Boston

$129+ Cheap flights from Seattle to Boston (SEA - BOS)

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 9/7. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BOS
Jul 6 — Jul 131
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Cheapflights Tip: The best prices from Seattle/Tacoma Intl to Boston Logan Intl are usually found in January or March, booked 28 days in advance, depart on a Tuesday or Wednesday and return on a Wednesday

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 July 1, 2025.

Round-trip from

$217
(Delta)

One-way from

$129
(Alaska Airlines)

Popular in

August

Cheapest in

January

Average price

$457

Good round-trip deal

$267 or less

Good one-way deal

$189 or less
From Seattle/Tacoma Intl to Boston Logan Intl
One-way flight from Seattle/Tacoma Intl to Boston Logan Intl
Highest demand for flights based on searches. 15% potential increase in price ($67 potential increase over avg. RT price).
Cheapest flight prices on average. 2% potential price decrease ($10 potential savings vs. average RT price).
Average for round-trip flights in July 2025
Price to beat on a round-trip flight from Seattle/Tacoma Intl to Boston Logan Intl.
Price to beat on a one-way flight from Seattle/Tacoma Intl to Boston Logan Intl.

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 July 1, 2025.

This Delta deal was found by Cheapflights users on 6/30. 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 9/243:38 pmSEA - BOS
Nonstop5h 21mDelta
Tue 9/307:25 amBOS - SEA
Nonstop6h 18mDelta
Deal found 6/30$217
This Alaska Airlines deal was found by Cheapflights users on 6/30. 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.
Sat 9/2011:34 pmSEA - BOS
Nonstop5h 26mAlaska Airlines
Wed 10/17:45 amBOS - SEA
1 stop12h 06mAlaska Airlines
Deal found 6/30$227
This Hawaiian Airlines deal was found by Cheapflights users on 6/30. 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.
Thu 9/183:59 pmSEA - BOS
Nonstop5h 28mHawaiian Airlines
Mon 9/296:55 pmBOS - SEA
Nonstop6h 13mHawaiian Airlines
Deal found 6/30$237
This JetBlue deal was found by Cheapflights users on 6/30. 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.
Wed 10/1511:30 amSEA - BOS
Nonstop5h 33mJetBlue
Sun 10/197:00 amBOS - SEA
Nonstop6h 19mJetBlue
Deal found 6/30$238
This Southwest deal was found by Cheapflights users on 7/1. 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 9/119:10 pmSEA - BOS
1 stop9h 50mSouthwest
Wed 9/1712:40 pmBOS - SEA
2 stops11h 15mSouthwest
Deal found 7/1$252
This American Airlines deal was found by Cheapflights users on 6/30. 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.
Mon 8/119:45 pmSEA - BOS
1 stop9h 29mAmerican Airlines
Tue 8/197:00 amBOS - SEA
1 stop10h 15mAmerican Airlines
Deal found 6/30$283
This Orbitz deal was found by Cheapflights users on 6/30. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/125:59 pmSEA - BOS
1 stop9h 11mMultiple Airlines
Thu 8/2112:57 pmBOS - SEA
2 stops14h 37mMultiple Airlines
Deal found 6/30$315

Cheapflights Fare Finder

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 2,558,603 searches. Data last updated July 1, 2025.
Use the filters below to find and compare flights from Seattle to Boston that are best for you.

Fly from

Seattle

Fly to

Boston

Route

Depart

Return

Price

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Wed 9/24

3:59 pm-12:27 am

Nonstop5h 28m

Boston Logan Intl

Tue 9/30

6:55 pm-10:08 pm

Nonstop6h 13m

$217

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Thu 9/18

3:59 pm-12:27 am

Nonstop5h 28m

Boston Logan Intl

Mon 9/29

6:55 pm-10:08 pm

Nonstop6h 13m

$237

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Wed 10/15

11:30 am-8:03 pm

Nonstop5h 33m

Boston Logan Intl

Sun 10/19

7:00 am-10:19 am

Nonstop6h 19m

$238

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Thu 9/11

9:10 pm-10:00 am

1 stop9h 50m

Boston Logan Intl

Wed 9/17

12:40 pm-8:55 pm

2 stops11h 15m

$252

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Wed 10/1

7:20 am-11:40 pm

1 stop13h 20m

Boston Logan Intl

Wed 10/15

7:05 am-10:45 am

Nonstop6h 40m

$280

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Wed 8/13

12:20 am-10:57 am

1 stop7h 37m

Boston Logan Intl

Tue 8/19

12:30 pm-6:49 pm

1 stop9h 19m

$282

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Mon 8/11

9:45 pm-10:14 am

1 stop9h 29m

Boston Logan Intl

Tue 8/19

7:00 am-2:15 pm

1 stop10h 15m

$283

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Tue 8/12

5:59 pm-6:10 am

1 stop9h 11m

Boston Logan Intl

Thu 8/21

12:57 pm-12:34 am

2 stops14h 37m

$315

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Sun 9/7

11:34 pm-8:00 am

Nonstop5h 26m

$129

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Wed 8/6

5:30 pm-8:37 am

2 stops12h 07m

$131

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/29

Showing 1-10 of 17 results
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The best insider tips for Seattle to Boston 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 Seattle to Boston trip
Airports
SEA

Plan to arrive at SEA two hours before your flight. Use SEA Spot Saver for security appointments to reduce wait times.

Read more about SEAby Brandon Schultz
BOS

Use the MBTA Silver Line for a free ride from BOS to downtown Boston, connecting with local and regional transit.

Read more about BOSby Paul Rubio
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 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.

Cheapflights Insights

Everything you need to know about your flight from Seattle to Boston

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 June 27, 2025.

Booking 28 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 $218). Flying from Seattle to Boston in June is currently the most expensive (average of $306). 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 July 1, 2025.

Unlike in the morning, when flights are generally more expensive, you can save up to 21% on flights from Seattle to Boston by exploring options for tickets in the afternoon.

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

Use this chart to determine the cheapest time to fly round-trip from Seattle to Boston. Price data was last updated on June 29, 2025.

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

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 July 1, 2025.

The most flights from SEA to BOS are scheduled on a Tuesday (39 on average). You will have fewer flight options on Friday, which is when the least amount of flights are scheduled (16 on average).

How much does it cost to fly round-trip from Seattle to Boston?

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 July 1, 2025.
Peruse reviews from past customers who have flown with Alaska Airlines, Southwest, and Delta from Seattle to Boston 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.

Boarding

8.1

Entertainment

7.1

Comfort

7.8

Food

7.1

Crew

8.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

David,Aug 2024

SFO - BOS

Could not watch a movie, asked for help. Could not get extra cookies

Boarding

8.1

Entertainment

7.1

Comfort

7.8

Food

7.1

Crew

8.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

David,Aug 2024

SFO - BOS

Could not watch a movie, asked for help. Could not get extra cookies

Boarding

8.1

Entertainment

7.1

Comfort

7.8

Food

7.1

Crew

8.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

David,Aug 2024

SFO - BOS

Could not watch a movie, asked for help. Could not get extra cookies
8.0
Very good

Boarding

8.1

Entertainment

7.1

Comfort

7.8

Food

7.1

Crew

8.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

David,Aug 2024

SFO - BOS

Could not watch a movie, asked for help. Could not get extra cookies

Boarding

8.1

Entertainment

7.1

Comfort

7.8

Food

7.1

Crew

8.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

David,Aug 2024

SFO - BOS

Could not watch a movie, asked for help. Could not get extra cookies

Boarding

8.1

Entertainment

7.1

Comfort

7.8

Food

7.1

Crew

8.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

David,Aug 2024

SFO - BOS

Could not watch a movie, asked for help. Could not get extra cookies

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 29 flights from Seattle/Tacoma Intl to Logan Intl, all of which are around 5h 12m for a nonstop flight. You can also purchase a plane ticket from 9 airlines when you book a flight from Seattle/Tacoma Intl to Boston.

  • How popular is this Seattle to Boston flight route?

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

    Our cheapest airline available from Seattle to Boston is Delta. Our recent data shows that you can find tickets from as low as $217 on this airline. Additional options worth looking into are Alaska Airlines and Hawaiian Airlines, starting at $227 and $237 round-trip. Delta is currently priced 39% below the average price you’ll pay for this route.

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

    For one-way options, check prices for Alaska Airlines. According to our data, you can fly for as low as $129. Users have also found prices from $131 and $133 on Spirit Airlines and American Airlines, respectively.

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

    Before booking your flight to Boston from Seattle, check out the most reliable airlines to get you to your destination on time: EL AL (97%), Scandinavian Airlines (96%), Air France( 95%).

  • What are the cheapest flights from Seattle to Boston?

    Looking at all options, your cheapest flight can be booked for $137. While the most popular route (Seattle/Tacoma Intl - Boston Logan Intl) can be booked for $217 on average our data indicates $946 when flying from Seattle to Boston.

  • 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 $218). Flying from Seattle to Boston in June is currently the most expensive (average of $306). 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
Cambridge
Medford
Watertown
Warwick
Seabrook
Waltham
Framingham
Cranston
Randolph
Chestnut Hill
Chelsea
Brockton
York Beach
Saco
Burlington
West Yarmouth
Smithfield
Swansea
Lincoln
Quincy

Browse thousands of different options on Cheapflights for your next trip

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Top 9 airlines flying from Seattle to Boston

Discover the top 9 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 2,558,603 searches. Data last updated July 1, 2025.
AirlineCheapestAverageFlexibilityOn-time
Hawaiian AirlinesCheapest$118Average$383FlexibilityNo cancel feeOn-time85%
JetBlueCheapest$139Average$337FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$145Average$252FlexibilityNo cancel feeOn-time65%
DeltaCheapest$160Average$383FlexibilityNo cancel feeOn-timeN/A
Sun Country AirCheapest$198Average$382FlexibilityNo cancel feeOn-time83%
American AirlinesCheapest$216Average$435FlexibilityNo cancel feeOn-time71%
Alaska AirlinesCheapest$232Average$465FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$236Average$377FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$326Average$436FlexibilityNo cancel feeOn-time63%

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