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Cheap flights from Seattle to Boston from C$ 165

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 30/9. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BOS
11 Oct — 18 Oct1
1 adult
1 adult, Economy

Cheapflights Tip: The best prices from Seattle/Tacoma Intl to Boston Logan Intl are usually found in January or March, booked 52 days in advance, depart on a Monday or Wednesday and return on a Wednesday

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 11 September 2025.

Round-trip from

C$ 248

One-way from

C$ 165

Popular in

December

Cheapest in

January

Average price

C$ 467

Good round-trip deal

C$ 308 or less

Good one-way deal

C$ 517 or less
Southwest
  • Southwest
  • 28/10-29/10
  • 3 total stops
  • 20h 30m total
  • Seattle to Boston
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Hawaiian Airlines
  • Hawaiian Airlines
  • 30/9
  • Nonstop
  • 5h 28m total
  • Seattle to Boston
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High demand for flights, 6% potential price rise
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Cheapest flight prices on average. 3% potential price decrease (C$ 23 potential savings vs. average RT price).
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Average for round-trip flights in September 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

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 11 September 2025.

Tue 28/105:50 a.m.SEA - BOS
2 stops9h 10mSouthwest
Wed 29/106:45 a.m.BOS - SEA
1 stop11h 20mSouthwest
Deal found 11/9C$ 248
Wed 5/115:40 a.m.SEA - BOS
1 stop7h 25mSouthwest
Tue 11/115:30 a.m.BOS - SEA
1 stop10h 55mSouthwest
Deal found 9/9C$ 249
Sat 18/101:10 p.m.SEA - BOS
Nonstop5h 36mJetBlue
Fri 24/108:20 a.m.BOS - SEA
Nonstop6h 39mJetBlue
Deal found 11/9C$ 259
Thu 13/113:59 p.m.SEA - BOS
Nonstop5h 21mHawaiian Airlines
Mon 17/117:00 a.m.BOS - SEA
Nonstop6h 35mHawaiian Airlines
Deal found 10/9C$ 267
Sat 25/105:00 a.m.SEA - BOS
2 stops8h 55mSouthwest
Wed 29/106:45 a.m.BOS - SEA
1 stop11h 20mSouthwest
Deal found 10/9C$ 270
Wed 5/115:40 a.m.SEA - BOS
1 stop14h 05mSouthwest
Sat 8/115:20 a.m.BOS - SEA
1 stop8h 50mSouthwest
Deal found 11/9C$ 272
Mon 10/1111:10 p.m.SEA - BOS
Nonstop5h 19mHawaiian Airlines
Thu 13/119:00 a.m.BOS - SEA
Nonstop6h 35mHawaiian Airlines
Deal found 9/9C$ 273
Tue 28/105:50 a.m.SEA - BOS
2 stops9h 10mSouthwest
Thu 30/105:15 a.m.BOS - SEA
1 stop12h 45mSouthwest
Deal found 10/9C$ 279
Sat 18/101:10 p.m.SEA - BOS
Nonstop5h 36mJetBlue
Thu 23/108:20 a.m.BOS - SEA
Nonstop6h 39mJetBlue
Deal found 9/9C$ 280
Mon 6/1012:34 a.m.SEA - BOS
1 stop8h 37mAmerican Airlines
Tue 14/106:00 a.m.BOS - SEA
1 stop8h 03mAmerican Airlines
Deal found 9/9C$ 287

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 11 September 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

Sat 18/10

1:10 p.m.-9:46 p.m.

Nonstop5h 36m

Boston Logan Intl

Sat 25/10

8:20 a.m.-11:59 a.m.

Nonstop6h 39m

C$ 259

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Mon 10/11

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

Nonstop5h 19m

Boston Logan Intl

Thu 13/11

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

Nonstop6h 35m

C$ 273

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Thu 13/11

3:35 p.m.-11:51 p.m.

Nonstop5h 16m

Boston Logan Intl

Sun 16/11

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

Nonstop6h 30m

C$ 301

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Tue 28/10

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

Nonstop5h 21m

Boston Logan Intl

Fri 7/11

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

Nonstop6h 35m

C$ 301

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Tue 14/10

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

Nonstop5h 30m

Boston Logan Intl

Tue 21/10

7:20 a.m.-10:45 a.m.

Nonstop6h 25m

C$ 301

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Sun 5/10

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

Nonstop5h 30m

Boston Logan Intl

Mon 3/11

6:55 p.m.-10:22 p.m.

Nonstop6h 27m

C$ 301

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Thu 25/9

11:30 a.m.-8:23 p.m.

Nonstop5h 53m

Boston Logan Intl

Tue 30/9

7:00 a.m.-10:19 a.m.

Nonstop6h 19m

C$ 327

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Thu 2/10

7:00 a.m.-5:51 p.m.

1 stop7h 51m

Boston Logan Intl

Mon 6/10

12:10 p.m.-6:31 p.m.

1 stop9h 21m

C$ 328

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Fri 24/10

11:15 p.m.-7:53 a.m.

Nonstop5h 38m

Boston Logan Intl

Fri 31/10

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

Nonstop6h 35m

C$ 328

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Sun 26/10

3:35 p.m.-11:59 p.m.

Nonstop5h 24m

Boston Logan Intl

Wed 29/10

7:20 a.m.-10:45 a.m.

Nonstop6h 25m

C$ 328

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/9

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 29 August 2025.

Booking 52 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, May is the cheapest month in which you can book a flight from Seattle to Boston (average of C$ 292). Flying from Seattle to Boston in April is currently the most expensive (average of C$ 350). 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 11 September 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 61% 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 11 September 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
10,000 reviews
Check prices

Food

7.1

Boarding

8.1

Overall

8.0

Entertainment

7.0

Crew

8.5

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Food

7.1

Boarding

8.1

Overall

8.0

Entertainment

7.0

Crew

8.5

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Delta
8.0
Very good
7,960 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Food

7.1

Boarding

8.1

Overall

8.0

Entertainment

7.0

Crew

8.5

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
JetBlue
7.2
Good
2,913 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Food

7.1

Boarding

8.1

Overall

8.0

Entertainment

7.0

Crew

8.5

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.

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 29 flights from Seattle/Tacoma Intl to Logan Intl, all of which are around 5h 24m 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 16m. Fly via JetBlue, Hawaiian 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$ 137, 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: Air France (93%), EL AL (87%), Virgin Atlantic (83%).

  • What are the cheapest flights from Seattle to Boston?

    While on average a flight from Seattle to Boston is generally C$ 520, our data shows the cheapest flight currently is C$ 136. When looking at the most popular route, (Seattle/Tacoma Intl - Boston Logan Intl), you can expect to pay C$ 351 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, May is the cheapest month in which you can book a flight from Seattle to Boston (average of C$ 292). Flying from Seattle to Boston in April is currently the most expensive (average of C$ 350). 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
Braintree
Waltham
Somerville
Rockland
Chelsea
Warwick
Milford
Plymouth
Quincy
Revere
Hampton
Old Orchard Beach
Lynn
Merrimack
Kennebunk
Watertown
Lawrence
Sturbridge
Seekonk

Browse thousands of different options on Cheapflights for your next trip

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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 11 September 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapestC$ 137AverageC$ 328FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Alaska AirlinesCheapestC$ 168AverageC$ 563FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
JetBlueCheapestC$ 178AverageC$ 342FlexibilityNo 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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