₩138,700 Cheap Flights from Boston (BOS) to Seattle (SEA)

View ₩138,700 flight on Wed, Nov 5, 2025Opens 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 ₩138,700 for one-way flights and ₩346,900 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Hawaiian Airlines
Tue, Feb 10 - Wed, Feb 11
BOS
Boston
SEA
Seattle
₩346,900 Roundtrip, found 2 days ago
₩346,900
Roundtrip
found 2 days ago
Select Hawaiian Airlines flight, departing Tue, Feb 10 from Boston to Seattle, returning Wed, Feb 11, priced at ₩346,900 found 2 days ago
Delta
Tue, Feb 10 - Thu, Feb 12
BOS
Boston
SEA
Seattle
₩347,400 Roundtrip, found 2 days ago
₩347,400
Roundtrip
found 2 days ago
Select Delta flight, departing Tue, Feb 10 from Boston to Seattle, returning Thu, Feb 12, priced at ₩347,400 found 2 days ago
United
Thu, Oct 23 - Wed, Oct 29
BOS
Boston
SEA
Seattle
₩348,100 Roundtrip, found 4 days ago
₩348,100
Roundtrip
found 4 days ago
Select United flight, departing Thu, Oct 23 from Boston to Seattle, returning Wed, Oct 29, priced at ₩348,100 found 4 days ago
Delta
Fri, Oct 24 - Fri, Oct 31
BOS
Boston
SEA
Seattle
₩348,600 Roundtrip, found 4 days ago
₩348,600
Roundtrip
found 4 days ago
Select Delta flight, departing Fri, Oct 24 from Boston to Seattle, returning Fri, Oct 31, priced at ₩348,600 found 4 days ago
American Airlines
Thu, Oct 23 - Wed, Oct 29
BOS
Boston
SEA
Seattle
₩354,500 Roundtrip, found 4 days ago
₩354,500
Roundtrip
found 4 days ago
Select American Airlines flight, departing Thu, Oct 23 from Boston to Seattle, returning Wed, Oct 29, priced at ₩354,500 found 4 days ago
United
Thu, Oct 23 - Wed, Oct 29
BOS
Boston
SEA
Seattle
₩375,600 Roundtrip, found 4 days ago
₩375,600
Roundtrip
found 4 days ago
Select United flight, departing Thu, Oct 23 from Boston to Seattle, returning Wed, Oct 29, priced at ₩375,600 found 4 days ago
American Airlines
Thu, Oct 23 - Wed, Oct 29
BOS
Boston
SEA
Seattle
₩382,600 Roundtrip, found 4 days ago
₩382,600
Roundtrip
found 4 days ago
Select American Airlines flight, departing Thu, Oct 23 from Boston to Seattle, returning Wed, Oct 29, priced at ₩382,600 found 4 days ago
Hawaiian Airlines
Tue, Feb 10 - Tue, Feb 17
BOS
Boston
SEA
Seattle
₩389,000 Roundtrip, found 2 days ago
₩389,000
Roundtrip
found 2 days ago
Select Hawaiian Airlines flight, departing Tue, Feb 10 from Boston to Seattle, returning Tue, Feb 17, priced at ₩389,000 found 2 days ago
Delta
Tue, Feb 10 - Sat, Feb 14
BOS
Boston
SEA
Seattle
₩389,500 Roundtrip, found 2 days ago
₩389,500
Roundtrip
found 2 days ago
Select Delta flight, departing Tue, Feb 10 from Boston to Seattle, returning Sat, Feb 14, priced at ₩389,500 found 2 days ago
Delta
Tue, Feb 10 - Fri, Feb 20
BOS
Boston
SEA
Seattle
₩412,000 Roundtrip, found 2 days ago
₩412,000
Roundtrip
found 2 days ago
Select Delta flight, departing Tue, Feb 10 from Boston to Seattle, returning Fri, Feb 20, priced at ₩412,000 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 ₩219,299 - ₩430,987 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 ₩346,900. 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

Travel information

Origin airport
Logan Intl.
Destination airport
Seattle - Tacoma Intl.
Roundtrip price
₩346,900
Distance
3980 km
Average flight time
3 hours 51 mins

Book with confidence

Book with confidence

Boston to Seattle Flights

Sometimes you just need to get out of town or maybe you’re looking for a change of scenery. Regardless of the reason, a flight from Boston to Seattle will do just the trick! Go on, plan to see all the famous landmarks and eat your weight in the local cuisine. Your trip is beckoning, so answer the call by packing your suitcase and filling your travel itinerary with exploring Seattle.

Whether you’re flying for business or jet-setting on your personal time, you’ve come to the right place. Here at Expedia.com, we’ll pair you up with BOS to SEA flights that won’t make your bank account wince. Ready to temporarily leave behind Boston for new horizons? Browse through our cheap airfare, and filter by flight times and dates until you find just what you had in mind. From flights without layovers to ones that arrive early in the morning, you’ll come across plane tickets that suit your travel preferences. You can even bundle your flight to SEA with hotels and car rentals to score even bigger savings.

All set to hit the clouds? Book your travel arrangements with us today and have left-over money to put toward your travel outings and adventures.

Boston to Seattle Flights

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