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Cheap flights from Seattle to Boston from C$ 166

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 18/11. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BOS
28 Nov — 5 Dec1
1 adult
1 adult, Economy, 0 bags

Cheapflights Tip: The best prices from Seattle/Tacoma Intl to Boston Logan Intl are usually found in January or March, booked 27 days in advance, depart on a Monday or Wednesday and return on a Monday

Cheap 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 October 2025.

Round-trip from

C$ 303

One-way from

C$ 166

Popular in

December

Cheapest in

January

Average price

C$ 469

Good round-trip deal

C$ 680 or less

Good one-way deal

C$ 319 or less
United Airlines
  • United Airlines
  • 10/11-13/11
  • 2 total stops
  • 17h 40m total
  • Seattle to Boston
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Alaska Airlines
  • Alaska Airlines
  • 8/12
  • Nonstop
  • 5h 19m total
  • Seattle to Boston
Search Deals
High demand for flights, 3% potential price rise
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Cheapest flight prices on average. 3% potential price decrease (C$ 25 potential savings vs. average RT price).
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Average for round-trip flights in October 2025
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Price to beat on a round-trip flight from Seattle/Tacoma Intl to Boston Logan Intl.
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Price to beat on a one-way flight from Seattle/Tacoma Intl to Boston Logan Intl.
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Find 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 October 2025.

Mon 10/117:00 a.m.SEA - BOS
1 stop7h 15mUnited Airlines
Thu 13/1111:00 a.m.BOS - SEA
1 stop10h 25mUnited Airlines
Deal found 27/10C$ 303
Sat 8/1111:30 p.m.SEA - BOS
1 stop7h 00mUnited Airlines
Tue 11/118:00 a.m.BOS - SEA
1 stop11h 15mUnited Airlines
Deal found 27/10C$ 309
Tue 11/113:59 p.m.SEA - BOS
Nonstop5h 21mAlaska Airlines
Thu 13/117:00 a.m.BOS - SEA
Nonstop6h 35mAlaska Airlines
Deal found 28/10C$ 331
Fri 14/117:13 p.m.SEA - BOS
1 stop7h 43mUnited Airlines
Tue 18/1111:00 a.m.BOS - SEA
1 stop10h 25mUnited Airlines
Deal found 29/10C$ 337
Thu 11/123:38 p.m.SEA - BOS
Nonstop5h 21mAlaska Airlines
Sun 18/17:00 a.m.BOS - SEA
Nonstop6h 34mAlaska Airlines
Deal found 28/10C$ 338
Sat 15/115:20 a.m.SEA - BOS
1 stop7h 04mAlaska Airlines
Wed 19/116:23 p.m.BOS - SEA
Nonstop6h 28mAlaska Airlines
Deal found 28/10C$ 345
Tue 4/117:00 a.m.SEA - BOS
1 stop7h 13mUnited Airlines
Wed 5/118:00 a.m.BOS - SEA
1 stop11h 15mUnited Airlines
Deal found 26/10C$ 349
Wed 12/117:13 p.m.SEA - BOS
1 stop7h 43mUnited Airlines
Sun 16/116:00 a.m.BOS - SEA
1 stop10h 38mUnited Airlines
Deal found 27/10C$ 351
Thu 13/113:59 p.m.SEA - BOS
Nonstop5h 21mAlaska Airlines
Wed 19/114:46 p.m.BOS - SEA
1 stop9h 46mAlaska Airlines
Deal found 28/10C$ 355
Wed 3/127:21 p.m.SEA - BOS
1 stop17h 16mAlaska Airlines
Mon 8/126:52 p.m.BOS - SEA
1 stop18h 00mAlaska Airlines
Deal found 29/10C$ 358
Sun 23/113:39 p.m.SEA - BOS
Nonstop5h 15mDelta
Wed 3/127:15 a.m.BOS - SEA
Nonstop6h 30mDelta
Deal found 27/10C$ 359

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 October 2025.
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

Tue 18/11

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

Nonstop5h 21m

Boston Logan Intl

Thu 4/12

6:59 p.m.-10:30 p.m.

Nonstop6h 31m

C$ 331

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Thu 13/11

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

Nonstop5h 21m

Boston Logan Intl

Thu 20/11

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

Nonstop6h 35m

C$ 331

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Wed 10/12

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

Nonstop5h 30m

Boston Logan Intl

Sat 13/12

6:55 p.m.-10:14 p.m.

Nonstop6h 19m

C$ 359

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Wed 10/12

7:35 a.m.-4:03 p.m.

Nonstop5h 28m

Boston Logan Intl

Sun 14/12

6:55 p.m.-10:14 p.m.

Nonstop6h 19m

C$ 359

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Fri 6/2

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

Nonstop5h 19m

Boston Logan Intl

Sun 8/2

4:20 p.m.-11:57 p.m.

1 stop10h 37m

C$ 359

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Wed 7/1

7:55 a.m.-4:20 p.m.

Nonstop5h 25m

Boston Logan Intl

Mon 12/1

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

1 stop8h 13m

C$ 359

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Wed 3/12

11:10 p.m.-7:29 a.m.

Nonstop5h 19m

Boston Logan Intl

Wed 10/12

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

Nonstop6h 35m

C$ 373

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Thu 4/12

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

Nonstop5h 21m

Boston Logan Intl

Fri 12/12

6:52 p.m.-9:43 p.m.

1 stop29h 51m

C$ 377

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Thu 4/12

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

Nonstop5h 21m

Boston Logan Intl

Sun 7/12

9:00 a.m.-12:35 p.m.

Nonstop6h 35m

C$ 380

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Wed 7/1

6:05 a.m.-8:50 p.m.

2 stops11h 45m

Boston Logan Intl

Mon 12/1

2:40 p.m.-10:30 p.m.

2 stops10h 50m

C$ 387

Flights are sorted by cheapest round-trip flights first.

Deals found on 27/10

Showing 1-10 of 22 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 24 October 2025.

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, January is the cheapest month in which you can book a flight from Seattle to Boston (average of C$ 137). Flying from Seattle to Boston in August is currently the most expensive (average of C$ 249). 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 October 2025.

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 57% 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 October 2025.
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
11,213 reviews
Check prices

Overall

8.0

Boarding

8.1

Comfort

7.8

Crew

8.5

Food

7.1

Entertainment

7.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
Alaska Airlines
8.0
Very good
11,213 reviews
Alaska Airlines
8.0
Very good
11,213 reviews
Check prices

Overall

8.0

Boarding

8.1

Comfort

7.8

Crew

8.5

Food

7.1

Entertainment

7.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
Delta
7.9
Good
7,992 reviews
Alaska Airlines
8.0
Very good
11,213 reviews
Check prices

Overall

8.0

Boarding

8.1

Comfort

7.8

Crew

8.5

Food

7.1

Entertainment

7.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
JetBlue
7.2
Good
2,906 reviews
Alaska Airlines
8.0
Very good
11,213 reviews
Check prices

Overall

8.0

Boarding

8.1

Comfort

7.8

Crew

8.5

Food

7.1

Entertainment

7.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.

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 11 flights from Seattle/Tacoma Intl to Logan Intl, all of which are around 5h 30m 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 47 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 21m. Fly via Alaska Airlines or Delta to get the fastest option. The distance from Seattle to Boston is about 4002 km. All flights are typically direct.

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

    Delta, at C$ 138, was found to be the cheapest airline from Seattle to Boston.Alternate airlines to your destination round-trip include Alaska Airlines and JetBlue. You may be able to fly from Seattle to Boston for 71% 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: Condor (85%), LATAM Airlines (78%), Air France (77%).

  • What are the cheapest flights from Seattle to Boston?

    While on average a flight from Seattle to Boston is generally C$ 704, our data shows the cheapest flight currently is C$ 242. When looking at the most popular route, (Seattle/Tacoma Intl - Boston Logan Intl), you can expect to pay C$ 708 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, January is the cheapest month in which you can book a flight from Seattle to Boston (average of C$ 137). Flying from Seattle to Boston in August is currently the most expensive (average of C$ 249). 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
Chelsea
Waltham
Warwick
Milford
Braintree
Plymouth
Hampton
Old Orchard Beach
Revere
Merrimack
Kennebunk
Watertown
Sturbridge
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 October 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapestC$ 138AverageC$ 331FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Alaska AirlinesCheapestC$ 169AverageC$ 531FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
JetBlueCheapestC$ 179AverageC$ 343FlexibilityNo 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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