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Cheap flights from Seattle to Boston from C$ 209

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 29/3. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BOS
28 Feb — 7 Mar1
1 adult
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from Seattle/Tacoma Intl to Boston Logan Intl are usually found in March or February, booked 70 days in advance, depart on a Monday or Wednesday 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 29 January 2026.

Wed 4/37:30 a.m.
SEA
-
BOS
Nonstop5h 29m
Delta
Tue 10/37:44 p.m.
BOS
-
SEA
1 stop15h 59m
Delta
Deal found 28/1C$ 395
Wed 14/104:59 p.m.
SEA
-
BOS
1 stop11h 32m
Alaska Airlines
Wed 21/106:00 a.m.
BOS
-
SEA
1 stop9h 52m
Alaska Airlines
Deal found 28/1C$ 396
Wed 11/312:07 a.m.
SEA
-
BOS
1 stop7h 39m
American Airlines
Wed 18/35:31 p.m.
BOS
-
SEA
1 stop9h 53m
American Airlines
Deal found 28/1C$ 398
Wed 20/511:50 a.m.
SEA
-
BOS
Nonstop5h 40m
Delta
Wed 27/511:00 a.m.
BOS
-
SEA
Nonstop6h 23m
Delta
Deal found 29/1C$ 403
Wed 10/63:33 p.m.
SEA
-
BOS
Nonstop5h 26m
Alaska Airlines
Mon 15/67:00 p.m.
BOS
-
SEA
Nonstop6h 29m
Alaska Airlines
Deal found 27/1C$ 405
Wed 18/311:30 a.m.
SEA
-
BOS
1 stop15h 23m
Alaska Airlines
Wed 1/49:00 a.m.
BOS
-
SEA
Nonstop6h 25m
Alaska Airlines
Deal found 29/1C$ 407
Mon 16/210:40 p.m.
SEA
-
BOS
Nonstop5h 14m
Alaska Airlines
Wed 25/24:36 p.m.
BOS
-
SEA
1 stop8h 42m
Alaska Airlines
Deal found 26/1C$ 410
Wed 20/57:05 p.m.
SEA
-
BOS
1 stop7h 59m
United Airlines
Wed 27/55:45 a.m.
BOS
-
SEA
1 stop8h 55m
United Airlines
Deal found 28/1C$ 411
Mon 9/37:00 a.m.
SEA
-
BOS
1 stop7h 17m
United Airlines
Tue 10/32:15 p.m.
BOS
-
SEA
2 stops11h 30m
United Airlines
Deal found 28/1C$ 413
Thu 5/37:30 a.m.
SEA
-
BOS
Nonstop5h 29m
Delta
Sun 8/37:10 a.m.
BOS
-
SEA
Nonstop6h 25m
Delta
Deal found 28/1C$ 417
Sat 14/33:55 p.m.
SEA
-
BOS
1 stop14h 05m
Delta
Sat 21/39:40 a.m.
BOS
-
SEA
Nonstop6h 20m
Delta
Deal found 29/1C$ 421

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 29 January 2026.

Round-trip from

C$ 395

One-way from

C$ 209

Popular in

December

Cheapest in

March

Average price

C$ 447

Good round-trip deal

C$ 621 or less
Delta
  • Delta
  • 4/3-10/3
  • 1 total stop
  • 21h 28m total
  • Seattle to Boston
Search Deals
Delta
  • Delta
  • 1/3
  • Nonstop
  • 5h 29m total
  • Seattle to Boston
Search Deals
Highest demand for flights based on searches. 12% potential increase in price (C$ 92 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease (C$ 30 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 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 29 January 2026.
Use the filters below to find and compare flights from Seattle to Boston that are best for you.

Fly from

Seattle

Fly to

Boston

Route

Depart

Return

Price

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Wed 20/5

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

Nonstop5h 28m

Boston Logan Intl

Wed 27/5

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

Nonstop6h 30m

C$ 403

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Mon 16/2

10:40 p.m.-6:54 a.m.

Nonstop5h 14m

Boston Logan Intl

Wed 25/2

4:36 p.m.-10:18 p.m.

1 stop8h 42m

C$ 410

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Thu 9/4

8:30 a.m.-5:53 a.m.

1 stop18h 23m

Boston Logan Intl

Tue 14/4

7:15 a.m.-10:40 a.m.

Nonstop6h 25m

C$ 430

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Wed 6/5

6:00 a.m.-6:35 p.m.

1 stop9h 35m

Boston Logan Intl

Mon 11/5

6:55 p.m.-12:05 a.m.

1 stop8h 10m

C$ 444

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Thu 26/2

7:10 p.m.-5:52 a.m.

1 stop7h 42m

Boston Logan Intl

Mon 2/3

4:25 p.m.-10:43 p.m.

1 stop9h 18m

C$ 444

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Tue 5/5

10:35 p.m.-6:55 a.m.

Nonstop5h 20m

Boston Logan Intl

Sat 30/5

11:00 a.m.-2:40 p.m.

Nonstop6h 40m

C$ 444

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Fri 1/5

3:40 p.m.-11:59 p.m.

Nonstop5h 19m

Boston Logan Intl

Sat 9/5

7:05 a.m.-10:32 a.m.

Nonstop6h 27m

C$ 451

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Thu 7/5

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

Nonstop5h 28m

Boston Logan Intl

Sun 10/5

3:30 p.m.-7:00 p.m.

Nonstop6h 30m

C$ 451

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Fri 13/3

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

Nonstop5h 14m

Boston Logan Intl

Thu 19/3

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

Nonstop6h 25m

C$ 451

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Sun 17/5

11:59 p.m.-2:16 p.m.

1 stop11h 17m

Boston Logan Intl

Wed 20/5

2:55 p.m.-8:53 p.m.

1 stop8h 58m

C$ 458

Flights are sorted by cheapest round-trip flights first.

Deals found on 27/1

Showing 1-10 of 21 results
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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 23 January 2026.

Booking 27 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, March is the cheapest month in which you can book a flight from Seattle to Boston (average of C$ 147). Flying from Seattle to Boston in December is currently the most expensive (average of C$ 331). 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 29 January 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 64% 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 29 January 2026.
Get a feel of what it's like to fly with Alaska Airlines,Delta, andJetBlue 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
8.0
Very good
11,808 reviews
Check prices

Boarding

8.1

Food

7.1

Overall

8.0

Crew

8.5

Entertainment

7.0

Comfort

7.8

Reviews

1 / 20
4.0
Okay

Anonymous,Dec 2025

SEA - MSY

I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.
Alaska Airlines
8.0
Very good
11,808 reviews
Alaska Airlines
8.0
Very good
11,808 reviews
Check prices

Boarding

8.1

Food

7.1

Overall

8.0

Crew

8.5

Entertainment

7.0

Comfort

7.8

Reviews

1 / 20
4.0
Okay

Anonymous,Dec 2025

SEA - MSY

I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.
Delta
7.9
Good
8,127 reviews
Alaska Airlines
8.0
Very good
11,808 reviews
Check prices

Boarding

8.1

Food

7.1

Overall

8.0

Crew

8.5

Entertainment

7.0

Comfort

7.8

Reviews

1 / 20
4.0
Okay

Anonymous,Dec 2025

SEA - MSY

I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.
JetBlue
7.2
Good
2,891 reviews
Alaska Airlines
8.0
Very good
11,808 reviews
Check prices

Boarding

8.1

Food

7.1

Overall

8.0

Crew

8.5

Entertainment

7.0

Comfort

7.8

Reviews

1 / 20
4.0
Okay

Anonymous,Dec 2025

SEA - MSY

I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.

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 12 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 3 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 31 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 14m. Fly via Southwest, Alaska Airlines, or Delta 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.Alternate airlines to your destination round-trip include JetBlue and Alaska Airlines. You may be able to fly from Seattle to Boston for 73% 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 (100%), EL AL (96%), Japan Airlines (95%).

  • What are the cheapest flights from Seattle to Boston?

    While on average a flight from Seattle to Boston is generally C$ 1,139, our data shows the cheapest flight currently is C$ 619. When looking at the most popular route, (Seattle/Tacoma Intl - Boston Logan Intl), you can expect to pay C$ 369 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, March is the cheapest month in which you can book a flight from Seattle to Boston (average of C$ 147). Flying from Seattle to Boston in December is currently the most expensive (average of C$ 331). 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
Seekonk
Nashua

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Top 3 airlines flying from Seattle to Boston

Discover the top 3 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 29 January 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapestC$ 134AverageC$ 215FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
JetBlueCheapestC$ 160AverageC$ 334FlexibilityNo cancel feeOn-time62%
Search JetBlue flights
Alaska AirlinesCheapestC$ 308AverageC$ 552FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines 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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