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Cheap flights from Seattle to Boston from C$ 141

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 18/3. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BOS
25 Feb — 4 Mar1
1 adult

The best prices from Seattle/Tacoma Intl to Boston Logan Intl are usually found in January or February, booked 80 days in advance, depart on a Wednesday or Tuesday and return on a Saturday

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 20 February 2025.

Round-trip from

C$ 223

One-way from

C$ 141

Popular in

July

Cheapest in

January

Average price

C$ 375

Good round-trip deal

C$ 463 or less
Alaska Airlines
  • Alaska Airlines
  • 19/3-24/3
  • Nonstop
  • 11h 46m total
  • Seattle to Boston
Search Deals
Delta
  • Delta
  • 18/3
  • Nonstop
  • 5h 27m total
  • Seattle to Boston
Search Deals
Highest demand for flights based on searches. 26% potential increase in price (C$ 277 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease (C$ 32 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 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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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 20 February 2025.

Wed 19/311:30 p.m.SEA - BOS
Nonstop5h 22mAlaska Airlines
Mon 24/35:30 p.m.BOS - SEA
Nonstop6h 24mAlaska Airlines
Deal found 20/2C$ 223
Sun 30/311:55 p.m.SEA - BOS
Nonstop5h 25mJetBlue
Sat 5/47:14 p.m.BOS - SEA
Nonstop6h 28mJetBlue
Deal found 19/2C$ 251
Sat 1/38:50 a.m.SEA - BOS
Nonstop5h 34mHawaiian Airlines
Sat 1/36:24 p.m.BOS - SEA
Nonstop6h 35mHawaiian Airlines
Deal found 19/2C$ 286
Fri 21/33:35 p.m.SEA - BOS
Nonstop5h 20mDelta
Sun 6/47:15 a.m.BOS - SEA
Nonstop6h 21mDelta
Deal found 20/2C$ 322
Wed 5/311:20 p.m.SEA - BOS
1 stop8h 39mUnited Airlines
Sat 8/32:41 p.m.BOS - SEA
2 stops10h 38mUnited Airlines
Deal found 19/2C$ 345
Mon 24/38:04 p.m.SEA - BOS
2 stops22h 12mMultiple Airlines
Sun 30/37:00 a.m.BOS - SEA
Nonstop6h 28mMultiple Airlines
Deal found 19/2C$ 352
Mon 24/38:04 p.m.SEA - BOS
2 stops22h 12mSpirit Airlines
Mon 31/310:21 p.m.BOS - SEA
2 stops23h 48mSpirit Airlines
Deal found 19/2C$ 376
Wed 2/49:20 a.m.SEA - BOS
1 stop11h 45mSouthwest
Tue 8/48:55 a.m.BOS - SEA
2 stops10h 55mSouthwest
Deal found 20/2C$ 473
Mon 24/311:59 p.m.SEA - BOS
2 stops14h 08mAmerican Airlines
Mon 31/34:05 p.m.BOS - SEA
1 stop9h 00mAmerican Airlines
Deal found 19/2C$ 530
Wed 25/611:59 p.m.SEA - BOS
1 stop20h 44mSun Country Air
Thu 10/711:34 a.m.BOS - SEA
1 stop14h 16mSun Country Air
Deal found 20/2C$ 604

Find flights from Seattle to Boston within your budget

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 20 February 2025.

Fly from

Seattle

Fly to

Boston

Route

Depart

Return

Price

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Wed 19/3

11:30 p.m.-7:52 a.m.

Nonstop5h 22m

Boston Logan Intl

Thu 27/3

5:30 p.m.-8:54 p.m.

Nonstop6h 24m

C$ 223

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Sun 30/3

11:55 p.m.-8:20 a.m.

Nonstop5h 25m

Boston Logan Intl

Thu 3/4

6:59 p.m.-10:27 p.m.

Nonstop6h 28m

C$ 237

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Fri 28/3

7:30 a.m.-4:01 p.m.

Nonstop5h 31m

Boston Logan Intl

Sun 30/3

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

Nonstop6h 25m

C$ 280

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Wed 5/3

11:20 p.m.-10:59 a.m.

1 stop8h 39m

Boston Logan Intl

Sat 8/3

2:41 p.m.-10:19 p.m.

2 stops10h 38m

C$ 345

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Mon 24/3

8:04 p.m.-9:16 p.m.

2 stops22h 12m

Boston Logan Intl

Sun 30/3

7:00 a.m.-10:28 a.m.

Nonstop6h 28m

C$ 352

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Mon 24/3

8:04 p.m.-9:16 p.m.

2 stops22h 12m

Boston Logan Intl

Mon 31/3

10:21 p.m.-7:09 p.m.

2 stops23h 48m

C$ 376

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Wed 2/4

9:20 a.m.-12:05 a.m.

1 stop11h 45m

Boston Logan Intl

Tue 8/4

8:55 a.m.-4:50 p.m.

2 stops10h 55m

C$ 473

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Wed 21/5

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

1 stop9h 41m

Boston Logan Intl

Sun 25/5

6:00 a.m.-12:55 p.m.

1 stop9h 55m

C$ 482

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Mon 24/3

11:59 p.m.-5:07 p.m.

2 stops14h 08m

Boston Logan Intl

Mon 31/3

4:05 p.m.-10:05 p.m.

1 stop9h 00m

C$ 530

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Wed 25/6

11:59 p.m.-11:43 p.m.

1 stop20h 44m

Boston Logan Intl

Thu 10/7

11:34 a.m.-10:50 p.m.

1 stop14h 16m

C$ 604

Flights are sorted by cheapest round-trip flights first.

Deals found on 20/2

Showing 1-10 of 19 results
1
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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.

Travel insights for flights from Seattle to Boston

Get recent, data-driven insights about flights from Seattle to Boston including ideal travel times, pricing trends, and more.

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 14 February 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 20 February 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 40% 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 20 February 2025.

The most flights from SEA to BOS are scheduled on a Thursday (31 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (17 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 20 February 2025.
To help decide which airline to fly from Seattle to Boston, see what other customers have to say about Southwest, Alaska Airlines 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.
Southwest
8.1
Very good
4,411 reviews
Check prices

Crew

8.7

Food

7.1

Comfort

8.1

Overall

8.1

Boarding

8.2

Entertainment

7.6

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

Southwest
8.1
Very good
4,411 reviews
Southwest
8.1
Very good
4,411 reviews
Check prices

Crew

8.7

Food

7.1

Comfort

8.1

Overall

8.1

Boarding

8.2

Entertainment

7.6

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

Alaska Airlines
8.0
Very good
9,692 reviews
Southwest
8.1
Very good
4,411 reviews
Check prices

Crew

8.7

Food

7.1

Comfort

8.1

Overall

8.1

Boarding

8.2

Entertainment

7.6

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

Delta
8.0
Very good
8,220 reviews
Southwest
8.1
Very good
4,411 reviews
Check prices

Crew

8.7

Food

7.1

Comfort

8.1

Overall

8.1

Boarding

8.2

Entertainment

7.6

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

Hawaiian Airlines
7.9
Good
2,316 reviews
Southwest
8.1
Very good
4,411 reviews
Check prices

Crew

8.7

Food

7.1

Comfort

8.1

Overall

8.1

Boarding

8.2

Entertainment

7.6

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

JetBlue
7.4
Good
3,070 reviews
Southwest
8.1
Very good
4,411 reviews
Check prices

Crew

8.7

Food

7.1

Comfort

8.1

Overall

8.1

Boarding

8.2

Entertainment

7.6

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

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 23 flights from Seattle/Tacoma Intl to Logan Intl, all of which are around 5h 22m 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 46 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$ 223, was found to be the cheapest airline from Seattle to Boston.Alternate airlines to your destination round-trip include JetBlue and Delta. You may be able to fly from Seattle to Boston for 58% 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$ 141. However, be on the lookout for offers from American Airlines and Alaska Airlines, 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: EL AL (92%), Qatar Airways (91%), China Eastern (90%).

  • What are the cheapest flights from Seattle to Boston?

    While on average a flight from Seattle to Boston is generally C$ 1,477, our data shows the cheapest flight currently is C$ 210. When looking at the most popular route, (Seattle/Tacoma Intl - Boston Logan Intl), you can expect to pay C$ 403 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
Warwick
Waltham
Medford
Braintree
Somerville
Dedham
Rockland
Chelsea
Plymouth
Quincy
Old Orchard Beach
Revere
Hampton
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Watertown
Kennebunk
Amherst
Sturbridge

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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 20 February 2025.
AirlineCheapestAverageFlexibilityOn-time
JetBlueCheapestC$ 175AverageC$ 364FlexibilityNo cancel feeOn-time62%
Search JetBlue flights
Alaska AirlinesCheapestC$ 210AverageC$ 582FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
DeltaCheapestC$ 225AverageC$ 463FlexibilityNo cancel feeOn-timeN/A
Search Delta 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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