CA $128 Cheap Flights from Boston (BOS) to Seattle (SEA)

Popular airlines from Logan International Airport (BOS) to Seattle-Tacoma International Airport (SEA)

  • Plan, book, fly with confidence

  • trending down icon

    Be in the know

    Get alerts if flight prices drop or rise*
  • bex rewards loyalty icon

    Book smarter

    Save up to 30% on select hotels after you book a flight*
  • payments icon

    Earn twice

    Earn your airline miles on top of our rewards

Cheap flights from Boston (BOS) to Seattle (SEA)

Prices were available within the past 7 days and start at CA $128 for one-way flights and CA $258 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
American Airlines
American Airlines
JetBlue Airways
Alaska Airlines
JetBlue Airways
Alaska Airlines
Delta
Delta
Hawaiian Airlines

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

September is typically the cheapest month to fly

From CA $212 - CA $336 per traveller.

Graph displaying average flight prices per month

Flight from Boston to Seattle (BOS - SEA) route information
Origin airport
Logan Intl.
Destination airport
Seattle - Tacoma Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, JetBlue Airways, Sun Country Airlines
Roundtrip price
CA $257
Distance
3980 km
Average flight time
3 hours 23 mins

Boston to Seattle Flights

The easy way to book your flights from Boston to Seattle 

With Expedia, it’s simple to find and book flights to Seattle from Boston whether you’re traveling for business or pleasure. Enter your travel dates, hit search, and choose your flight from 20 airlines that cover this route. There are nonstop flights to Seattle - Tacoma Intl., too.  

Choose your preferred carrier and cabin class with the advanced search tool and select your ideal departure time. Then, if you want, you can see just nonstop or refundable flights. And if you’re traveling last minute, just enter the date to check out flights from Boston to Seattle today, tomorrow, or this week.  

 

Save dollars with cheap flights from Logan Intl., BOS to Seattle - Tacoma Intl., SEA 

Sort your search results by price to find great deals on your flight from Boston to Seattle—you get all your cheapest options first. Grab yourself a bargain now—the lowest price on flights to Seattle from Boston currently is just CA $258 rising to CA $309.  

Here are more money-saving tips: 

  • Fly in September when flight prices are normally at their lowest 
  • Book about a month to 6 weeks before you travel for the best prices to Seattle  
  • Avoid peak season and weekends when flights can cost more
  • Early morning and late-night flights are sometimes cheaper, so try varying your travel times 
  • One surefire way to save money on your flight is to book your flight and hotel together with Expedia. Sometimes, the savings are so large that the flight is basically free! 

 

Reasons to choose Expedia for your flight to Seattle from Boston 

Whatever your destination, budget, or reason to travel, in just one quick search, you can choose from loads of flights, airlines, and cabin classes. The filters make it quick and easy to find your ideal flights, and if you choose one of the flexible options, you won’t be charged to change your flight. So book your flight to Seattle with Expedia today.

Frequently asked questions

How much is a flight from Logan Intl. Airport (BOS) to Sea-Tac Airport?
The lowest price advertised for a round-trip journey between Logan Intl. Airport and Seattle - Tacoma Intl. Airport (SEA) is CA $258. But you better act soon. This price is taken from fares offered within the last 7 days on Expedia for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.
Do I need to pay a cancellation fee if I cancel my flight from Logan Intl. Airport (BOS) to SEA?
Each airline has its own terms and conditions. If you decide to cancel your vacation, visit our Customer Service Portal.
How do I find cheap flights from BOS to Sea-Tac Airport that have flexible change policies?
Flights from BOS to Seattle - Tacoma Intl. Airport (SEA) with flexible change policies are available with many airlines. Simply use our "No change fees" filter while searching. You'll only need to cover the fare difference, without any additional fees to worry about.
How many hours is the flight from Logan Intl. Airport to Seattle - Tacoma Intl. Airport (SEA)?
It takes about 6 hours and 26 minutes to jet from Logan Intl. Airport to Sea-Tac Airport. But with a solid playlist and a few interesting magazines, the hours will go by quicker.
How far is the flight from Logan Intl. Airport to Seattle - Tacoma Intl. Airport (SEA)?
With a flight distance of 4,000 kilometres between Boston and SeaTac, this is a long-haul flight. Remember to drink plenty of water and move your feet and legs every now and then.
Which airlines fly direct from Logan Intl. Airport to Sea-Tac Airport?
With 60 flights a month from Logan Intl. Airport (BOS) to Seattle - Tacoma Intl. Airport (SEA), Delta (DL) is a great choice. Operating 52 flights a month on this route, Alaska Airlines (AS) is another good choice.
Are BOS to Seattle - Tacoma Intl. Airport (SEA) flight tickets cheaper when they're purchased at the last minute?
Late planners can occasionally pick up a bargain, with some of the cheapest airfares from BOS to Seattle - Tacoma Intl. Airport (SEA) popping up a few weeks prior to the departure date. If you'd rather plan ahead of time, Expedia compares and updates all the best flight deals frequently — as early as 12 months in advance in some cases. It does depend on the carrier though, as not every airline releases prices that far in advance.

Explore a world of travel with Expedia

Seattle nearby Airports

Seattle Paine Field Intl. Airport

*Available to Expedia members.