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$125+ 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 9/25. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — SEA
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
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 Tuesday

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 June 12, 2025.

Round-trip from

$197
(JetBlue)

One-way from

$129
(JetBlue)

Popular in

August

Cheapest in

January

Average price

$416

Good round-trip deal

$294 or less

Good one-way deal

$179 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. 20% potential increase in price ($89 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($13 potential savings vs. average RT price).
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Average for round-trip flights in June 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 June 12, 2025.

This Delta deal was found by Cheapflights users on 6/10. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/246:35 pmBOS - SEA
Nonstop6h 38mDelta
Wed 10/110:00 pmSEA - BOS
Nonstop5h 34mDelta
Deal found 6/10$197
This JetBlue deal was found by Cheapflights users on 6/10. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/137:00 amBOS - SEA
Nonstop6h 19mJetBlue
Wed 9/2411:30 amSEA - BOS
Nonstop5h 33mJetBlue
Deal found 6/10$207
This Alaska Airlines deal was found by Cheapflights users on 6/10. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/246:40 pmBOS - SEA
Nonstop6h 10mAlaska Airlines
Thu 9/253:59 pmSEA - BOS
Nonstop5h 24mAlaska Airlines
Deal found 6/10$217
This American Airlines deal was found by Cheapflights users on 6/11. 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.
Wed 8/135:29 amBOS - SEA
1 stop11h 46mAmerican Airlines
Wed 8/206:34 amSEA - BOS
1 stop9h 07mAmerican Airlines
Deal found 6/11$220
This Hawaiian Airlines deal was found by Cheapflights users on 6/11. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/267:45 amBOS - SEA
1 stop12h 06mHawaiian Airlines
Tue 9/93:59 pmSEA - BOS
Nonstop5h 24mHawaiian Airlines
Deal found 6/11$232
This Southwest deal was found by Cheapflights users on 6/11. 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.
Wed 7/3011:35 amBOS - SEA
1 stop14h 40mSouthwest
Tue 8/55:15 amSEA - BOS
1 stop12h 30mSouthwest
Deal found 6/11$293
This United Airlines deal was found by Cheapflights users on 6/11. 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 7/97:12 pmBOS - SEA
1 stop8h 44mUnited Airlines
Wed 7/237:00 pmSEA - BOS
1 stop8h 01mUnited Airlines
Deal found 6/11$306
This Mytrip deal was found by Cheapflights users on 6/11. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/84:44 pmBOS - SEA
2 stops26h 41mSpirit Airlines
Sun 7/135:30 pmSEA - BOS
2 stops23h 23mSpirit Airlines
Deal found 6/11$319
This CheapOair deal was found by Cheapflights users on 6/12. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/46:30 amBOS - SEA
1 stop19h 17mMultiple Airlines
Tue 7/155:30 pmSEA - BOS
2 stops12h 07mMultiple Airlines
Deal found 6/12$338
This Sun Country Air deal was found by Cheapflights users on 6/10. 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 Sun Country Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/46:30 amBOS - SEA
1 stop19h 17mSun Country Air
Mon 7/146:03 pmSEA - BOS
1 stop12h 16mSun Country Air
Deal found 6/10$360

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 June 12, 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

Wed 9/24

11:00 am-2:31 pm

Nonstop6h 31m

Seattle/Tacoma Intl

Tue 9/30

3:20 pm-11:44 pm

Nonstop5h 24m

$197

BostonSeattle

BOS - SEA

BOSSEA

Boston Logan Intl

Sat 9/13

7:00 am-10:19 am

Nonstop6h 19m

Seattle/Tacoma Intl

Wed 9/24

11:30 am-8:03 pm

Nonstop5h 33m

$207

BostonSeattle

BOS - SEA

BOSSEA

Boston Logan Intl

Wed 8/13

5:29 am-2:15 pm

1 stop11h 46m

Seattle/Tacoma Intl

Wed 8/20

6:34 am-6:41 pm

1 stop9h 07m

$220

BostonSeattle

BOS - SEA

BOSSEA

Boston Logan Intl

Tue 8/26

7:20 am-10:33 am

Nonstop6h 13m

Seattle/Tacoma Intl

Wed 8/27

3:59 pm-12:23 am

Nonstop5h 24m

$222

BostonSeattle

BOS - SEA

BOSSEA

Boston Logan Intl

Tue 8/26

7:45 am-4:51 pm

1 stop12h 06m

Seattle/Tacoma Intl

Tue 9/9

3:59 pm-12:23 am

Nonstop5h 24m

$232

BostonSeattle

BOS - SEA

BOSSEA

Boston Logan Intl

Wed 7/30

11:35 am-11:15 pm

1 stop14h 40m

Seattle/Tacoma Intl

Tue 8/5

5:15 am-8:45 pm

1 stop12h 30m

$293

BostonSeattle

BOS - SEA

BOSSEA

Boston Logan Intl

Wed 7/9

7:12 pm-12:56 am

1 stop8h 44m

Seattle/Tacoma Intl

Wed 7/23

7:00 pm-6:01 am

1 stop8h 01m

$306

BostonSeattle

BOS - SEA

BOSSEA

Boston Logan Intl

Tue 7/8

4:44 pm-4:25 pm

2 stops26h 41m

Seattle/Tacoma Intl

Sun 7/13

5:30 pm-7:53 pm

2 stops23h 23m

$319

BostonSeattle

BOS - SEA

BOSSEA

Boston Logan Intl

Tue 7/15

10:14 am-7:59 am

1 stop24h 45m

Seattle/Tacoma Intl

Tue 7/22

5:30 pm-8:37 am

2 stops12h 07m

$343

BostonSeattle

BOS - SEA

BOSSEA

Boston Logan Intl

Fri 7/4

6:30 am-10:47 pm

1 stop19h 17m

Seattle/Tacoma Intl

Mon 7/14

6:03 pm-9:19 am

1 stop12h 16m

$360

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/10

Showing 1-10 of 20 results
1
2

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 June 9, 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 July is currently the most expensive (average of $391). 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 June 12, 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 June 8, 2025.

Travelers seeking maximum savings on their Boston to Seattle flight should consider departing on Tuesday 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 June 12, 2025.

The most flights from BOS to SEA are scheduled on a Wednesday (40 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (4 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 June 12, 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
10,000 reviews

Entertainment

7.1

Crew

8.5

Overall

8.0

Comfort

7.8

Boarding

8.1

Food

7.1

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
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Crew

8.5

Overall

8.0

Comfort

7.8

Boarding

8.1

Food

7.1

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
4,287 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Crew

8.5

Overall

8.0

Comfort

7.8

Boarding

8.1

Food

7.1

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
7,950 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Crew

8.5

Overall

8.0

Comfort

7.8

Boarding

8.1

Food

7.1

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
2,494 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Crew

8.5

Overall

8.0

Comfort

7.8

Boarding

8.1

Food

7.1

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
8,790 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Crew

8.5

Overall

8.0

Comfort

7.8

Boarding

8.1

Food

7.1

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 9 different airlines have flights from Logan Intl (BOS) to Seattle/Tacoma Intl (SEA) on a regular basis. There are 19 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 53 times in the past calendar month.

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

    According to our current data, JetBlue ($197), Hawaiian Airlines ($207), and American Airlines ($217) offers the cheapest pricing from Boston to Seattle. These flights start at 44% 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 $129 on JetBlue. Other airlines that offer cheap prices include Southwest from $134 and American Airlines from $141 one-way.

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

    Consider LATAM Airlines (94%), Finnair (91%) or JetBlue (89%) 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 $1,121 for a flight from Boston to Seattle. The cheapest flight overall is $118 while the most popular route, (Boston Logan Intl - Seattle/Tacoma Intl) is currently priced at $197.

  • 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 $391). 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
Lakewood
Ocean Shores
Lacey
Leavenworth
Federal Way
Lynnwood
Olympia
Shoreline
Kent
Cle Elum
Centralia
Kirkland
Aberdeen
Renton
Shelton
Silverdale
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 June 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
JetBlueCheapest$143Average$359FlexibilityNo cancel feeOn-time62%
Hawaiian AirlinesCheapest$153Average$377FlexibilityNo cancel feeOn-time85%
DeltaCheapest$170Average$377FlexibilityNo cancel feeOn-timeN/A
Sun Country AirCheapest$177Average$388FlexibilityNo cancel feeOn-time83%
Spirit AirlinesCheapest$192Average$288FlexibilityNo cancel feeOn-time65%
American AirlinesCheapest$219Average$462FlexibilityNo cancel feeOn-time71%
Alaska AirlinesCheapest$226Average$439FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$228Average$391FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$351Average$446FlexibilityNo cancel feeOn-time63%

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