$109 Cheap Flights from Boston (BOS) to Seattle (SEA)

View $109 flight on Tue, Sep 16, 2025Opens in a new window

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

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Cheap Flights from Boston to Seattle (BOS-SEA)

Prices were available within the past 7 days and start at $109 for one-way flights and $211 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

JetBlue Airways
Wed, Oct 1 - Wed, Oct 1
BOS
Boston
SEA
Seattle
$211 Roundtrip, found 2 days ago
$211
Roundtrip
found 2 days ago
Select JetBlue Airways flight, departing Wed, Oct 1 from Boston to Seattle, returning Wed, Oct 1, priced at $211 found 2 days ago
Alaska Airlines
Sat, Sep 20 - Sat, Sep 20
BOS
Boston
SEA
Seattle
$211 Roundtrip, found 2 days ago
$211
Roundtrip
found 2 days ago
Select Alaska Airlines flight, departing Sat, Sep 20 from Boston to Seattle, returning Sat, Sep 20, priced at $211 found 2 days ago
Delta
Wed, Oct 1 - Wed, Oct 1
BOS
Boston
SEA
Seattle
$212 Roundtrip, found 1 day ago
$212
Roundtrip
found 1 day ago
Select Delta flight, departing Wed, Oct 1 from Boston to Seattle, returning Wed, Oct 1, priced at $212 found 1 day ago
Bargain Flight
Sat, Nov 15 - Wed, Dec 3
BOS
Boston
SEA
Seattle
$215 Roundtrip, found 21 hours ago
$215
Roundtrip
found 21 hours ago
Select Bargain Flight flight, departing Sat, Nov 15 from Boston to Seattle, returning Wed, Dec 3, priced at $215 found 21 hours ago
Alaska Airlines
Wed, Nov 5 - Wed, Nov 12
BOS
Boston
SEA
Seattle
$217 Roundtrip, just found
$217
Roundtrip
just found
Select Alaska Airlines flight, departing Wed, Nov 5 from Boston to Seattle, returning Wed, Nov 12, priced at $217 just found
Delta
Tue, Oct 28 - Wed, Nov 5
BOS
Boston
SEA
Seattle
$219 Roundtrip, found 2 hours ago
$219
Roundtrip
found 2 hours ago
Select Delta flight, departing Tue, Oct 28 from Boston to Seattle, returning Wed, Nov 5, priced at $219 found 2 hours ago
Delta
Tue, Aug 26 - Tue, Sep 9
BOS
Boston
SEA
Seattle
$221 Roundtrip, found 1 hour ago
$221
Roundtrip
found 1 hour ago
Select Delta flight, departing Tue, Aug 26 from Boston to Seattle, returning Tue, Sep 9, priced at $221 found 1 hour ago
Alaska Airlines
Wed, Dec 10 - Wed, Dec 10
BOS
Boston
SEA
Seattle
$221 Roundtrip, found 16 hours ago
$221
Roundtrip
found 16 hours ago
Select Alaska Airlines flight, departing Wed, Dec 10 from Boston to Seattle, returning Wed, Dec 10, priced at $221 found 16 hours ago
United
Tue, Sep 30 - Wed, Oct 8
BOS
Boston
SEA
Seattle
$223 Roundtrip, found 2 hours ago
$223
Roundtrip
found 2 hours ago
Select United flight, departing Tue, Sep 30 from Boston to Seattle, returning Wed, Oct 8, priced at $223 found 2 hours ago
United
Tue, Oct 28 - Wed, Nov 5
BOS
Boston
SEA
Seattle
$224 Roundtrip, found 2 hours ago
$224
Roundtrip
found 2 hours ago
Select United flight, departing Tue, Oct 28 from Boston to Seattle, returning Wed, Nov 5, priced at $224 found 2 hours ago

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

September is typically the cheapest month to fly

From $155 - $245 per traveler.

Graph displaying average flight prices per month

Alternative airports near Seattle

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Seattle - Tacoma Intl. SEA. Cheapest option available. Average driving time to city center is 20 minutes. Flights from $412
SEA
Seattle - Tacoma Intl.
Cheapest
Average driving time to city center20 min
Flights from $412
Flights from Boston (BOS) to Seattle (SEA)
Origin airport
Logan Intl.
Destination airport
Seattle - Tacoma Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Hawaiian Airlines, JetBlue Airways, Southwest Airlines, Sun Country Airlines, United
Roundtrip price
$211
Distance
2487 mi
Average flight time
3 hours 23 mins

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 October. 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 2025. You can also book with separate airlines for your outbound and return journeys, from $109 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.

 

Frequently asked questions

How much does a flight from Logan Intl. Airport (BOS) to Seattle - Tacoma Intl. Airport (SEA) cost?
You can score cheap return flights from Logan Intl. Airport (BOS) to Seattle - Tacoma Intl. Airport (SEA) starting from $210. Book your seat and get ready for takeoff. This information is based on the cheapest price found on Expedia for this return journey departing within the next three months. This airfare is for a Alaska Airlines flight leaving BOS on August 19 2025 and touching down at SEA. The price was last updated on July 23 2025 and has not changed since.
What is the cheapest month to fly from BOS to SEA?
The cheapest flights from BOS to SEA are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
Which airlines fly direct from Logan Intl. Airport (BOS) to Seattle - Tacoma Intl. Airport (SEA)?
Select from 3 carriers that operate direct flights from Logan Intl. Airport (BOS) to Seattle - Tacoma Intl. Airport (SEA). These include:

  • Delta Air Lines
  • Alaska Airlines
  • JetBlue Airways

What is the cheapest airline that flies from BOS to SEA?
Currently, the cheapest carrier operating one-way flights from BOS to SEA is JetBlue Airways. You can jet off on this route from $106. This fare is based on the lowest price found on Expedia departing within the next three months. The flight takes off from BOS on October 15 2025. Prices were last updated on July 23 2025 and have not changed since.
How many flights per day from Logan Intl. Airport (BOS) to Seattle - Tacoma Intl. Airport (SEA)?
Each day on average, 4 nonstop flights operate from Logan Intl. Airport (BOS) to Seattle - Tacoma Intl. Airport (SEA). Choose the departure time that fits your schedule best.
What are the most popular departure times for flights from Logan Intl. Airport (BOS) to Seattle - Tacoma Intl. Airport (SEA)?
More people fly between BOS and SEA at 7 PM than at any other point in the day. Looking to skip the crowds? Travel outside of rush hours and you could save on your ticket as well.
What day of the week has the most flights from BOS to SEA?
Depart on a Friday if you're after the best choice of flights from Logan Intl. Airport (BOS) to Seattle - Tacoma Intl. Airport (SEA).
What is the earliest flight from Logan Intl. Airport (BOS) to Seattle - Tacoma Intl. Airport (SEA)?
Logan Intl. Airport (BOS)'s earliest flight to Seattle - Tacoma Intl. Airport (SEA) departs at approximately 7:00AM UTC-5. With a total travel time of 6h 38m, you'll arrive at around 10:38AM UTC-8.
How long does it take to fly from Logan Intl. Airport (BOS) to Seattle - Tacoma Intl. Airport (SEA)?
Flights from BOS to SEA have an average travel time of 6 hours and 26 minutes. The distance between the two is 2,500 mi.
What airline has the least delays from BOS to SEA?
Consider booking with American Airlines if you'd like to go straight from Logan Intl. Airport (BOS) to Seattle - Tacoma Intl. Airport (SEA) without any holdups. This carrier has the best track record for punctuality, with an on-time score of 100%. Want to get notified of any changes? You can keep an eye on your flight status using the Expedia App.
What is the best time to fly from Logan Intl. Airport (BOS) to Seattle - Tacoma Intl. Airport (SEA)?
To arrive at Seattle - Tacoma Intl. Airport (SEA) on time, book a flight that leaves Logan Intl. Airport (BOS) before 3 PM. The likelihood of cancellations is 22% higher, on average, for departures after this hour.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
What airports do you fly into for Seattle from Logan Intl. Airport (BOS)?
Seattle - Tacoma Intl. Airport (SEA) is the only airport in Seattle with direct flights from Logan Intl. Airport (BOS). Explore your options and discover affordable fares on Expedia.
Is it cheaper to buy a plane ticket from Logan Intl. Airport (BOS) to Seattle - Tacoma Intl. Airport (SEA) last-minute?
Waiting until right before your break to book a flight from BOS to SEA often results in higher prices. While you might find some last-minute discounts, there's no guarantee. Allow some flexibility in your schedule to maximize your chances of scoring a bargain.
Is it cheaper to book a BOS to SEA flight and hotel package?
You'll typically save money by securing a BOS to SEA flight and hotel package compared to booking separately. In fact, travelers could save hundreds of dollars by bundling with Expedia. And it's simple to manage everything in one place. After selecting your preferred flights and accommodations, you can add extras such as tours, car rentals and activities.
Can I cancel or change the date of my flight from Logan Intl. Airport (BOS) to Seattle - Tacoma Intl. Airport (SEA)?
If you reserved your BOS to SEA flight within the last 24 hours, you may be able to modify or cancel it without fees. Depending on the airline and the type of fare you purchased, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, visit our Customer Service portal for more details.

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