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Cheap flights from Seattle to Boston from $154

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 3/1. 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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0 bags

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Cheap round-trip flights

Enter your travel dates to find the best prices.
Delta Logo
7:30 am - 3:59 pm
SEA
-
BOS
5h 29mnonstop
Delta Logo
7:44 pm - 8:43 am
BOS
-
SEA
15h 59m
1 stop
$291Delta
Wed, Mar 4 - Tue, Mar 10
American Airlines Logo
11:26 pm - 11:33 am
SEA
-
BOS
9h 07m
1 stop
American Airlines Logo
4:47 pm - 10:26 pm
BOS
-
SEA
8h 39m
1 stop
$292American Airlines
Fri, May 1 - Sat, May 9
American Airlines Logo
12:07 am - 10:46 am
SEA
-
BOS
7h 39m
1 stop
American Airlines Logo
5:31 pm - 12:24 am
BOS
-
SEA
9h 53m
1 stop
$293American Airlines
Wed, Mar 11 - Wed, Mar 18
Frontier Logo
1:16 pm - 1:13 am
SEA
-
BOS
32h 57m
2 stops
Frontier Logo
6:00 am - 11:19 am
BOS
-
SEA
32h 19m
2 stops
$295Frontier
Thu, Feb 26 - Sun, Mar 1
JetBlue Logo
11:30 am - 8:05 pm
SEA
-
BOS
5h 35mnonstop
JetBlue Logo
7:00 am - 10:20 am
BOS
-
SEA
6h 20mnonstop
$296JetBlue
Thu, May 28 - Tue, Jun 2
Delta Logo
11:50 am - 8:30 pm
SEA
-
BOS
5h 40mnonstop
Delta Logo
11:00 am - 2:23 pm
BOS
-
SEA
6h 23mnonstop
$297Delta
Wed, May 20 - Wed, May 27
Alaska Airlines Logo
3:33 pm - 11:59 pm
SEA
-
BOS
5h 26mnonstop
Alaska Airlines Logo
7:00 pm - 10:29 pm
BOS
-
SEA
6h 29mnonstop
$298Alaska Airlines
Wed, Jun 10 - Mon, Jun 15
Alaska Airlines Logo
11:30 am - 5:53 am
SEA
-
BOS
15h 23m
1 stop
Alaska Airlines Logo
9:00 am - 12:25 pm
BOS
-
SEA
6h 25mnonstop
$300Alaska Airlines
Wed, Mar 18 - Wed, Apr 1
Alaska Airlines Logo
10:40 pm - 6:54 am
SEA
-
BOS
5h 14mnonstop
Alaska Airlines Logo
4:36 pm - 10:18 pm
BOS
-
SEA
8h 42m
1 stop
$302Alaska Airlines
Mon, Feb 16 - Wed, Feb 25
United Airlines Logo
7:05 pm - 6:04 am
SEA
-
BOS
7h 59m
1 stop
United Airlines Logo
5:45 am - 11:40 am
BOS
-
SEA
8h 55m
1 stop
$303United Airlines
Wed, May 20 - Wed, May 27

Alaska Airlines flights from Seattle to Boston

Our best Alaska Airlines deals on Seattle to Boston flight tickets
Alaska Airlines
Jun 10
SEA3:33 pmSeattle/Tacoma Intl
5h 26m
BOS11:59 pmBoston Logan Intl
Jun 15
BOS7:00 pmBoston Logan Intl
6h 29m
SEA10:29 pmSeattle/Tacoma Intl
$298
Alaska Airlines
Mar 18
SEA11:30 amSeattle/Tacoma Intl
15h 23m
1 stop
BOS5:53 amBoston Logan Intl
Apr 1
BOS9:00 amBoston Logan Intl
6h 25m
SEA12:25 pmSeattle/Tacoma Intl
$300
Alaska Airlines
Feb 16
SEA10:40 pmSeattle/Tacoma Intl
5h 14m
BOS6:54 amBoston Logan Intl
Feb 25
BOS4:36 pmBoston Logan Intl
8h 42m
1 stop
SEA10:18 pmSeattle/Tacoma Intl
$302

Southwest flights from Seattle to Boston

Our best Southwest deals on Seattle to Boston flight tickets
Southwest
Feb 25
SEA6:05 amSeattle/Tacoma Intl
11h 45m
2 stops
BOS8:50 pmBoston Logan Intl
Feb 28
BOS2:10 pmBoston Logan Intl
11h 40m
2 stops
SEA10:50 pmSeattle/Tacoma Intl
$312
Southwest
Mar 17
SEA9:00 amSeattle/Tacoma Intl
11h 50m
1 stop
BOS11:50 pmBoston Logan Intl
Apr 1
BOS2:00 pmBoston Logan Intl
11h 30m
2 stops
SEA10:30 pmSeattle/Tacoma Intl
$328
Southwest
Feb 26
SEA7:25 amSeattle/Tacoma Intl
12h 30m
1 stop
BOS10:55 pmBoston Logan Intl
Mar 2
BOS6:35 amBoston Logan Intl
15h 05m
2 stops
SEA6:40 pmSeattle/Tacoma Intl
$338

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 832,500 searches. Data last updated January 29, 2026.
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

Wed 3/4

7:30 am-3:59 pm

Nonstop5h 29m

Boston Logan Intl

Tue 3/10

7:44 pm-8:43 am

1 stop15h 59m

$291

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Fri 5/1

11:26 pm-11:33 am

1 stop9h 07m

Boston Logan Intl

Sat 5/9

4:47 pm-10:26 pm

1 stop8h 39m

$292

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Wed 3/11

12:07 am-10:46 am

1 stop7h 39m

Boston Logan Intl

Wed 3/18

5:31 pm-12:24 am

1 stop9h 53m

$293

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Thu 2/26

1:16 pm-1:13 am

2 stops32h 57m

Boston Logan Intl

Sun 3/1

6:00 am-11:19 am

2 stops32h 19m

$295

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Thu 5/28

11:30 am-8:05 pm

Nonstop5h 35m

Boston Logan Intl

Tue 6/2

7:00 am-10:20 am

Nonstop6h 20m

$296

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Wed 5/20

11:50 am-8:30 pm

Nonstop5h 40m

Boston Logan Intl

Wed 5/27

11:00 am-2:23 pm

Nonstop6h 23m

$297

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Wed 6/10

3:33 pm-11:59 pm

Nonstop5h 26m

Boston Logan Intl

Mon 6/15

7:00 pm-10:29 pm

Nonstop6h 29m

$298

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Wed 3/18

11:30 am-5:53 am

1 stop15h 23m

Boston Logan Intl

Wed 4/1

9:00 am-12:25 pm

Nonstop6h 25m

$300

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Mon 2/16

10:40 pm-6:54 am

Nonstop5h 14m

Boston Logan Intl

Wed 2/25

4:36 pm-10:18 pm

1 stop8h 42m

$302

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Wed 5/20

7:05 pm-6:04 am

1 stop7h 59m

Boston Logan Intl

Wed 5/27

5:45 am-11:40 am

1 stop8h 55m

$303

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?

In general, March is the cheapest month to fly from Seattle to Boston. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $287. If you aren’t able to travel during the month of March, then book flights to Boston from Seattle during February instead. Flights to Boston in February, while not as cheap as those in March, still average around $307.

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

The cheapest day to depart from Seattle to Boston is on a Wednesday when prices can be found for as low as $358. Be sure to avoid booking your departure on a Monday as prices are generally higher than usual. According to our data, the average ticket price to Boston on Monday is $431.

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

According to our data, the cheapest time of day to fly to Boston is at noon. momondo users have found flights departing from Seattle to Boston at noon for as low as $232. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. In the morning is when there is more demand to fly to Boston, so prices are often more expensive at around $427 per ticket.

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 $367 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 $309 on momondo.

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

There are 4 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.

Can stopping save me money on Seattle to Boston flights?

You could potentially save up to 7% on your flight if you consider stops on a Seattle to Boston flight.

How have Seattle to Boston flight prices changed over time?

As of January 2026, prices for Seattle to Boston flights are approximately 20% more expensive 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

$202

Fastest flight time

5h 14m

Direct flights

Every day

Airports in Boston

1 airport
The best one-way flight to Boston from Seattle in the past 72 hours is $202. The best round-trip flight deal from Seattle to Boston found on momondo in the last 72 hours is $337.
The fastest flight from Seattle to Boston takes 5h 14m
Direct flights go from Seattle to Boston every day.
There is 1 airport in Boston. From Seattle there are direct flights to Boston Logan Intl (BOS).
Search flight deals

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

    Boston Logan Intl is 2484.0 mi away from Seattle/Tacoma Intl. A reasonable flight in good conditions will take 5h 14m.

  • 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 refresh daily.

  • 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 a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to 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 travel and health documents required for your trip to Boston Logan Intl Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Boston Logan Intl Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

  • 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
Hawaiian AirlinesPriceFrom $118Free CancellationRating
7.8
2,830 reviews
Search Hawaiian Airlines flights
JetBluePriceFrom $119Free CancellationRating
7.2
2,891 reviews
Search JetBlue flights
DeltaPriceFrom $142Free CancellationRating
7.9
8,127 reviews
Search Delta flights
United AirlinesPriceFrom $178Free CancellationRating
7.4
9,215 reviews
Search United Airlines flights
American AirlinesPriceFrom $196Free CancellationRating
7.2
11,206 reviews
Search American Airlines flights
Sun Country AirPriceFrom $223Free CancellationRating
6.9
343 reviews
Search Sun Country Air flights
Alaska AirlinesPriceFrom $237Free CancellationRating
8.0
11,808 reviews
Search Alaska Airlines flights
SouthwestPriceFrom $281Free CancellationRating
8.0
4,267 reviews
Search Southwest flights

  • Alaska Airlines Flights From Seattle to Boston

    The lowest priced Alaska Airlines flight from Seattle to Boston from the last 72 hours was $237. Generally, Alaska Airlines has 8 flights on this route every week with an average price of $463. Alaska Airlines is rated 8.0/10 by our users.

  • Delta Flights From Seattle to Boston

    The best Delta deal for Seattle to Boston flight tickets found on momondo in the last 72 hours was $142, round-trip. It should be noted that an average Delta flight deal for this route in this time was higher, at $372 round-trip. Delta operates 8 flights out of Seattle into Boston in an average week, so prices vary by time and availability. 8,127 Delta reviews by users on momondo have scored the airline at 7.9/10.

Traveling to a place near Boston?

Book flights to Boston if you plan to visit one of these locations
Hampton Beach
Salem
Ogunquit
Old Orchard Beach
Hampton
York Beach
Kennebunkport
Plymouth
South Yarmouth
Cambridge
Narragansett
Gloucester
Falmouth
Nashua
Brockton
Laconia
Sturbridge
Chatham
Warwick
Concord

Why use momondo?

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

It is quick and easy to find Seattle to Boston flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Boston that suits you.

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

All flight searches from Seattle to Boston on momondo can be filtered to show those which offer flexible booking policies.

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

momondo helps you find the best flight between Seattle and Boston by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

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

If you are simply researching potential flights to Boston, momondo offers a useful price alert feature which will track prices for flights to Boston from Seattle and alert you when they change.

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.
Start using Trips
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