$99 Cheap Flights from Boston (BOS) to Seattle (SEA)

View $99 flight on Sat, May 2, 2026Opens in a new window

Popular airlines from Logan International Airport (BOS) to Seattle-Tacoma International Airport (SEA)

  • Be in the know

    Get alerts if flight prices drop or rise*

  • Book smarter

    Save up to 30% on select hotels after you book a flight*

  • Earn twice

    Earn your airline miles on top of our OneKeyCash
    Learn about One Key

Cheap Flights from Boston to Seattle (BOS-SEA)

Prices were available within the past 7 days and start at $99 for one-way flights and $192 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Southwest Airlines
Sat, Apr 25 - Tue, May 5
BOS
Boston
SEA
Seattle
$192 Roundtrip, found 1 hour ago
$192
Roundtrip
found 1 hour ago
Select Southwest Airlines flight, departing Sat, Apr 25 from Boston to Seattle, returning Tue, May 5, priced at $192 found 1 hour ago
Southwest Airlines
Tue, Apr 14 - Tue, Apr 21
BOS
Boston
SEA
Seattle
$197 Roundtrip, just found
$197
Roundtrip
just found
Select Southwest Airlines flight, departing Tue, Apr 14 from Boston to Seattle, returning Tue, Apr 21, priced at $197 just found
Alaska Airlines
Wed, Mar 25 - Tue, Mar 31
BOS
Boston
SEA
Seattle
$197 Roundtrip, just found
$197
Roundtrip
just found
Select Alaska Airlines flight, departing Wed, Mar 25 from Boston to Seattle, returning Tue, Mar 31, priced at $197 just found
JetBlue Airways
Tue, May 19 - Wed, May 20
BOS
Boston
SEA
Seattle
$197 Roundtrip, found 20 hours ago
$197
Roundtrip
found 20 hours ago
Select JetBlue Airways flight, departing Tue, May 19 from Boston to Seattle, returning Wed, May 20, priced at $197 found 20 hours ago
Southwest Airlines
Sat, May 9 - Tue, May 19
BOS
Boston
SEA
Seattle
$202 Roundtrip, found 1 hour ago
$202
Roundtrip
found 1 hour ago
Select Southwest Airlines flight, departing Sat, May 9 from Boston to Seattle, returning Tue, May 19, priced at $202 found 1 hour ago
Southwest Airlines
Wed, Mar 25 - Tue, Mar 31
BOS
Boston
SEA
Seattle
$207 Roundtrip, just found
$207
Roundtrip
just found
Select Southwest Airlines flight, departing Wed, Mar 25 from Boston to Seattle, returning Tue, Mar 31, priced at $207 just found
Alaska Airlines
Fri, Apr 3 - Tue, Apr 7
BOS
Boston
SEA
Seattle
$207 Roundtrip, just found
$207
Roundtrip
just found
Select Alaska Airlines flight, departing Fri, Apr 3 from Boston to Seattle, returning Tue, Apr 7, priced at $207 just found
Southwest Airlines
Sat, Apr 4 - Mon, Apr 13
BOS
Boston
SEA
Seattle
$208 Roundtrip, found 3 hours ago
$208
Roundtrip
found 3 hours ago
Select Southwest Airlines flight, departing Sat, Apr 4 from Boston to Seattle, returning Mon, Apr 13, priced at $208 found 3 hours ago
United
Sat, Apr 25 - Tue, May 5
BOS
Boston
SEA
Seattle
$212 Roundtrip, found 1 hour ago
$212
Roundtrip
found 1 hour ago
Select United flight, departing Sat, Apr 25 from Boston to Seattle, returning Tue, May 5, priced at $212 found 1 hour ago
American Airlines
Tue, Mar 31 - Wed, Apr 8
BOS
Boston
SEA
Seattle
$217 Roundtrip, found 5 hours ago
$217
Roundtrip
found 5 hours ago
Select American Airlines flight, departing Tue, Mar 31 from Boston to Seattle, returning Wed, Apr 8, priced at $217 found 5 hours ago

The Annual Vacation Sale

Members save up to 40% on hotels and homes. Plan this year’s big trip and save.
Book now

Find the cheapest month to fly from Boston (BOS) to Seattle (SEA)

March is typically the cheapest month to fly

From $156 - $307 per traveler.

Frequently asked questions

How much does a flight from Boston, MA (BOS-Logan Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.) cost?
You can find cheap one-way flights from $99 and cheap return flights from $192 Boston, MA (BOS-Logan Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.) with Expedia. One-way flights generally range between $153 and $1005, and roundtrip flights usually range from $266 to $1913. Flight prices vary based on the month and day of the week you want to travel, as well as the airline and how far in advance you book your ticket. Filter your search on Expedia by "Price (lowest to highest)" to see the cheapest fares first, and use the Price Tracking tool to receive alerts when Boston, MA (BOS-Logan Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.) ticket fares go up or down.*Typical price ranges based on flights available on Expedia in the last year. Prices include multi-airline options.
What is the cheapest month to fly from Boston, MA (BOS-Logan Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
September is the cheapest month to fly from Boston (BOS) to Seattle (SEA), with average return fares around $330. This price is about 16% lower than the average throughout the year, as September marks the end of the summer travel rush. Other affordable months to consider are January and February.*Averages based on flights available on Expedia in the last year.
Which airlines fly direct from Boston, MA (BOS-Logan Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
4 airlines operate nonstop service from BOS to SEA:

  • Delta operates around 21 direct flights from BOS to SEA every week
  • JetBlue Airways operates around 10 direct flights from BOS to SEA every week
  • Hawaiian Airlines operates around 19 direct flights from BOS to SEA every week
  • Japan Airlines operates around 7 direct flights from BOS to SEA every week

What is the cheapest airline that flies from Boston, MA (BOS-Logan Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
JetBlue Airways is one of the cheapest airlines offering nonstop flights from Boston, MA (BOS) to Seattle, WA (SEA) with round-trip tickets starting from around $243. Use Expedia's search tool to compare the prices and schedules of airlines that fly this route to find the best option for your plans and budget.*Prices based on flights available on Expedia in the last year.
How do I find cheap flights from Boston, MA (BOS-Logan Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
To find a cheap flight from Boston, MA (BOS-Logan Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up Price Tracking and receive alerts when fares go up or down.
What is the best airline to fly with from Boston, MA (BOS-Logan Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
The best airline to fly with from Boston, MA (BOS) to Seattle, WA (SEA) will differ from traveler to traveler. If you like to fly early, JetBlue Airways offers early morning flights. If price is the most important factor, JetBlue Airways typically offers the lowest fares. American Airlines offers the most daily flights from BOS to SEA, which is great if flexibility is what you value most. The best carrier for this journey could also be the one you have a loyalty membership with, as flying with that airline or another airline within the same alliance could help you collect points or enjoy lounge access.
What is the best time to fly from Boston, MA (BOS-Logan Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
When flying from Boston, MA (BOS) to Seattle, WA (SEA), the best months to travel are September and January. Average return flight prices are around $330, providing a budget-friendly option while allowing you to experience Seattle's vibrant culture and beautiful scenery.*Prices based on flights available on Expedia in the last year.
How many flights per day from Boston, MA (BOS-Logan Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
You can find approximately 4 nonstop flights per day from Logan Intl. (BOS) to Seattle - Tacoma Intl. (SEA). For more options, look at flights that include layovers.
What is the earliest flight from Boston, MA (BOS-Logan Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
The earliest flight from Logan International (BOS) to Seattle - Tacoma International (SEA) typically departs at around 5:00 AM, operated by American Airlines. This seasonal service is available in April, allowing you to maximize your time in Seattle. To compare early flights on Expedia, select the "Early Morning" and "Morning" filters in your search.
What are the most popular departure times for flights from Boston, MA (BOS-Logan Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
The most popular departure times for flights from Logan International Airport (BOS) to Seattle-Tacoma International Airport (SEA) are in the early morning, from 6am to 9am. About 32% of passengers prefer this time window. Many major carriers, including American Airlines and United Airlines, operate flights during this time. This timing is favored because it allows you to arrive in Seattle with a full day to explore.
How long does it take to fly from Boston, MA (BOS-Logan Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
Flying nonstop from BOS to SEA takes around 6 hours 30 minutes, with the route covering approximately 2,488 miles. Flights with a layover typically take 3 hours longer than direct options. Keep in mind that actual flight times can vary due to wind patterns, weather, and air traffic.
Can you fly business or first class from Boston, MA (BOS-Logan Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
Business class seats are offered on the BOS to SEA route with JetBlue Airways.First class cabins are available on:

  • United Airlines
  • American Airlines
  • Delta Air Lines

How much is a business class flight from Boston, MA (BOS-Logan Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
A direct, return business class ticket from Boston, MA (BOS) to Seattle, WA (SEA) typically costs between $1,777 - $2,495. A non-stop, one-way business class flight is usually around $716 - $1,181. Prices often fluctuate based on seasonality and how early you book. You may also be able to find a cheaper business class journey between Boston, MA (BOS-Logan Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.) if you opt for a connecting flight.*Prices based on flights available on Expedia in the last year.
How do I earn miles on a Boston, MA (BOS-Logan Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.) flight with Expedia?
It's easy to earn miles on a Boston, MA (BOS-Logan Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia.*Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.
What airports do you fly into for Seattle from Logan Intl. (BOS)?
From Logan Intl. (BOS), you can fly into Seattle - Tacoma Intl. (SEA) to reach Seattle. Some flights may connect through major hubs like Baltimore Washington Intl. Thurgood Marshall (BWI), Midway Intl. (MDW), Denver Intl. (DEN) before reaching Seattle. Compare routes and airports on Expedia to find the best flight options for your travel plans.
Is it cheaper to buy a plane ticket from Boston, MA (BOS-Logan Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.) at the last minute?
Typically, booking a last minute flight from Boston, MA (BOS-Logan Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare.
Is it cheaper to book a Boston, MA (BOS-Logan Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.) flight and hotel package?
Securing a Boston, MA (BOS-Logan Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.) Seattle Vacation Packages is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Boston, MA (BOS-Logan Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
If you booked your Boston, MA (BOS-Logan Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.

Travel information

Origin airport
Logan Intl.
Destination airport
Seattle - Tacoma Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, JetBlue Airways, Southwest Airlines, Sun Country Airlines, United
Roundtrip price
$191
Distance
2487 mi
Average flight time
4 hours 3 mins

Book with confidence

Boston to Seattle Flights

The cheapest times to fly from Boston to Seattle

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Boston to Seattle are during the month of April. You can find some of the cheapest flights from Boston to Seattle with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Boston to Seattle

Sunday is one of the best days to book for cheap flights from Boston to Seattle: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Boston to Seattle

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Boston to Seattle in 2026. You can also book with separate airlines for your outbound and return journeys, from $99 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Boston to Seattle flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Boston to Seattle airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Boston to Seattle Flights

*Flight schedules are subject to change.

Explore a world of travel with Expedia

*Available to One Key members.