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$141+ 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 8/31. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — SEA
Aug 2 — Aug 91
Sat 8/2
Sat 8/9
1 adult, Economy
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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 31 days in advance, depart on a Wednesday or Thursday and return on a Wednesday

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 July 28, 2025.

Round-trip from

$208
(lastminute.com)

One-way from

$141
(Kiwi.com)

Popular in

August

Cheapest in

January

Average price

$443

Good round-trip deal

$304 or less

Good one-way deal

$187 or less
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. 16% potential increase in price ($70 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($11 potential savings vs. average RT price).
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Average for round-trip flights in July 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 July 28, 2025.

This lastminute.com deal was found by Cheapflights users on 7/27. 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 lastminute.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/137:00 amBOS - SEA
Nonstop6h 19mJetBlue
Sat 9/2011:30 amSEA - BOS
Nonstop5h 53mJetBlue
Deal found 7/27$208
This iWofly deal was found by Cheapflights users on 7/27. 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 iWofly is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/107:20 amBOS - SEA
Nonstop6h 13mAlaska Airlines
Wed 9/173:59 pmSEA - BOS
Nonstop5h 28mAlaska Airlines
Deal found 7/27$210
This Netflights deal was found by Cheapflights users on 7/26. 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 Netflights is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/94:00 pmBOS - SEA
Nonstop6h 15mHawaiian Airlines
Tue 9/1611:34 pmSEA - BOS
Nonstop5h 26mHawaiian Airlines
Deal found 7/26$213
This American Airlines deal was found by Cheapflights users on 7/28. 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.
Wed 8/273:59 pmBOS - SEA
1 stop10h 42mAmerican Airlines
Wed 9/36:42 amSEA - BOS
1 stop7h 57mAmerican Airlines
Deal found 7/28$235
This Kiwi.com deal was found by Cheapflights users on 7/28. 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.
Fri 9/57:20 amBOS - SEA
Nonstop6h 13mMultiple Airlines
Wed 9/103:59 pmSEA - BOS
Nonstop5h 28mMultiple Airlines
Deal found 7/28$236
This Delta deal was found by Cheapflights users on 7/28. 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.
Wed 12/35:35 pmBOS - SEA
Nonstop6h 38mDelta
Sun 12/710:00 pmSEA - BOS
Nonstop5h 34mDelta
Deal found 7/28$262
This Southwest deal was found by Cheapflights users on 7/26. 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.
Thu 9/186:30 pmBOS - SEA
1 stop8h 35mSouthwest
Mon 9/2211:10 pmSEA - BOS
1 stop11h 10mSouthwest
Deal found 7/26$272

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 July 28, 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 9/13

7:00 am-10:19 am

Nonstop6h 19m

Seattle/Tacoma Intl

Sat 9/20

11:30 am-8:23 pm

Nonstop5h 53m

$208

BostonSeattle

BOS - SEA

BOSSEA

Boston Logan Intl

Wed 9/10

7:20 am-10:33 am

Nonstop6h 13m

Seattle/Tacoma Intl

Wed 9/17

3:59 pm-12:27 am

Nonstop5h 28m

$210

BostonSeattle

BOS - SEA

BOSSEA

Boston Logan Intl

Tue 9/9

4:00 pm-7:15 pm

Nonstop6h 15m

Seattle/Tacoma Intl

Tue 9/16

11:34 pm-8:00 am

Nonstop5h 26m

$213

BostonSeattle

BOS - SEA

BOSSEA

Boston Logan Intl

Tue 9/9

12:52 pm-8:09 pm

1 stop10h 17m

Seattle/Tacoma Intl

Tue 9/16

10:11 am-10:40 pm

1 stop9h 29m

$235

BostonSeattle

BOS - SEA

BOSSEA

Boston Logan Intl

Fri 9/5

7:20 am-10:33 am

Nonstop6h 13m

Seattle/Tacoma Intl

Wed 9/10

3:59 pm-12:27 am

Nonstop5h 28m

$236

BostonSeattle

BOS - SEA

BOSSEA

Boston Logan Intl

Thu 9/18

6:30 pm-12:05 am

1 stop8h 35m

Seattle/Tacoma Intl

Mon 9/22

11:10 pm-1:20 pm

1 stop11h 10m

$272

BostonSeattle

BOS - SEA

BOSSEA

Boston Logan Intl

Thu 9/11

7:25 am-10:43 am

Nonstop6h 18m

Seattle/Tacoma Intl

Thu 9/18

3:38 pm-11:59 pm

Nonstop5h 21m

$297

BostonSeattle

BOS - SEA

BOSSEA

Boston Logan Intl

Sun 8/31

6:00 am-11:45 am

1 stop8h 45m

$141

BostonSeattle

BOS - SEA

BOSSEA

Boston Logan Intl

Fri 9/12

8:23 pm-8:07 am

1 stop14h 44m

$144

BostonSeattle

BOS - SEA

BOSSEA

Boston Logan Intl

Thu 8/28

6:59 pm-10:25 pm

Nonstop6h 26m

$149

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/27

Showing 1-10 of 17 results
1
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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 food and save time at BOS. Most eateries participate, making it a convenient option.

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 July 25, 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 31 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 June is currently the most expensive (average of $389). 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 July 28, 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 29% 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 July 27, 2025.

Travelers seeking maximum savings on their Boston to Seattle flight should consider departing on Wednesday evenings when fares are most often at their lowest. Sunday mornings 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 July 28, 2025.

The most flights from BOS to SEA are scheduled on a Sunday (46 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (37 on average).

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 July 28, 2025.
Peruse reviews from past customers who have flown with Alaska Airlines, Southwest, and Delta 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
8.0
Very good
10,000 reviews

Comfort

7.8

Boarding

8.1

Entertainment

7.1

Crew

8.5

Overall

8.0

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Jul 2025

EUG - SEA

Mobility support was fabulous No flight entertainment that I was aware of.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Boarding

8.1

Entertainment

7.1

Crew

8.5

Overall

8.0

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Jul 2025

EUG - SEA

Mobility support was fabulous No flight entertainment that I was aware of.
Southwest
8.0
Very good
4,237 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Boarding

8.1

Entertainment

7.1

Crew

8.5

Overall

8.0

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Jul 2025

EUG - SEA

Mobility support was fabulous No flight entertainment that I was aware of.
Delta
8.0
Very good
7,971 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Boarding

8.1

Entertainment

7.1

Crew

8.5

Overall

8.0

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Jul 2025

EUG - SEA

Mobility support was fabulous No flight entertainment that I was aware of.
Hawaiian Airlines
7.8
Good
2,604 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Boarding

8.1

Entertainment

7.1

Crew

8.5

Overall

8.0

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Jul 2025

EUG - SEA

Mobility support was fabulous No flight entertainment that I was aware of.
United Airlines
7.4
Good
8,893 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Boarding

8.1

Entertainment

7.1

Crew

8.5

Overall

8.0

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Jul 2025

EUG - SEA

Mobility support was fabulous No flight entertainment that I was aware of.

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 9 different airlines have flights from Logan Intl (BOS) to Seattle/Tacoma Intl (SEA) on a regular basis. There are 40 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 13m.

  • How popular is this Boston to Seattle flight route?

    Flights from Boston Logan Intl to Seattle/Tacoma Intl have been viewed 47 times in the past calendar month.

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

    According to our current data, JetBlue ($208), Alaska Airlines ($210), and Hawaiian Airlines ($213) offers the cheapest pricing from Boston to Seattle. These flights start at 39% 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 $141 on Hawaiian Airlines. Other airlines that offer cheap prices include Alaska Airlines from $144 and Delta from $149 one-way.

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

    Consider KLM (100%), Singapore Airlines (100%) or LATAM Airlines (99%) 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 $1,099 for a flight from Boston to Seattle. The cheapest flight overall is $129 while the most popular route, (Boston Logan Intl - Seattle/Tacoma Intl) is currently priced at $211.

  • 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 June is currently the most expensive (average of $389). 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
Tukwila
Tacoma
Ocean Shores
Lakewood
Lynnwood
Lacey
Leavenworth
Renton
Olympia
Puyallup
Kent
Cle Elum
Chehalis
Kirkland
Issaquah
Aberdeen
Shoreline
Federal Way
Shelton

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 July 28, 2025.
AirlineCheapestAverageFlexibilityOn-time
JetBlueCheapest$137Average$331FlexibilityNo cancel feeOn-time62%
Hawaiian AirlinesCheapest$153Average$369FlexibilityNo cancel feeOn-time85%
DeltaCheapest$156Average$365FlexibilityNo cancel feeOn-timeN/A
Sun Country AirCheapest$172Average$409FlexibilityNo cancel feeOn-time83%
Spirit AirlinesCheapest$187Average$277FlexibilityNo cancel feeOn-time65%
Alaska AirlinesCheapest$224Average$420FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$228Average$369FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$229Average$466FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$259Average$421FlexibilityNo cancel feeOn-time63%

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