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Cheap flights from Seattle to Boston from $75

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 9/3. 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

Southwest Logo
9:10 pm - 10:00 amSEA-BOS
9h 50m1 stop
Southwest Logo
5:40 pm - 11:35 pmBOS-SEA
8h 55m1 stop
$150Southwest
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Wed, Sep 3 - Tue, Sep 9
Southwest Logo
9:10 pm - 8:10 amSEA-BOS
8h 00m1 stop
Southwest Logo
5:40 pm - 11:35 pmBOS-SEA
8h 55m1 stop
$174Southwest
Find Deal
Tue, Sep 16 - Wed, Sep 24
Alaska Airlines Logo
3:59 pm - 12:27 amSEA-BOS
5h 28mnonstop
Alaska Airlines Logo
7:20 am - 10:33 amBOS-SEA
6h 13mnonstop
$176Alaska Airlines
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Mon, Sep 22 - Mon, Sep 29
Hawaiian Airlines Logo
3:59 pm - 12:20 amSEA-BOS
5h 21mnonstop
Hawaiian Airlines Logo
6:23 pm - 9:51 pmBOS-SEA
6h 28mnonstop
$183Hawaiian Airlines
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Sat, Nov 8 - Wed, Nov 12
Hawaiian Airlines Logo
3:59 pm - 12:27 amSEA-BOS
5h 28mnonstop
Hawaiian Airlines Logo
7:20 am - 10:33 amBOS-SEA
6h 13mnonstop
$187Hawaiian Airlines
Find Deal
Mon, Sep 22 - Mon, Sep 29
JetBlue Logo
11:30 am - 8:23 pmSEA-BOS
5h 53mnonstop
JetBlue Logo
7:00 am - 10:19 amBOS-SEA
6h 19mnonstop
$190JetBlue
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Mon, Sep 22 - Mon, Sep 29
JetBlue Logo
11:30 am - 8:23 pmSEA-BOS
5h 53mnonstop
JetBlue Logo
7:00 am - 10:19 amBOS-SEA
6h 19mnonstop
$193JetBlue
Find Deal
Mon, Sep 22 - Mon, Sep 29
Delta Logo
10:05 pm - 6:35 amSEA-BOS
5h 30mnonstop
Delta Logo
6:45 pm - 10:01 pmBOS-SEA
6h 16mnonstop
$198Delta
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Mon, Sep 22 - Mon, Sep 29
Delta Logo
10:05 pm - 6:35 amSEA-BOS
5h 30mnonstop
Delta Logo
6:45 pm - 10:01 pmBOS-SEA
6h 16mnonstop
$217Delta
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Fri, Sep 19 - Sat, Sep 27
Alaska Airlines Logo
3:59 pm - 12:27 amSEA-BOS
5h 28mnonstop
Alaska Airlines Logo
7:45 am - 2:50 pmBOS-SEA
10h 05m1 stop
$227Alaska Airlines
Find Deal
Tue, Sep 16 - Tue, Sep 23

Southwest flights from Seattle to Boston

Our best Southwest deals on Seattle to Boston flight tickets
Southwest
Sep 3
SEA9:10 pmSeattle/Tacoma Intl
9h 50m
1 stop
BOS10:00 amBoston Logan Intl
Sep 9
BOS5:40 pmBoston Logan Intl
8h 55m
1 stop
SEA11:35 pmSeattle/Tacoma Intl
$150
Find similar
Southwest
Sep 16
SEA9:10 pmSeattle/Tacoma Intl
8h 00m
1 stop
BOS8:10 amBoston Logan Intl
Sep 24
BOS5:40 pmBoston Logan Intl
8h 55m
1 stop
SEA11:35 pmSeattle/Tacoma Intl
$174
Find similar
Southwest
Sep 16
SEA9:10 pmSeattle/Tacoma Intl
8h 00m
1 stop
BOS8:10 amBoston Logan Intl
Sep 30
BOS9:25 amBoston Logan Intl
8h 55m
1 stop
SEA3:20 pmSeattle/Tacoma Intl
$180
Find similar

American Airlines flights from Seattle to Boston

Our best American Airlines deals on Seattle to Boston flight tickets
American Airlines
Sep 16
SEA1:02 pmSeattle/Tacoma Intl
7h 51m
1 stop
BOS11:53 pmBoston Logan Intl
Sep 23
BOS8:35 amBoston Logan Intl
11h 54m
1 stop
SEA5:29 pmSeattle/Tacoma Intl
$211
Find similar
American Airlines
Sep 17
SEA1:02 pmSeattle/Tacoma Intl
7h 51m
1 stop
BOS11:53 pmBoston Logan Intl
Sep 24
BOS11:28 amBoston Logan Intl
9h 01m
1 stop
SEA5:29 pmSeattle/Tacoma Intl
$221
Find similar
American Airlines
Nov 6
SEA12:59 amSeattle/Tacoma Intl
8h 49m
1 stop
BOS12:48 pmBoston Logan Intl
Nov 11
BOS1:42 pmBoston Logan Intl
12h 36m
1 stop
SEA11:18 pmSeattle/Tacoma Intl
$231
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 August 5, 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

Wed 9/3

9:10 pm-10:00 am

1 stop9h 50m

Boston Logan Intl

Tue 9/9

5:40 pm-11:35 pm

1 stop8h 55m

$150

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Tue 9/16

9:10 pm-8:10 am

1 stop8h 00m

Boston Logan Intl

Wed 9/24

5:40 pm-11:35 pm

1 stop8h 55m

$174

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Mon 9/22

3:59 pm-12:27 am

Nonstop5h 28m

Boston Logan Intl

Mon 9/29

7:20 am-10:33 am

Nonstop6h 13m

$176

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Sat 11/8

3:59 pm-12:20 am

Nonstop5h 21m

Boston Logan Intl

Wed 11/12

6:23 pm-9:51 pm

Nonstop6h 28m

$183

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Mon 9/22

3:59 pm-12:27 am

Nonstop5h 28m

Boston Logan Intl

Mon 9/29

7:20 am-10:33 am

Nonstop6h 13m

$187

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Mon 9/22

11:30 am-8:23 pm

Nonstop5h 53m

Boston Logan Intl

Mon 9/29

7:00 am-10:19 am

Nonstop6h 19m

$190

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Mon 9/22

11:30 am-8:23 pm

Nonstop5h 53m

Boston Logan Intl

Mon 9/29

7:00 am-10:19 am

Nonstop6h 19m

$193

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Mon 9/22

10:05 pm-6:35 am

Nonstop5h 30m

Boston Logan Intl

Mon 9/29

6:45 pm-10:01 pm

Nonstop6h 16m

$198

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Fri 9/19

10:05 pm-6:35 am

Nonstop5h 30m

Boston Logan Intl

Sat 9/27

6:45 pm-10:01 pm

Nonstop6h 16m

$217

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Tue 9/16

3:59 pm-12:27 am

Nonstop5h 28m

Boston Logan Intl

Tue 9/23

7:45 am-2:50 pm

1 stop10h 05m

$227

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 $217. 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 $267.

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 $343. 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 $423.

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 in the afternoon. momondo users have found flights departing from Seattle to Boston in the afternoon for as low as $331. 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 $413 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 $351 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 $308 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.

How have Seattle to Boston flight prices changed over time?

As of August 2025, prices for Seattle to Boston flights are approximately 9% 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

$75

Fastest flight time

5h 20m

Direct flights

Every day

Airports in Boston

1 airport
The best one-way flight to Boston from Seattle in the past 72 hours is $75. The best round-trip flight deal from Seattle to Boston found on momondo in the last 72 hours is $150.
The fastest flight from Seattle to Boston takes 5h 20m
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?

    Boston Logan Intl is 2484.0 mi away from Seattle/Tacoma Intl. A reasonable flight in good conditions will take 5h 20m.

  • 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 $120Free CancellationRating
7.8
2,623 reviews
Search Hawaiian Airlines flights
JetBluePriceFrom $133Free CancellationRating
7.2
2,914 reviews
Search JetBlue flights
Spirit AirlinesPriceFrom $138Free CancellationRating
6.3
8,054 reviews
Search Spirit Airlines flights
DeltaPriceFrom $153Free CancellationRating
8.0
7,987 reviews
Search Delta flights
American AirlinesPriceFrom $216Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
Sun Country AirPriceFrom $223Free CancellationRating
6.9
334 reviews
Search Sun Country Air flights
Alaska AirlinesPriceFrom $227Free CancellationRating
8.0
10,000 reviews
Search Alaska Airlines flights
United AirlinesPriceFrom $271Free CancellationRating
7.4
8,915 reviews
Search United Airlines flights
SouthwestPriceFrom $281Free CancellationRating
8.0
4,246 reviews
Search Southwest flights

  • Delta Flights From Seattle to Boston

    The lowest priced Delta flight from Seattle to Boston from the last 72 hours was $153. Generally, Delta has 16 flights on this route every week with an average price of $378. Delta is rated 8.0/10 by our users.

  • Alaska Airlines Flights From Seattle to Boston

    The best Alaska Airlines deal for Seattle to Boston flight tickets found on momondo in the last 72 hours was $227, round-trip. It should be noted that an average Alaska Airlines flight deal for this route in this time was higher, at $455 round-trip. Alaska Airlines operates 27 flights out of Seattle into Boston in an average week, so prices vary by time and availability. 10,000 Alaska Airlines 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
Hampton
Old Orchard Beach
York Beach
Plymouth
Kennebunkport
Nashua
Cambridge
Narragansett
Laconia
Brockton
South Yarmouth
Gloucester
Concord
Everett
Wells
Falmouth
Sturbridge

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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