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Cheap flights from Seattle to Boston from C$ 164

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Seattle to Boston departing on 3/10. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Cheap round-trip flights

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$ 258JetBlue
Find Deal
Sat, 18 Oct - Thu, 23 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
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$ 261JetBlue
Find Deal
Sat, 18 Oct - Fri, 24 Oct
Alaska Airlines Logo
3:59 p.m. - 12:20 a.m.SEA-BOS
5h 21mdirect
Alaska Airlines Logo
7:00 a.m. - 10:35 a.m.BOS-SEA
6h 35mdirect
C$ 272Alaska Airlines
Find Deal
Sat, 1 Nov - Tue, 11 Nov
Alaska Airlines Logo
3:59 p.m. - 12:20 a.m.SEA-BOS
5h 21mdirect
Alaska Airlines Logo
7:00 a.m. - 10:35 a.m.BOS-SEA
6h 35mdirect
C$ 286Alaska Airlines
Find Deal
Sat, 1 Nov - Thu, 6 Nov
Southwest Logo
5:00 a.m. - 4:55 p.m.SEA-BOS
8h 55m2 stops
Southwest Logo
6:45 a.m. - 3:05 p.m.BOS-SEA
11h 20m1 stop
C$ 293Southwest
Find Deal
Sat, 25 Oct - Wed, 29 Oct
Hawaiian Airlines Logo
11:15 p.m. - 7:53 a.m.SEA-BOS
5h 38mdirect
Hawaiian Airlines Logo
7:00 a.m. - 10:35 a.m.BOS-SEA
6h 35mdirect
C$ 300Hawaiian Airlines
Find Deal
Fri, 24 Oct - Fri, 31 Oct
Southwest Logo
5:00 a.m. - 4:55 p.m.SEA-BOS
8h 55m2 stops
Southwest Logo
5:15 a.m. - 3:00 p.m.BOS-SEA
12h 45m1 stop
C$ 301Southwest
Find Deal
Sat, 25 Oct - Thu, 30 Oct
Hawaiian Airlines Logo
9:00 a.m. - 5:20 p.m.SEA-BOS
5h 20mdirect
Hawaiian Airlines Logo
7:00 a.m. - 10:35 a.m.BOS-SEA
6h 35mdirect
C$ 356Hawaiian Airlines
Find Deal
Tue, 9 Dec - Fri, 12 Dec
Delta Logo
10:05 p.m. - 6:35 a.m.SEA-BOS
5h 30mdirect
Delta Logo
6:55 p.m. - 10:22 p.m.BOS-SEA
6h 27mdirect
C$ 369Delta
Find Deal
Sun, 26 Oct - Wed, 29 Oct

JetBlue flights from Seattle to Boston

Our best JetBlue deals on Seattle to Boston flight tickets
JetBlue
18 Oct
SEA1:10 p.m.Seattle/Tacoma Intl
5h 36m
BOS9:46 p.m.Boston Logan Intl
23 Oct
BOS8:20 a.m.Boston Logan Intl
6h 39m
SEA11:59 a.m.Seattle/Tacoma Intl
C$ 258
Find similar
JetBlue
18 Oct
SEA1:10 p.m.Seattle/Tacoma Intl
5h 36m
BOS9:46 p.m.Boston Logan Intl
24 Oct
BOS8:20 a.m.Boston Logan Intl
6h 39m
SEA11:59 a.m.Seattle/Tacoma Intl
C$ 260
Find similar
JetBlue
18 Oct
SEA1:10 p.m.Seattle/Tacoma Intl
5h 36m
BOS9:46 p.m.Boston Logan Intl
24 Oct
BOS8:20 a.m.Boston Logan Intl
6h 39m
SEA11:59 a.m.Seattle/Tacoma Intl
C$ 261
Find similar

Hawaiian Airlines flights from Seattle to Boston

Our best Hawaiian Airlines deals on Seattle to Boston flight tickets
Hawaiian Airlines
24 Oct
SEA11:15 p.m.Seattle/Tacoma Intl
5h 38m
BOS7:53 a.m.Boston Logan Intl
31 Oct
BOS7:00 a.m.Boston Logan Intl
6h 35m
SEA10:35 a.m.Seattle/Tacoma Intl
C$ 300
Find similar
Hawaiian Airlines
9 Dec
SEA9:00 a.m.Seattle/Tacoma Intl
5h 20m
BOS5:20 p.m.Boston Logan Intl
12 Dec
BOS7:00 a.m.Boston Logan Intl
6h 35m
SEA10:35 a.m.Seattle/Tacoma Intl
C$ 356
Find similar
Hawaiian Airlines
1 Nov
SEA3:59 p.m.Seattle/Tacoma Intl
5h 21m
BOS12:20 a.m.Boston Logan Intl
2 Nov
BOS7:00 a.m.Boston Logan Intl
6h 35m
SEA10:35 a.m.Seattle/Tacoma Intl
C$ 390
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Seattle to Boston that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 96,600 searches. Data last updated 16 September 2025.
Use the filters below to find and compare flights from Seattle to Boston that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Sat 18/10

1:10 p.m.-9:46 p.m.

Nonstop5h 36m

Boston Logan Intl

Thu 23/10

8:20 a.m.-11:59 a.m.

Nonstop6h 39m

C$ 258

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Sat 18/10

1:10 p.m.-9:46 p.m.

Nonstop5h 36m

Boston Logan Intl

Fri 24/10

8:20 a.m.-11:59 a.m.

Nonstop6h 39m

C$ 260

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Sat 18/10

1:10 p.m.-9:46 p.m.

Nonstop5h 36m

Boston Logan Intl

Fri 24/10

8:20 a.m.-11:59 a.m.

Nonstop6h 39m

C$ 261

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Sat 1/11

3:59 p.m.-12:20 a.m.

Nonstop5h 21m

Boston Logan Intl

Tue 11/11

7:00 a.m.-10:35 a.m.

Nonstop6h 35m

C$ 272

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Sat 1/11

3:59 p.m.-12:20 a.m.

Nonstop5h 21m

Boston Logan Intl

Thu 6/11

7:00 a.m.-10:35 a.m.

Nonstop6h 35m

C$ 286

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Sat 25/10

5:00 a.m.-4:55 p.m.

2 stops8h 55m

Boston Logan Intl

Wed 29/10

6:45 a.m.-3:05 p.m.

1 stop11h 20m

C$ 293

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Fri 24/10

11:15 p.m.-7:53 a.m.

Nonstop5h 38m

Boston Logan Intl

Fri 31/10

7:00 a.m.-10:35 a.m.

Nonstop6h 35m

C$ 300

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Sat 25/10

5:00 a.m.-4:55 p.m.

2 stops8h 55m

Boston Logan Intl

Thu 30/10

5:15 a.m.-3:00 p.m.

1 stop12h 45m

C$ 301

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Tue 9/12

9:00 a.m.-5:20 p.m.

Nonstop5h 20m

Boston Logan Intl

Fri 12/12

7:00 a.m.-10:35 a.m.

Nonstop6h 35m

C$ 356

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Sun 26/10

10:05 p.m.-6:35 a.m.

Nonstop5h 30m

Boston Logan Intl

Wed 29/10

6:55 p.m.-10:22 p.m.

Nonstop6h 27m

C$ 369

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Boston from

How to get the cheapest flight ticket from Seattle to Boston

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Boston?

The cheapest month to fly to Boston from Seattle is in January. Flight prices, which tend to average around C$ 300, are often lower during this time because this is during the off-season. If you are unable to visit Boston during the month of January, then departing from Seattle during the month March is also very affordable. Most momondo users find prices during this month for around C$ 369.

What is the cheapest day to depart on your flight to Boston?

On average, the least expensive day to fly to Boston from Seattle is on a Monday. momondo users have found tickets for Monday departures for as low as C$ 375. However, this price may fluctuate depending on the airline, the season, and holidays. Flights from Seattle to Boston on a Sunday will generally be more expensive and average around C$ 1,266. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

What is the cheapest time of day to depart on your flight to Boston?

Flying to Boston from Seattle at noon is the least expensive time of day to depart. momondo users have found prices as low as C$ 355 when looking at flights departing at noon. Flights in the morning are often more expensive with an average ticket price of C$ 832.

What is the cheapest Seattle/Tacoma Intl to Boston Logan Intl flight route?

Fly from Seattle/Tacoma Intl to Boston Logan Intl for the best Seattle/Tacoma Intl - Boston Logan Intl flight prices

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

You are more likely to see cheaper flights to Boston from Seattle when booking weeks ahead of your departure date. In general, you can expect to find flights to Boston for around C$ 479 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Boston from Seattle for as low as C$ 405 on momondo.

What cabin class options are available on Seattle/Tacoma Intl to Boston Logan Intl flights?

There are 2 cabin classes available to choose from on Seattle/Tacoma Intl to Boston Logan Intl flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

How have Seattle to Boston flight prices changed over time?

As of September 2025, prices for Seattle to Boston flights are approximately 22% cheaper when compared to flights at the same time last year.

When to book flights from Seattle to Boston

Are you open to changing your travel dates? Check out the ideal times to fly from Seattle to Boston according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Seattle to Boston (SEA to BOS) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Seattle to Boston

Best price found

C$ 405

Fastest flight time

5h 16m

Direct flights

Every day

Airports in Boston

1 airport
The best one-way flight to Boston from Seattle in the past 72 hours is C$ 405. The best round-trip flight deal from Seattle to Boston found on momondo in the last 72 hours is C$ 327.
The fastest flight from Seattle to Boston takes 5h 16m
Direct flights go from Seattle to Boston every day.
There is 1 airport near Boston: Boston Logan Intl (BOS)
Search flight deals

  • How far is Seattle/Tacoma Intl to Boston Logan Intl by plane?

    A flight from Seattle/Tacoma Intl to Boston Logan Intl will travel around 3997.7 km. Typically, this will take 5h 19m by plane in normal conditions.

  • When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to Boston Logan Intl Airport?

    Prices for flights from Seattle/Tacoma Intl Airport to Boston Logan Intl Airport were last updated today.

  • How many operators does momondo search for flights from Seattle/Tacoma Intl Airport to Boston Logan Intl Airport?

  • How old do you have to be to fly from Seattle/Tacoma Intl Airport to Boston Logan Intl Airport?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Seattle/Tacoma Intl Airport to Boston Logan Intl Airport.

  • What documentation or ID do you need to fly to Boston Logan Intl Airport?

    The required travel and health documents for your Boston Logan Intl Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Boston Logan Intl Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

  • What is the most popular plane model from Seattle to Boston?

  • What is the most popular airline from Seattle to Boston?

Best airlines flying from Seattle to Boston

Compare and see reviews for airlines that fly from Seattle to Boston with momondo
Airline
Rating
Free Cancellation
Price
DeltaPriceFrom C$ 136Free CancellationRating
7.9
7,957 reviews
Search Delta flights
Alaska AirlinesPriceFrom C$ 167Free CancellationRating
8.0
10,000 reviews
Search Alaska Airlines flights
JetBluePriceFrom C$ 177Free CancellationRating
7.2
2,914 reviews
Search JetBlue flights

  • Alaska Airlines Flights From Seattle to Boston

    Alaska Airlines flies from Seattle to Boston around 16 times per week, with 10,000 momondo users rating the airline 8.0/10. The cheapest Alaska Airlines deal from Seattle to Boston in the last 72 hours was C$ 121 (round-trip), much lower than the average airfare cost of C$ 407 for Alaska Airlines flights on this route.

  • Delta Flights From Seattle to Boston

    Delta is also a popular choice for this route. Delta flight deals for Seattle to Boston start from as low as C$ 99 round-trip, depending on your selected dates, with average Delta deals seen on momondo around C$ 237. Delta operates 17 flights to Boston from Seattle in an average week. Users have rated it 7.9/10 across 7,957 reviews.

Travelling to a place near Boston?

Book flights to Boston if you plan to visit one of these locations
Hampton Beach
Old Orchard Beach
Salem
Ogunquit
Wells
Cambridge
Everett
Needham
Newton
West Yarmouth
Saco
Middletown
Westbrook
Burlington
Sturbridge
Scarborough
Cape Neddick
Waltham
Quincy
Peabody

Why use momondo?

Why should I use momondo to find a flight deal from Seattle to Boston?

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Seattle to Boston for you.

Can I find flights from Seattle to Boston with flexible booking policies on momondo?

Yes. All flights to Boston from Seattle on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from Seattle to Boston?

Once all potential Seattle to Boston flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from Seattle to Boston right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of Seattle to Boston flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

An easier way to manage your Boston trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
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