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Cheap flights from Seattle to Boston from C$ 255

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 24/8. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BOS
25 Aug — 1 Sep1
1 adult
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from Seattle/Tacoma Intl to Boston Logan Intl are usually found in September or October, booked 85 days in advance, depart on a Sunday or Monday and return on a Thursday

Cheap flight deals from Seattle to Boston

Enter your travel dates to find the best prices.

Cheapest flights from Seattle to Boston
Explore the most affordable flight options available from Seattle to Boston. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 26 July 2026.

Wed 16/911:42 p.m.
SEA
-
BOS
Nonstop5h 24m
JetBlue
Sat 26/911:20 a.m.
BOS
-
SEA
1 stop12h 24m
JetBlue
Deal found 23/7C$ 444
Sat 5/911:40 p.m.
SEA
-
BOS
Nonstop5h 19m
JetBlue
Sat 12/911:20 a.m.
BOS
-
SEA
1 stop12h 24m
JetBlue
Deal found 22/7C$ 445
Sat 10/1011:13 p.m.
SEA
-
BOS
1 stop8h 48m
United Airlines
Sat 17/105:01 p.m.
BOS
-
SEA
1 stop8h 55m
United Airlines
Deal found 23/7C$ 448
Sun 20/911:42 p.m.
SEA
-
BOS
Nonstop5h 24m
JetBlue
Sat 26/911:20 a.m.
BOS
-
SEA
1 stop12h 24m
JetBlue
Deal found 23/7C$ 451
Wed 30/93:29 p.m.
SEA
-
BOS
Nonstop5h 25m
Alaska Airlines
Tue 6/106:40 p.m.
BOS
-
SEA
Nonstop6h 19m
Alaska Airlines
Deal found 21/7C$ 452
Thu 3/910:58 p.m.
SEA
-
BOS
1 stop7h 50m
United Airlines
Wed 9/99:30 a.m.
BOS
-
SEA
1 stop9h 13m
United Airlines
Deal found 24/7C$ 454
Wed 16/911:00 p.m.
SEA
-
BOS
1 stop7h 33m
United Airlines
Sun 20/96:00 a.m.
BOS
-
SEA
1 stop9h 20m
United Airlines
Deal found 22/7C$ 457
Wed 26/811:40 a.m.
SEA
-
BOS
Nonstop5h 29m
JetBlue
Sat 5/912:40 p.m.
BOS
-
SEA
1 stop11h 28m
JetBlue
Deal found 25/7C$ 458
Sat 10/1010:15 p.m.
SEA
-
BOS
1 stop9h 31m
JetBlue
Sun 11/101:00 p.m.
BOS
-
SEA
1 stop11h 15m
JetBlue
Deal found 25/7C$ 459
Tue 8/911:44 p.m.
SEA
-
BOS
Nonstop5h 16m
JetBlue
Wed 16/96:59 p.m.
BOS
-
SEA
Nonstop6h 39m
JetBlue
Deal found 21/7C$ 461
Thu 24/911:42 p.m.
SEA
-
BOS
Nonstop5h 24m
JetBlue
Tue 6/101:00 p.m.
BOS
-
SEA
1 stop10h 43m
JetBlue
Deal found 24/7C$ 465
Thu 24/99:40 p.m.
SEA
-
BOS
1 stop10h 11m
JetBlue
Tue 29/911:20 a.m.
BOS
-
SEA
1 stop12h 24m
JetBlue
Deal found 24/7C$ 468

Find flight deals from Seattle to Boston

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to Boston (BOS). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 26 July 2026.

Round-trip from

C$ 444

One-way from

C$ 255

Popular in

December

Cheapest in

September

Average price

C$ 624

Good round-trip deal

C$ 559 or less

Good one-way deal

C$ 512 or less
JetBlue
  • JetBlue
  • 22/9-23/9
  • 1 total stop
  • 16h 28m total
  • Seattle to Boston
Search Deals
United Airlines
  • United Airlines
  • 27/12
  • 1 total stop
  • 7h 25m total
  • Seattle to Boston
Search Deals
Highest demand for flights based on searches. 6% potential increase in price (C$ 58 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (C$ 23 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 2026
Search Deals
Price to beat on a round-trip flight from Seattle/Tacoma Intl to Boston Logan Intl.
Search Deals
Price to beat on a one-way flight from Seattle/Tacoma Intl to Boston Logan Intl.
Search Deals

Cheapflights 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, Cheapflights users made 629,999 searches. Data last updated 26 July 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

Cheapest round-trip

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Mon 21/9

11:00 p.m.-9:33 a.m.

1 stop7h 33m

Boston Logan Intl

Fri 25/9

9:23 a.m.-4:06 p.m.

1 stop9h 43m

C$ 480

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Wed 30/9

6:40 a.m.-9:25 p.m.

2 stops11h 45m

Boston Logan Intl

Tue 6/10

5:15 a.m.-10:50 a.m.

1 stop8h 35m

C$ 482

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Sat 12/9

11:08 p.m.-7:40 a.m.

Nonstop5h 32m

Boston Logan Intl

Sat 19/9

6:45 p.m.-10:03 p.m.

Nonstop6h 18m

C$ 489

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Fri 16/10

10:15 p.m.-10:46 a.m.

1 stop9h 31m

Boston Logan Intl

Mon 19/10

6:59 p.m.-10:38 p.m.

Nonstop6h 39m

C$ 506

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Sat 5/9

9:20 a.m.-12:25 a.m.

1 stop12h 05m

Boston Logan Intl

Mon 7/9

5:00 a.m.-10:45 a.m.

1 stop8h 45m

C$ 524

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Mon 24/8

9:10 a.m.-12:25 a.m.

1 stop12h 15m

Boston Logan Intl

Wed 26/8

4:45 p.m.-11:05 p.m.

1 stop9h 20m

C$ 533

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Thu 29/10

5:50 a.m.-6:50 p.m.

2 stops10h 00m

Boston Logan Intl

Sun 1/11

8:15 a.m.-9:10 p.m.

1 stop15h 55m

C$ 533

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Sat 22/8

9:20 a.m.-12:25 a.m.

1 stop12h 05m

Boston Logan Intl

Sat 29/8

3:55 p.m.-9:30 p.m.

1 stop8h 35m

C$ 566

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Wed 9/9

11:04 p.m.-10:18 a.m.

1 stop8h 14m

Boston Logan Intl

Tue 15/9

7:20 a.m.-9:31 p.m.

2 stops17h 11m

C$ 569
Quickest round-trip

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Wed 18/11

3:34 p.m.-11:59 p.m.

Nonstop5h 25m

Boston Logan Intl

Fri 27/11

9:20 a.m.-12:40 p.m.

Nonstop6h 20m

C$ 574

Flights are sorted by cheapest round-trip flights first.

Deals found on 25/7

Showing 1-10 of 21 resultsSorted by cheapest first
1
2
3

Best time to book a flight from Seattle to Boston

Have a flexible travel schedule? Discover the best time to fly to Boston from Seattle with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Seattle to Boston

How far ahead should I book a flight from Seattle to Boston?

Booking 83 days in advance of your planned departure date is, on average, the best time to get cheap flights from Seattle to Boston. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

What is the cheapest month to book a flight from Seattle to Boston?

Currently, September is the cheapest month in which you can book a flight from Seattle to Boston (average of C$ 454). Flying from Seattle to Boston in December is currently the most expensive (average of C$ 755). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from SEA to BOS?

Find hourly flight availability from Seattle to Boston. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 26 July 2026.

A simple way to save on the total cost of your ticket is to fly from Seattle to Boston at noon. If you’re flexible enough to do this you can expect to save up to 60% on your trip compared to booking a flight in the morning.

How much does it cost to fly round-trip from Seattle to Boston?

Airfare is below average for this route at the moment.

Seattle to Boston flights typically cost between C$ 509 and C$ 767 in September.
The cheapest round-trip price found within the last 5 days was C$ 444 on JetBlue (16 Sep-23 Sep).

Reviews of airlines servicing Boston

Get insights into the airlines that provide service to Boston. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Boston. Reviews last updated 26 July 2026.
Get a feel of what it's like to fly with Alaska Airlines and JetBlue from Seattle to Boston by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
7.9
Good
12,716 reviews
Check prices

Entertainment

7.0

Food

7.0

Comfort

7.8

Crew

8.5

Boarding

8.1

Overall

7.9

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2026

SEA - RNO

There was a delay and my husband needs a wheelchair and we were moved from 1 gate to another.
Alaska Airlines
7.9
Good
12,716 reviews
Alaska Airlines
7.9
Good
12,716 reviews
Check prices

Entertainment

7.0

Food

7.0

Comfort

7.8

Crew

8.5

Boarding

8.1

Overall

7.9

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2026

SEA - RNO

There was a delay and my husband needs a wheelchair and we were moved from 1 gate to another.
JetBlue
7.1
Good
3,025 reviews
Alaska Airlines
7.9
Good
12,716 reviews
Check prices

Entertainment

7.0

Food

7.0

Comfort

7.8

Crew

8.5

Boarding

8.1

Overall

7.9

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2026

SEA - RNO

There was a delay and my husband needs a wheelchair and we were moved from 1 gate to another.

Related info for your journey

Find useful and relevant information for your journey from Seattle to Boston. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airports do I use to fly from Seattle to Boston?

    Booking a flight from Seattle/Tacoma Intl (SEA) to Boston Logan Intl (BOS) is your only option if you wish to fly from Seattle to Boston. On a typical day, there are 28 flights from Seattle/Tacoma Intl to Logan Intl, all of which are around 5h 25m for a nonstop flight. You can also purchase a plane ticket from 2 airlines when you book a flight from Seattle/Tacoma Intl to Boston.

  • How popular is this Seattle to Boston flight route?

    The Seattle/Tacoma Intl to Boston Logan Intl flight path was viewed by 25 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

  • How long is the flight from Seattle to Boston?

    There are many flights that can get you from Seattle to Boston in 5h 33m. Fly via Alaska Airlines, Southwest, or United Airlines to get the fastest option. The distance from Seattle to Boston is about 4002 km. This flight may include one or multiple stops.

  • What are the cheapest airlines flying from Seattle to Boston round-trip?

    Alaska Airlines, at C$ 215, was found to be the cheapest airline from Seattle to Boston. An alternate airline flying to your destination would be JetBlue. You may be able to fly from Seattle to Boston for 63% less than the average price by searching for these airlines.

  • What are the most reliable airlines from Seattle to Boston?

    Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Seattle to Boston on time: LATAM Airlines (96%), EL AL (94%), Condor (92%).

  • What are the cheapest flights from Seattle to Boston?

    While on average a flight from Seattle to Boston is generally C$ 549, our data shows the cheapest flight currently is C$ 512. When looking at the most popular route, (Seattle/Tacoma Intl - Boston Logan Intl), you can expect to pay C$ 400 for that flight.

  • Can I find deals for flights from Seattle to Boston that include hotel bookings?

    Yes. In addition to deals on Seattle to Boston flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Seattle to Boston?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Seattle to Boston.

  • Can I find deals for business class flights from Seattle to Boston?

    Yes. Cheapflights offers flight deals from Seattle to Boston by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Seattle to Boston?

    Currently, September is the cheapest month in which you can book a flight from Seattle to Boston (average of C$ 454). Flying from Seattle to Boston in December is currently the most expensive (average of C$ 755). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Travelling to a place near Boston?

Book flights to Boston if you plan to visit one of these locations
Old Orchard Beach
Hampton
Merrimack
Saugus
Braintree
Milford
Revere
Waltham
Watertown
Ogunquit
Warwick
Lawrence
Pawtucket
Seekonk
Foxborough
Nashua
Kittery

Browse thousands of different options on Cheapflights for your next trip

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Top 2 airlines flying from Seattle to Boston

Discover the top 2 airlines that operate flights from Seattle to Boston. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 629,999 searches. Data last updated 26 July 2026.
AirlineCheapestAverageFlexibilityOn-time
Alaska AirlinesCheapestC$ 215AverageC$ 686FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
JetBlueCheapestC$ 244AverageC$ 457FlexibilityNo cancel feeOn-time62%
Search JetBlue flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Seattle to Boston?

Cheapflights helps you search for flights from Seattle to Boston via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.

Why should you use Cheapflights to find cheap flight tickets from Seattle to Boston?

It’s simple! Cheapflights, which is free to use for everyone, saves millions of users time and money every year by helping them find the cheapest and most suitable flights from Seattle to Boston.

Can Cheapflights find flights from Seattle to Boston with no change fees?

Yes! Cheapflights helps users easily find flights from Seattle to Boston with no change fees.

Can Cheapflights notify me if prices for flights from Seattle to Boston become cheaper?

Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to Boston from Seattle today and book when prices fit your budget.

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