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$121+ 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 5/6. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — SEA
Apr 21 — Apr 281
Mon 4/21
Mon 4/28
1 adult, Economy
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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

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3. Compare prices and book

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Cheapflights Tip: The best prices from Boston Logan Intl to Seattle/Tacoma Intl are usually found in January or March, booked 90 days in advance, depart on a Thursday or Wednesday and return on a Friday

Cheap 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 April 16, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$225
(SmartFares)

One-way from

$121
(Mytrip)

Popular in

July

Cheapest in

January

Average price

$326

Good round-trip deal

$309 or less

Good one-way deal

$180 or less
Provider with most accurate pricing for Boston Logan Intl-Seattle/Tacoma Intl flight deals.
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Provider most trusted by Cheapflights users for Boston Logan Intl-Seattle/Tacoma Intl flights.
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From Boston Logan Intl to Seattle/Tacoma Intl
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One-way flight from Boston Logan Intl to Seattle/Tacoma Intl
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Highest demand for flights based on searches. 27% potential increase in price ($139 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($15 potential savings vs. average RT price).
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Average for round-trip flights in April 2025
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Price to beat on a round-trip flight from Boston Logan Intl to Seattle/Tacoma Intl.
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Price to beat on a one-way flight from Boston Logan Intl to Seattle/Tacoma Intl.
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Find 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 April 16, 2025.

This SmartFares deal was found by Cheapflights users on 4/16. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/37:00 amBOS - SEA
Nonstop6h 13mAlaska Airlines
Fri 5/93:49 pmSEA - BOS
Nonstop5h 23mAlaska Airlines
Deal found 4/16$225
This Kiwi.com deal was found by Cheapflights users on 4/16. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/37:00 amBOS - SEA
Nonstop6h 13mHawaiian Airlines
Fri 5/93:49 pmSEA - BOS
Nonstop5h 23mHawaiian Airlines
Deal found 4/16$242
This JetBlue deal was found by Cheapflights users on 4/16. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/37:05 amBOS - SEA
Nonstop6h 20mJetBlue
Fri 5/911:38 amSEA - BOS
Nonstop5h 32mJetBlue
Deal found 4/16$246
This Mytrip deal was found by Cheapflights users on 4/15. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/133:49 pmBOS - SEA
2 stops35h 21mSpirit Airlines
Tue 5/203:20 pmSEA - BOS
2 stops28h 36mSpirit Airlines
Deal found 4/15$258
This Delta deal was found by Cheapflights users on 4/15. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/157:07 pmBOS - SEA
Nonstop6h 14mDelta
Sat 5/2410:11 pmSEA - BOS
Nonstop5h 29mDelta
Deal found 4/15$262
This Expedia deal was found by Cheapflights users on 4/15. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/77:00 amBOS - SEA
Nonstop6h 13mMultiple Airlines
Sat 5/103:20 pmSEA - BOS
2 stops14h 21mMultiple Airlines
Deal found 4/15$265
This American Airlines deal was found by Cheapflights users on 4/16. 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 5/35:30 pmBOS - SEA
1 stop8h 39mAmerican Airlines
Fri 5/910:59 pmSEA - BOS
1 stop7h 57mAmerican Airlines
Deal found 4/16$266
This United Airlines deal was found by Cheapflights users on 4/16. 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 4/305:30 pmBOS - SEA
1 stop10h 28mUnited Airlines
Wed 5/77:15 pmSEA - BOS
1 stop7h 24mUnited Airlines
Deal found 4/16$267
This Southwest deal was found by Cheapflights users on 4/16. 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 7/295:20 pmBOS - SEA
1 stop9h 45mSouthwest
Thu 8/79:10 pmSEA - BOS
1 stop8h 00mSouthwest
Deal found 4/16$327

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 April 16, 2025.
Use the filters below to find and compare flights from Boston to Seattle that are best for you.

Fly from

Boston

Fly to

Seattle

Route

Depart

Return

Price

BostonSeattle

BOS - SEA

BOSSEA

Boston Logan Intl

Sat 5/3

7:00 am-10:13 am

Nonstop6h 13m

Seattle/Tacoma Intl

Fri 5/9

3:49 pm-12:12 am

Nonstop5h 23m

$225

BostonSeattle

BOS - SEA

BOSSEA

Boston Logan Intl

Sat 5/3

7:00 am-10:13 am

Nonstop6h 13m

Seattle/Tacoma Intl

Fri 5/9

3:49 pm-12:12 am

Nonstop5h 23m

$242

BostonSeattle

BOS - SEA

BOSSEA

Boston Logan Intl

Sat 5/3

7:05 am-10:25 am

Nonstop6h 20m

Seattle/Tacoma Intl

Fri 5/9

11:38 am-8:10 pm

Nonstop5h 32m

$246

BostonSeattle

BOS - SEA

BOSSEA

Boston Logan Intl

Tue 5/13

3:49 pm-12:10 am

2 stops35h 21m

Seattle/Tacoma Intl

Tue 5/20

3:20 pm-10:56 pm

2 stops28h 36m

$258

BostonSeattle

BOS - SEA

BOSSEA

Boston Logan Intl

Wed 5/7

7:00 am-10:13 am

Nonstop6h 13m

Seattle/Tacoma Intl

Sat 5/10

3:20 pm-8:41 am

2 stops14h 21m

$265

BostonSeattle

BOS - SEA

BOSSEA

Boston Logan Intl

Sat 5/3

5:30 pm-11:09 pm

1 stop8h 39m

Seattle/Tacoma Intl

Fri 5/9

10:59 pm-9:56 am

1 stop7h 57m

$266

BostonSeattle

BOS - SEA

BOSSEA

Boston Logan Intl

Wed 4/30

1:54 pm-9:15 pm

1 stop10h 21m

Seattle/Tacoma Intl

Sat 5/3

7:00 am-5:23 pm

1 stop7h 23m

$267

BostonSeattle

BOS - SEA

BOSSEA

Boston Logan Intl

Wed 4/30

7:25 am-10:45 am

Nonstop6h 20m

Seattle/Tacoma Intl

Sat 5/17

3:55 pm-9:08 am

2 stops14h 13m

$305

BostonSeattle

BOS - SEA

BOSSEA

Boston Logan Intl

Tue 7/29

5:20 pm-12:05 am

1 stop9h 45m

Seattle/Tacoma Intl

Thu 8/7

9:10 pm-8:10 am

1 stop8h 00m

$327

BostonSeattle

BOS - SEA

BOSSEA

Boston Logan Intl

Tue 5/6

5:25 am-12:10 am

2 stops45h 45m

$121

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/15

Showing 1-10 of 19 results
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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 April.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*2 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
OvagoPrice Accuracy3 starsTrust Score*2 stars
Kiwi.comPrice Accuracy3 starsTrust Score*3 stars
PricelinePrice Accuracy1 starTrust Score*3 stars
CheapflightsfaresPrice Accuracy3 starsTrust Score*2 stars
JustAirTicketPrice Accuracy-Trust Score*3 stars
CheapfaremartPrice Accuracy-Trust Score*1 star
CheapOairPrice Accuracy1 starTrust 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 eDreams the most. eDreams 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.

The best insider tips for Boston to Seattle flights

Snippets provided in this section are AI-generated based on a summarization of Cheapflights-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
Cheapflights partnered with top experts to bring you the best recommendations for your Boston to Seattle trip
Airports
BOS

Use the FlyLogan App to pre-order meals and save time at BOS. Most restaurants participate in this convenient service.

Read more about BOSby Paul Rubio
SEA

Take the Link light rail from SEA to downtown Seattle. It's affordable, runs every 10 minutes, and takes less than 40 minutes.

Read more about SEAby Brandon Schultz
Our travel experts
Paul Rubio

Paul Rubio

Expert on BOS

Paul Rubio

Paul Rubio

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

Brandon Schultz

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

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 April 11, 2025.

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 90 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, January is the cheapest month in which you can book a flight from Boston to Seattle (average of $238). Flying from Boston to Seattle in July is currently the most expensive (average of $411). 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 April 16, 2025.

One of the essential ways to save on airfare from Boston to Seattle is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. A flight in the evening could potentially save you up to 32% on airfare.

What is the cheapest day to fly from Boston to Seattle?

Use this chart to determine the cheapest time to fly round-trip from Boston to Seattle. Price data was last updated on March 30, 2025.

Travelers seeking maximum savings on their Boston to Seattle flight should consider departing on Saturday at noon when fares are most often at their lowest. Sunday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from Boston to Seattle

Explore weekly flight availability from Boston to Seattle. 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 April 16, 2025.

The most flights from BOS to SEA are scheduled on a Monday (35 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (12 on average).

Rainfall in Seattle by month

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

In terms of precipitation, rainfall in Seattle ranges from 0.7 - 6.6 inches per month. November is typically the wettest month, when rainfall can reach 6.6 in. July is typically the driest time to visit Seattle when rainfall is around 0.7 in.

Temperature in Seattle by month

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

If weather is an important factor for your trip to Seattle, 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 66.2 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 41.0 F).

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 April 16, 2025.
To help decide which airline to fly from Boston to Seattle, see what other customers have to say about Alaska Airlines, Southwest and Delta. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
9,876 reviews

Crew

8.5

Entertainment

7.1

Boarding

8.2

Comfort

7.9

Food

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Alaska Airlines
8.0
Very good
9,876 reviews
Alaska Airlines
8.0
Very good
9,876 reviews

Crew

8.5

Entertainment

7.1

Boarding

8.2

Comfort

7.9

Food

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Southwest
8.0
Very good
4,282 reviews
Alaska Airlines
8.0
Very good
9,876 reviews

Crew

8.5

Entertainment

7.1

Boarding

8.2

Comfort

7.9

Food

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Delta
8.0
Very good
7,916 reviews
Alaska Airlines
8.0
Very good
9,876 reviews

Crew

8.5

Entertainment

7.1

Boarding

8.2

Comfort

7.9

Food

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Hawaiian Airlines
7.9
Good
2,380 reviews
Alaska Airlines
8.0
Very good
9,876 reviews

Crew

8.5

Entertainment

7.1

Boarding

8.2

Comfort

7.9

Food

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
United Airlines
7.4
Good
8,665 reviews
Alaska Airlines
8.0
Very good
9,876 reviews

Crew

8.5

Entertainment

7.1

Boarding

8.2

Comfort

7.9

Food

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

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 10 different airlines have flights from Logan Intl (BOS) to Seattle/Tacoma Intl (SEA) on a regular basis. There are 25 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 08m.

  • How popular is this Boston to Seattle flight route?

    Flights from Boston Logan Intl to Seattle/Tacoma Intl have been viewed 50 times in the past calendar month.

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

    According to our current data, Alaska Airlines ($225), Hawaiian Airlines ($242), and JetBlue ($246) offers the cheapest pricing from Boston to Seattle. These flights start at 38% 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 $121 on Spirit Airlines. Other airlines that offer cheap prices include JetBlue from $124 and United Airlines from $129 one-way.

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

    Consider LATAM Airlines (100%), Air Tahiti Nui (92%) or Qatar Airways (92%) 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 $973 for a flight from Boston to Seattle. The cheapest flight overall is $119 while the most popular route, (Boston Logan Intl - Seattle/Tacoma Intl) is currently priced at $241.

  • 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, January is the cheapest month in which you can book a flight from Boston to Seattle (average of $238). Flying from Boston to Seattle in July is currently the most expensive (average of $411). 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 Boston?

Book flights to Boston if you plan to visit one of these locations
SeaTac
Tukwila
Tacoma
Renton
Lakewood
Ocean Shores
Lacey
Leavenworth
Federal Way
Olympia
Shoreline
Cle Elum
Centralia
Aberdeen
Kent
Lynnwood
Shelton
Silverdale
Redmond
Issaquah

Browse thousands of different options on Cheapflights for your next trip

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Top 9 airlines flying from Boston to Seattle

Discover the top 9 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 April 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
Hawaiian AirlinesCheapest$128Average$334FlexibilityNo cancel feeOn-time85%
JetBlueCheapest$145Average$394FlexibilityNo cancel feeOn-time62%
Sun Country AirCheapest$174Average$377FlexibilityNo cancel feeOn-time83%
DeltaCheapest$188Average$405FlexibilityNo cancel feeOn-timeN/A
Spirit AirlinesCheapest$192Average$284FlexibilityNo cancel feeOn-time65%
American AirlinesCheapest$214Average$446FlexibilityNo cancel feeOn-time71%
Alaska AirlinesCheapest$217Average$446FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$238Average$400FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$357Average$446FlexibilityNo cancel feeOn-time63%

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