SEA - BOS

C$ 255 Find Cheap Flights from Seattle to Boston – Compare and Save

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Seattle to Boston departing on 27/9. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
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1 adult, Economy, 0 bags

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Everything you should know

Cheapest round-trip
C$ 451
Typical prices: C$ 333-C$ 617
JetBlue
Wed 23/9Sat 3/10
SEA - BOS • Direct
Cheapest direct flights
C$ 466
Typical prices: C$ 349-C$ 586
Alaska Airlines
Sat 5/9Sat 12/9
SEA - BOS • Direct
Advice from real travellers
AI-powered summary based on content written by travel experts and KAYAK users. AI can make mistakes.
JetBlue adds free Wi-Fi for all; Delta limits free Wi-Fi to SkyMiles members.
Delta Comfort Plus and JetBlue Even More Space add legroom on this long flight.
Expert advice
Expert advice
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Expert advice
Expert advice
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Top airlines
Cheapest • from C$ 451 (round-trip)
Best reviews • 7.9 score
Airline reviews
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Direct flights
You can fly direct with Alaska Airlines, Delta, and JetBlue. Average duration is 5h 25m
Direct flights
Direct flights
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Direct flights
Direct flights
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Avoid delays
Most punctual • 89% on-time
Best time • Fewest delays
Insights
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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
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Insights
When to travel
Cheapest • 23% price drop
Most popular
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Flight Deals

Cheap Flights from Seattle to Boston (SEA-BOS)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Seattle to Boston 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 round-trip flight deals from Seattle to Boston

Wed, 23 Sep - Sat, 3 Oct
JetBlue Logo
11:42 p.m. - 8:06 a.m.
SEA
-
BOS
5h 24mdirect
JetBlue Logo
11:20 a.m. - 8:44 p.m.
BOS
-
SEA
12h 24m
1 stop
C$ 451JetBlue
Tue, 13 Oct - Wed, 21 Oct
JetBlue Logo
10:15 p.m. - 10:46 a.m.
SEA
-
BOS
9h 31m
1 stop
JetBlue Logo
6:59 p.m. - 10:38 p.m.
BOS
-
SEA
6h 39mdirect
C$ 451JetBlue
Sat, 10 Oct - Tue, 20 Oct
JetBlue Logo
10:15 p.m. - 10:46 a.m.
SEA
-
BOS
9h 31m
1 stop
JetBlue Logo
6:59 p.m. - 10:38 p.m.
BOS
-
SEA
6h 39mdirect
C$ 451JetBlue
Tue, 22 Sep - Wed, 23 Sep
JetBlue Logo
9:40 p.m. - 10:51 a.m.
SEA
-
BOS
10h 11m
1 stop
JetBlue Logo
7:20 p.m. - 10:37 p.m.
BOS
-
SEA
6h 17mdirect
C$ 451JetBlue
Wed, 2 Sep - Sun, 6 Sep
United Airlines Logo
6:15 p.m. - 5:59 a.m.
SEA
-
BOS
8h 44m
1 stop
United Airlines Logo
10:38 a.m. - 4:07 p.m.
BOS
-
SEA
8h 29m
1 stop
C$ 458United Airlines
Wed, 26 Aug - Sun, 6 Sep
United Airlines Logo
1:57 p.m. - 1:11 a.m.
SEA
-
BOS
8h 14m
1 stop
United Airlines Logo
9:30 a.m. - 4:06 p.m.
BOS
-
SEA
9h 36m
1 stop
C$ 458United Airlines
Fri, 11 Sep - Sat, 19 Sep
United Airlines Logo
10:58 p.m. - 9:52 a.m.
SEA
-
BOS
7h 54m
1 stop
United Airlines Logo
2:28 p.m. - 8:18 p.m.
BOS
-
SEA
8h 50m
1 stop
C$ 458United Airlines
Sat, 5 Sep - Sat, 12 Sep
Alaska Airlines Logo
11:06 p.m. - 7:39 a.m.
SEA
-
BOS
5h 33mdirect
Alaska Airlines Logo
7:59 p.m. - 11:12 p.m.
BOS
-
SEA
6h 13mdirect
C$ 466Alaska Airlines
Sat, 10 Oct - Sat, 10 Oct
Alaska Airlines Logo
7:18 a.m. - 3:55 p.m.
SEA
-
BOS
5h 37mdirect
Alaska Airlines Logo
6:40 p.m. - 9:59 p.m.
BOS
-
SEA
6h 19mdirect
C$ 468Alaska Airlines
Tue, 8 Sep - Wed, 9 Sep
Alaska Airlines Logo
11:06 p.m. - 7:39 a.m.
SEA
-
BOS
5h 33mdirect
Alaska Airlines Logo
10:03 a.m. - 1:15 p.m.
BOS
-
SEA
6h 12mdirect
C$ 468Alaska Airlines
Booking Insights

KAYAK's insights & trends for Seattle to Boston flights

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

How much is a round-trip flight from Seattle to Boston?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Seattle to Boston departing in October.

Flight prices are below average for this route right now.

Flights to Boston from Seattle usually cost between C$ 493 and C$ 776 in October.
The lowest price found in the past 5 days was C$ 451 on JetBlue (10 Oct–17 Oct).

What’s the cheapest day of the week to fly from Seattle to Boston?

The average price of all round-trip flights from Seattle to Boston clicked on KAYAK for each day over the last 12 months.

If your flying dates are flexible, you should consider flying to Boston on a Sunday, as we generally find the cheapest rates on that day for this route. On the other hand, Saturday is the most expensive day to fly from Seattle to Boston. For your return ticket, we recommend flying on a Saturday and avoiding Thursdays for the best deals.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Seattle to Boston, 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 Seattle to Boston is September, where tickets cost C$ 453 (return) on average. On the other hand, the most expensive months are December and April, where the average cost of round-trip tickets is C$ 755 and C$ 686 respectively.

Can I save money by flying with a layover from Seattle to Boston?

The average round-trip price for all non-stop flights, flights with one layover, and flights with two layovers for the route found by users searching on KAYAK in the last 2 weeks.

No, with an average price for the route of C$ 586, prices are generally cheapest when you fly direct.

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Seattle to Boston, 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 Seattle to Boston, 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 7 weeks before departure.

Expert advice

Expert advice for your flight from Seattle to Boston

 
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
Stefanie Waldek

Stefanie Waldek

Expert on Delta

Stefanie Waldek is a freelance space, travel, and design writer based in Saratoga Springs, NY. Her words have appeared in Space.com, Travel + Leisure, Condé Nast Traveler, Architectural Digest, and House Beautiful, among other publications. An expert in aviation and expedition cruising, Stefanie is frequently up in the air or on the sea, likely en route to Antarctica or the Arctic.

Harriet Baskas

Harriet Baskas

Expert on JetBlue, Alaska Airlines and 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, USA TODAY, 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.

Blane Bachelor

Blane Bachelor

Expert on BOS

Blane Bachelor is a journalist and editor specializing 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 favorite 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. She will always choose the window seat.

Good to know

Low season

January

Cheapest flight

C$ 255
Best time to beat the crowds (4% less expensive on average)
Most popular time to fly (28% more expensive on average)
Flight from Seattle to Boston

When to book flights from Seattle to Boston

Are your dates flexible? Find out the best times to travel from Seattle to Boston based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips 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 Seattle to Boston: the best tips from KAYAK users' own experiences

Insights shared by verified travellers who flew the route from Seattle to Boston 
rsmrostovFlew with Alaska Airlines
SEA
-
BOS
Jan 2026
If you have a small personal bag and a personal item you will be hustled to consolidate snacks on the flight of very poor so bring your own food and if you have an Android phone you likely will have issues connecting to Wi-Fi on the plane especially if the connection was dropped in the middle of watching a movie and then you attempt to reinstate it sometimes you have to clear browsing history and cookies becomes painful
Verified travelerFlew with Alaska Airlines
SEA
-
BOS
Jul 2024
Generally Alaska Airlines have very friendly and helpful people in my experience. They don’t have TVs in all planes so make sure to download their app if you want entertainment on the plane.

FAQs for booking flights from Seattle to Boston

  • Where can I find bus services at Logan airport?

    Moving around the Logan airport is the least of your worries since the airport provides free bus services. They ferry travelers to various spots at varying intervals. The buses are easy to board and to load luggage, thanks to their low floors. They also have a wheelchair lift, making them friendly to the disabled. You’ll find them to the south of each terminal.

  • What assistance can I get at the Seattle airport?

    The airport works toward giving travelers a memorable experience when waiting for their flights. You can find advanced facilities and welcoming staff to help you move around and offer you all the assistance needed. The disabled can access wheelchair services, which the airport provides at no cost upon making a reservation.

  • How fast can I get accommodation upon landing at Logan airport?

    You can get accommodation near Logan airport for approximately $144. Take a free shuttle bus at the terminals to access hotels such as the Homewood Suites, located 3.5 miles away. Enjoy an indoor pool table, Wi-Fi, and a fitness center. The hotel serves complimentary breakfast too.

  • What can keep me busy as I wait for my flight to Seattle Airport?

    Travelers can enjoy a walking tour to explore attractions in the neighborhood using underground paths and learn about the history. Waiting for your flight does not have to be boring, as there is too much fun around the airport.

  • What is the cheapest flight from Seattle to Boston?

    In the last 5 days, the lowest price for a flight from Seattle to Boston was C$ 255 for a one-way ticket and C$ 451 for a round-trip.

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

    All the following airlines offer inflight Wi-Fi service on the Seattle to Boston flight route: JetBlue, Alaska Airlines, Delta, Iberia, KLM, Scandinavian Airlines, Virgin Atlantic, and Air France.

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

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

  • Which airline alliances offer flights from Seattle to Boston?

    oneworld is the only airline alliance operating flights between Seattle and Boston.

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

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

  • Which is the best airline for flights from Seattle to Boston, Alaska Airlines or JetBlue?

    The two airlines most popular with KAYAK users for flights from Seattle to Boston are Alaska Airlines and JetBlue. With an average price for the route of C$ 685 and an overall rating of 7.9, Alaska Airlines is the most popular choice. JetBlue is also a great choice for the route, with an average price of C$ 467 and an overall rating of 7.1.

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

    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 Seattle to Boston.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Boston from Seattle 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 Seattle to Boston?

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

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

    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 Boston from Seattle up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

KAYAK’s top tips for finding a cheap flight from Seattle to Boston

  • Looking for a cheap flight? 25% of our users found flights on this route for C$ 279 or less one-way and C$ 559 or less round-trip.
  • Seattle International Airport offers tranquil air services to travelers flying to Boston. You can book one among the several nonstop flights and land at Logan International Airport. Airlines operating on this route include Alaska and American Airlines.
  • If you are departing from Seattle airport, you can park your car and fly with your keys. You’ll find dedicated staff to assist you in parking and even carry your bags to the airport. What more, you enjoy a complimentary bottle of water as you head to the terminals.
  • While at Seattle airport, you can enjoy free Wi-Fi and take snacks and drinks at the elegant lounges that the facility has to offer. You can book your lounge tickets that cost around $49. At Courtyard A, you’ll find the Club Sea lounge that serves beer and other beverages.
  • Seattle airport features multiple artistic works that include photography, sculpture, and painting, among others. Travelers can explore creative artwork by reputable artists such as Robert Rauschenberg.
  • Travelers enjoy a variety of dining services as they wait to depart from Seattle International Airport. There are gift shops, fashion brands, and duty-free services offered at the waiting halls.
  • For those travelers with young kids, Seattle airport provides nursing rooms located in various areas. Find one in the Children Play Area at Concourse A. Another nursing room exists in Concourse D next to D24. You’ll also find one above checkpoint 3.
  • Travelers landing at Logan International Airport can access the United Club lounge located in Terminal B at $59 for adults. The lounge serves drinks, premium food, snacks, and breakfast. Other services include printing, photocopies, and free Wi-Fi.

Prefer to fly direct from Seattle to Boston?

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

Direct departures

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 nonstop flights

Direct returns

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 nonstop flights

Reviews of the top airlines flying from Seattle to Boston

 
See real verified KAYAK customer reviews for airlines flying from Seattle to Boston. 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 Seattle to Boston? 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.
7.9
Alaska AirlinesOverall score based on 12731 reviews
8.1Boarding
7.8Comfort
7.0Food
8.5Crew
7.0Entertainment
Airline reviews

Thank you to everyone, the crew and pilots.. they were so amazing!!

10.0 ExcellentAngel, May 2026
SEA - BOS
Read more Alaska Airlines reviews

Thank you to everyone, the crew and pilots.. they were so amazing!!

Plane was clean, staff was professional and flight was on time. No built in tv was still ok, as programs were offered that could synch to smart phones.

J was in the ER x 3...3 protruding discs...contacted Alaska many many days prior to cancel and request a refund or a credjt.. they only gave me 50 % credit....outrageous seeing how i have a doctors letter....just plain inhuman. AI sucks!

There is nothing critical to complain about but I would say the snacks are pretty bad Airline staff could be aggressive the way they move through the aisles and the plane I also got hustled for a small wallet size men bag and force the consolidated with my carry on item we're talking about a wallet size bag.

I don’t want to pay extra to choose my seat

No food, just a snack on a Seattle to Boston flight? VERY chintzy.

5 gate changes, 3 terminal changes and 1 plane change. We had boarded and there was a water leak in the lavatory which they couldn't fix. So we deplaned. 3 hour late departure. Never again!

It was fine. The flight was about 45-60 mins late boarding and taking off which made us miss some plans in the morning and bags took forever to get to us but that’s Logan’s fault

The employee handling boarding of the plane had such a strong accent that I don't think anyone could understand a word she said. Other than that, everything was fine. The seats in coach class are too narrow (even for a small person like me), and it would really help to have pillows available on an overnight flight.

Whoever the lady was who helped me check my bags in at the kiosk was amazing. She had red hair and was maybe 5'2" or so. I never got her name, but she was an infinity sign on a scale of 1-10.

Separated a pair of family members(father and teenage daughter) on all legs of the flight that were booked together, just to create an upsell. Food was horrible and only catered to vegetarians and gluten free crowd. I’d rather give more of my money to another straight shooting airline.

A nightmare. Scheduled flight delayed 2 hours then cancelled because pilot timed out . Unable to find another pilot. Really?! Weather certainly a factor, but JetBlue seemed totally unprepared for the chaos that ensued when flight routes were cancelled. More cancelled flights, finally many of us who had been bumped from other flights were allowed to board a Boston bound plane around 3:00am, delay after delay, sat on tarmac for another half hour while pilot dealt with weight distribution issues (?), arrived in Boston 4:30. Crew were wonderful- same attendants all day and night and they were exhausted. Fortunately for me and my son that Boston was our final destination, not so lucky for many who missed connecting flights.

The flight was delayed 14 hours and communication was very poor. No one seemed to know what was happening and the gate agent was trying to help people for several flights. She was by herself trying to help 100s of people.

JetBlue worker, Blythe, was so amazing at the DCA counter. If it wasn’t for her, I’m not sure we would’ve made it through. Please thank her!

The flight out was delayed from 3:40pm to 5pm and again to 8pm. We boarded after 5pm, had to disembark because they could not get the Engine started, then we switched gates and got a new plane and did not board until after 8pm.

This was the first flight I've taken since pre-pandemic. I was pleased with how orderly the boarding and disembarking went. The seats were comfortable. I loved that there was no "first class'. The attendants and passengers I met were all very friendly and welcoming.

There was a screen but no earphones that could use the older input so I could listen to anything.

The plane was late to leave.. Internet was lousy. TV was not working. when we arrived, We stayed on the plane for a long time before we got to the gate. It took us a long time to retrieve our luggage because they didn’t know what carousel to send them to. It was a bad experience.

Seats were not too comfortable; it was impossible to locate the underseat power outlet.

It was too hot in the cabin. The AC did not help.

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

Information on your arrival and departure airports