Which airlines fly to Boston?

JetBlue, Alaska Airlines and Delta are the top three most popular airlines that fly to Boston from Seattle according to our data. JetBlue is the first choice among our users, with 36% of people opting to fly with this airline when travelling to Boston. Keep in mind that there are 3 different airlines that fly to Boston on a routine basis, so you have a few additional options to choose from.

What is the most punctual flight time for Seattle to Boston flights?

Generally, flights departing at night tend to experience fewer delays. Flights departing in the early afternoon have, in the past, seen delays more frequently in comparison.

What is the cheapest airline that flies from Seattle/Tacoma Intl to Boston Logan Intl?

Alaska Airlines, United Airlines, and Delta are the most popular carriers operating from Seattle/Tacoma Intl to Boston Logan Intl

How many flights depart from Seattle to Boston on average per day?

As of October 2025, there are 7 flights per day flying from Seattle to Boston. The most common time of day flights depart is 3:00p.m., with 41% of flights taking off at noon.

Which airline has the best punctuality record on Seattle to Boston flights?

According to our data, KLM has had the lowest number of delays on this route over the last 12 months, with no flights being classified as delayed.

How often are flights from Seattle to Boston delayed?

Historically, on average around 16% of flights between Seattle and Boston have experienced a delay on any given week. The average delay length over the past 12 months has been 148 minutes.

How many flights depart from Seattle to Boston on average per week?

The number of flights available between Seattle and Boston is 49 per week as of October 2025. The most frequent departure day is Thu, with 55% of weekly flights leaving on this day.

What day of the week experiences the fewest flight delays on this route?

Tuesday is statistically the day of the week that experiences the fewest delays on this flight route. Thursday has historically seen more delays on average compared to the rest of the week.

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?

As of October 2025, there are 3 operators available to choose from 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.

C$ 137 Cheap Flights from Seattle to Boston in 2025/26

Q: What is the typical price of a round-trip flight between Seattle and Boston?

Prices are currently low for flights on this route. Typical prices usually range from C$ 315 to C$ 628. The lowest price recently found on this route was C$ 302.

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11:52 p.m. - 10:38 a.m.SEA-BOS

7h 46m1 stop

11:00 a.m. - 6:25 p.m.BOS-SEA

10h 25m1 stop

C$ 302United Airlines

Find Deal

Tue, 11 Nov - Tue, 18 Nov

3:59 p.m. - 12:20 a.m.SEA-BOS

5h 21mdirect

6:23 p.m. - 9:51 p.m.BOS-SEA

6h 28mdirect

C$ 330Alaska Airlines

Find Deal

Wed, 12 Nov - Wed, 19 Nov

7:13 p.m. - 5:56 a.m.SEA-BOS

7h 43m1 stop

11:00 a.m. - 6:25 p.m.BOS-SEA

10h 25m1 stop

C$ 336United Airlines

Find Deal

Fri, 14 Nov - Tue, 18 Nov

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

5h 21mdirect

7:00 a.m. - 10:34 a.m.BOS-SEA

6h 34mdirect

C$ 337Alaska Airlines

Find Deal

Thu, 11 Dec - Sun, 18 Jan

5:20 a.m. - 3:24 p.m.SEA-BOS

7h 04m1 stop

7:00 a.m. - 10:35 a.m.BOS-SEA

6h 35mdirect

C$ 344Alaska Airlines

Find Deal

Sat, 15 Nov - Thu, 20 Nov

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

5h 21mdirect

5:20 p.m. - 10:33 p.m.BOS-SEA

8h 13m1 stop

C$ 351Alaska Airlines

Find Deal

Thu, 11 Dec - Sun, 18 Jan

3:59 p.m. - 12:20 a.m.SEA-BOS

5h 21mdirect

4:46 p.m. - 11:32 p.m.BOS-SEA

9h 46m1 stop

C$ 354Alaska Airlines

Find Deal

Thu, 13 Nov - Wed, 19 Nov

10:25 p.m. - 6:55 a.m.SEA-BOS

5h 30mdirect

6:45 p.m. - 10:13 p.m.BOS-SEA

6h 28mdirect

C$ 415Delta

Find Deal

Tue, 16 Dec - Mon, 5 Jan

10:05 p.m. - 6:35 a.m.SEA-BOS

5h 30mdirect

7:15 a.m. - 10:45 a.m.BOS-SEA

6h 30mdirect

C$ 429Delta

Find Deal

Sun, 23 Nov - Thu, 4 Dec

9:35 a.m. - 10:15 p.m.SEA-BOS

9h 40m2 stops

5:00 p.m. - 10:55 p.m.BOS-SEA

8h 55m1 stop

C$ 435Southwest

Find Deal

Thu, 4 Dec - Wed, 10 Dec

United Airlines flights from Seattle to Boston

Our best United Airlines deals on Seattle to Boston flight tickets

United Airlines

11 Nov

SEA11:52 p.m.Seattle/Tacoma Intl

7h 46m

1 stop

BOS10:38 a.m.Boston Logan Intl

18 Nov

BOS11:00 a.m.Boston Logan Intl

10h 25m

1 stop

SEA6:25 p.m.Seattle/Tacoma Intl

C$ 302

Find similar

United Airlines

14 Nov

SEA7:13 p.m.Seattle/Tacoma Intl

7h 43m

1 stop

BOS5:56 a.m.Boston Logan Intl

18 Nov

BOS11:00 a.m.Boston Logan Intl

10h 25m

1 stop

SEA6:25 p.m.Seattle/Tacoma Intl

C$ 336

Find similar

United Airlines

11 Nov

SEA6:15 a.m.Seattle/Tacoma Intl

8h 07m

1 stop

BOS5:22 p.m.Boston Logan Intl

17 Nov

BOS6:00 a.m.Boston Logan Intl

8h 28m

1 stop

SEA11:28 a.m.Seattle/Tacoma Intl

C$ 350

Find similar

Alaska Airlines flights from Seattle to Boston

Our best Alaska Airlines deals on Seattle to Boston flight tickets

Alaska Airlines

12 Nov

SEA3:59 p.m.Seattle/Tacoma Intl

5h 21m

BOS12:20 a.m.Boston Logan Intl

19 Nov

BOS6:23 p.m.Boston Logan Intl

6h 28m

SEA9:51 p.m.Seattle/Tacoma Intl

C$ 330

Find similar

Alaska Airlines

11 Dec

SEA3:38 p.m.Seattle/Tacoma Intl

5h 21m

BOS11:59 p.m.Boston Logan Intl

18 Jan

BOS7:00 a.m.Boston Logan Intl

6h 34m

SEA10:34 a.m.Seattle/Tacoma Intl

C$ 337

Find similar

Alaska Airlines

15 Nov

SEA5:20 a.m.Seattle/Tacoma Intl

7h 04m

1 stop

BOS3:24 p.m.Boston Logan Intl

20 Nov

BOS7:00 a.m.Boston Logan Intl

6h 35m

SEA10:35 a.m.Seattle/Tacoma Intl

C$ 344

Find similar

Fly from

Fly to

Route

Depart

Return

Price

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Tue 11/11

11:52 p.m.-10:38 a.m.

1 stop7h 46m

Boston Logan Intl

Tue 18/11

11:00 a.m.-6:25 p.m.

1 stop10h 25m

C$ 302

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Wed 12/11

3:59 p.m.-12:20 a.m.

Nonstop5h 21m

Boston Logan Intl

Wed 19/11

6:23 p.m.-9:51 p.m.

Nonstop6h 28m

C$ 330

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Fri 14/11

7:13 p.m.-5:56 a.m.

1 stop7h 43m

Boston Logan Intl

Tue 18/11

11:00 a.m.-6:25 p.m.

1 stop10h 25m

C$ 336

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Thu 11/12

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

Nonstop5h 21m

Boston Logan Intl

Sun 18/1

7:00 a.m.-10:34 a.m.

Nonstop6h 34m

C$ 337

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Sat 15/11

5:20 a.m.-3:24 p.m.

1 stop7h 04m

Boston Logan Intl

Thu 20/11

7:00 a.m.-10:35 a.m.

Nonstop6h 35m

C$ 344

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Thu 11/12

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

Nonstop5h 21m

Boston Logan Intl

Sun 18/1

5:20 p.m.-10:33 p.m.

1 stop8h 13m

C$ 351

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Thu 13/11

3:59 p.m.-12:20 a.m.

Nonstop5h 21m

Boston Logan Intl

Wed 19/11

4:46 p.m.-11:32 p.m.

1 stop9h 46m

C$ 354

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Tue 16/12

10:25 p.m.-6:55 a.m.

Nonstop5h 30m

Boston Logan Intl

Mon 5/1

6:45 p.m.-10:13 p.m.

Nonstop6h 28m

C$ 415

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Sun 23/11

10:05 p.m.-6:35 a.m.

Nonstop5h 30m

Boston Logan Intl

Thu 4/12

7:15 a.m.-10:45 a.m.

Nonstop6h 30m

C$ 429

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Thu 4/12

9:35 a.m.-10:15 p.m.

2 stops9h 40m

Boston Logan Intl

Wed 10/12

5:00 p.m.-10:55 p.m.

1 stop8h 55m

C$ 435

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

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

Prices

Airlines

Delays

Other information

What is the typical price of a round-trip flight between Seattle and Boston?

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$ 302, 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$ 372.

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 Monday. momondo users have found tickets for Monday departures for as low as C$ 330. 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$ 1,277. 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 at noon is the least expensive time of day to depart. momondo users have found prices as low as C$ 358 when looking at flights departing at noon. Flights in the morning are often more expensive with an average ticket price of C$ 833.

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$ 482 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$ 418 on momondo.

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

There is only 1 cabin class 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 October 2025, prices for Seattle to Boston flights are approximately 16% 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$ 318
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$ 318. The best round-trip flight deal from Seattle to Boston found on momondo in the last 72 hours is C$ 678.

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?
As of October 2025, there are 3 operators available to choose from 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?
Based on momondo bookings for this flight route, the most popular plane model on flight routes from Seattle to Boston is Airbus A321neo (23.49% of total bookings). The next most popular plane models are Boeing 737 (22.07%), Boeing 737 MAX 9 (18.42%), and Airbus A321-100/200 (15.70%).
What is the most popular airline from Seattle to Boston?
Based on momondo bookings for flights between Seattle and Boston, the leading airline is JetBlue, making up 36% of the total bookings. Other popular airlines include Alaska Airlines with 35% and Delta with 29%.

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
Delta	PriceFrom C$ 137	Free Cancellation	Rating 7.9 7,998 reviews	Search Delta flights
Alaska Airlines	PriceFrom C$ 169	Free Cancellation	Rating 8.0 11,219 reviews	Search Alaska Airlines flights
JetBlue	PriceFrom C$ 179	Free Cancellation	Rating 7.2 2,906 reviews	Search JetBlue flights

Alaska Airlines Flights From Seattle to Boston
Alaska Airlines flies from Seattle to Boston around 4 times per week, with 11,219 momondo users rating the airline 8.0/10. The cheapest Alaska Airlines deal from Seattle to Boston in the last 72 hours was C$ 169 (round-trip), much lower than the average airfare cost of C$ 530 for Alaska Airlines flights on this route.
Delta Flights From Seattle to Boston
Delta is also a popular choice for this route. Delta flight deals for Seattle to Boston start from as low as C$ 137 round-trip, depending on your selected dates, with average Delta deals seen on momondo around C$ 330. Delta operates 4 flights to Boston from Seattle in an average week. Users have rated it 7.9/10 across 7,998 reviews.

Hampton Beach

Old Orchard Beach

Salem

Everett

Ogunquit

Wells

Cambridge

Waltham

West Yarmouth

Needham

Saco

Middletown

Westbrook

Burlington

Sturbridge

Scarborough

Cape Neddick

Quincy

Peabody

Seabrook

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

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Cheap flights from Seattle to Boston from C$ 166

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 5/12. 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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Alaska Airlines flights from Seattle to Boston

Our best Alaska Airlines deals on Seattle to Boston flight tickets

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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 typical price of a round-trip flight between Seattle and Boston?

What is the cheapest month to fly to Boston?

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

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

Flying to Boston from Seattle at noon is the least expensive time of day to depart. momondo users have found prices as low as C$ 358 when looking at flights departing at noon. Flights in the morning are often more expensive with an average ticket price of C$ 833.

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?

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

There is only 1 cabin class 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 October 2025, prices for Seattle to Boston flights are approximately 16% cheaper when compared to flights at the same time last year.

What is the cheapest airline that flies from Seattle/Tacoma Intl to Boston Logan Intl?

Alaska Airlines, United Airlines, and Delta are the most popular carriers operating from Seattle/Tacoma Intl to Boston Logan Intl

Which airlines fly to Boston?

How often are flights from Seattle to Boston delayed?

Historically, on average around 16% of flights between Seattle and Boston have experienced a delay on any given week. The average delay length over the past 12 months has been 148 minutes.

What is the most punctual flight time for Seattle to Boston flights?

Generally, flights departing at night tend to experience fewer delays. Flights departing in the early afternoon have, in the past, seen delays more frequently in comparison.

What day of the week experiences the fewest flight delays on this route?

Tuesday is statistically the day of the week that experiences the fewest delays on this flight route. Thursday has historically seen more delays on average compared to the rest of the week.

Which airline has the best punctuality record on Seattle to Boston flights?

According to our data, KLM has had the lowest number of delays on this route over the last 12 months, with no flights being classified as delayed.

How many flights depart from Seattle to Boston on average per day?

As of October 2025, there are 7 flights per day flying from Seattle to Boston. The most common time of day flights depart is 3:00p.m., with 41% of flights taking off at noon.

How many flights depart from Seattle to Boston on average per week?

The number of flights available between Seattle and Boston is 49 per week as of October 2025. The most frequent departure day is Thu, with 55% of weekly flights leaving on this day.

When to book flights from Seattle to Boston

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

Fastest flight time

Direct flights

Airports in Boston

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

When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to Boston Logan Intl Airport?

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?

What documentation or ID do you need to fly to Boston Logan Intl Airport?

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

Alaska Airlines Flights From Seattle to Boston

Delta Flights From Seattle to Boston

Travelling to a place near Boston?

Why use momondo?

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

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

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

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

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

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