$124 Cheap Flights from Seattle (SEA) to Boston (BOS)

View $124 flight on Sat, May 24, 2025Opens in a new window

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

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Find available prices by choosing your travel dates.

Cheap Flights from Seattle to Boston (SEA-BOS)

Prices were available within the past 7 days and start at $124 for one-way flights and $237 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Sat, Sep 13 - Tue, Sep 16
SEA
Seattle
BOS
Boston
$237 Roundtrip, just found
$237
Roundtrip
just found
Select Delta flight, departing Sat, Sep 13 from Seattle to Boston, returning Tue, Sep 16, priced at $237 just found
Bargain Flight
Sat, May 24 - Wed, May 28
SEA
Seattle
BOS
Boston
$246 Roundtrip, found 2 hours ago
$246
Roundtrip
found 2 hours ago
Select Bargain Flight flight, departing Sat, May 24 from Seattle to Boston, returning Wed, May 28, priced at $246 found 2 hours ago
Bargain Flight
Mon, May 19 - Thu, May 29
SEA
Seattle
BOS
Boston
$247 Roundtrip, found 1 hour ago
$247
Roundtrip
found 1 hour ago
Select Bargain Flight flight, departing Mon, May 19 from Seattle to Boston, returning Thu, May 29, priced at $247 found 1 hour ago
Hawaiian Airlines
Sun, May 18 - Sat, May 24
SEA
Seattle
BOS
Boston
$247 Roundtrip, found 3 hours ago
$247
Roundtrip
found 3 hours ago
Select Hawaiian Airlines flight, departing Sun, May 18 from Seattle to Boston, returning Sat, May 24, priced at $247 found 3 hours ago
JetBlue Airways
Sat, May 10 - Thu, May 15
SEA
Seattle
BOS
Boston
$247 Roundtrip, just found
$247
Roundtrip
just found
Select JetBlue Airways flight, departing Sat, May 10 from Seattle to Boston, returning Thu, May 15, priced at $247 just found
Delta
Mon, May 19 - Thu, May 29
SEA
Seattle
BOS
Boston
$249 Roundtrip, found 1 hour ago
$249
Roundtrip
found 1 hour ago
Select Delta flight, departing Mon, May 19 from Seattle to Boston, returning Thu, May 29, priced at $249 found 1 hour ago
Alaska Airlines
Mon, Jun 2 - Tue, Jun 3
SEA
Seattle
BOS
Boston
$251 Roundtrip, just found
$251
Roundtrip
just found
Select Alaska Airlines flight, departing Mon, Jun 2 from Seattle to Boston, returning Tue, Jun 3, priced at $251 just found
JetBlue Airways
Wed, May 21 - Sat, May 31
SEA
Seattle
BOS
Boston
$253 Roundtrip, found 5 hours ago
$253
Roundtrip
found 5 hours ago
Select JetBlue Airways flight, departing Wed, May 21 from Seattle to Boston, returning Sat, May 31, priced at $253 found 5 hours ago
Bargain Flight
Fri, May 30 - Fri, Jun 6
SEA
Seattle
BOS
Boston
$254 Roundtrip, found 5 hours ago
$254
Roundtrip
found 5 hours ago
Select Bargain Flight flight, departing Fri, May 30 from Seattle to Boston, returning Fri, Jun 6, priced at $254 found 5 hours ago
Bargain Flight
Sun, May 18 - Sat, May 31
SEA
Seattle
BOS
Boston
$256 Roundtrip, found 1 day ago
$256
Roundtrip
found 1 day ago
Select Bargain Flight flight, departing Sun, May 18 from Seattle to Boston, returning Sat, May 31, priced at $256 found 1 day ago
Flights from Seattle (SEA) to Boston (BOS)
Origin airport
Seattle - Tacoma Intl.
Destination airport
Logan Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, JetBlue Airways, Southwest Airlines, Spirit Airlines, Sun Country Airlines, United
Roundtrip price
$237
Distance
2487 mi

Seattle to Boston Flights

The cheapest times to fly from Seattle to Boston

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 Seattle to Boston are during the month of September. You can find some of the cheapest flights from Seattle to Boston with Expedia's search tool and vast selection of airlines.

The best time to book a flight from Seattle to Boston

Sunday is one of the best days to book for cheap flights from Seattle to Boston: 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 Seattle to Boston

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 Seattle to Boston in 2025. You can also book with separate airlines for your outbound and return journeys, from $124 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 Seattle to Boston 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 Seattle to Boston 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 Seattle - Tacoma Intl. Airport (SEA) to Logan Intl. Airport (BOS) cost?
You can book cheap return fares starting from $244 from Seattle - Tacoma Intl. Airport (SEA) to Logan Intl. Airport (BOS). 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 SEA on May 19 2025 and touching down at BOS. The price was last updated on April 24 2025 and has not changed since.
What is the cheapest month to fly from SEA to BOS?
The cheapest flights from SEA to BOS 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 Seattle - Tacoma Intl. Airport (SEA) to Logan Intl. Airport (BOS)?
Select from 3 airlines that fly directly from Seattle - Tacoma Intl. Airport (SEA) to Logan Intl. Airport (BOS). These include:

  • Delta Air Lines
  • Alaska Airlines
  • JetBlue Airways

What is the cheapest airline that flies from SEA to BOS?
With prices as low as $120 for a one-way flight from SEA to BOS, JetBlue Airways is currently the cheapest carrier operating this route. This fare is based on the lowest price found on Expedia departing within the next three months. The flight takes off from SEA on June 4 2025. Prices were last updated on April 24 2025 and have not changed since.
How many flights per day from Seattle - Tacoma Intl. Airport (SEA) to Logan Intl. Airport (BOS)?
With, on average, 4 nonstop flights that operate from Seattle - Tacoma Intl. Airport (SEA) to Logan Intl. Airport (BOS) every day, you’ll be on your way in no time.
What are the most popular departure times for flights from Seattle - Tacoma Intl. Airport (SEA) to Logan Intl. Airport (BOS)?
The 3 PM departures from SEA to BOS are the top choice for many travelers. These flights can come with a higher price due to their popularity. If you want to save money, pick a less crowded time to fly.
What day of the week has the most flights from SEA to BOS?
Friday offers the most flights from Seattle - Tacoma Intl. Airport (SEA) to Logan Intl. Airport (BOS). Consider jetting off on this day and you’ll have a greater chance of finding a departure that works with your plans.
What is the earliest flight from Seattle - Tacoma Intl. Airport (SEA) to Logan Intl. Airport (BOS)?
Hop on the earliest flight at around 7:30AM UTC-8, departing from Seattle - Tacoma Intl. Airport (SEA). You’ll be traveling for about 5h 29m, arriving at Logan Intl. Airport (BOS) at approximately 3:59PM UTC-5.
How long does it take to fly from Seattle - Tacoma Intl. Airport (SEA) to Logan Intl. Airport (BOS)?
The average flight time from SEA to BOS is 5 hours and 22 minutes, covering a distance of 2,500 mi.
What airline has the least delays from SEA to BOS?
Delta Air Lines has the best performance for on-time direct flights from Seattle - Tacoma Intl. Airport (SEA) to Logan Intl. Airport (BOS), with an on-time score of 84%. Use the Expedia App to see your flight schedule before you leave and get notified of any trip changes.
What is the best time to fly from Seattle - Tacoma Intl. Airport (SEA) to Logan Intl. Airport (BOS)?
To avoid potential delays on the Seattle - Tacoma Intl. Airport (SEA) to Logan Intl. Airport (BOS) route, fly before 3 PM. Later flights have a 22% higher chance of cancellation.**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 Boston from Seattle - Tacoma Intl. Airport (SEA)?
Check out your flight options from Seattle - Tacoma Intl. Airport (SEA) to Logan Intl. Airport (BOS). This is the only Boston airport you can land at if you’re taking a direct flight.
Is it cheaper to buy a plane ticket from Seattle - Tacoma Intl. Airport (SEA) to Logan Intl. Airport (BOS) last-minute?
Booking your ticket from SEA to BOS right before your getaway is usually more expensive. But if there’s some wiggle room with your itinerary, you could score a cheap last-minute fare.
Is it cheaper to book a SEA to BOS flight and hotel package?
Opting for a SEA to BOS flight and hotel package is generally cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your trip all in one place. Choose from our impressive range of hotels and then add car rentals, flights and activities to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Seattle - Tacoma Intl. Airport (SEA) to Logan Intl. Airport (BOS)?
Typically, you can reschedule or cancel your SEA to BOS flight. However, there may be additional fees, especially if you made your booking over 24 hours ago. Double-check your itinerary for the airline’s rules and fees on flight changes, or if you need more information, visit our Customer Service portal.

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*Available to One Key members.