SEA - BOS

C$ 172 Find Cheap Flights from Seattle to Boston

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 9/5. 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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KAYAK searches hundreds of travel sites at once for deals on flights to Boston

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Seattle to Boston, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Seattle to Boston, as well as popular online travel agencies
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Cheap Flight Deals 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.

Recent round-trip flight deals from Seattle to Boston

KAYAK's recommended round-trip deals from the most popular airlines that fly from Seattle to Boston.
Discover the best prices for you by selecting your travel dates on KAYAK.
Choose your dates
JetBlue Logo
11:38 a.m. - 8:10 p.m.SEA-BOS
5h 32mdirect
JetBlue Logo
7:10 a.m. - 10:28 a.m.BOS-SEA
6h 18mdirect
C$ 341JetBlue
Find Deal
Fri, 9 May - Thu, 15 May
Hawaiian Airlines Logo
3:40 p.m. - 12:06 a.m.SEA-BOS
5h 26mdirect
Hawaiian Airlines Logo
7:30 a.m. - 10:40 a.m.BOS-SEA
6h 10mdirect
C$ 342Hawaiian Airlines
Find Deal
Fri, 30 May - Wed, 4 Jun
Alaska Airlines Logo
9:28 p.m. - 4:15 p.m.SEA-BOS
15h 47m1 stop
Alaska Airlines Logo
7:30 a.m. - 10:40 a.m.BOS-SEA
6h 10mdirect
C$ 356Alaska Airlines
Find Deal
Fri, 9 May - Thu, 15 May
Delta Logo
10:11 p.m. - 6:40 a.m.SEA-BOS
5h 29mdirect
Delta Logo
6:56 p.m. - 10:22 p.m.BOS-SEA
6h 26mdirect
C$ 363Delta
Find Deal
Sat, 7 Jun - Sat, 14 Jun
Alaska Airlines Logo
6:59 p.m. - 7:40 a.m.SEA-BOS
9h 41m1 stop
Alaska Airlines Logo
8:40 a.m. - 6:51 p.m.BOS-SEA
13h 11m1 stop
C$ 370Alaska Airlines
Find Deal
Tue, 27 May - Wed, 4 Jun
United Airlines Logo
12:55 p.m. - 11:59 p.m.SEA-BOS
8h 04m1 stop
United Airlines Logo
6:00 a.m. - 11:25 a.m.BOS-SEA
8h 25m1 stop
C$ 400United Airlines
Find Deal
Mon, 19 May - Tue, 20 May
Delta Logo
7:25 a.m. - 4:00 p.m.SEA-BOS
5h 35mdirect
Delta Logo
7:07 p.m. - 10:21 p.m.BOS-SEA
6h 14mdirect
C$ 418Delta
Find Deal
Fri, 9 May - Thu, 15 May
United Airlines Logo
11:25 p.m. - 9:56 a.m.SEA-BOS
7h 31m1 stop
United Airlines Logo
2:40 p.m. - 8:42 p.m.BOS-SEA
9h 02m1 stop
C$ 453United Airlines
Find Deal
Wed, 1 Oct - Sat, 4 Oct
Sun Country Air Logo
11:59 p.m. - 10:42 a.m.SEA-BOS
7h 43m1 stop
Sun Country Air Logo
8:30 a.m. - 8:08 a.m.BOS-SEA
26h 38m1 stop
C$ 492Sun Country Air
Find Deal
Thu, 29 May - Sun, 1 Jun
Sun Country Air Logo
12:15 p.m. - 10:37 a.m.SEA-BOS
19h 22m1 stop
Sun Country Air Logo
6:30 a.m. - 5:02 p.m.BOS-SEA
13h 32m1 stop
C$ 609Sun Country Air
Find Deal
Tue, 10 Jun - Mon, 16 Jun

Expert advice for your flight from Seattle to Boston

 
Snippets provided in this section are AI-generated based on a summarization of KAYAK-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are specific to the author and reflect their authentic experience, which may vary significantly from the experience of others.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Airlines
Alaska Airlines

Alaska Airlines offers a 20-minute baggage guarantee for quick baggage claim.


Alaska Airlines' Premium Class offers priority boarding and complimentary drinks on flights over 350 miles.

Delta

Delta's Comfort Plus seats offer up to 8 cm extra legroom for added comfort.


Delta offers free Wi-Fi for SkyMiles members on domestic flights, enhancing connectivity.

Read more about Deltaby Stefanie Waldek
JetBlue

JetBlue provides free gate-to-gate Wi-Fi and unlimited snacks for all passengers.


JetBlue's Even More Space seats offer up to 18 cm extra legroom and priority boarding.

Read more about JetBlueby Harriet Baskas
Airports
SEA

Use the SEA Spot Saver for expedited security screening, available daily from 4 a.m. to 10 p.m. at Checkpoints 2, 3, and 5.

Read more about SEAby Harriet Baskas
BOS

The Silver Line bus is free from BOS to South Station, taking 20-30 minutes depending on traffic.

Read more about BOSby Blane Bachelor
Our travel experts
Harriet Baskas

Harriet Baskas

Expert on Alaska Airlines, JetBlue and SEA

Harriet Baskas

Harriet Baskas

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.

Read more
Stefanie Waldek

Stefanie Waldek

Expert on Delta

Stefanie Waldek

Stefanie Waldek

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.

Read more
Blane Bachelor

Blane Bachelor

Expert on BOS

Blane Bachelor

Blane Bachelor

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.

Read more

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.

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 Wednesday, as we generally find the cheapest rates on that day for this route. On the other hand, Monday is the most expensive day to fly from Seattle to Boston. For your return ticket, we recommend flying on a Wednesday and avoiding Sundays 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 January, where tickets cost C$ 301 (return) on average. On the other hand, the most expensive months are July and June, where the average cost of round-trip tickets is C$ 744 and C$ 688 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$ 801, 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. For the absolute cheapest price, our data suggests you should book 14 weeks before departure.

Good to know

Low season

February

High season

August

Cheapest flight

C$ 172
Best time to beat the crowds (25% less expensive on average)
Most popular time to fly (32% 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.

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 3 days, the lowest price for a flight from Seattle to Boston was C$ 124 for a one-way ticket and C$ 246 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, Hawaiian Airlines, American Airlines, Delta, and Virgin Atlantic.

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

    The Airbus A321neo 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, SkyTeam, and Star Alliance are the airline alliances operating flights between Seattle and Boston, with SkyTeam being the most commonly used for this route.

  • 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 Delta?

    The two airlines most popular with KAYAK users for flights from Seattle to Boston are Alaska Airlines and Delta. With an average price for the route of C$ 554 and an overall rating of 8.0, Alaska Airlines is the most popular choice. Delta is also a great choice for the route, with an average price of C$ 451 and an overall rating of 8.0.

  • 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.

See more FAQs

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$ 219 or less one-way and C$ 349 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.
See more tips

Prefer to fly direct from Seattle to Boston?

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

Air France,Air Tahiti Nui,Alaska Airlines, +15 more

Air France,Air Tahiti Nui, +16 more

Tuesday

Air France,Air Tahiti Nui,Alaska Airlines, +16 more

Air France,Air Tahiti Nui, +17 more

Wednesday

Air France,Air Tahiti Nui,Alaska Airlines, +15 more

Air France,Air Tahiti Nui, +16 more

Thursday

Air France,Air Tahiti Nui,Alaska Airlines, +16 more

Air France,Air Tahiti Nui, +17 more

Friday

Air France,Air Tahiti Nui,Alaska Airlines, +16 more

Air France,Air Tahiti Nui, +17 more

Saturday

Air France,Air Tahiti Nui,Alaska Airlines, +17 more

Air France,Air Tahiti Nui, +18 more

Sunday

Air France,Air Tahiti Nui,Alaska Airlines, +16 more

Air France,Air Tahiti Nui, +17 more

See more nonstop flights

Direct returns

Boston Logan Intl to Seattle/Tacoma Intl

Monday

Air France,Air Tahiti Nui,Alaska Airlines, +18 more

Air France,Air Tahiti Nui, +19 more

Tuesday

Air France,Air Tahiti Nui,Alaska Airlines, +16 more

Air France,Air Tahiti Nui, +17 more

Wednesday

Air France,Air Tahiti Nui,Alaska Airlines, +17 more

Air France,Air Tahiti Nui, +18 more

Thursday

Air France,Air Tahiti Nui,Alaska Airlines, +19 more

Air France,Air Tahiti Nui, +20 more

Friday

Air France,Air Tahiti Nui,Alaska Airlines, +15 more

Air France,Air Tahiti Nui, +16 more

Saturday

Air France,Air Tahiti Nui,Alaska Airlines, +16 more

Air France,Air Tahiti Nui, +17 more

Sunday

Air France,Air Tahiti Nui,Alaska Airlines, +18 more

Air France,Air Tahiti Nui, +19 more

See more nonstop flights
See more nonstop flights

Top 3 airlines serving 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.
8.0
Alaska AirlinesOverall score based on 9918 reviews
7.9Comfort
8.2Boarding
7.1Entertainment
8.5Crew
7.1Food
Airline reviews

Three hour flight so snacks and basic drinks unless you pre buy as usual. Didn’t do my emtertainment as was tired after 23 hours of travel. You have to use your own device on US flights if travelers aren’t aware so if you only use your cell phone that can be small. Crew are great.

8.0 ExcellentJan, Apr 2025SEA - ANC
Read more Alaska Airlines reviews

Three hour flight so snacks and basic drinks unless you pre buy as usual. Didn’t do my emtertainment as was tired after 23 hours of travel. You have to use your own device on US flights if travelers aren’t aware so if you only use your cell phone that can be small. Crew are great.

Awful. We got the last seats and they don't recline. We've been on this horrible journey since 6am and won't get to our destination almost a full day later. Oh and no food, either. Never again.

An uneventful flight is a good experience although one of the pilots gauges wasn’t working right so we had a half hour delay—no one can foresee that.

Plane was delayed and got me in past bedtime. But more importantly, my tsa precheck number wasn’t on my ticket so had to deal with the general line. Oh well, guess the delay helped that situation.

It was as good as flying can be, which is still very uncomfortable. Clean new aircraft, great crew.

Everything was good. The flight attendants were great. I was disappointed that there wasn’t any screens on the back of the seats to watch movies, tv, etc. I only had my phone to watch movies on.

Flight delayed due to engine issue. For 3+ hours still not on flight

Could have had more of a beverage selection than water and apple juice.

They only had one flight to my destination for the entire day. Six hour layover. Coming from their sister airline we didn't have any boarding grouping on our boarding tickets. Had to ask where we were within the grouping.

Flight was over an hour late, and we got notified every 15 minutes, beginning right at boarding, that it would only be 15 more minutes until we finally left about 75 minutes late. Of course, no compensation was offered.

Delta is a cut above the others in customer service.

Simply outstanding. Their new lounge for Delta One customers is a cut above the rest.

Great staff. Wifi is terrible. Signing up for skylines is a painstaking process. Had to call customer service just to get my flight itinerary and confirmation sent to me. Consistent delays. A well staffed company that is run so poorly. Upper management needs to be renewed.

The crew was wonderful and attentive. The seats near exit row were restrictive. Offer healthy snacks please

Newer plane, relatively easy boarding, not a full flight and was told that we could not be moved up because of weight and balance issues. Otherwise, a very good experience.

Other then mechanical/ computer problem and 3.5 hours flight delay the flight was great. I guess that what happened when you fly an old airplane now a day.

I think they can provide the better food/snack option for the 4 hours flight. Drinks are fine.

It was terrible, if they ran flights on time it would make a big difference.

The food was good. I ate gnocchi with marinara sauce and cheese, salted caramel tiramisu. And later in the trip cheese calzone. I watched 3 movies. The selection is really good. Have new and old movies. The flight attendances were nice and cordially. Overall the 6 hours trip was really pleasant ☺️. Planning the next trip.

Coach seating is debilitating, neither my husband or I can walk the following day

Excellent. Although they used to greet me as a mosaic member and provide a free drink, early boarding helps me to keep coming back to JetBlue.

Great flight. Departed early, arrived early. However they were out of meals for sale. Also, we arrived early and the gate was not available so we sat on the taxiway for quite a while (not JetBlue’s fault).

Cancelled flight with no specific instructions to get a boarding pass for another flight. The whole flight of people were in line for an hour because there was only 1 person to help at the desk. This was unusual for JetBlue.

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

Except for the 28 minute delay leaving and the earlier reschedule to a later takeoff time the flight was good.

Loved the leg room and tvs screens on the seats and free WiFi. Wish the price was lower and could save by rebooking

It took 1-1/2 hours to get our luggage after we landed. That to me is unacceptable

The flight was delayed for 4 hours. Once onboard the crew was wonderful.

Overall was excellent. Will definitely us JetBlue in the future.

Love the mosaic program, being able to move to an extra space seat for free is awesome

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

Information on your arrival and departure airports

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