฿3,850 Cheap Flights from Boston (BOS) to Seattle (SEA)

View ฿3,850 flight on Sat, 1 Nov 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 (BOS) to Seattle (SEA)

Prices were available within the past 7 days and start at ฿3,850 for one-way flights and ฿7,745 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Tue, 4 Nov - Tue, 11 Nov
BOS
Boston
SEA
Seattle
฿7,745 Return, found 1 day ago
฿7,745
Return
found 1 day ago
Select Delta flight, departing Tue, 4 Nov from Boston to Seattle, returning Tue, 11 Nov, priced at ฿7,745 found 1 day ago
Delta
Thu, 20 Nov - Tue, 2 Dec
BOS
Boston
SEA
Seattle
฿7,925 Return, found 5 days ago
฿7,925
Return
found 5 days ago
Select Delta flight, departing Thu, 20 Nov from Boston to Seattle, returning Tue, 2 Dec, priced at ฿7,925 found 5 days ago
Delta
Sat, 22 Nov - Tue, 2 Dec
BOS
Boston
SEA
Seattle
฿8,995 Return, found 5 days ago
฿8,995
Return
found 5 days ago
Select Delta flight, departing Sat, 22 Nov from Boston to Seattle, returning Tue, 2 Dec, priced at ฿8,995 found 5 days ago
Delta
Thu, 23 Oct - Wed, 29 Oct
BOS
Boston
SEA
Seattle
฿9,050 Return, found 11 hours ago
฿9,050
Return
found 11 hours ago
Select Delta flight, departing Thu, 23 Oct from Boston to Seattle, returning Wed, 29 Oct, priced at ฿9,050 found 11 hours ago
Delta
Sat, 22 Nov - Thu, 27 Nov
BOS
Boston
SEA
Seattle
฿9,250 Return, found 5 days ago
฿9,250
Return
found 5 days ago
Select Delta flight, departing Sat, 22 Nov from Boston to Seattle, returning Thu, 27 Nov, priced at ฿9,250 found 5 days ago
Delta
Tue, 18 Nov - Thu, 27 Nov
BOS
Boston
SEA
Seattle
฿9,350 Return, found 5 days ago
฿9,350
Return
found 5 days ago
Select Delta flight, departing Tue, 18 Nov from Boston to Seattle, returning Thu, 27 Nov, priced at ฿9,350 found 5 days ago
Delta
Tue, 4 Nov - Tue, 11 Nov
BOS
Boston
SEA
Seattle
฿9,380 Return, found 1 day ago
฿9,380
Return
found 1 day ago
Select Delta flight, departing Tue, 4 Nov from Boston to Seattle, returning Tue, 11 Nov, priced at ฿9,380 found 1 day ago
United
Tue, 4 Nov - Tue, 11 Nov
BOS
Boston
SEA
Seattle
฿9,395 Return, found 1 day ago
฿9,395
Return
found 1 day ago
Select United flight, departing Tue, 4 Nov from Boston to Seattle, returning Tue, 11 Nov, priced at ฿9,395 found 1 day ago
American Airlines
Tue, 4 Nov - Tue, 11 Nov
BOS
Boston
SEA
Seattle
฿9,705 Return, found 1 day ago
฿9,705
Return
found 1 day ago
Select American Airlines flight, departing Tue, 4 Nov from Boston to Seattle, returning Tue, 11 Nov, priced at ฿9,705 found 1 day ago
Alaska Airlines
Mon, 24 Nov - Fri, 28 Nov
BOS
Boston
SEA
Seattle
฿14,715 Return, found 5 days ago
฿14,715
Return
found 5 days ago
Select Alaska Airlines flight, departing Mon, 24 Nov from Boston to Seattle, returning Fri, 28 Nov, priced at ฿14,715 found 5 days ago

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

March is typically the cheapest month to fly

From ฿5,070 - ฿9,964 per traveller.
Flight from Boston to Seattle route information
Origin airport
Logan Intl.
Destination airport
Seattle - Tacoma Intl.
Airlines serving
American Airlines, Delta, United
Return price
฿7,745
Distance
3980 km
Average flight time
3 hours 55 mins

Perfect flights from Boston to Seattle

Embark on an unforgettable journey without breaking the bank with Expedia's incredible deals on cheap flights from Boston to Seattle. Whether you're aching for a romantic escape with your partner, craving an adventurous solo expedition, or yearning to immerse yourself in the local history and culture, we've got you covered.
 
Picture yourself strolling through the streets of , surrounded by breathtaking architecture and absorbing the vibrant atmosphere of this captivating city. Indulge in the mouth-watering local specialties, from tantalizing street food to exquisite fine dining. With Expedia, you can experience all of this and more, without sacrificing your budget.
 
Our flexible Logan Intl. to Seattle - Tacoma Intl. ticket options cater to your travel preferences, with incredible one-way fares from ฿3,850 and roundtrip prices from ฿7,745. Whether you're planning a short city break or a longer adventure, our dynamic pricing ensures that you find the best deals for your journey.
 
But the magic doesn't stop there. Expedia offers a range of partner services to enhance your trip. Rent a car at Seattle - Tacoma Intl. and explore and its surrounding areas at your own pace. Discover hidden gems off the beaten path, and create unforgettable memories. We also provide a handpicked selection of accommodations, from charming bed and breakfasts to luxury hotels, ensuring that you have a comfortable and memorable stay.
 
Planning your next great adventure is a breeze with Expedia. Our user-friendly platform, unbeatable prices, and round-the-clock customer support are designed to make your travel experience seamless and stress-free. So, why wait? Book your to travel arrangements today and embark on the journey of a lifetime in Seattle.

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 ฿7,745. 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.

Explore a world of travel with Expedia

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