HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Seattle

$128+ Cheap flights from Boston to Seattle (BOS - SEA)

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 4/14. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — SEA
Apr 14 — Apr 211
Tue 4/14
Tue 4/21
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Boston to Seattle with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.
Cheapflights Tip: The best prices from Boston Logan Intl to Seattle/Tacoma Intl are usually found in May or September, booked 43 days in advance, depart on a Wednesday or Thursday and return on a Tuesday

Cheap flight deals from Boston to Seattle

Cheapest flights from Boston to Seattle
Explore the most affordable flight options available from Boston to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 15, 2026.

This United Airlines deal was found by Cheapflights users on 3/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/14:52 pm
BOS
-
SEA
1 stop9h 07m
United Airlines
Tue 5/51:07 pm
SEA
-
BOS
1 stop7h 52m
United Airlines
Deal found 3/11$221
This Southwest deal was found by Cheapflights users on 3/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/76:20 pm
BOS
-
SEA
1 stop8h 50m
Southwest
Tue 5/126:00 am
SEA
-
BOS
1 stop7h 05m
Southwest
Deal found 3/11$226
This Southwest deal was found by Cheapflights users on 3/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/285:35 am
BOS
-
SEA
1 stop8h 20m
Southwest
Thu 5/76:15 pm
SEA
-
BOS
2 stops10h 50m
Southwest
Deal found 3/11$231
This United Airlines deal was found by Cheapflights users on 3/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/2912:30 pm
BOS
-
SEA
1 stop9h 30m
United Airlines
Sat 5/211:00 pm
SEA
-
BOS
1 stop8h 20m
United Airlines
Deal found 3/11$237
This United Airlines deal was found by Cheapflights users on 3/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/294:28 pm
BOS
-
SEA
1 stop9h 14m
United Airlines
Fri 5/11:07 pm
SEA
-
BOS
1 stop7h 52m
United Airlines
Deal found 3/11$242
This United Airlines deal was found by Cheapflights users on 3/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/26:00 am
BOS
-
SEA
1 stop8h 48m
United Airlines
Sat 5/211:00 pm
SEA
-
BOS
1 stop8h 20m
United Airlines
Deal found 3/10$247
This United Airlines deal was found by Cheapflights users on 3/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/14:52 pm
BOS
-
SEA
1 stop9h 07m
United Airlines
Wed 5/61:07 pm
SEA
-
BOS
1 stop7h 52m
United Airlines
Deal found 3/10$252
This Travelocity deal was found by Cheapflights users on 3/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/147:00 am
BOS
-
SEA
Nonstop6h 20m
Multiple Airlines
Sun 5/177:05 am
SEA
-
BOS
1 stop20h 15m
Multiple Airlines
Deal found 3/11$253
This United Airlines deal was found by Cheapflights users on 3/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/306:00 am
BOS
-
SEA
1 stop8h 39m
United Airlines
Tue 5/51:07 pm
SEA
-
BOS
1 stop7h 52m
United Airlines
Deal found 3/11$255
This United Airlines deal was found by Cheapflights users on 3/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/255:20 pm
BOS
-
SEA
1 stop9h 39m
United Airlines
Sat 5/211:00 pm
SEA
-
BOS
1 stop8h 20m
United Airlines
Deal found 3/10$257
This American Airlines deal was found by Cheapflights users on 3/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/253:59 pm
BOS
-
SEA
1 stop9h 39m
American Airlines
Sat 5/21:19 pm
SEA
-
BOS
1 stop8h 06m
American Airlines
Deal found 3/11$258

Find flight deals from Boston to Seattle

Discover tips and strategies to find the most affordable flight options for your journey from Boston (BOS) to Seattle (SEA). 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 March 15, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$221
(United Airlines)

One-way from

$128
(American Airlines)

Popular in

December

Cheapest in

May

Average price

$334

Good round-trip deal

$307 or less

Good one-way deal

$203 or less
Provider with most accurate pricing for Boston Logan Intl-Seattle/Tacoma Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Boston Logan Intl-Seattle/Tacoma Intl flights.
Search Deals
From Boston Logan Intl to Seattle/Tacoma Intl
Search Deals
One-way flight from Boston Logan Intl to Seattle/Tacoma Intl
Search Deals
Highest demand for flights based on searches. 12% potential increase in price ($54 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($14 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 2026
Search Deals
Price to beat on a round-trip flight from Boston Logan Intl to Seattle/Tacoma Intl.
Search Deals
Price to beat on a one-way flight from Boston Logan Intl to Seattle/Tacoma Intl.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Boston to Seattle 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 2,558,603 searches. Data last updated March 15, 2026.
Use the filters below to find and compare flights from Boston to Seattle that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

BostonSeattle

BOS - SEA

BOSSEA

Boston Logan Intl

Sat 5/2

2:22 pm-8:53 pm

1 stop9h 31m

Seattle/Tacoma Intl

Tue 5/5

1:07 pm-11:59 pm

1 stop7h 52m

$311

BostonSeattle

BOS - SEA

BOSSEA

Boston Logan Intl

Wed 4/1

2:00 pm-11:55 pm

1 stop12h 55m

Seattle/Tacoma Intl

Tue 4/7

7:10 pm-8:15 am

2 stops10h 05m

$316
Quickest round-trip

BostonSeattle

BOS - SEA

BOSSEA

Boston Logan Intl

Thu 6/11

7:10 am-10:33 am

Nonstop6h 23m

Seattle/Tacoma Intl

Tue 6/16

11:45 am-8:13 pm

Nonstop5h 28m

$347

BostonSeattle

BOS - SEA

BOSSEA

Boston Logan Intl

Wed 4/8

11:17 am-10:42 pm

2 stops14h 25m

Seattle/Tacoma Intl

Wed 4/15

11:59 pm-4:22 pm

2 stops13h 23m

$368

BostonSeattle

BOS - SEA

BOSSEA

Boston Logan Intl

Mon 4/27

5:56 pm-10:26 am

1 stop19h 30m

Seattle/Tacoma Intl

Mon 5/4

10:45 pm-7:12 am

Nonstop5h 27m

$402

BostonSeattle

BOS - SEA

BOSSEA

Boston Logan Intl

Tue 3/31

2:00 pm-12:20 am

2 stops13h 20m

Seattle/Tacoma Intl

Tue 4/7

11:45 pm-12:15 pm

2 stops9h 30m

$411

BostonSeattle

BOS - SEA

BOSSEA

Boston Logan Intl

Mon 4/13

6:55 pm-12:05 am

1 stop8h 10m

Seattle/Tacoma Intl

Mon 4/20

11:55 pm-11:00 am

1 stop8h 05m

$423

BostonSeattle

BOS - SEA

BOSSEA

Boston Logan Intl

Wed 4/22

2:25 pm-11:35 pm

2 stops12h 10m

Seattle/Tacoma Intl

Mon 4/27

6:15 pm-8:15 am

2 stops11h 00m

$445

BostonSeattle

BOS - SEA

BOSSEA

Boston Logan Intl

Sat 3/21

4:25 pm-10:53 pm

1 stop9h 28m

Seattle/Tacoma Intl

Tue 3/24

7:00 am-5:17 pm

1 stop7h 17m

$457

BostonSeattle

BOS - SEA

BOSSEA

Boston Logan Intl

Fri 5/15

3:45 pm-12:05 am

1 stop11h 20m

Seattle/Tacoma Intl

Mon 5/18

11:55 pm-12:15 pm

2 stops9h 20m

$458

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/10

Showing 1-10 of 23 resultsSorted by cheapest first
1
2
3

Compare providers for flights from Boston to Seattle

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Boston to Seattle in March.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
PricelinePrice Accuracy1 starTrust Score*3 stars
CheapTicketsDealPrice Accuracy3 starsTrust Score*3 stars
JustAirTicketPrice Accuracy-Trust Score*1 star
CheapOairPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
Trip.comPrice Accuracy1 starTrust Score*3 stars
CheapfaremartPrice Accuracy-Trust Score*1 star
MytripPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Boston-Seattle flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Boston-Seattle flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Boston-Seattle flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Boston-Seattle flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Boston-Seattle flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Boston to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from Boston 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 Boston to Seattle

How far ahead should I book a flight from Boston to Seattle?

Use this chart to determine the optimal time to book a round-trip flight from Boston to Seattle. Price data was last updated on March 13, 2026.

The price you pay for your flight from Boston to Seattle may vary depending on when you book. For the best chance of a lower fare, look to book 43 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

What is the cheapest month to book a flight from Boston to Seattle?

Currently, September is the cheapest month in which you can book a flight from Boston to Seattle (average of $118). Flying from Boston to Seattle in February is currently the most expensive (average of $257). 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 BOS to SEA?

Find hourly flight availability from Boston to Seattle. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated March 15, 2026.

When flying from Boston to Seattle, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

The best insider tips for Boston to Seattle flights

AI-powered summary based on content written by travel experts. AI can make mistakes.
Cheapflights partnered with top experts to bring you the best recommendations for your Boston to Seattle trip
Our travel experts
Paul Rubio

Paul Rubio

Expert on BOS

Travel journalist and photographer Paul Rubio is a Miami native (and current resident), who has lived in nine countries and traveled to 137. He is an expert in luxury travel, eco-travel, loyalty programs, hotels, airports and airlines. He is a contributing editor at AFAR, Condé Nast Traveler, LUXURY Magazine, and Palm Beach Illustrated.

Read more
Brandon Schultz

Brandon Schultz

Expert on SEA

Brandon Schultz is an award-winning food and travel writer based in New York City. His work has appeared in Forbes, AAA, Thrillist, Travel + Leisure, and The Daily Meal, among many others, and he is the author of 6 books, including 3 cookbooks.

Read more

Reviews of airlines servicing Seattle

Get insights into the airlines that provide service to Seattle. 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 Seattle. Reviews last updated March 15, 2026.
Peruse reviews from past customers who have flown with Alaska Airlines,Delta, andHawaiian Airlines from Boston to Seattle to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
7.9
Good
12,052 reviews

Boarding

8.1

Overall

7.9

Comfort

7.8

Food

7.1

Crew

8.5

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.
Alaska Airlines
7.9
Good
12,052 reviews
Alaska Airlines
7.9
Good
12,052 reviews

Boarding

8.1

Overall

7.9

Comfort

7.8

Food

7.1

Crew

8.5

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.
Delta
7.9
Good
8,296 reviews
Alaska Airlines
7.9
Good
12,052 reviews

Boarding

8.1

Overall

7.9

Comfort

7.8

Food

7.1

Crew

8.5

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.
Hawaiian Airlines
7.8
Good
2,839 reviews
Alaska Airlines
7.9
Good
12,052 reviews

Boarding

8.1

Overall

7.9

Comfort

7.8

Food

7.1

Crew

8.5

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.
JetBlue
7.2
Good
2,907 reviews
Alaska Airlines
7.9
Good
12,052 reviews

Boarding

8.1

Overall

7.9

Comfort

7.8

Food

7.1

Crew

8.5

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.
American Airlines
7.1
Good
11,471 reviews
Alaska Airlines
7.9
Good
12,052 reviews

Boarding

8.1

Overall

7.9

Comfort

7.8

Food

7.1

Crew

8.5

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.

Related info for your journey

Find useful and relevant information for your journey from Boston to Seattle. 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 Boston to Seattle?

    You will need to book a flight from Boston Logan Intl to Seattle/Tacoma Intl if you want to fly from Boston to Seattle. At least 8 different airlines have flights from Logan Intl (BOS) to Seattle/Tacoma Intl (SEA) on a regular basis. There are 14 flights to Seattle from the Boston airport per day. If you manage to book one that is nonstop, then you can expect the flight time from BOS to SEA to be around 6h 07m.

  • How popular is this Boston to Seattle flight route?

    Flights from Boston Logan Intl to Seattle/Tacoma Intl have been viewed 49 times in the past calendar month.

  • How long is the flight from Boston to Seattle?

    Departing from Boston to Seattle will take you 6h 23m. The distance between Boston and Seattle is about 2487 mi. Both multi-stop and nonstop flights can be found to your destination and back.

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

    According to our current data, JetBlue ($126), Hawaiian Airlines ($128), and Delta ($149) offers the cheapest pricing from Boston to Seattle. These flights start at 66% lower than the current average price 3 months from now.

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

    One-way options have recently been found by users for as low as $103 on American Airlines. Other airlines that offer cheap prices include JetBlue from $108 and Hawaiian Airlines from $118 one-way.

  • What are the most reliable airlines from Boston to Seattle?

    Consider Qatar Airways (72%), Scandinavian Airlines (72%) or Japan Airlines (71%) when booking your flight. These represent the most reliable airlines when flying from Boston to Seattle.

  • What are the cheapest flights from Boston to Seattle?

    On average you can expect to pay $1,146 for a flight from Boston to Seattle. The cheapest flight overall is $128 while the most popular route, (Boston Logan Intl - Seattle/Tacoma Intl) is currently priced at $252.

  • Can I find deals for flights from Boston to Seattle that include hotel bookings?

    Yes. In addition to deals on Boston to Seattle flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Boston to Seattle?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Boston to Seattle.

  • Can I find deals for business class flights from Boston to Seattle?

    Yes. Cheapflights offers flight deals from Boston to Seattle 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 Boston to Seattle?

    Currently, September is the cheapest month in which you can book a flight from Boston to Seattle (average of $118). Flying from Boston to Seattle in February is currently the most expensive (average of $257). 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

Traveling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
SeaTac
Tacoma
Ocean Shores
Olympia
Kent
Lynnwood
Edmonds
Lacey
Renton
Puyallup
Kirkland
Ellensburg
Tukwila
Fife
Lakewood
Aberdeen
Shoreline
Marysville
Centralia
Federal Way

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.

Top 8 airlines flying from Boston to Seattle

Discover the top 8 airlines that operate flights from Boston to Seattle. 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 2,558,603 searches. Data last updated March 15, 2026.
AirlineCheapestAverageFlexibilityOn-time
JetBlueCheapest$126Average$335FlexibilityNo cancel feeOn-time62%
Hawaiian AirlinesCheapest$128Average$315FlexibilityNo cancel feeOn-time85%
DeltaCheapest$149Average$371FlexibilityNo cancel feeOn-timeN/A
Sun Country AirCheapest$172Average$325FlexibilityNo cancel feeOn-time83%
United AirlinesCheapest$214Average$395FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$237Average$411FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$256Average$382FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$256Average$468FlexibilityNo cancel feeOn-time71%

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.
Site
Cookie settings©2026 Cheapflights