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Cheap flights from Seattle to Boston from $109

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 9/24. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Cheap round-trip flights

Hawaiian Airlines Logo
3:59 pm - 12:27 amSEA-BOS
5h 28mnonstop
Hawaiian Airlines Logo
7:20 am - 10:35 amBOS-SEA
6h 15mnonstop
$217Hawaiian Airlines
Find Deal
Tue, Sep 30 - Wed, Oct 8
Delta Logo
3:38 pm - 11:59 pmSEA-BOS
5h 21mnonstop
Delta Logo
6:45 pm - 10:01 pmBOS-SEA
6h 16mnonstop
$227Delta
Find Deal
Tue, Sep 16 - Mon, Sep 22
Alaska Airlines Logo
6:59 pm - 5:40 pmSEA-BOS
19h 41m1 stop
Alaska Airlines Logo
7:45 am - 2:50 pmBOS-SEA
10h 05m1 stop
$236Alaska Airlines
Find Deal
Wed, Sep 3 - Tue, Sep 9
Alaska Airlines Logo
3:59 pm - 12:27 amSEA-BOS
5h 28mnonstop
Alaska Airlines Logo
7:20 am - 10:33 amBOS-SEA
6h 13mnonstop
$237Alaska Airlines
Find Deal
Thu, Sep 18 - Thu, Sep 25
Alaska Airlines Logo
8:59 pm - 5:40 pmSEA-BOS
17h 41m1 stop
Alaska Airlines Logo
7:20 am - 10:33 amBOS-SEA
6h 13mnonstop
$242Alaska Airlines
Find Deal
Tue, Sep 2 - Tue, Sep 9
JetBlue Logo
9:14 pm - 5:29 amSEA-BOS
5h 15mnonstop
JetBlue Logo
7:00 am - 10:20 amBOS-SEA
6h 20mnonstop
$247JetBlue
Find Deal
Tue, Aug 12 - Tue, Aug 19
JetBlue Logo
9:14 pm - 5:29 amSEA-BOS
5h 15mnonstop
JetBlue Logo
6:29 pm - 9:59 pmBOS-SEA
6h 30mnonstop
$248JetBlue
Find Deal
Mon, Aug 11 - Tue, Aug 19
United Airlines Logo
7:00 pm - 5:59 amSEA-BOS
7h 59m1 stop
United Airlines Logo
5:05 pm - 10:59 pmBOS-SEA
8h 54m1 stop
$257United Airlines
Find Deal
Thu, Sep 18 - Mon, Sep 22
United Airlines Logo
11:54 pm - 9:56 amSEA-BOS
7h 02m1 stop
United Airlines Logo
7:10 am - 1:33 pmBOS-SEA
9h 23m1 stop
$299United Airlines
Find Deal
Fri, Aug 29 - Mon, Sep 1
American Airlines Logo
12:46 am - 11:50 amSEA-BOS
8h 04m1 stop
American Airlines Logo
5:28 am - 2:15 pmBOS-SEA
11h 47m1 stop
$311American Airlines
Find Deal
Mon, Aug 25 - Sun, Aug 31

Alaska Airlines flights from Seattle to Boston

Our best Alaska Airlines deals on Seattle to Boston flight tickets
Alaska Airlines
Sep 3
SEA6:59 pmSeattle/Tacoma Intl
19h 41m
1 stop
BOS5:40 pmBoston Logan Intl
Sep 9
BOS7:45 amBoston Logan Intl
10h 05m
1 stop
SEA2:50 pmSeattle/Tacoma Intl
Alaska Airlines
Sep 18
SEA3:59 pmSeattle/Tacoma Intl
5h 28m
BOS12:27 amBoston Logan Intl
Sep 25
BOS7:20 amBoston Logan Intl
6h 13m
SEA10:33 amSeattle/Tacoma Intl
Alaska Airlines
Sep 2
SEA8:59 pmSeattle/Tacoma Intl
17h 41m
1 stop
BOS5:40 pmBoston Logan Intl
Sep 9
BOS7:20 amBoston Logan Intl
6h 13m
SEA10:33 amSeattle/Tacoma Intl

JetBlue flights from Seattle to Boston

Our best JetBlue deals on Seattle to Boston flight tickets
JetBlue
Aug 12
SEA9:14 pmSeattle/Tacoma Intl
5h 15m
BOS5:29 amBoston Logan Intl
Aug 19
BOS7:00 amBoston Logan Intl
6h 20m
SEA10:20 amSeattle/Tacoma Intl
JetBlue
Aug 11
SEA9:14 pmSeattle/Tacoma Intl
5h 15m
BOS5:29 amBoston Logan Intl
Aug 19
BOS6:29 pmBoston Logan Intl
6h 30m
SEA9:59 pmSeattle/Tacoma Intl
JetBlue
Aug 11
SEA9:14 pmSeattle/Tacoma Intl
5h 15m
BOS5:29 amBoston Logan Intl
Aug 19
BOS7:00 amBoston Logan Intl
6h 20m
SEA10:20 amSeattle/Tacoma Intl

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 Tuesday when prices can be found for as low as $352. 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 $454.

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 $338. 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 $425 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 $358 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 $307 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 July 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

$109

Fastest flight time

5h 12m

Direct flights

Every day

Airports in Boston

1 airport
The best one-way flight to Boston from Seattle in the past 72 hours is $109. The best round-trip flight deal from Seattle to Boston found on momondo in the last 72 hours is $217.
The fastest flight from Seattle to Boston takes 5h 12m
Direct flights go from Seattle to Boston every day.
There is 1 airport near Boston: Boston Logan Intl (BOS)

  • 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 12m.

  • 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
2,545 reviews
Search Hawaiian Airlines flights
JetBluePriceFrom $139Free CancellationRating
7.3
2,916 reviews
Search JetBlue flights
Spirit AirlinesPriceFrom $145Free CancellationRating
6.3
8,086 reviews
Search Spirit Airlines flights
DeltaPriceFrom $160Free CancellationRating
8.0
7,982 reviews
Search Delta flights
Sun Country AirPriceFrom $198Free CancellationRating
6.9
339 reviews
Search Sun Country Air flights
American AirlinesPriceFrom $216Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
Alaska AirlinesPriceFrom $232Free CancellationRating
8.0
10,000 reviews
Search Alaska Airlines flights
United AirlinesPriceFrom $236Free CancellationRating
7.4
8,861 reviews
Search United Airlines flights
SouthwestPriceFrom $326Free CancellationRating
8.0
4,266 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 $160. Generally, Delta has 11 flights on this route every week with an average price of $383. 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 $232, round-trip. It should be noted that an average Alaska Airlines flight deal for this route in this time was higher, at $465 round-trip. Alaska Airlines operates 25 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
Old Orchard Beach
Hampton
York Beach
Plymouth
Nashua
Cambridge
Laconia
Kennebunkport
Narragansett
Brockton
Concord
Everett
Gloucester
South Yarmouth
Wells
Warwick
Revere

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.


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1 adult
Tue 7/8
Tue 7/15

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