BOS - SEA

Find Cheap Flights from Boston to Seattle – Compare and Save

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1 adult, Economy, 0 bags

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Everything you should know

Advice from real travellers
AI-powered summary based on content written by travel experts and KAYAK users. AI can make mistakes.
Alaska's nonstop from Boston to Seattle is valued for smooth, on-time service.
Pay extra for seat selection on full flights; pre-order snacks if desired.
Expert advice
Expert advice
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Direct flights
Every day
You can fly direct with Alaska Airlines, Delta, and JetBlue. Average duration is 6h 22m
Direct flights
Direct flights
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Direct flights
Direct flights
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Avoid delays
Most punctual • 85% on-time
Best time • Fewest delays
Insights
Insights
Insights
Insights
When to book
in advance
Our data shows that travellers who book at least 3 weeks in advance save around 34% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
Cheapest • 18% price drop
Most popular
Good to know
Good to know
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KAYAK searches hundreds of sites at once to find you the best travel deals.
We hope you love your trip to Seattle!
Flight Deals
Booking Insights
Expert advice
Flight Deals

Cheap Flights from Boston to Seattle (BOS-SEA)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for return flights from Boston to Seattle that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent return flight deals from Boston to Seattle

Multiple Airlines Logo
BOS
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SEA
2487 mimulti-stop
Multiple Airlines Logo
SEA
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BOS
2487 mimulti-stop
Multiple Airlines
Booking Insights

KAYAK’s insights & trends for Boston to Seattle flights

Get data-powered insights and trends into flights from Boston to Seattle to help you find the cheapest flights, the best time to fly and much more.

What is the cheapest month to fly from Boston to Seattle?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Boston to Seattle, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Boston to Seattle is October, where tickets cost £252 (return) on average. On the other hand, the most expensive months are December and July, where the average cost of round-trip tickets is £395 and £354 respectively.

How far in advance should I book a flight from Boston to Seattle?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Boston to Seattle, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from Boston to Seattle, you should book around 3 weeks before departure, which saves you about 34% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 9 weeks before departure.

Expert advice

Expert advice for your flight from Boston to Seattle

 
AI-powered summary based on content written by travel experts. AI can make mistakes.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Our travel experts
Blane Bachelor

Blane Bachelor

Expert on BOS

Blane Bachelor is a journalist and editor specialising in travel and aviation who writes regularly for top global outlets. Born and raised in Florida, Blane has worked and lived in four countries, including the Netherlands, where she’s currently based with her family. Her favourite way to get to know a new destination is by running or riding a bike around town – or hearing a spooky ghost story about local history.

Harriet Baskas

Harriet Baskas

Expert on SEA

Harriet is an award-winning journalist who is happiest in an airport or an unusual museum. Her stories about airports, air travel, and the business of travel have appeared on NBC News, CNBC, The Points Guy, and other outlets. She is the creator of the StuckatTheAirport.com blog and the author of nine books. When not out on the road or exploring the latest airport amenities, she’s home in Seattle getting ready for the next adventure.

Good to know - Cheap tickets from Boston to Seattle

Low season

January
Best time to beat the crowds (10% less expensive on average)
Most popular time to fly (15% more expensive on average)

When to book flights from Boston to Seattle

Are your dates flexible? Find out the best times to travel from Boston to Seattle based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated return price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or returns with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

Flights from Boston to Seattle: the best tips from KAYAK users' own experiences

Insights shared by verified travellers who flew the route from Boston to Seattle 
Verified travelerFlew with Alaska Airlines
BOS
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SEA
Mar 2026
Other smaller airports in the area may be more convenient, but the nonstop from Logan and the red-eye from Seattle suit me better than switching to connecting flights.
Verified travelerFlew with Alaska Airlines
BOS
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SEA
Oct 2024
Flying Alaska Airlines from Boston to Seattle was an example of getting exactly what you expect. A no-frills basic experience, but one where the important things were accomplished, timely departure, on-time arrival, no drama, no glitches, completely as anticipated. I paid a little extra for one offered perk (seat selection), and I'm glad I did because my early morning flight was full. Next time, I'll likely pre-order a snack, since they looked good, were served promptly, and are priced right.
CarlaFlew with Alaska Airlines
BOS
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SEA
May 2024
It’s a good choice. Seattle airport is huge and confusing if you are changing planes. Have plenty of time to switch.

FAQs for booking flights from Boston to Seattle

  • Which airlines offer Wi-Fi service onboard planes from Boston to Seattle?

    JetBlue, Alaska Airlines, Delta, and American Airlines offer inflight Wi-Fi service on the Boston to Seattle flight route.

  • Which aircraft models fly most regularly from Boston to Seattle?

    The Airbus A321-100/200 is the aircraft model that flies most regularly on the Boston to Seattle flight route.

  • On which days can I fly direct from Boston to Seattle?

    There are direct flights from Boston to Seattle on a daily basis.

  • How does KAYAK find such low prices on flights from Boston to Seattle?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Boston to Seattle.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Boston to Seattle?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Seattle from Boston is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Boston to Seattle?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional return ticket. You could then fly to Seattle with an airline and back to Boston with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Boston to Seattle?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Seattle from Boston up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Prefer to fly direct from Boston to Seattle?

 
Direct data is based off flight results for the next 60 days. Find direct flights from all airlines flying direct from Boston Logan Intl to Seattle/Tacoma Intl.
Find which airlines fly direct from Boston Logan Intl Airport to Seattle/Tacoma Intl Airport, which days they fly and book direct flights.

Direct departures

Boston Logan Intl to Seattle/Tacoma Intl

Monday

Alaska Airlines,Delta,JetBlue

Alaska Airlines,Delta, +1 more

Tuesday

Alaska Airlines,Delta,JetBlue

Alaska Airlines,Delta, +1 more

Wednesday

Alaska Airlines,Delta,JetBlue

Alaska Airlines,Delta, +1 more

Thursday

Alaska Airlines,Delta,JetBlue

Alaska Airlines,Delta, +1 more

Friday

Alaska Airlines,Delta,JetBlue

Alaska Airlines,Delta, +1 more

Saturday

Alaska Airlines,Delta,JetBlue

Alaska Airlines,Delta, +1 more

Sunday

Alaska Airlines,Delta,JetBlue

Alaska Airlines,Delta, +1 more

See more direct flights

Direct returns

Seattle/Tacoma Intl to Boston Logan Intl

Monday

Alaska Airlines,Delta,JetBlue

Alaska Airlines,Delta, +1 more

Tuesday

Alaska Airlines,Delta,JetBlue

Alaska Airlines,Delta, +1 more

Wednesday

Alaska Airlines,Delta,JetBlue

Alaska Airlines,Delta, +1 more

Thursday

Alaska Airlines,Delta,JetBlue

Alaska Airlines,Delta, +1 more

Friday

Alaska Airlines,Delta,JetBlue

Alaska Airlines,Delta, +1 more

Saturday

Alaska Airlines,Delta,JetBlue

Alaska Airlines,Delta, +1 more

Sunday

Alaska Airlines,Delta,JetBlue

Alaska Airlines,Delta, +1 more

See more direct flights

Reviews of the top airline flying from Boston to Seattle

 
See real verified KAYAK customer reviews for airlines flying from Boston to Seattle. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Boston to Seattle? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.1
JetBlueOverall score based on 3030 reviews
7.5Comfort
7.9Crew
7.2Entertainment
6.6Food
7.3Boarding
Airline reviews

Flight delayed 4 times on a non-stop from BOS to SFO. Then when landed in SFO had to wait for 30 mins for a gate AT 3:30AM.

2.0 MediocreKeith, Jul 2026
BOS - SFO
Read more JetBlue reviews

Flight delayed 4 times on a non-stop from BOS to SFO. Then when landed in SFO had to wait for 30 mins for a gate AT 3:30AM.

Horrible - for the first time in my life i was denied boarding an international flight because the name used on my ticket - Josh - was not exactly the same as my passport - Joshua. At no time during ticketing, online check-in, or at the airport flying from Boston to NY was i notified of a problem. It was only at boarding from NY to Costa Rica I was informed of the problem and by then it was too late. After missing the flight I was told by airport Jet Blue staff, including a supervisor, that it was my problem and they could not assist because i bought "the cheapest fare". i was hung up on twice by JetBlue customer service, including once by a supervisor. I blame Kayak and your awful partner ChatDeal for even allowing me to purchase an international ticket without verifying this - you effectively sold me a ticket i could not use. Shame on you and shame on ChatDeal for doing nothing to help me resolve the situation. What a scam.

The flight kept getting delayed, but the ground crew did not communicate well to the passengers in the terminal. First, we were told that it was an engine issue. That was understandable. We asked, after the third delay, if it would be canceled; they reassured us that that would not happen because a new plane was on its way from Washington DC. Four hours later, that is exactly what happened. No announcement was made only people who had the JetBlue app learned of the cancellation. They rebooked us on a flight that would get into our destination 36 hours after our original time I had to spend an exorbitant amount of money to book an additional flight with a different airline, the following morning in order to make it to my conference in time. Not to mention the fact that by the time I discovered the cancellation on the departures board, it was too late for me to receive a refund on my lodging in the destination city for that night. Because I had booked with KAYAK, I did not receive any JetBlue email with rebooking information. This is what the information information desk kept telling everyone who inquired about a rebooking. This was my first time flying with JetBlue. Needless to say, after extremely poor communication andover $1000 of additional expense later, I will not be flying with them again.

We were several hours delayed due to confusion during boarding. Evidently the crew could not match the manifest with the boarded customers. After significant time trying to find individuals on board, a crew member walked through the entire plane re-scanning each of our boarding passes. Then we had to wait for a new slot to depart, and when we landed, our gate was not ready. It was a complete goat rodeo from start to finish.

Horrible. Flight was cancelled, jet blue app not working to rebook, no phone number available to call Jet Blue, 400 ish people in line for the help desk, stuck in Boston for 2 more days had to book new flight with a different airline and still not sure if I will be able to get any refund.

Flight left 2 hours late with no explanation as to the delay

Whole experience was poor. Delayed 2 hours. Lied about the delays. Was all jet blues fault and tried to blame on air traffic control. Sent out other let trips and wouldn't allow people to switch aircraft.

My bag was not loaded on my flight. it was not communicated to me until i was waiting for my bag at my destination. there was no confirmation of when my bag was arriving and no way to track it.

The gate attendant in Boston had a high raspy voice and spoke much too fast to be understood. Not pleasant.

It was fine for what it was. It’s not luxury travel but it was efficient, for the most part. Having my carry-on transferred into luggage however, was unwelcome.

Everything you need to know for your flight from Boston to Seattle

Information on your arrival and departure airports