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Cheap flights from Seattle to Boston from C$ 162

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 30/3. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BOS
11 Apr — 18 Apr1
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 70 days in advance, depart on a Wednesday or Monday and return on a Monday

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 12 March 2026.

Tue 21/46:00 a.m.
SEA
-
BOS
1 stop9h 35m
Southwest
Tue 28/44:45 p.m.
BOS
-
SEA
1 stop8h 45m
Southwest
Deal found 10/3C$ 307
Sun 19/45:15 a.m.
SEA
-
BOS
1 stop13h 50m
Southwest
Tue 28/46:20 p.m.
BOS
-
SEA
1 stop8h 50m
Southwest
Deal found 11/3C$ 314
Fri 1/51:07 p.m.
SEA
-
BOS
1 stop7h 52m
United Airlines
Mon 4/56:39 p.m.
BOS
-
SEA
1 stop8h 20m
United Airlines
Deal found 8/3C$ 315
Thu 7/55:15 a.m.
SEA
-
BOS
1 stop8h 55m
Southwest
Tue 12/56:20 p.m.
BOS
-
SEA
1 stop8h 50m
Southwest
Deal found 10/3C$ 316
Mon 20/46:15 p.m.
SEA
-
BOS
2 stops11h 00m
Southwest
Sat 25/43:15 p.m.
BOS
-
SEA
2 stops9h 55m
Southwest
Deal found 11/3C$ 320
Mon 30/311:55 p.m.
SEA
-
BOS
1 stop8h 25m
Southwest
Tue 7/46:20 p.m.
BOS
-
SEA
1 stop8h 50m
Southwest
Deal found 9/3C$ 322
Fri 1/51:55 p.m.
SEA
-
BOS
1 stop7h 55m
Southwest
Mon 4/54:45 p.m.
BOS
-
SEA
2 stops10h 20m
Southwest
Deal found 7/3C$ 329
Fri 1/56:15 p.m.
SEA
-
BOS
2 stops10h 50m
Southwest
Tue 5/52:25 p.m.
BOS
-
SEA
2 stops11h 05m
Southwest
Deal found 7/3C$ 335
Mon 13/46:15 p.m.
SEA
-
BOS
2 stops11h 00m
Southwest
Wed 15/42:25 p.m.
BOS
-
SEA
1 stop12h 45m
Southwest
Deal found 8/3C$ 337

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 12 March 2026.

Round-trip from

C$ 307

One-way from

C$ 162

Popular in

December

Cheapest in

September

Average price

C$ 470

Good round-trip deal

C$ 267 or less
Southwest
  • Southwest
  • 21/4-28/4
  • 2 total stops
  • 18h 20m total
  • Seattle to Boston
Search Deals
United Airlines
  • United Airlines
  • 30/3
  • 1 total stop
  • 9h 47m total
  • Seattle to Boston
Search Deals
Highest demand for flights based on searches. 13% potential increase in price (C$ 113 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease (C$ 28 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 2026
Search Deals
Price to beat on a round-trip 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 12 March 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

Tue 5/5

3:21 p.m.-11:59 p.m.

Nonstop5h 38m

Boston Logan Intl

Wed 6/5

5:56 p.m.-9:26 a.m.

1 stop18h 30m

C$ 449

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Mon 13/4

11:59 p.m.-12:46 p.m.

1 stop9h 47m

Boston Logan Intl

Wed 15/4

11:00 a.m.-7:00 p.m.

1 stop11h 00m

C$ 458

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Mon 30/3

11:55 p.m.-11:20 a.m.

1 stop8h 25m

Boston Logan Intl

Sun 5/4

5:00 a.m.-10:35 a.m.

1 stop8h 35m

C$ 458

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Tue 26/5

11:00 p.m.-7:35 a.m.

Nonstop5h 35m

Boston Logan Intl

Wed 3/6

7:30 p.m.-10:40 p.m.

Nonstop6h 10m

C$ 458

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Mon 25/5

8:45 a.m.-6:20 a.m.

1 stop18h 35m

Boston Logan Intl

Mon 1/6

6:40 p.m.-10:25 a.m.

1 stop18h 45m

C$ 498
Quickest round-trip

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Thu 2/4

3:45 p.m.-11:59 p.m.

Nonstop5h 14m

Boston Logan Intl

Mon 6/4

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

Nonstop6h 25m

C$ 505

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Mon 20/7

3:55 p.m.-12:23 a.m.

Nonstop5h 28m

Boston Logan Intl

Mon 10/8

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

Nonstop6h 30m

C$ 505

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Mon 30/3

3:45 p.m.-11:59 p.m.

Nonstop5h 14m

Boston Logan Intl

Sun 5/4

6:15 a.m.-12:27 p.m.

1 stop9h 12m

C$ 512

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Wed 13/5

4:10 p.m.-12:42 a.m.

Nonstop5h 32m

Boston Logan Intl

Tue 19/5

3:55 p.m.-7:05 p.m.

Nonstop6h 10m

C$ 534

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Thu 2/4

3:45 p.m.-11:59 p.m.

Nonstop5h 14m

Boston Logan Intl

Fri 12/6

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

Nonstop6h 30m

C$ 539

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/3

Showing 1-10 of 23 resultsSorted by cheapest first
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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?

Use this chart to determine the optimal time to book a round-trip flight from Seattle to Boston. Price data was last updated on 6 March 2026.

Booking 70 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, October is the cheapest month in which you can book a flight from Seattle to Boston (average of C$ 160). Flying from Seattle to Boston in January is currently the most expensive (average of C$ 349). 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 12 March 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 69% on your trip compared to booking a flight in the morning.

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 12 March 2026.
Get a feel of what it's like to fly with Delta 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.
Delta
7.9
Good
8,286 reviews
Check prices

Overall

7.9

Entertainment

7.8

Crew

8.5

Food

7.2

Comfort

7.9

Boarding

8.1

Reviews

1 / 20
6.0
Good

Colin,Sep 2024

LHR - BOS

Delta One is very poor quality seating for first class. On multiple trips pieces have come off the seat. Staff and food have been good
Delta
7.9
Good
8,286 reviews
Delta
7.9
Good
8,286 reviews
Check prices

Overall

7.9

Entertainment

7.8

Crew

8.5

Food

7.2

Comfort

7.9

Boarding

8.1

Reviews

1 / 20
6.0
Good

Colin,Sep 2024

LHR - BOS

Delta One is very poor quality seating for first class. On multiple trips pieces have come off the seat. Staff and food have been good
JetBlue
7.2
Good
2,903 reviews
Delta
7.9
Good
8,286 reviews
Check prices

Overall

7.9

Entertainment

7.8

Crew

8.5

Food

7.2

Comfort

7.9

Boarding

8.1

Reviews

1 / 20
6.0
Good

Colin,Sep 2024

LHR - BOS

Delta One is very poor quality seating for first class. On multiple trips pieces have come off the seat. Staff and food have been good

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 17 flights from Seattle/Tacoma Intl to Logan Intl, all of which are around 5h 14m 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 27 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 38m. Fly via Alaska Airlines, United Airlines, or Southwest 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?

    Delta, at C$ 134, 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 74% 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: KLM (90%), EL AL (89%), Scandinavian Airlines (82%).

  • What are the cheapest flights from Seattle to Boston?

    While on average a flight from Seattle to Boston is generally C$ 322, our data shows the cheapest flight currently is C$ 207. When looking at the most popular route, (Seattle/Tacoma Intl - Boston Logan Intl), you can expect to pay C$ 478 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, October is the cheapest month in which you can book a flight from Seattle to Boston (average of C$ 160). Flying from Seattle to Boston in January is currently the most expensive (average of C$ 349). 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
Medford
Merrimack
Chelsea
Milford
Braintree
Hampton
Old Orchard Beach
Revere
Waltham
Kennebunk
Watertown
Warwick
Lawrence
Pawtucket
Seekonk
Nashua

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 12 March 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapestC$ 134AverageC$ 257FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
JetBlueCheapestC$ 174AverageC$ 334FlexibilityNo 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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