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Cheap flights from Seattle to Boston from C$ 150

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 24/9. 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
11:30 a.m. - 8:23 p.m.SEA-BOS
5h 53mdirect
JetBlue Logo
7:00 a.m. - 10:19 a.m.BOS-SEA
6h 19mdirect
C$ 298JetBlue
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Sat, 20 Sep - Sat, 27 Sep
Hawaiian Airlines Logo
3:59 p.m. - 12:27 a.m.SEA-BOS
5h 28mdirect
Hawaiian Airlines Logo
9:20 a.m. - 12:34 p.m.BOS-SEA
6h 14mdirect
C$ 299Hawaiian Airlines
Find Deal
Tue, 16 Sep - Wed, 24 Sep
Alaska Airlines Logo
3:59 p.m. - 12:27 a.m.SEA-BOS
5h 28mdirect
Alaska Airlines Logo
7:45 a.m. - 2:50 p.m.BOS-SEA
10h 05m1 stop
C$ 313Alaska Airlines
Find Deal
Tue, 16 Sep - Tue, 30 Sep
Alaska Airlines Logo
8:25 p.m. - 3:41 p.m.SEA-BOS
16h 16m1 stop
Alaska Airlines Logo
6:59 p.m. - 11:23 a.m.BOS-SEA
19h 24m1 stop
C$ 326Alaska Airlines
Find Deal
Wed, 29 Oct - Sat, 1 Nov
United Airlines Logo
11:54 p.m. - 11:01 a.m.SEA-BOS
8h 07m1 stop
United Airlines Logo
4:27 p.m. - 10:20 p.m.BOS-SEA
8h 53m1 stop
C$ 348United Airlines
Find Deal
Mon, 25 Aug - Wed, 3 Sep
Delta Logo
3:38 p.m. - 11:59 p.m.SEA-BOS
5h 21mdirect
Delta Logo
6:45 p.m. - 10:01 p.m.BOS-SEA
6h 16mdirect
C$ 361Delta
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Thu, 18 Sep - Sat, 27 Sep
Southwest Logo
11:10 p.m. - 10:00 a.m.SEA-BOS
7h 50m1 stop
Southwest Logo
6:30 p.m. - 12:05 a.m.BOS-SEA
8h 35m1 stop
C$ 368Southwest
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Thu, 11 Sep - Fri, 19 Sep
Delta Logo
3:38 p.m. - 11:59 p.m.SEA-BOS
5h 21mdirect
Delta Logo
7:25 a.m. - 10:43 a.m.BOS-SEA
6h 18mdirect
C$ 375Delta
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Thu, 18 Sep - Mon, 22 Sep
Southwest Logo
5:45 a.m. - 9:55 p.m.SEA-BOS
13h 10m2 stops
Southwest Logo
5:30 a.m. - 1:25 p.m.BOS-SEA
10h 55m1 stop
C$ 383Southwest
Find Deal
Sat, 8 Nov - Wed, 12 Nov
United Airlines Logo
1:55 p.m. - 12:45 a.m.SEA-BOS
7h 50m1 stop
United Airlines Logo
11:50 a.m. - 5:58 p.m.BOS-SEA
9h 08m1 stop
C$ 440United Airlines
Find Deal
Thu, 21 Aug - Tue, 26 Aug

Hawaiian Airlines flights from Seattle to Boston

Our best Hawaiian Airlines deals on Seattle to Boston flight tickets
Hawaiian Airlines
16 Sep
SEA3:59 p.m.Seattle/Tacoma Intl
5h 28m
BOS12:27 a.m.Boston Logan Intl
24 Sep
BOS9:20 a.m.Boston Logan Intl
6h 14m
SEA12:34 p.m.Seattle/Tacoma Intl
C$ 299
Find similar
Hawaiian Airlines
22 Sep
SEA3:59 p.m.Seattle/Tacoma Intl
5h 28m
BOS12:27 a.m.Boston Logan Intl
6 Oct
BOS7:20 a.m.Boston Logan Intl
6h 29m
SEA10:49 a.m.Seattle/Tacoma Intl
C$ 308
Find similar
Hawaiian Airlines
31 Oct
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$ 382
Find similar

Alaska Airlines flights from Seattle to Boston

Our best Alaska Airlines deals on Seattle to Boston flight tickets
Alaska Airlines
16 Sep
SEA3:59 p.m.Seattle/Tacoma Intl
5h 28m
BOS12:27 a.m.Boston Logan Intl
30 Sep
BOS7:45 a.m.Boston Logan Intl
10h 05m
1 stop
SEA2:50 p.m.Seattle/Tacoma Intl
C$ 313
Find similar
Alaska Airlines
29 Oct
SEA8:25 p.m.Seattle/Tacoma Intl
16h 16m
1 stop
BOS3:41 p.m.Boston Logan Intl
1 Nov
BOS6:59 p.m.Boston Logan Intl
19h 24m
1 stop
SEA11:23 a.m.Seattle/Tacoma Intl
C$ 326
Find similar
Alaska Airlines
9 Sep
SEA3:55 p.m.Seattle/Tacoma Intl
20h 05m
1 stop
BOS3:00 p.m.Boston Logan Intl
11 Sep
BOS5:08 p.m.Boston Logan Intl
19h 17m
1 stop
SEA9:25 a.m.Seattle/Tacoma Intl
C$ 339
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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 31 July 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 20/9

11:30 a.m.-8:23 p.m.

Nonstop5h 53m

Boston Logan Intl

Sat 27/9

7:00 a.m.-10:19 a.m.

Nonstop6h 19m

C$ 298

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Tue 16/9

3:59 p.m.-12:27 a.m.

Nonstop5h 28m

Boston Logan Intl

Wed 24/9

9:20 a.m.-12:34 p.m.

Nonstop6h 14m

C$ 299

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Tue 16/9

3:59 p.m.-12:27 a.m.

Nonstop5h 28m

Boston Logan Intl

Tue 30/9

7:45 a.m.-2:50 p.m.

1 stop10h 05m

C$ 313

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Wed 29/10

8:25 p.m.-3:41 p.m.

1 stop16h 16m

Boston Logan Intl

Sat 1/11

6:59 p.m.-11:23 a.m.

1 stop19h 24m

C$ 326

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Mon 25/8

11:54 p.m.-11:01 a.m.

1 stop8h 07m

Boston Logan Intl

Wed 3/9

4:27 p.m.-10:20 p.m.

1 stop8h 53m

C$ 348

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Thu 18/9

3:38 p.m.-11:59 p.m.

Nonstop5h 21m

Boston Logan Intl

Sat 27/9

6:45 p.m.-10:01 p.m.

Nonstop6h 16m

C$ 361

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Thu 11/9

11:10 p.m.-10:00 a.m.

1 stop7h 50m

Boston Logan Intl

Fri 19/9

6:30 p.m.-12:05 a.m.

1 stop8h 35m

C$ 368

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Thu 18/9

3:38 p.m.-11:59 p.m.

Nonstop5h 21m

Boston Logan Intl

Mon 22/9

7:25 a.m.-10:43 a.m.

Nonstop6h 18m

C$ 375

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Sat 8/11

5:45 a.m.-9:55 p.m.

2 stops13h 10m

Boston Logan Intl

Wed 12/11

5:30 a.m.-1:25 p.m.

1 stop10h 55m

C$ 383

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Thu 21/8

1:55 p.m.-12:45 a.m.

1 stop7h 50m

Boston Logan Intl

Tue 26/8

11:50 a.m.-5:58 p.m.

1 stop9h 08m

C$ 440

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$ 299, 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$ 368.

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 Wednesday. momondo users have found tickets for Wednesday departures for as low as C$ 479. 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$ 1,282. 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 in the evening is the least expensive time of day to depart. momondo users have found prices as low as C$ 475 when looking at flights departing in the evening. Flights in the morning are often more expensive with an average ticket price of C$ 880.

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$ 485 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$ 425 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 July 2025, prices for Seattle to Boston flights are approximately 15% 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$ 150

Fastest flight time

5h 15m

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$ 150. The best round-trip flight deal from Seattle to Boston found on momondo in the last 72 hours is C$ 298.
The fastest flight from Seattle to Boston takes 5h 15m
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$ 137Free CancellationRating
8.0
7,981 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

  • Delta Flights From Seattle to Boston

    Delta flies from Seattle to Boston around 17 times per week, with 7,981 momondo users rating the airline 8.0/10. The cheapest Delta deal from Seattle to Boston in the last 72 hours was C$ 99 (round-trip), much lower than the average airfare cost of C$ 262 for Delta flights on this route.

  • Alaska Airlines Flights From Seattle to Boston

    Alaska Airlines is also a popular choice for this route. Alaska Airlines flight deals for Seattle to Boston start from as low as C$ 121 round-trip, depending on your selected dates, with average Alaska Airlines deals seen on momondo around C$ 383. Alaska Airlines operates 27 flights to Boston from Seattle in an average week. Users have rated it 8.0/10 across 10,000 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
Ogunquit
Salem
Wells
Cambridge
Everett
Sturbridge
Exeter
Kennebunkport
Needham
Kennebunk
West Yarmouth
Newton
Scarborough
Cape Neddick
Danvers
Westbrook
Burlington
Foxborough

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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