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Cheap flights from Seattle to Boston from C$ 224

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 9/6. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BOS
13 Jan — 20 Jan1
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 80 days in advance, depart on a Monday or Thursday 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 14 December 2025.

Wed 31/128:00 a.m.SEA - BOS
1 stop7h 48mUnited Airlines
Thu 15/17:55 a.m.BOS - SEA
1 stop10h 49mUnited Airlines
Deal found 14/12C$ 522
Wed 31/128:00 a.m.SEA - BOS
1 stop7h 48mUnited Airlines
Mon 5/14:47 p.m.BOS - SEA
1 stop9h 25mUnited Airlines
Deal found 13/12C$ 523
Mon 29/123:59 p.m.SEA - BOS
Nonstop5h 24mAlaska Airlines
Thu 15/16:44 p.m.BOS - SEA
Nonstop6h 33mAlaska Airlines
Deal found 14/12C$ 533
Wed 24/1212:35 p.m.SEA - BOS
1 stop9h 18mUnited Airlines
Wed 21/110:56 a.m.BOS - SEA
1 stop10h 31mUnited Airlines
Deal found 12/12C$ 547
Mon 29/124:57 p.m.SEA - BOS
1 stop10h 45mDelta
Fri 16/16:45 p.m.BOS - SEA
Nonstop6h 28mDelta
Deal found 12/12C$ 582
Mon 29/124:57 p.m.SEA - BOS
1 stop10h 45mDelta
Wed 7/16:05 a.m.BOS - SEA
1 stop16h 33mDelta
Deal found 12/12C$ 593
Mon 29/123:59 p.m.SEA - BOS
Nonstop5h 24mAlaska Airlines
Wed 7/16:44 p.m.BOS - SEA
Nonstop6h 33mAlaska Airlines
Deal found 12/12C$ 596
Thu 18/125:02 a.m.SEA - BOS
1 stop7h 33mUnited Airlines
Mon 12/110:56 a.m.BOS - SEA
1 stop10h 31mUnited Airlines
Deal found 13/12C$ 615
Mon 29/125:00 a.m.SEA - BOS
1 stop10h 25mSouthwest
Thu 15/14:55 p.m.BOS - SEA
1 stop8h 55mSouthwest
Deal found 14/12C$ 622
Mon 29/123:59 p.m.SEA - BOS
Nonstop5h 24mAlaska Airlines
Mon 5/16:00 a.m.BOS - SEA
1 stop11h 55mAlaska Airlines
Deal found 14/12C$ 628

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 14 December 2025.

Round-trip from

C$ 408

One-way from

C$ 224

Popular in

December

Cheapest in

January

Average price

C$ 728

Good round-trip deal

C$ 457 or less
Delta
  • Delta
  • 13/1-18/1
  • 2 total stops
  • 20h 01m total
  • Seattle to Boston
Search Deals
Alaska Airlines
  • Alaska Airlines
  • 10/6
  • 1 total stop
  • 9h 36m total
  • Seattle to Boston
Search Deals
Highest demand for flights based on searches. 7% potential increase in price (C$ 55 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease (C$ 31 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
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 14 December 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

Wed 14/1

7:40 a.m.-4:09 p.m.

Nonstop5h 29m

Boston Logan Intl

Wed 21/1

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

Nonstop6h 30m

C$ 423

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Tue 21/4

3:35 p.m.-11:54 p.m.

Nonstop5h 19m

Boston Logan Intl

Wed 29/4

5:55 p.m.-9:19 p.m.

Nonstop6h 24m

C$ 423

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Sat 9/5

11:30 a.m.-8:05 p.m.

Nonstop5h 35m

Boston Logan Intl

Sun 17/5

7:00 a.m.-10:20 a.m.

Nonstop6h 20m

C$ 423

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Thu 12/3

3:42 p.m.-11:59 p.m.

Nonstop5h 17m

Boston Logan Intl

Wed 18/3

10:00 a.m.-1:23 p.m.

Nonstop6h 23m

C$ 423

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Sat 7/2

7:40 a.m.-4:09 p.m.

Nonstop5h 29m

Boston Logan Intl

Mon 9/2

6:45 p.m.-10:13 p.m.

Nonstop6h 28m

C$ 423

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Fri 8/5

11:30 a.m.-8:05 p.m.

Nonstop5h 35m

Boston Logan Intl

Sun 17/5

7:00 a.m.-10:20 a.m.

Nonstop6h 20m

C$ 423

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Wed 28/1

7:40 a.m.-4:09 p.m.

Nonstop5h 29m

Boston Logan Intl

Sun 1/2

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

Nonstop6h 30m

C$ 423

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Wed 7/1

3:40 p.m.-11:54 p.m.

Nonstop5h 14m

Boston Logan Intl

Thu 15/1

7:00 a.m.-10:34 a.m.

Nonstop6h 34m

C$ 423

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Thu 12/3

3:43 p.m.-11:58 p.m.

Nonstop5h 15m

Boston Logan Intl

Wed 18/3

6:42 p.m.-10:05 p.m.

Nonstop6h 23m

C$ 423

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Thu 26/3

10:25 p.m.-6:50 a.m.

Nonstop5h 25m

Boston Logan Intl

Fri 27/3

6:42 p.m.-10:05 p.m.

Nonstop6h 23m

C$ 423

Flights are sorted by cheapest round-trip flights first.

Deals found on 13/12

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 12 December 2025.

Booking 80 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$ 135). Flying from Seattle to Boston in December is currently the most expensive (average of C$ 310). 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 14 December 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 52% 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 14 December 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
11,448 reviews
Check prices

Entertainment

7.0

Comfort

7.8

Food

7.1

Overall

8.0

Boarding

8.1

Crew

8.5

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
11,448 reviews
Alaska Airlines
8.0
Very good
11,448 reviews
Check prices

Entertainment

7.0

Comfort

7.8

Food

7.1

Overall

8.0

Boarding

8.1

Crew

8.5

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
8,008 reviews
Alaska Airlines
8.0
Very good
11,448 reviews
Check prices

Entertainment

7.0

Comfort

7.8

Food

7.1

Overall

8.0

Boarding

8.1

Crew

8.5

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
2,895 reviews
Alaska Airlines
8.0
Very good
11,448 reviews
Check prices

Entertainment

7.0

Comfort

7.8

Food

7.1

Overall

8.0

Boarding

8.1

Crew

8.5

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 18 flights from Seattle/Tacoma Intl to Logan Intl, all of which are around 5h 15m 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 34 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 19m. Fly via Delta or Alaska Airlines 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$ 136, 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 72% 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: TAP AIR PORTUGAL (100%), EL AL (91%), Condor (88%).

  • What are the cheapest flights from Seattle to Boston?

    While on average a flight from Seattle to Boston is generally C$ 541, our data shows the cheapest flight currently is C$ 422. When looking at the most popular route, (Seattle/Tacoma Intl - Boston Logan Intl), you can expect to pay C$ 445 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$ 135). Flying from Seattle to Boston in December is currently the most expensive (average of C$ 310). 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
Lawrence
Seekonk
Nashua

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 14 December 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapestC$ 136AverageC$ 326FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
JetBlueCheapestC$ 177AverageC$ 338FlexibilityNo cancel feeOn-time62%
Search JetBlue flights
Alaska AirlinesCheapestC$ 326AverageC$ 532FlexibilityNo 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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