฿3,855 Cheap Flights from Boston (BOS) to Seattle (SEA)

View ฿3,855 flight on Wed, 24 Sept 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 ฿3,855 for one-way flights and ฿7,705 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Tue, 23 Sept - Fri, 26 Sept
BOS
Boston
SEA
Seattle
฿7,705 Return, found 5 days ago
฿7,705
Return
found 5 days ago
Select Delta flight, departing Tue, 23 Sept from Boston to Seattle, returning Fri, 26 Sept, priced at ฿7,705 found 5 days ago
Delta
Tue, 23 Sept - Wed, 1 Oct
BOS
Boston
SEA
Seattle
฿8,840 Return, found 5 days ago
฿8,840
Return
found 5 days ago
Select Delta flight, departing Tue, 23 Sept from Boston to Seattle, returning Wed, 1 Oct, priced at ฿8,840 found 5 days ago
Delta
Sun, 21 Sept - Fri, 26 Sept
BOS
Boston
SEA
Seattle
฿9,490 Return, found 5 days ago
฿9,490
Return
found 5 days ago
Select Delta flight, departing Sun, 21 Sept from Boston to Seattle, returning Fri, 26 Sept, priced at ฿9,490 found 5 days ago
Delta
Thu, 25 Sept - Wed, 1 Oct
BOS
Boston
SEA
Seattle
฿9,650 Return, found 3 days ago
฿9,650
Return
found 3 days ago
Select Delta flight, departing Thu, 25 Sept from Boston to Seattle, returning Wed, 1 Oct, priced at ฿9,650 found 3 days ago
Delta
Thu, 25 Sept - Wed, 1 Oct
BOS
Boston
SEA
Seattle
฿9,975 Return, found 3 days ago
฿9,975
Return
found 3 days ago
Select Delta flight, departing Thu, 25 Sept from Boston to Seattle, returning Wed, 1 Oct, priced at ฿9,975 found 3 days ago
American Airlines
Fri, 17 Oct - Thu, 23 Oct
BOS
Boston
SEA
Seattle
฿9,980 Return, found 6 days ago
฿9,980
Return
found 6 days ago
Select American Airlines flight, departing Fri, 17 Oct from Boston to Seattle, returning Thu, 23 Oct, priced at ฿9,980 found 6 days ago
Delta
Fri, 17 Oct - Thu, 23 Oct
BOS
Boston
SEA
Seattle
฿9,990 Return, found 6 days ago
฿9,990
Return
found 6 days ago
Select Delta flight, departing Fri, 17 Oct from Boston to Seattle, returning Thu, 23 Oct, priced at ฿9,990 found 6 days ago
United
Thu, 25 Sept - Wed, 1 Oct
BOS
Boston
SEA
Seattle
฿10,140 Return, found 3 days ago
฿10,140
Return
found 3 days ago
Select United flight, departing Thu, 25 Sept from Boston to Seattle, returning Wed, 1 Oct, priced at ฿10,140 found 3 days ago
Delta
Fri, 17 Oct - Thu, 23 Oct
BOS
Boston
SEA
Seattle
฿10,310 Return, found 6 days ago
฿10,310
Return
found 6 days ago
Select Delta flight, departing Fri, 17 Oct from Boston to Seattle, returning Thu, 23 Oct, priced at ฿10,310 found 6 days ago
JetBlue Airways
Wed, 24 Sept - Thu, 25 Sept
BOS
Boston
SEA
Seattle
฿10,590 Return, found 5 days ago
฿10,590
Return
found 5 days ago
Select JetBlue Airways flight, departing Wed, 24 Sept from Boston to Seattle, returning Thu, 25 Sept, priced at ฿10,590 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 ฿4,961 - ฿9,749 per traveller.
Flight from Boston to Seattle route information
Origin airport
Logan Intl.
Destination airport
Seattle - Tacoma Intl.
Return price
฿7,705
Distance
3980 km
Average flight time
3 hours 15 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 ฿3,855 and roundtrip prices from ฿7,705. 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 ฿7,705. 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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