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Cheap flights from Seattle to Boston from $161

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 1/23. 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.
United Airlines Logo
7:10 pm - 5:52 am
SEA
-
BOS
7h 42m1 stop
United Airlines Logo
11:00 am - 6:26 pm
BOS
-
SEA
10h 26m1 stop
$300United Airlines
Thu, Feb 19 - Tue, Feb 24
Alaska Airlines Logo
7:55 am - 4:20 pm
SEA
-
BOS
5h 25mnonstop
Alaska Airlines Logo
6:44 pm - 10:17 pm
BOS
-
SEA
6h 33mnonstop
$301Alaska Airlines
Fri, Jan 23 - Fri, Jan 23
Hawaiian Airlines Logo
3:40 pm - 11:54 pm
SEA
-
BOS
5h 14mnonstop
Hawaiian Airlines Logo
5:20 pm - 10:33 pm
BOS
-
SEA
8h 13m1 stop
$302Hawaiian Airlines
Thu, Jan 22 - Wed, Jan 28
American Airlines Logo
6:12 am - 8:30 pm
SEA
-
BOS
11h 18m1 stop
American Airlines Logo
12:30 pm - 10:20 pm
BOS
-
SEA
12h 50m1 stop
$303American Airlines
Tue, Jan 27 - Sat, Jan 31
Multiple Airlines Logo
3:42 pm - 11:59 pm
SEA
-
BOS
5h 17mnonstop
Multiple Airlines Logo
6:24 pm - 10:00 pm
BOS
-
SEA
6h 36mnonstop
$304Multiple Airlines
Thu, Feb 12 - Thu, Feb 19
Delta Logo
11:17 am - 6:14 am
SEA
-
BOS
15h 57m1 stop
Delta Logo
6:45 pm - 10:13 pm
BOS
-
SEA
6h 28mnonstop
$305Delta
Wed, Jan 21 - Mon, Jan 26
Alaska Airlines Logo
10:40 pm - 6:54 am
SEA
-
BOS
5h 14mnonstop
Alaska Airlines Logo
7:00 am - 10:33 am
BOS
-
SEA
6h 33mnonstop
$306Alaska Airlines
Thu, Mar 5 - Sun, Mar 15
Alaska Airlines Logo
7:55 am - 4:20 pm
SEA
-
BOS
5h 25mnonstop
Alaska Airlines Logo
7:00 am - 10:34 am
BOS
-
SEA
6h 34mnonstop
$307Alaska Airlines
Wed, Jan 21 - Mon, Jan 26
Southwest Logo
6:05 am - 4:50 pm
SEA
-
BOS
7h 45m1 stop
Southwest Logo
5:30 am - 1:15 pm
BOS
-
SEA
10h 45m1 stop
$312Southwest
Thu, Jan 22 - Wed, Jan 28
Delta Logo
5:50 pm - 10:51 am
SEA
-
BOS
14h 01m2 stops
Delta Logo
5:50 am - 6:23 pm
BOS
-
SEA
15h 33m2 stops
$315Delta
Tue, Jan 20 - Tue, Jan 27

United Airlines flights from Seattle to Boston

Our best United Airlines deals on Seattle to Boston flight tickets
United Airlines
Feb 19
SEA7:10 pmSeattle/Tacoma Intl
7h 42m
1 stop
BOS5:52 amBoston Logan Intl
Feb 24
BOS11:00 amBoston Logan Intl
10h 26m
1 stop
SEA6:26 pmSeattle/Tacoma Intl
$300
Find similar
United Airlines
Jan 12
SEA8:10 amSeattle/Tacoma Intl
7h 47m
1 stop
BOS6:57 pmBoston Logan Intl
Jan 28
BOS10:56 amBoston Logan Intl
10h 30m
1 stop
SEA6:26 pmSeattle/Tacoma Intl
$307
Find similar
United Airlines
Jan 12
SEA10:58 amSeattle/Tacoma Intl
9h 51m
2 stops
BOS11:49 pmBoston Logan Intl
Jan 28
BOS12:45 pmBoston Logan Intl
8h 29m
1 stop
SEA6:14 pmSeattle/Tacoma Intl
$317
Find similar

Delta flights from Seattle to Boston

Our best Delta deals on Seattle to Boston flight tickets
Delta
Jan 21
SEA9:55 amSeattle/Tacoma Intl
17h 19m
1 stop
BOS6:14 amBoston Logan Intl
Jan 25
BOS7:15 amBoston Logan Intl
6h 30m
SEA10:45 amSeattle/Tacoma Intl
$305
Find similar
Delta
Jan 20
SEA5:50 pmSeattle/Tacoma Intl
14h 01m
2 stops
BOS10:51 amBoston Logan Intl
Jan 28
BOS5:50 amBoston Logan Intl
15h 33m
2 stops
SEA6:23 pmSeattle/Tacoma Intl
$315
Find similar
Delta
Jan 25
SEA5:50 pmSeattle/Tacoma Intl
14h 01m
2 stops
BOS10:51 amBoston Logan Intl
Jan 28
BOS5:50 amBoston Logan Intl
15h 33m
2 stops
SEA6:23 pmSeattle/Tacoma Intl
$316
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 832,500 searches. Data last updated December 30, 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

Thu 2/19

7:10 pm-5:52 am

1 stop7h 42m

Boston Logan Intl

Tue 2/24

11:00 am-6:26 pm

1 stop10h 26m

$300

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Fri 1/23

7:55 am-4:20 pm

Nonstop5h 25m

Boston Logan Intl

Fri 1/23

6:44 pm-10:17 pm

Nonstop6h 33m

$301

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Thu 1/22

3:40 pm-11:54 pm

Nonstop5h 14m

Boston Logan Intl

Wed 1/28

5:20 pm-10:33 pm

1 stop8h 13m

$302

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Tue 1/27

6:12 am-8:30 pm

1 stop11h 18m

Boston Logan Intl

Sat 1/31

12:30 pm-10:20 pm

1 stop12h 50m

$303

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Thu 2/12

3:42 pm-11:59 pm

Nonstop5h 17m

Boston Logan Intl

Thu 2/19

6:24 pm-10:00 pm

Nonstop6h 36m

$304

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Wed 1/21

11:17 am-6:14 am

1 stop15h 57m

Boston Logan Intl

Mon 1/26

6:45 pm-10:13 pm

Nonstop6h 28m

$305

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Thu 3/5

10:40 pm-6:54 am

Nonstop5h 14m

Boston Logan Intl

Sun 3/15

7:00 am-10:33 am

Nonstop6h 33m

$306

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Wed 1/21

7:55 am-4:20 pm

Nonstop5h 25m

Boston Logan Intl

Mon 1/26

7:00 am-10:34 am

Nonstop6h 34m

$307

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Thu 1/22

6:05 am-4:50 pm

1 stop7h 45m

Boston Logan Intl

Wed 1/28

5:30 am-1:15 pm

1 stop10h 45m

$312

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Tue 1/20

5:50 pm-10:51 am

2 stops14h 01m

Boston Logan Intl

Tue 1/27

5:50 am-6:23 pm

2 stops15h 33m

$315

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, January 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 $264. If you aren’t able to travel during the month of January, then book flights to Boston from Seattle during March instead. Flights to Boston in March, while not as cheap as those in January, still average around $279.

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 $349. Be sure to avoid booking your departure on a Sunday as prices are generally higher than usual. According to our data, the average ticket price to Boston on Sunday is $426.

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 $246. 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 $419 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 $360 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 $305 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 23% 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 December 2025, prices for Seattle to Boston flights are approximately 19% 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

$279

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 $279. The best round-trip flight deal from Seattle to Boston found on momondo in the last 72 hours is $346.
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
2,821 reviews
Search Hawaiian Airlines flights
JetBluePriceFrom $145Free CancellationRating
7.2
2,902 reviews
Search JetBlue flights
DeltaPriceFrom $167Free CancellationRating
7.9
8,014 reviews
Search Delta flights
American AirlinesPriceFrom $196Free CancellationRating
7.2
11,075 reviews
Search American Airlines flights
United AirlinesPriceFrom $209Free CancellationRating
7.4
9,126 reviews
Search United Airlines flights
Sun Country AirPriceFrom $233Free CancellationRating
6.9
337 reviews
Search Sun Country Air flights
Alaska AirlinesPriceFrom $237Free CancellationRating
8.0
11,580 reviews
Search Alaska Airlines flights
SouthwestPriceFrom $281Free CancellationRating
8.0
4,251 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 11 flights on this route every week with an average price of $465. Alaska Airlines is rated 8.0/10 by our users.

  • Southwest Flights From Seattle to Boston

    The best Southwest deal for Seattle to Boston flight tickets found on momondo in the last 72 hours was $281, round-trip. It should be noted that an average Southwest flight deal for this route in this time was higher, at $344 round-trip. Southwest operates 2 flights out of Seattle into Boston in an average week, so prices vary by time and availability. 4,251 Southwest reviews by users on momondo have scored the airline at 8.0/10.

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
Plymouth
Kennebunkport
South Yarmouth
Cambridge
Narragansett
Gloucester
Falmouth
Nashua
Laconia
Brockton
Concord
Everett
Sturbridge
Warwick

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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