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$159+ 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 1/23. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BOS
ene. 8 — ene. 151
jue. 1/8
jue. 1/15
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 80 days in advance, depart on a Wednesday or Tuesday and return on a Wednesday

Cheap 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 diciembre 9, 2025.

This Alaska Airlines deal was found by Cheapflights users on 12/7. 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.
mié. 12/313:59 pmSEA - BOS
Nonstop5h 24mAlaska Airlines
mié. 1/77:00 amBOS - SEA
Nonstop6h 34mAlaska Airlines
Deal found 12/7$307
This Alaska Airlines deal was found by Cheapflights users on 12/9. 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.
mié. 12/313:59 pmSEA - BOS
Nonstop5h 24mAlaska Airlines
mar. 1/64:45 pmBOS - SEA
1 stop10h 56mAlaska Airlines
Deal found 12/9$317
This United Airlines deal was found by Cheapflights users on 12/8. 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.
jue. 12/2512:37 pmSEA - BOS
1 stop7h 58mUnited Airlines
mar. 1/207:55 amBOS - SEA
1 stop10h 49mUnited Airlines
Deal found 12/8$322
This Delta deal was found by Cheapflights users on 12/7. 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.
mié. 12/313:55 pmSEA - BOS
1 stop14h 14mDelta
mar. 1/65:20 pmBOS - SEA
Nonstop6h 24mDelta
Deal found 12/7$355
This Kiwi.com deal was found by Cheapflights users on 12/9. 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.
lun. 12/296:26 pmSEA - BOS
1 stop13h 25mSun Country Air
jue. 1/111:49 amBOS - SEA
1 stop8h 23mSun Country Air
Deal found 12/9$357
This Kiwi.com deal was found by Cheapflights users on 12/9. 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.
mar. 12/2311:52 amSEA - BOS
1 stop19h 59mSun Country Air
mar. 12/3011:49 amBOS - SEA
1 stop8h 35mSun Country Air
Deal found 12/9$371
This United Airlines deal was found by Cheapflights users on 12/7. 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.
vie. 12/265:02 amSEA - BOS
1 stop7h 33mUnited Airlines
mar. 1/62:20 pmBOS - SEA
1 stop9h 37mUnited Airlines
Deal found 12/7$376
This United Airlines deal was found by Cheapflights users on 12/9. 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.
mié. 12/179:25 amSEA - BOS
1 stop9h 18mUnited Airlines
lun. 3/24:15 pmBOS - SEA
1 stop9h 28mUnited Airlines
Deal found 12/9$377
This Alaska Airlines deal was found by Cheapflights users on 12/7. 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.
mié. 12/313:59 pmSEA - BOS
Nonstop5h 24mAlaska Airlines
lun. 1/55:12 pmBOS - SEA
1 stop9h 03mAlaska Airlines
Deal found 12/7$383

Find 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 diciembre 9, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$286
(SmartFares)

One-way from

$159
(United Airlines)

Popular in

December

Cheapest in

January

Average price

$536

Good round-trip deal

$357 or less

Good one-way deal

$205 or less
Provider with most accurate pricing for Seattle/Tacoma Intl-Boston Logan Intl flight deals.
Search Deals
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
Search Deals
One-way flight from Seattle/Tacoma Intl to Boston Logan Intl
Search Deals
Highest demand for flights based on searches. 7% potential increase in price ($29 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($17 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals
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.
Search Deals

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 diciembre 9, 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

mié. 1/14

10:25 pm-6:50 am

Nonstop5h 25m

Boston Logan Intl

mié. 1/21

7:15 am-10:45 am

Nonstop6h 30m

$307

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

lun. 5/11

11:30 am-8:05 pm

Nonstop5h 35m

Boston Logan Intl

vie. 5/15

7:00 am-10:20 am

Nonstop6h 20m

$307

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

sáb. 3/7

10:20 pm-6:48 am

Nonstop5h 28m

Boston Logan Intl

sáb. 3/21

9:33 am-1:00 pm

Nonstop6h 27m

$307

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

mié. 5/13

11:30 am-8:05 pm

Nonstop5h 35m

Boston Logan Intl

sáb. 5/16

7:00 am-10:20 am

Nonstop6h 20m

$307

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

vie. 5/1

3:55 pm-12:23 am

Nonstop5h 28m

Boston Logan Intl

sáb. 5/2

9:33 am-1:00 pm

Nonstop6h 27m

$307

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

mar. 1/6

10:25 pm-6:50 am

Nonstop5h 25m

Boston Logan Intl

mar. 1/13

7:15 am-10:45 am

Nonstop6h 30m

$307

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

vie. 1/9

10:25 pm-6:53 am

Nonstop5h 28m

Boston Logan Intl

lun. 1/19

6:45 pm-10:13 pm

Nonstop6h 28m

$307

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

jue. 1/8

7:40 am-4:09 pm

Nonstop5h 29m

Boston Logan Intl

mié. 1/14

7:30 am-7:34 pm

1 stop15h 04m

$316

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

mié. 1/7

3:40 pm-11:54 pm

Nonstop5h 14m

Boston Logan Intl

mié. 1/14

5:20 pm-10:33 pm

1 stop8h 13m

$317

SeattleBoston

SEA - BOS

SEABOS

Seattle/Tacoma Intl

jue. 5/28

3:40 pm-12:06 am

Nonstop5h 26m

Boston Logan Intl

lun. 6/1

4:49 pm-11:57 pm

1 stop10h 08m

$317

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/7

Showing 1-10 of 22 results
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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 December.
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 December 5, 2025.

Booking 80 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 December is currently the most expensive (average of $222). 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 diciembre 9, 2025.

Unlike in the morning, when flights are generally more expensive, you can save up to 38% 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 December 6, 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

AI-powered summary based on content written by travel experts. AI can make mistakes.
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 diciembre 9, 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
11,420 reviews

Entertainment

7.0

Crew

8.5

Comfort

7.8

Overall

8.0

Food

7.1

Boarding

8.1

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
11,420 reviews
Alaska Airlines
8.0
Very good
11,420 reviews

Entertainment

7.0

Crew

8.5

Comfort

7.8

Overall

8.0

Food

7.1

Boarding

8.1

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
8,011 reviews
Alaska Airlines
8.0
Very good
11,420 reviews

Entertainment

7.0

Crew

8.5

Comfort

7.8

Overall

8.0

Food

7.1

Boarding

8.1

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
2,818 reviews
Alaska Airlines
8.0
Very good
11,420 reviews

Entertainment

7.0

Crew

8.5

Comfort

7.8

Overall

8.0

Food

7.1

Boarding

8.1

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
11,043 reviews
Alaska Airlines
8.0
Very good
11,420 reviews

Entertainment

7.0

Crew

8.5

Comfort

7.8

Overall

8.0

Food

7.1

Boarding

8.1

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
2,899 reviews
Alaska Airlines
8.0
Very good
11,420 reviews

Entertainment

7.0

Crew

8.5

Comfort

7.8

Overall

8.0

Food

7.1

Boarding

8.1

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 18 flights from Seattle/Tacoma Intl to Logan Intl, all of which are around 5h 14m 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, 22 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 Delta and JetBlue fly from Seattle to Boston in about 5h 25m. The time it takes to get you to your destination is usually consistent. There are 2487 mi between Seattle and Boston. Most flights are nonstop.

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

    Our cheapest airline available from Seattle to Boston is JetBlue. Our recent data shows that you can find tickets from as low as $118 on this airline. Additional options worth looking into are Hawaiian Airlines and Delta, starting at $118 and $129 round-trip. JetBlue is currently priced 66% 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 American Airlines. According to our data, you can fly for as low as $98. Users have also found prices from $108 and $115 on JetBlue 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: TAP AIR PORTUGAL (100%), EL AL (91%), Condor( 88%).

  • What are the cheapest flights from Seattle to Boston?

    Looking at all options, your cheapest flight can be booked for $153. While the most popular route (Seattle/Tacoma Intl - Boston Logan Intl) can be booked for $257 on average, our data indicates $1,020 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 December is currently the most expensive (average of $222). 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
Cranston
Lincoln
Lowell
Smithfield
Peabody
Brockton
Quincy
York Beach
Warwick
Londonderry
Swansea
Old Orchard Beach
Waltham
Chelsea

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Alternative routes for Seattle to Boston

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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 diciembre 9, 2025.
AirlineCheapestAverageFlexibilityOn-time
Hawaiian AirlinesCheapest$118Average$352FlexibilityNo cancel feeOn-time85%
JetBlueCheapest$141Average$327FlexibilityNo cancel feeOn-time62%
DeltaCheapest$160Average$379FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$178Average$361FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$196Average$381FlexibilityNo cancel feeOn-time71%
Sun Country AirCheapest$223Average$381FlexibilityNo cancel feeOn-time83%
Alaska AirlinesCheapest$233Average$457FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$236Average$335FlexibilityNo cancel feeOn-time63%

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