RM623 Cheap Flights from Boston (BOS) to Seattle (SEA)

View RM623 flight on Sat, 6 Jun 2026Opens in a new window

Popular airlines from Boston to Seattle

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Cheap Flights from Boston to Seattle (BOS-SEA)

Prices were available within the past 7 days and start at RM623 for one-way flights and RM1,428 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Sat, 6 Jun - Sun, 14 Jun
BOS
Boston
SEA
Seattle
RM1,428 Return, found 5 days ago
RM1,428
Return
found 5 days ago
Select Delta flight, departing Sat, 6 Jun from Boston to Seattle, returning Sun, 14 Jun, priced at RM1,428 found 5 days ago
Delta
Thu, 12 Feb - Thu, 19 Feb
BOS
Boston
SEA
Seattle
RM1,509 Return, found 2 days ago
RM1,509
Return
found 2 days ago
Select Delta flight, departing Thu, 12 Feb from Boston to Seattle, returning Thu, 19 Feb, priced at RM1,509 found 2 days ago
Delta
Sat, 6 Jun - Sun, 14 Jun
BOS
Boston
SEA
Seattle
RM1,611 Return, found 5 days ago
RM1,611
Return
found 5 days ago
Select Delta flight, departing Sat, 6 Jun from Boston to Seattle, returning Sun, 14 Jun, priced at RM1,611 found 5 days ago
Delta
Sat, 6 Jun - Sun, 14 Jun
BOS
Boston
SEA
Seattle
RM1,631 Return, found 5 days ago
RM1,631
Return
found 5 days ago
Select Delta flight, departing Sat, 6 Jun from Boston to Seattle, returning Sun, 14 Jun, priced at RM1,631 found 5 days ago
United
Sat, 6 Jun - Sun, 14 Jun
BOS
Boston
SEA
Seattle
RM1,673 Return, found 5 days ago
RM1,673
Return
found 5 days ago
Select United flight, departing Sat, 6 Jun from Boston to Seattle, returning Sun, 14 Jun, priced at RM1,673 found 5 days ago
American Airlines
Thu, 12 Feb - Thu, 19 Feb
BOS
Boston
SEA
Seattle
RM1,710 Return, found 2 days ago
RM1,710
Return
found 2 days ago
Select American Airlines flight, departing Thu, 12 Feb from Boston to Seattle, returning Thu, 19 Feb, priced at RM1,710 found 2 days ago
Delta
Thu, 12 Feb - Thu, 19 Feb
BOS
Boston
SEA
Seattle
RM1,712 Return, found 2 days ago
RM1,712
Return
found 2 days ago
Select Delta flight, departing Thu, 12 Feb from Boston to Seattle, returning Thu, 19 Feb, priced at RM1,712 found 2 days ago
American Airlines
Thu, 12 Feb - Thu, 19 Feb
BOS
Boston
SEA
Seattle
RM1,730 Return, found 2 days ago
RM1,730
Return
found 2 days ago
Select American Airlines flight, departing Thu, 12 Feb from Boston to Seattle, returning Thu, 19 Feb, priced at RM1,730 found 2 days ago
American Airlines
Sat, 6 Jun - Sun, 14 Jun
BOS
Boston
SEA
Seattle
RM1,753 Return, found 5 days ago
RM1,753
Return
found 5 days ago
Select American Airlines flight, departing Sat, 6 Jun from Boston to Seattle, returning Sun, 14 Jun, priced at RM1,753 found 5 days ago
American Airlines
Thu, 12 Feb - Thu, 19 Feb
BOS
Boston
SEA
Seattle
RM1,776 Return, found 2 days ago
RM1,776
Return
found 2 days ago
Select American Airlines flight, departing Thu, 12 Feb from Boston to Seattle, returning Thu, 19 Feb, priced at RM1,776 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 RM 647 - RM 1,267 per traveller.

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 RM1,428. 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.

Travel information

Origin airport
Logan Intl.
Destination airport
Seattle - Tacoma Intl.
Return price
RM1,428
Distance
3980 km
Average flight time
4 hours 38 mins

Book with confidence

Perfect flights from Boston to Seattle

Your Journey from Boston to Seattle

Start your unforgettable journey with Expedia. Our broad selection of flights from Boston to Seattle caters to every travel need. Whether you're yearning for a romantic escape, a solo adventure, or a cultural immersion, we've got you covered.
 

Choosing Your Ideal Flight

With Expedia, you have access to a wide range of airlines, including Delta, United, American Airlines. Our selection of flights from Logan Intl. to Seattle - Tacoma Intl. caters to every traveler's requirements, ensuring your journey aligns with your schedule. With options from 20 airlines, you're bound to find the perfect flight.
 

Maximizing Value with Boston to Seattle Flights

Experience the joy of finding cheap flights from Logan Intl. to Seattle - Tacoma Intl. that fit your budget. Keep an eye out for our special deals and discounts, and check our flexible one-way fares from RM623 and roundtrip prices from RM1,428*.
 

Pre-Flight Essentials

Ensure a smooth journey from Boston to Seattle with Expedia. From information about check-in times and in-flight amenities to guidance on baggage policies, we provide all the essentials to prepare you for your flight.
 

Experience the Vibrant Seattle

Picture yourself stepping off the plane in Seattle and immersing yourself in the unique atmosphere of . From local markets to cultural festivals, each city offers its distinct charm. Make the most of your trip by exploring local attractions and indulging in the local cuisine. With Expedia, explore all this and more, tailored to your budget.
 

Added Convenience on Your Boston to Seattle Flight

Traveling with Expedia is more than just a flight. We offer details about in-flight amenities, baggage policies, and more to ensure a smooth and hassle-free journey. Choose from our variety of airlines and embark on a memorable journey from Boston to Seattle.
 

Beyond the Flight – Exploring Seattle

With Expedia, your adventure extends beyond the flight. Explore Seattle at your own pace by renting a car or booking a hotel. Discover hidden gems off the beaten path and create unforgettable memories.
 

Book Your Flight from Boston to Seattle with Confidence

Planning your next great adventure is a breeze with Expedia. Our user-friendly platform, unbeatable prices, and round-the-clock customer support make your travel experience seamless and stress-free. Embark on your journey from Boston to Seattle with confidence. Book your travel arrangements with Expedia today.
 
*Note: Prices may vary based on availability and are subject to change.
Perfect flights from Boston to Seattle

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*Available to Expedia members.