30, priced at ₩530,300 found 3 days ago
Delta
Wed, May 13 - Wed, May 20
BOS
Boston
SEA
Seattle
₩544,000 Roundtrip, found 2 days ago
₩544,000
Roundtrip
found 2 days ago
Select Delta flight, departing Wed, May 13 from Boston to Seattle, returning Wed, May 20, priced at ₩544,000 found 2 days ago
Delta
Sat, May 23 - Sat, May 30
BOS
Boston
SEA
Seattle
₩545,600 Roundtrip, found 3 days ago
₩545,600
Roundtrip
found 3 days ago
Select Delta flight, departing Sat, May 23 from Boston to Seattle, returning Sat, May 30, priced at ₩545,600 found 3 days ago
United
Sat, May 23 - Sat, May 30
BOS
Boston
SEA
Seattle
₩552,900 Roundtrip, found 3 days ago
₩552,900
Roundtrip
found 3 days ago
Select United flight, departing Sat, May 23 from Boston to Seattle, returning Sat, May 30, priced at ₩552,900 found 3 days ago
Delta
Wed, May 13 - Wed, May 20
BOS
Boston
SEA
Seattle
₩566,500 Roundtrip, found 2 days ago
₩566,500
Roundtrip
found 2 days ago
Select Delta flight, departing Wed, May 13 from Boston to Seattle, returning Wed, May 20, priced at ₩566,500 found 2 days ago
Delta
Sat, May 23 - Sat, May 30
BOS
Boston
SEA
Seattle
₩568,100 Roundtrip, found 3 days ago
₩568,100
Roundtrip
found 3 days ago
Select Delta flight, departing Sat, May 23 from Boston to Seattle, returning Sat, May 30, priced at ₩568,100 found 3 days ago
Delta
Wed, May 13 - Wed, May 20
BOS
Boston
SEA
Seattle
₩581,700 Roundtrip, found 2 days ago
₩581,700
Roundtrip
found 2 days ago
Select Delta flight, departing Wed, May 13 from Boston to Seattle, returning Wed, May 20, priced at ₩581,700 found 2 days ago

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

March is typically the cheapest month to fly

From ₩228,768 - ₩449,071 per traveler.

Frequently asked questions

How much is a flight from Logan Intl. Airport to SEA?
If you're planning on traveling between Logan Intl. Airport (BOS) and Sea-Tac Airport, round-trip journeys start from ₩446,400. 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 canceled 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 kilometers 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-canceling 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.
Roundtrip price
₩446,400
Distance
3980 km
Average flight time
4 hours 40 mins
*Available to Expedia members.