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$123+ 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 12/11. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BOS
Dec 4 — Dec 111
Thu 12/4
Thu 12/11
1 adult, Economy
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Find cheap flights from Seattle to Boston 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 Seattle/Tacoma Intl to Boston Logan Intl are usually found in January or March, booked 27 days in advance, depart on a Wednesday or Tuesday 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 November 4, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$247
(United Airlines)

One-way from

$123
(Kiwi.com)

Popular in

December

Cheapest in

January

Average price

$307

Good round-trip deal

$306 or less

Good one-way deal

$181 or less
Provider with most accurate pricing for Seattle/Tacoma Intl-Boston Logan Intl flight deals.
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Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Boston Logan Intl flights.
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From Seattle/Tacoma Intl to Boston Logan Intl
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One-way flight from Seattle/Tacoma Intl to Boston Logan Intl
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High demand for flights, 2% potential price rise
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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 November 2025
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Price to beat on a round-trip flight from Seattle/Tacoma Intl to Boston Logan Intl.
Search Deals
Price to beat on a one-way flight from Seattle/Tacoma Intl to Boston Logan Intl.
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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 November 4, 2025.

This United Airlines deal was found by Cheapflights users on 11/1. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/1511:30 pmSEA - BOS
1 stop7h 00mUnited Airlines
Wed 11/1911:00 amBOS - SEA
1 stop10h 25mUnited Airlines
Deal found 11/1$242
This United Airlines deal was found by Cheapflights users on 11/3. 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.
Mon 11/1711:30 pmSEA - BOS
1 stop8h 04mUnited Airlines
Wed 11/194:15 pmBOS - SEA
1 stop9h 13mUnited Airlines
Deal found 11/3$247
This Southwest deal was found by Cheapflights users on 11/3. 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 11/189:35 amSEA - BOS
1 stop10h 10mSouthwest
Wed 11/196:45 amBOS - SEA
1 stop14h 55mSouthwest
Deal found 11/3$252
This Kissandfly.com deal was found by Cheapflights users on 11/2. 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 Kissandfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/41:09 pmSEA - BOS
2 stops17h 48mMultiple Airlines
Wed 12/107:00 amBOS - SEA
Nonstop6h 35mMultiple Airlines
Deal found 11/2$267
This United Airlines deal was found by Cheapflights users on 11/3. 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 12/38:10 amSEA - BOS
1 stop7h 38mUnited Airlines
Wed 12/108:00 amBOS - SEA
1 stop10h 29mUnited Airlines
Deal found 11/3$272
This SmartFares deal was found by Cheapflights users on 11/2. 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.
Thu 12/411:10 pmSEA - BOS
Nonstop5h 19mAlaska Airlines
Wed 12/106:59 pmBOS - SEA
Nonstop6h 31mAlaska Airlines
Deal found 11/2$276
This United Airlines deal was found by Cheapflights users on 11/2. 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.
Tue 12/3011:59 pmSEA - BOS
1 stop8h 09mUnited Airlines
Tue 1/612:45 pmBOS - SEA
1 stop8h 29mUnited Airlines
Deal found 11/2$277
This United Airlines deal was found by Cheapflights users on 11/3. 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 12/49:25 amSEA - BOS
1 stop9h 18mUnited Airlines
Tue 12/96:00 amBOS - SEA
1 stop8h 45mUnited Airlines
Deal found 11/3$279
This Southwest deal was found by Cheapflights users on 11/3. 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 12/95:40 amSEA - BOS
2 stops10h 40mSouthwest
Tue 12/165:00 pmBOS - SEA
1 stop8h 55mSouthwest
Deal found 11/3$282
This United Airlines deal was found by Cheapflights users on 11/4. 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 12/37:34 pmSEA - BOS
1 stop9h 02mUnited Airlines
Sat 12/64:30 pmBOS - SEA
1 stop8h 58mUnited Airlines
Deal found 11/4$284
This United Airlines deal was found by Cheapflights users on 11/4. 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 12/49:25 amSEA - BOS
1 stop9h 18mUnited Airlines
Sat 12/63:25 pmBOS - SEA
1 stop8h 56mUnited Airlines
Deal found 11/4$286

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 November 4, 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

Thu 12/4

6:35 am-9:35 pm

1 stop12h 00m

Boston Logan Intl

Wed 12/10

5:30 am-1:25 pm

1 stop10h 55m

$289

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Sat 2/14

11:45 pm-10:45 am

1 stop8h 00m

Boston Logan Intl

Sat 2/21

4:15 pm-11:41 pm

1 stop10h 26m

$291

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Thu 3/12

3:35 pm-11:59 pm

Nonstop5h 24m

Boston Logan Intl

Sat 3/21

7:00 am-10:28 am

Nonstop6h 28m

$307

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Sat 3/7

10:22 pm-6:50 am

Nonstop5h 28m

Boston Logan Intl

Sat 3/21

7:05 am-10:45 am

Nonstop6h 40m

$307

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Fri 12/5

3:38 pm-11:59 pm

Nonstop5h 21m

Boston Logan Intl

Sun 12/7

7:00 am-10:35 am

Nonstop6h 35m

$307

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Fri 2/27

10:22 pm-6:50 am

Nonstop5h 28m

Boston Logan Intl

Sun 3/1

6:57 pm-10:25 pm

Nonstop6h 28m

$307

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Thu 2/12

10:50 pm-7:16 am

Nonstop5h 26m

Boston Logan Intl

Sun 2/15

5:55 pm-9:18 pm

Nonstop6h 23m

$307

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Wed 12/24

3:59 pm-12:23 am

Nonstop5h 24m

Boston Logan Intl

Tue 1/6

6:00 am-11:49 am

1 stop8h 49m

$317

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Thu 2/19

11:10 pm-3:47 pm

1 stop13h 37m

Boston Logan Intl

Sun 2/22

5:55 pm-9:18 pm

Nonstop6h 23m

$317

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

Wed 1/28

3:40 pm-11:54 pm

Nonstop5h 14m

Boston Logan Intl

Wed 2/4

5:20 pm-10:33 pm

1 stop8h 13m

$317

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/3

Showing 1-10 of 23 results
1
2
3

Compare providers for flights from Seattle to Boston

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 Seattle to Boston in November.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars
CheapOairPrice Accuracy3 starsTrust Score*3 stars
CheapflightsfaresPrice Accuracy3 starsTrust Score*2 stars
JustAirTicketPrice Accuracy-Trust Score*1 star
CheapTicketsDealPrice Accuracy3 starsTrust Score*3 stars
CheapfaremartPrice Accuracy-Trust Score*1 star

*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 Seattle-Boston flights, users find the pricing of CheapOair to be most consistent on Cheapflights vs. CheapOair Users can find the same prices on Seattle-Boston flight deals on Cheapflights vs. CheapOair >95% of the time. Price accuracy is based on data collected from Seattle-Boston flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Seattle-Boston flights, Cheapflights users trust CheapOair the most. CheapOair 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 Seattle-Boston 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 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 October 31, 2025.

Booking 27 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 $98). Flying from Seattle to Boston in August is currently the most expensive (average of $178). 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 November 4, 2025.

Unlike in the morning, when flights are generally more expensive, you can save up to 26% on flights from Seattle to Boston by exploring options for tickets at noon.

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 November 2, 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. Monday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

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

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 November 4, 2025.
Peruse reviews from past customers who have flown with Alaska Airlines, Delta, and Hawaiian Airlines 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.
Alaska Airlines
8.0
Very good
11,240 reviews

Food

7.1

Crew

8.5

Overall

8.0

Boarding

8.1

Entertainment

7.0

Comfort

7.8

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
Alaska Airlines
8.0
Very good
11,240 reviews
Alaska Airlines
8.0
Very good
11,240 reviews

Food

7.1

Crew

8.5

Overall

8.0

Boarding

8.1

Entertainment

7.0

Comfort

7.8

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
Delta
7.9
Good
8,002 reviews
Alaska Airlines
8.0
Very good
11,240 reviews

Food

7.1

Crew

8.5

Overall

8.0

Boarding

8.1

Entertainment

7.0

Comfort

7.8

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
Hawaiian Airlines
7.8
Good
2,799 reviews
Alaska Airlines
8.0
Very good
11,240 reviews

Food

7.1

Crew

8.5

Overall

8.0

Boarding

8.1

Entertainment

7.0

Comfort

7.8

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
American Airlines
7.2
Good
11,038 reviews
Alaska Airlines
8.0
Very good
11,240 reviews

Food

7.1

Crew

8.5

Overall

8.0

Boarding

8.1

Entertainment

7.0

Comfort

7.8

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
JetBlue
7.2
Good
2,907 reviews
Alaska Airlines
8.0
Very good
11,240 reviews

Food

7.1

Crew

8.5

Overall

8.0

Boarding

8.1

Entertainment

7.0

Comfort

7.8

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.

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 16 flights from Seattle/Tacoma Intl to Logan Intl, all of which are around 5h 18m for a nonstop flight. You can also purchase a plane ticket from 8 airlines when you book a flight from Seattle/Tacoma Intl to Boston.

  • How popular is this Seattle to Boston flight route?

    Within the past month, 23 users have taken a look at flights from Seattle/Tacoma Intl to Boston Logan Intl.

  • How long is the flight from Seattle to Boston?

    Airlines like Southwest, United Airlines, and Alaska Airlines fly from Seattle to Boston in about 5h 24m. The time it takes to get you to your destination can typically vary by up to 6h 36m. There are 2487 mi between Seattle and Boston. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

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

    Our cheapest airline available from Seattle to Boston is Hawaiian Airlines. Our recent data shows that you can find tickets from as low as $118 on this airline. Additional options worth looking into are JetBlue and Delta, starting at $133 and $149 round-trip. Hawaiian Airlines is currently priced 65% 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 Southwest. According to our data, you can fly for as low as $139. Users have also found prices from $146 and $154 on United Airlines and Delta, 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: LATAM Airlines (89%), Condor (86%), Scandinavian Airlines( 80%).

  • What are the cheapest flights from Seattle to Boston?

    Looking at all options, your cheapest flight can be booked for $118. While the most popular route (Seattle/Tacoma Intl - Boston Logan Intl) can be booked for $227 on average, our data indicates $829 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 $98). Flying from Seattle to Boston in August is currently the most expensive (average of $178). 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
Cambridge
Medford
Hampton Beach
Watertown
Seabrook
Seekonk
Lincoln
Lowell
Smithfield
Cranston
Chestnut Hill
Peabody
Quincy
York Beach
Warwick
Swansea
Old Orchard Beach
Brockton
Waltham
Chelsea

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Top 8 airlines flying from Seattle to Boston

Discover the top 8 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 November 4, 2025.
AirlineCheapestAverageFlexibilityOn-time
Hawaiian AirlinesCheapest$118Average$352FlexibilityNo cancel feeOn-time85%
JetBlueCheapest$133Average$326FlexibilityNo cancel feeOn-time62%
DeltaCheapest$149Average$373FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$178Average$340FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$196Average$355FlexibilityNo cancel feeOn-time71%
Sun Country AirCheapest$216Average$445FlexibilityNo cancel feeOn-time83%
Alaska AirlinesCheapest$226Average$453FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$281Average$340FlexibilityNo cancel feeOn-time63%

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