SEA - BOS

C$ 165 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 30/9. 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.
1 adult
1 adult, Economy

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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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

Tue, 28 Oct - Wed, 29 Oct
Southwest Logo
5:50 a.m. - 6:00 p.m.SEA-BOS
9h 10m2 stops
Southwest Logo
6:45 a.m. - 3:05 p.m.BOS-SEA
11h 20m1 stop
C$ 248Southwest
Find Deal
Wed, 5 Nov - Tue, 11 Nov
Southwest Logo
5:40 a.m. - 4:05 p.m.SEA-BOS
7h 25m1 stop
Southwest Logo
5:30 a.m. - 1:25 p.m.BOS-SEA
10h 55m1 stop
C$ 249Southwest
Find Deal
Thu, 9 Oct - Mon, 13 Oct
JetBlue Logo
1:10 p.m. - 9:46 p.m.SEA-BOS
5h 36mdirect
JetBlue Logo
8:20 a.m. - 11:59 a.m.BOS-SEA
6h 39mdirect
C$ 259JetBlue
Find Deal
Sat, 18 Oct - Fri, 24 Oct
JetBlue Logo
1:10 p.m. - 9:46 p.m.SEA-BOS
5h 36mdirect
JetBlue Logo
8:20 a.m. - 11:59 a.m.BOS-SEA
6h 39mdirect
C$ 260JetBlue
Find Deal
Thu, 13 Nov - Mon, 17 Nov
Hawaiian Airlines Logo
3:59 p.m. - 12:20 a.m.SEA-BOS
5h 21mdirect
Hawaiian Airlines Logo
7:00 a.m. - 10:35 a.m.BOS-SEA
6h 35mdirect
C$ 267Hawaiian Airlines
Find Deal
Mon, 10 Nov - Thu, 13 Nov
Hawaiian Airlines Logo
11:10 p.m. - 7:29 a.m.SEA-BOS
5h 19mdirect
Hawaiian Airlines Logo
9:00 a.m. - 12:35 p.m.BOS-SEA
6h 35mdirect
C$ 273Hawaiian Airlines
Find Deal
Mon, 6 Oct - Tue, 14 Oct
American Airlines Logo
12:34 a.m. - 12:11 p.m.SEA-BOS
8h 37m1 stop
American Airlines Logo
6:00 a.m. - 11:03 a.m.BOS-SEA
8h 03m1 stop
C$ 287American Airlines
Find Deal
Sat, 18 Oct - Wed, 22 Oct
Alaska Airlines Logo
3:35 p.m. - 11:59 p.m.SEA-BOS
5h 24mdirect
Alaska Airlines Logo
8:25 p.m. - 9:10 a.m.BOS-SEA
15h 45m1 stop
C$ 314Alaska Airlines
Find Deal
Thu, 13 Nov - Mon, 17 Nov
American Airlines Logo
11:15 p.m. - 9:33 a.m.SEA-BOS
7h 18m1 stop
American Airlines Logo
5:22 p.m. - 11:18 p.m.BOS-SEA
8h 56m1 stop
C$ 321American Airlines
Find Deal
Fri, 26 Sep - Tue, 30 Sep
Alaska Airlines Logo
9:40 p.m. - 3:00 p.m.SEA-BOS
14h 20m1 stop
Alaska Airlines Logo
7:20 a.m. - 10:33 a.m.BOS-SEA
6h 13mdirect
C$ 342Alaska Airlines
Find Deal

Everything you should know

Our travellers' advice
AI-generated summary based on content written by travel experts
JetBlue offers free Wi-Fi and unlimited snacks onboard.
Use SEA Spot Saver for faster security at Seattle.
Expert advice
Expert advice
Expert advice
Expert advice
Top airlines
Southwest
Cheapest • from C$ 248 (round-trip)
Alaska Airlines
Best reviews • 8.0 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to book
3 weeks
in advance
Our data shows that travellers who book at least 3 weeks in advance save around 35% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
January
Cheapest • 38% price drop
October
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Cheapest round-trip
C$ 248
Overall average: C$ 460
Southwest
Tue 28/10Wed 29/10
SEA - BOS • 2 stops
Cheapest direct flights
C$ 259
Typical prices: C$ 341-691
JetBlue
Thu 9/10Mon 13/10
SEA - BOS • Direct
Start a new search
KAYAK searches hundreds of sites at once to find you the best travel deals.
We hope you love your trip to Boston!
Expert advice

Expert advice for your flight from Seattle to Boston

 
Snippets provided in this section are AI-generated based on a summarisation 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 original 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.

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
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
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
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.

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 Monday, as we generally find the cheapest rates on that day for this route. On the other hand, Sunday is the most expensive day to fly from Seattle to Boston. For your return ticket, we recommend flying on a Thursday 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 December and August, where the average cost of round-trip tickets is C$ 648 and C$ 619 respectively.

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 35% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 8 weeks before departure.

Good to know

Low seasonFebruary
Cheapest flightC$ 165
Best time to beat the crowds (18% less expensive on average)
Most popular time to fly and prices are also 5% lower 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$ 119 for a one-way ticket and C$ 179 for a round-trip.

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

    JetBlue, Alaska Airlines, Hawaiian Airlines, and Air France offer inflight Wi-Fi service on the Seattle to Boston flight route.

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

    The Boeing 737 MAX 9 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 oneworld 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$ 563 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$ 328 and an overall rating of 7.9.

  • 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$ 517 or less one-way and C$ 307 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 3 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.
8.0
Alaska AirlinesOverall score based on 10000 reviews
8.5Crew
8.1Boarding
7.8Comfort
7.1Food
7.0Entertainment
Airline reviews

Flight was delayed as it always is with Alaska airlines. Particularly to smaller airports. No AC on the plane so it was miserably hot.

4.0 OkayKristina, Sep 2025SEA - GTF
Read more Alaska Airlines reviews

Flight was delayed as it always is with Alaska airlines. Particularly to smaller airports. No AC on the plane so it was miserably hot.

Slow boarding and the flight crew hit me with the food cart

It was very nice flight going to Seattle and coming back to Omaha. Even got in early. Very easy to check in using the Alaska Airlines App. Thank you.

They offer the only direct flight from Seattle to Pittsburgh.

Seattle airport is a mess. New bag tag system has potential, but you need more signage to guide passengers through the process as to where to go next. Told to go in one direction and then met with a very rude agent when we did. He blamed his attitude on all the folks flying over labor day that were paying his salary. Gate area for D3 is a mess compared to the North terminal. Overall Alaska is number 1 in my book.

After we boarded there was quite a long time before we actually took off, and there were no announcements from crew about why we were delayed. Later when they did make announcements they were largely inaudible. There was no food (other than for purchase) on the flight and no entertainment. Thats not a complaint, just explaining my ratings in those categories. The flight was smooth. Baggage claim was rapid.

The airline staff was great! The best safety review ive ever had!

Agent boarding us in San Diego lectured me on showing up on time for the flight, and said that if I had been three minutes later, he would have denied myself and my wife boarding. Our trusted traveler numbers were not in the system, even though I entered them when I bought the tickets. Our food orders were not in the system, even though I entered them prior to the flight. My wife requires a wheelchair, and that was delayed on both flights.

Why was I charged for a glass of wine on one flight and not on another? Why no movie or TVs? It was a long flight.

I was sitting towards back of plane and the flight attendants I thought spoke unusually loud for an evening flight. They chatted and chatted all night long and it seemed odd to me that they didn’t try to lower their voices. It is annoying as a passenger to hear all their conversations.

Perfect flight both ways. On time, courteous staff, plane comfortable and cool. Best domestic flights I’ve had in awhile.

Food was surprisingly good but the WiFi was not great

Easy boarding with an extremely kind attendant. Seats were spacious and we had 3 seats for 2 people so we could stretch out. Comfortable air flow and very attentive and hospital attendants. Bathrooms and food were the only negative. Bathrooms were so small you could hardly get in and close the door. I don’t think an obese person would fit or a person with a movement disability. Food was the trending food for flights, nonexistent. We spent $40 getting sandwich and snack at airport for our 6 hour flught.

Excellent check-in. Crew was good. Excellent communication from flight deck.

Flight was delayed long enough that I was misding my connecting flight. The agents could not get me on a comparable flight, nor could they get me s Main Cabin seat I had paid for, nor could they get me on a comparable connecting flight. The gate agent would not issue meal vouchers, even though I was delayed over six hours! I had to spend over an hour and 15 minutes with customer service on the phone to See if they could get me on a better flight and get a meal voucher. Customer service was not helpful enough in trying to find alternate flights and it Ended up taking me 24 hours for a 12 hour trip!! Delta does not provide upgrades NOR will they even give you a pass for a few hours to their lounge. They claim that they do not issue daily passes to their lounge anymore. I call BS since this would be no extra cost to them to provide excellent customer service and give you a few hours to relax in comfort when you’re sitting in a crowded airport and your flight has been screwed up for that many hours.

Amazing flight! I have never noticed the uniforms of the attendants before in twenty years of flying except today when one female had the most amazing dress on. It was beautifully designed and showed she was in charge. I never dreamed I would google who designed Delta uniforms . The ultimate compliment is when another woman admires your outfit. . I hope your designer puts it on the market

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

very difficult boarding process - aggressive passengers not the friendliest crew

WiFi was not eorkig (again) And the plane was from 1990 with the screens which were.not touch and most didn’t even work and if lucky could tune in tv

I paid extra for a seat closer to the front. The TV didn’t work at all for the entire flight. Would have been nice to know before I purchased an “upgraded “ seat

It was great. I had never flown on JetBlue before, but would be very happy to fly with them in the future.

Worst flight experience ever flights canceled. JetBlue told us just did not even bother standing in line to come back in one and a half hours then without any information we had to go pick up all of our luggage and spend over $2000 in accommodation just to get home. JetBlue said that the next flight available for us to get home would be three days later. Absolutely absurd hasn’t offered to give us any compensation do not fly JetBlue horrible company. They said it was based on the weather and the weather is great in all locations that we would’ve been flying to total hoax. I think it’s a conspiracy theory.

The captain gave good announcements and the flight attendants were friendly. The WiFi was pretty good. The plane itself looked very old inside and the seats were very uncomfortable. The screens in the seat backs were the smallest I’ve ever seen. There were so many loud and obnoxious kids on this flight and the parents didn’t do much to try to quiet them down. Some had videos and games on tablets with higher than necessary volume going the whole time.

Too many long delays with JetBlue. Worst major airline that serves JFK but unfortunately I keep going back because of the prices.

My JetBlue experience was nice. The flights ran on time, the aircraft was clean and comfortable, and the flight attendants were attentive. My only issue, which is isolated to the low-cost (budget) option at JetBlue, is that the check in process makes the user feel that they have to buy their seats. The seats offered for purchase are upgrades from the budget seats you get (which are essentially the last seats remaining). The interface should not make it feel like you must purchase a seat.

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.

I especially liked the lead crew officer. His boarding and safety announcements were made with a bit of novelty and humor. The flight also left the gate 10 minutes early and we landed about 20 minutes early… It was a delightful flight…

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

Information on your arrival and departure airports

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