Find flights
Deals
When to book
Airlines
FAQs

Cheap flights from Seattle to Boston from C$ 172

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 7/5. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BOS
20 Apr — 27 Apr1
1 adult

Cheapflights Tip: The best prices from Seattle/Tacoma Intl to Boston Logan Intl are usually found in January or March, booked 87 days in advance, depart on a Wednesday or Tuesday 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 15 April 2025.

Round-trip from

C$ 343

One-way from

C$ 172

Popular in

July

Cheapest in

January

Average price

C$ 480

Good round-trip deal

C$ 192 or less
Alaska Airlines
  • Alaska Airlines
  • 30/4-4/5
  • Nonstop
  • 11h 36m total
  • Seattle to Boston
Search Deals
Delta
  • Delta
  • 7/5
  • Nonstop
  • 5h 22m total
  • Seattle to Boston
Search Deals
Highest demand for flights based on searches. 27% potential increase in price (C$ 270 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 April 2025
Search Deals
Price to beat on a round-trip flight from Seattle/Tacoma Intl to Boston Logan Intl.
Search Deals

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 15 April 2025.

Wed 30/43:36 p.m.SEA - BOS
Nonstop5h 23mAlaska Airlines
Sun 4/57:00 a.m.BOS - SEA
Nonstop6h 13mAlaska Airlines
Deal found 14/4C$ 343
Wed 21/511:38 a.m.SEA - BOS
Nonstop5h 32mJetBlue
Tue 27/57:10 a.m.BOS - SEA
Nonstop6h 18mJetBlue
Deal found 15/4C$ 363
Sat 3/58:50 a.m.SEA - BOS
2 stops10h 07mUnited Airlines
Tue 6/510:45 a.m.BOS - SEA
1 stop8h 37mUnited Airlines
Deal found 14/4C$ 372
Wed 7/56:00 a.m.SEA - BOS
2 stops23h 41mMultiple Airlines
Tue 13/57:47 p.m.BOS - SEA
1 stop15h 18mMultiple Airlines
Deal found 13/4C$ 402
Thu 24/47:35 a.m.SEA - BOS
Nonstop5h 32mDelta
Mon 28/47:25 a.m.BOS - SEA
Nonstop6h 20mDelta
Deal found 14/4C$ 462
Mon 5/55:05 a.m.SEA - BOS
2 stops9h 50mSouthwest
Wed 7/512:25 p.m.BOS - SEA
2 stops13h 35mSouthwest
Deal found 14/4C$ 466
Thu 24/711:40 p.m.SEA - BOS
Nonstop5h 20mHawaiian Airlines
Sun 3/87:20 a.m.BOS - SEA
Nonstop6h 18mHawaiian Airlines
Deal found 15/4C$ 559
Sun 4/51:10 a.m.SEA - BOS
1 stop9h 00mAmerican Airlines
Wed 7/57:00 a.m.BOS - SEA
Nonstop6h 13mAmerican Airlines
Deal found 14/4C$ 610

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 15 April 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 30/4

3:36 p.m.-11:59 p.m.

Nonstop5h 23m

Boston Logan Intl

Sun 4/5

7:00 a.m.-10:13 a.m.

Nonstop6h 13m

C$ 343

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Wed 21/5

11:38 a.m.-8:10 p.m.

Nonstop5h 32m

Boston Logan Intl

Tue 27/5

7:10 a.m.-10:28 a.m.

Nonstop6h 18m

C$ 363

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Mon 5/5

11:59 p.m.-10:38 a.m.

1 stop7h 39m

Boston Logan Intl

Wed 7/5

3:05 p.m.-10:42 p.m.

1 stop10h 37m

C$ 370

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Wed 7/5

6:00 a.m.-8:41 a.m.

2 stops23h 41m

Boston Logan Intl

Tue 13/5

7:47 p.m.-8:05 a.m.

1 stop15h 18m

C$ 402

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Mon 5/5

5:05 a.m.-5:55 p.m.

2 stops9h 50m

Boston Logan Intl

Wed 7/5

12:25 p.m.-11:00 p.m.

2 stops13h 35m

C$ 466

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Fri 16/5

10:11 p.m.-6:40 a.m.

Nonstop5h 29m

Boston Logan Intl

Tue 20/5

7:07 p.m.-10:21 p.m.

Nonstop6h 14m

C$ 481

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Tue 27/5

6:59 p.m.-7:40 a.m.

1 stop9h 41m

Boston Logan Intl

Thu 26/6

7:20 a.m.-10:38 a.m.

Nonstop6h 18m

C$ 531

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Sun 4/5

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

1 stop9h 00m

Boston Logan Intl

Wed 7/5

7:00 a.m.-10:13 a.m.

Nonstop6h 13m

C$ 610

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Wed 7/5

3:37 p.m.-11:59 p.m.

Nonstop5h 22m

C$ 172

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Wed 7/5

6:00 a.m.-8:41 a.m.

2 stops23h 41m

C$ 176

Flights are sorted by cheapest round-trip flights first.

Deals found on 15/4

Showing 1-10 of 17 results
1
2

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 11 April 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$ 298). 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 15 April 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 29% on your trip compared to booking a flight in the morning.

Weekly flight availability from Seattle to Boston

Explore weekly flight availability from Seattle to Boston. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated 15 April 2025.

The most flights from SEA to BOS are scheduled on a Saturday (31 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (21 on average).

Rainfall in Boston by month

Plan your trip to Boston by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Boston ranges from 78.0 - 101.0 mm per month. March is typically the wettest month, when rainfall can reach 101.0 mm. July is typically the driest time to visit Boston when rainfall is around 78.0 mm.

Temperature in Boston by month

Plan your trip to Boston by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Boston, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 23.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around -1.0 C).

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 15 April 2025.
To help decide which airline to fly from Seattle to Boston, see what other customers have to say about Alaska Airlines, Southwest and Delta. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
9,871 reviews
Check prices

Food

7.1

Crew

8.5

Entertainment

7.1

Comfort

7.9

Boarding

8.2

Overall

8.0

Reviews

1 / 20
10.0
Excellent

David,Aug 2024

SFO - BOS

Could not watch a movie, asked for help. Could not get extra cookies
Alaska Airlines
8.0
Very good
9,871 reviews
Alaska Airlines
8.0
Very good
9,871 reviews
Check prices

Food

7.1

Crew

8.5

Entertainment

7.1

Comfort

7.9

Boarding

8.2

Overall

8.0

Reviews

1 / 20
10.0
Excellent

David,Aug 2024

SFO - BOS

Could not watch a movie, asked for help. Could not get extra cookies
Southwest
8.0
Very good
4,279 reviews
Alaska Airlines
8.0
Very good
9,871 reviews
Check prices

Food

7.1

Crew

8.5

Entertainment

7.1

Comfort

7.9

Boarding

8.2

Overall

8.0

Reviews

1 / 20
10.0
Excellent

David,Aug 2024

SFO - BOS

Could not watch a movie, asked for help. Could not get extra cookies
Delta
8.0
Very good
7,917 reviews
Alaska Airlines
8.0
Very good
9,871 reviews
Check prices

Food

7.1

Crew

8.5

Entertainment

7.1

Comfort

7.9

Boarding

8.2

Overall

8.0

Reviews

1 / 20
10.0
Excellent

David,Aug 2024

SFO - BOS

Could not watch a movie, asked for help. Could not get extra cookies
Hawaiian Airlines
7.9
Good
2,374 reviews
Alaska Airlines
8.0
Very good
9,871 reviews
Check prices

Food

7.1

Crew

8.5

Entertainment

7.1

Comfort

7.9

Boarding

8.2

Overall

8.0

Reviews

1 / 20
10.0
Excellent

David,Aug 2024

SFO - BOS

Could not watch a movie, asked for help. Could not get extra cookies
United Airlines
7.4
Good
8,656 reviews
Alaska Airlines
8.0
Very good
9,871 reviews
Check prices

Food

7.1

Crew

8.5

Entertainment

7.1

Comfort

7.9

Boarding

8.2

Overall

8.0

Reviews

1 / 20
10.0
Excellent

David,Aug 2024

SFO - BOS

Could not watch a movie, asked for help. Could not get extra cookies

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 27 flights from Seattle/Tacoma Intl to Logan Intl, all of which are around 5h 29m 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 50 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

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

    Alaska Airlines, at C$ 343, was found to be the cheapest airline from Seattle to Boston.Alternate airlines to your destination round-trip include JetBlue and United Airlines. You may be able to fly from Seattle to Boston for 34% less than the average price by searching for these airlines.

  • What are the cheapest airlines to fly from Seattle to Boston one-way?

    The cheapest airline one-way is Delta, with whom users have recently found tickets for as low as C$ 172. However, be on the lookout for offers from Spirit Airlines and JetBlue, as they are both options that can get you from Seattle to Boston for a low price.

  • 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%), LATAM Airlines (100%), Condor (92%).

  • What are the cheapest flights from Seattle to Boston?

    While on average a flight from Seattle to Boston is generally C$ 309, our data shows the cheapest flight currently is C$ 137. When looking at the most popular route, (Seattle/Tacoma Intl - Boston Logan Intl), you can expect to pay C$ 459 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$ 298). 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 Seattle?

Book flights to Seattle if you plan to visit one of these locations
Seekonk
Waltham
Warwick
Medford
Braintree
Somerville
Dedham
Rockland
Chelsea
Plymouth
Quincy
Old Orchard Beach
Revere
Hampton
Lynn
Andover
Watertown
Kennebunk
Amherst
Sturbridge

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Other flights to Boston

Explore flights to Boston departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on 15 April 2025.
Calgary to Boston flights
Toronto Island to Boston flights
Vancouver Intl to Boston flights
Ottawa to Boston flights
Pierre Elliott Trudeau Intl to Boston flights
Pearson Intl to Boston flights
Boston to Fort Myers flights
Boston to Fort Myers flights
Boston to Atlanta flights
Boston to Tampa flights
Boston to Tampa flights
Boston to Miami flights
Boston to Fort Lauderdale flights
Boston to Calgary flights
Boston to Nashville flights
Boston to Orlando Airport flights
Boston to San Salvador flights
Boston to Philadelphia flights
Boston to Toronto Pearson Intl Airport flights
Boston to Vancouver Intl Airport flights
Boston to Toronto Island Airport flights
Boston to Halifax flights
Boston to Miami flights
Boston to New Orleans flights

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 15 April 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapestC$ 164AverageC$ 392FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
JetBlueCheapestC$ 178AverageC$ 343FlexibilityNo cancel feeOn-time62%
Search JetBlue flights
Alaska AirlinesCheapestC$ 255AverageC$ 558FlexibilityNo 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.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.