SEA - BOS

C$ 275 Find Cheap Flights from Seattle to Boston – Compare and Save

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Everything you should know

Cheapest round-trip
C$ 460
Typical prices: C$ 490-C$ 789
Southwest
Fri 7/12Mon 10/12
SEA - BOS • 1 stop
Cheapest direct flights
C$ 464
Typical prices: C$ 495-C$ 790
JetBlue
Wed 3/10Wed 10/10
SEA - BOS • Direct
Advice from real travellers
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
+1
Expert advice
+1
Direct flights
You can fly direct with Delta, Alaska Airlines, and JetBlue. Average duration is 5h 28m
Direct flights
+1
Direct flights
+1
Avoid delays
Most punctual • 88% on-time
Best time • Fewest delays
Insights
Insights
When to book
in advance
Our data shows that travellers who book at least 25 weeks in advance save around 45% compared to booking last minute.
Insights
Insights
When to travel
Cheapest • 20% price drop
Most popular
Good to know
+1
Good to know
+1
Top layover airports
Cheapest • Avg C$ 358 (round-trip)
Shortest trip • 8h 19m (one-way)
Insights
Insights
Start a new search
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We hope you enjoy your trip to Boston!
Flight Deals
Booking Insights
Expert advice
Flight Deals

Cheap Flights from Seattle to Boston (SEA-BOS)

 
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Seattle to Boston

Mon, 7 Dec - Thu, 10 Dec
Southwest Logo
7:00 a.m. - 7:45 p.m.SEA  Seattle/Tacoma Intl-BOS Boston Logan Intl
9h 45m1 stop San Diego
Southwest Logo
3:30 p.m. - 11:30 p.m.BOS  Boston Logan Intl-SEA Seattle/Tacoma Intl
11h 00m2 stops Baltimore/Washington Chicago Midway
C$ 460Southwest
Sat, 3 Oct - Sat, 10 Oct
JetBlue Logo
11:42 p.m. - 8:06 a.m.SEA  Seattle/Tacoma Intl-BOS Boston Logan Intl
5h 24mdirect
JetBlue Logo
7:20 p.m. - 10:42 p.m.BOS  Boston Logan Intl-SEA Seattle/Tacoma Intl
6h 22mdirect
C$ 464JetBlue
Sat, 3 Oct - Sat, 10 Oct
JetBlue Logo
11:42 p.m. - 8:06 a.m.SEA  Seattle/Tacoma Intl-BOS Boston Logan Intl
5h 24mdirect
JetBlue Logo
7:20 p.m. - 10:42 p.m.BOS  Boston Logan Intl-SEA Seattle/Tacoma Intl
6h 22mdirect
C$ 465JetBlue
Mon, 19 Oct - Thu, 22 Oct
Southwest Logo
12:10 a.m. - 11:10 a.m.SEA  Seattle/Tacoma Intl-BOS Boston Logan Intl
8h 00m1 stop Chicago Midway
Southwest Logo
6:35 p.m. - 12:40 a.m.BOS  Boston Logan Intl-SEA Seattle/Tacoma Intl
9h 05m1 stop Chicago Midway
C$ 465Southwest
Wed, 4 Nov - Mon, 16 Nov
Southwest Logo
7:00 a.m. - 7:50 p.m.SEA  Seattle/Tacoma Intl-BOS Boston Logan Intl
9h 50m1 stop San Diego
Southwest Logo
7:10 a.m. - 12:50 p.m.BOS  Boston Logan Intl-SEA Seattle/Tacoma Intl
8h 40m1 stop Chicago Midway
C$ 465Southwest
Thu, 22 Oct - Tue, 27 Oct
Southwest Logo
2:10 p.m. - 1:15 a.m.SEA  Seattle/Tacoma Intl-BOS Boston Logan Intl
8h 05m1 stop Denver Intl
Southwest Logo
7:20 a.m. - 12:45 p.m.BOS  Boston Logan Intl-SEA Seattle/Tacoma Intl
8h 25m1 stop Chicago Midway
C$ 465Southwest
Wed, 21 Oct - Tue, 27 Oct
Alaska Airlines Logo
2:59 p.m. - 5:21 a.m.SEA  Seattle/Tacoma Intl-BOS Boston Logan Intl
11h 22m1 stop San Diego
Alaska Airlines Logo
6:14 p.m. - 3:17 p.m.BOS  Boston Logan Intl-SEA Seattle/Tacoma Intl
24h 03m1 stop San Diego
C$ 477Alaska Airlines
Sun, 18 Oct - Sat, 31 Oct
Alaska Airlines Logo
8:07 p.m. - 5:07 p.m.SEA  Seattle/Tacoma Intl-BOS Boston Logan Intl
18h 00m1 stop San Diego
Alaska Airlines Logo
7:51 a.m. - 9:33 p.m.BOS  Boston Logan Intl-SEA Seattle/Tacoma Intl
16h 42m1 stop San Diego
C$ 477Alaska Airlines
Fri, 6 Nov - Tue, 17 Nov
Alaska Airlines Logo
8:48 p.m. - 5:46 a.m.SEA  Seattle/Tacoma Intl-BOS Boston Logan Intl
29h 58m1 stop San Diego
Alaska Airlines Logo
7:03 a.m. - 9:29 p.m.BOS  Boston Logan Intl-SEA Seattle/Tacoma Intl
17h 26m1 stop San Diego
C$ 477Alaska Airlines
Tue, 20 Oct - Sat, 24 Oct
JetBlue Logo
10:15 p.m. - 11:01 a.m.SEA  Seattle/Tacoma Intl-BOS Boston Logan Intl
9h 46m1 stop New York John F Kennedy Intl
JetBlue Logo
1:00 p.m. - 9:20 p.m.BOS  Boston Logan Intl-SEA Seattle/Tacoma Intl
11h 20m1 stop New York John F Kennedy Intl
C$ 477JetBlue
Booking Insights

Price, demand, and travel trends for Seattle to Boston flights

Use KAYAK data on prices, travel dates, airlines, and seasonal trends to compare options and book flights from Seattle to Boston with more confidence.

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

Round-trip flights from Seattle to Boston start at C$ 460. Prices are below average for this route right now, with typical round-trip fares ranging from C$ 490 to C$ 789. The lowest price found in the past 5 days was C$ 460 on Southwest.

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

Tuesday is the cheapest day of the week to fly from Seattle to Boston and is 11% cheaper than the average day. Sunday is the most expensive day with flight prices 14% higher than average. Based on deals found by KAYAK users in the last 12 months.

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

  • September is the cheapest month to fly from Seattle to Boston at C$ 496 round-trip.
  • December (C$ 779) and August (C$ 668) are the most expensive months.
  • The price difference between flying in the cheapest and most expensive months is 57% on average.
This is based on KAYAK aggregated and averaged internal data over the past 12 months.

When are prices from Seattle to Boston the cheapest?

Flights from Seattle to Boston are cheapest 25 weeks before departure. Booking in this window typically costs about 45% less than the average last-minute fare (within 2 weeks of the flight), based on KAYAK data.

Expert advice

Expert advice for your flight from Seattle to Boston

 
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 Alaska Airlines, JetBlue 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.

Key details for Seattle to Boston flights

Low season

February

Cheapest flight

C$ 275
Best time to beat the crowds (13% less expensive on average)
Most popular time to fly (7% more expensive on average)
Flights 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

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-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-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.

Your Seattle to Boston flight questions, answered

Find helpful route details based on KAYAK data, including flight times, airports, airlines, and booking questions.

  • 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.

  • Which airlines offer extra legroom and free seat selection on Seattle to Boston flights?

    Among airlines operating Seattle to Boston flights:

    • JetBlue: offers extra legroom; offers free seat selection
    • Delta: offers extra legroom; offers free seat selection
    • Alaska Airlines: offers extra legroom; offers free seat selection
    • American Airlines: offers free seat selection

    Extra legroom and free seat selection availability depends on fare class and route.

  • Which airlines are available on the route from Seattle to Boston?

    3 airlines operate flights between Seattle and Boston. The airlines offering direct flights on this route include:

    • Delta
    • Alaska Airlines
    • JetBlue

  • Which airports can I use when flying from Seattle to Boston?

    Flights from Seattle to Boston usually depart from Seattle/Tacoma Intl (SEA) and arrive at Boston Logan Intl (BOS).

  • Which airlines include bags at no extra cost on Seattle to Boston flights?

    Here are some options for this route, based on selected ticket types and cabin classes:

    • Delta: a carry-on bag and a checked bag in Economy Class
    • Alaska Airlines: a carry-on bag and a checked bag in Economy Class
    • American Airlines: a carry-on bag and a checked bag in Business Class

    Bag allowance can vary by ticket type, cabin class, route, and airline, so travellers should check the fare details before booking.

  • Which cabin classes can I book on flights from Seattle to Boston?

    Only Economy Class is available on flights from Seattle to Boston.

  • How much can I save by taking a layover when flying from Seattle to Boston?

    On this route, layover flights are cheaper than direct options on average. Layover fares average C$ 358 round-trip via Baltimore/Washington (BWI), compared to C$ 623 for direct.

  • What is the standard checked bag allowance on flights from Seattle to Boston?

    There is no standard. Checked bag policies vary by airline on this route. Most carriers charge C$ 49–C$ 139 for the first checked bag in economy. Premium fares and elite status bookings typically include a free checked bag.

  • Which aircraft model is used most often on flights from Seattle to Boston?

    The Airbus A321-100/200 family is used most often on this route, operated mainly by JetBlue and Delta. Other aircraft seen on the route include Airbus A321neo variants.

  • Which airports do connecting flights from Seattle to Boston pass through?

    One-stop flights from Seattle to Boston most commonly connect through:

    • Minneapolis St Paul (MSP) – 37% of one-stop connections
    • Chicago O'Hare Intl (ORD) – 23% of one-stop connections
    • Philadelphia (PHL) – 15% of one-stop connections
    • Chicago Midway (MDW) – 8% of one-stop connections

    Minneapolis St Paul (MSP) handles the largest share of one-stop connections on this route.

  • Can I save money by using flexible dates for flights from Seattle to Boston?

    Yes. Being flexible with your travel dates can save you up to 22% on the Seattle to Boston route. Tuesday is the cheapest departure day at C$ 557 round-trip on average, while Sunday is the most expensive at C$ 711, a difference of C$ 154. KAYAK's flexible dates feature shows options up to 3 days before and after your selected dates, making it easier to compare nearby fares.

  • At what point is a flight considered delayed on the route from Seattle to Boston?

    A flight is considered delayed when it departs 15 minutes or more after its scheduled time. This is the standard used by the US Department of Transportation and most airline industry reporting. On the Seattle to Boston route, 16% of flights were delayed in the past 3 months, with delays averaging 2 hours 58 minutes.

  • How are flight departures from Seattle to Boston spread across the day?

    Morning is the busiest departure period on Seattle to Boston flights, with 43% leaving in that window. Afternoon departures account for 29%, Night flights for 28%, and Evening flights for 0%.

  • Which popular places can I visit in Boston?

    Some of the most popular sights in Boston are Fenway Park, TD Garden, and Back Bay. These are among the most viewed places in Boston on KAYAK.

  • What are the earliest and latest flights from Seattle to Boston?

    These are the earliest and latest flight times available from Seattle to Boston:

    • Earliest: departs at 7:16 am and lands at 12:44 pm
    • Latest: departs at 11:59 pm and lands at 5:27 am.

    The flight takes about 5h 28m.

  • How expensive are last-minute Seattle to Boston flights?

    Last-minute fares on this route – booked within 2 weeks of departure – run 38% above the route average of C$ 620. Book 25 weeks before departure for the lowest fares.

  • How long does a flight from Seattle to Boston take?

    A direct flight from Seattle to Boston takes 5h 28m, covering 6,441 km.

  • Do I need a passport to fly from Seattle to Boston?

    No, a passport is not required for this domestic route, but you will need a real ID-compliant driver's license, a state ID, or another TSA-accepted form of identification.

  • Have flight prices from Seattle to Boston changed much recently?

    Yes. Based on fares seen in the past 5 days, round-trip prices on this route showed a wide range, from about C$ 460 to C$ 2,407. That means the highest observed fare was about 5x higher than the lowest one.

  • How are flight prices from Seattle to Boston looking right now?

    One-way fares from Seattle to Boston are currently lower than usual. Average one-way flight prices are about C$ 281, which is 27% below the typical average for this route.

  • How does Delta's on-time performance compare to other airlines on Seattle to Boston flights?

    Delta is slightly above the route average for timely arrivals, while Alaska Airlines has a lower on-time arrival rate. On-time arrival rates on Seattle to Boston flights are:

    • Delta: 88% on time
    • Alaska Airlines: 85% on time
    • JetBlue: 59% on time

    On average, flights on this route are punctual 84% of the time.

  • How do delay rates compare for morning and evening flights from Seattle to Boston?

    Night flights have the fewest delays on this route. Delays tend to pile up throughout the day as one late flight pushes the next, so earlier departures are usually more reliable.

  • How much time can I save by choosing a different layover airport when travelling from Seattle to Boston?

    Flying via Chicago O'Hare Intl (ORD) gives the shortest average 1-stop total travel time at 8h 19m, compared with 8h 19m via Philadelphia (PHL) and 8h 20m via Denver Intl (DEN).

  • What is the time difference between Seattle and Boston?

    Boston is 3 hours ahead of Seattle (Eastern Time vs Pacific Time). Plan for the time shift when scheduling connections or first-day activities.

  • What car rental options are available at Boston Logan Intl Airport (BOS)?

    Boston Logan Intl Airport (BOS) hosts 5 major car rental companies, with daily rates starting from around C$ 32 for economy cars. Top options include:
    • Dollar
    • Hertz
    • Budget
    • Thrifty
    • Sixt

  • How much should I expect to pay for a Seattle to Boston flight?

    Round-trip flights from Seattle to Boston range from C$ 490 to C$ 789, with an average of C$ 620 over the past 12 months. Anything below C$ 490 counts as a good deal.

  • Which airlines offer Wi-Fi on Seattle to Boston flights?

    Three airlines offer in-flight Wi-Fi on Seattle to Boston flights:

    • • JetBlue
    • • Delta
    • • Alaska Airlines

    Pricing varies by airline and fare class. Some plans are included with the ticket or loyalty program; others are paid add-ons priced by flight length.

Your guide to booking Seattle to Boston flights

Get tips on when to book, when to fly, and what to know before your trip.
  • If your dates are flexible, aim for a Tuesday departure instead of Sunday. On this route, Tuesday flights average C$ 557 – about C$ 154 less than Sunday (22% savings) based on the last 12 months.
  • For the best chance at a low fare, aim to book around 25 weeks before you fly. On this route, that window historically saves about 45% versus last-minute pricing (KAYAK booking data, last 12 months).
  • If you can choose when to travel, plan your Seattle to Boston trip for September. Fares historically average C$ 496 round-trip in that month – typically C$ 283 less than the most expensive month, which is December (based on the last 12 months).
  • If arriving on time is high on your priority list, Delta is the strongest pick on this route. 88% of Delta flights from Seattle to Boston arrived on time in the past 3 months, slightly above the route's average on-time arrival rate of 84%. When flights on this route do arrive late, the average delay is 2 hours58 minutes, so choosing a carrier with strong on-time performance can make a difference on tight schedules.
  • If you have the time, taking a 1-stop flight through Baltimore/Washington Airport (BWI) can be cheaper than flying direct. The cheapest layover option averages C$ 358 round-trip on this route – about C$ 265 less than direct flights (based on the last 12 months).
  • If you're arriving late at night and need somewhere to stay, check out these hotels close to Boston Logan Intl Airport.
    - Embassy Suites by Hilton Boston at Logan Airport
    - Hilton Garden Inn Boston Logan Airport
    - Hilton Boston Logan Airport
  • 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?

 
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

More options for your flight from Seattle to Boston

Complete your trip to Boston with a hotel stay or car rental