$129 Cheap Delta flights Seattle (SEA) to Boston (BOS)

View $129 flight on Wed, Jan 28, 2026Opens in a new window
  • notification illustration

    Be in the know

    Get alerts if flight prices drop or rise*
  • deals illustration

    Book smarter

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

    Earn twice

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

Today's featured flight deals from Seattle-Tacoma International Airport (SEA) to Logan International Airport (BOS)

Nonstop
Carry-on included
Lower price than typical

$129 Cheap Delta flights Seattle (SEA) to Boston (BOS)

Prices were available within the past 7 days and start at $129 for one-way flights and $261 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Sat, Feb 14 - Mon, Feb 16
SEA
Seattle
BOS
Boston
$261 Roundtrip, just found
$261
Roundtrip
just found
Select Delta flight, departing Sat, Feb 14 from Seattle to Boston, returning Mon, Feb 16, priced at $261 just found
Delta
Thu, Jan 29 - Sun, Feb 1
SEA
Seattle
BOS
Boston
$267 Roundtrip, just found
$267
Roundtrip
just found
Select Delta flight, departing Thu, Jan 29 from Seattle to Boston, returning Sun, Feb 1, priced at $267 just found
Delta
Thu, Feb 5 - Sat, Feb 7
SEA
Seattle
BOS
Boston
$276 Roundtrip, just found
$276
Roundtrip
just found
Select Delta flight, departing Thu, Feb 5 from Seattle to Boston, returning Sat, Feb 7, priced at $276 just found
Delta
Thu, Jan 22 - Sat, Jan 24
SEA
Seattle
BOS
Boston
$281 Roundtrip, just found
$281
Roundtrip
just found
Select Delta flight, departing Thu, Jan 22 from Seattle to Boston, returning Sat, Jan 24, priced at $281 just found
Delta
Thu, Feb 5 - Sat, Feb 7
SEA
Seattle
BOS
Boston
$286 Roundtrip, just found
$286
Roundtrip
just found
Select Delta flight, departing Thu, Feb 5 from Seattle to Boston, returning Sat, Feb 7, priced at $286 just found

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

March is typically the cheapest month to fly

From $157 - $307 per traveler.
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, Sun Country Airlines, United
Popular airline
Alaska Airlines
Distance
2487 mi
Average flight time
8 hours 57 mins

Frequently asked questions

How much is a Delta Air Lines flight from Seattle - Tacoma Intl. Airport (SEA) to Logan Intl. Airport (BOS)?
Set the "Price (lowest to highest)" filter on Expedia to look for cheap Delta Air Lines return flights from $261 from SEA to BOS. Affordable one-way fares from $129 are also available.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.
What is the cheapest month to fly from SEA to BOS with Delta Air Lines?
Delta Air Lines flights to Boston tend to be more affordable in the quieter months of January and February. Whether you're after a round-trip or one-way ticket, you could find a better deal then.
What is the cheapest time to book flights from Seattle - Tacoma Intl. Airport (SEA) to Logan Intl. Airport (BOS) with Delta Air Lines?
Search for affordable Delta Air Lines flights from Seattle - Tacoma Intl. Airport (SEA) to Logan Intl. Airport (BOS) one to three months before your departure day. Travelers who book domestic flights 34 to 86 days in advance can save 25% compared to those who book just 6 to 12 days ahead. Regardless of fare type and journey, the ideal day to book a domestic flight is usually Sunday and the most expensive is typically Monday. Passengers who book on a Sunday can save 6% on average compared to those who book on a Monday.**Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC's global airline sales database.
Does Delta Air Lines fly nonstop from Seattle - Tacoma Intl. Airport (SEA) to Logan Intl. Airport (BOS)?
Depart on one of Delta Air Lines's 14 direct weekly flights from Seattle - Tacoma Intl. Airport (SEA) to Logan Intl. Airport (BOS). To see your options, enter your destination, origin and dates and hit search. Then apply the "Nonstop" and "Airline" filters.
How long does it take to fly from SEA to BOS with Delta Air Lines?
Take off from Seattle - Tacoma Intl. Airport (SEA) for Logan Intl. Airport (BOS) on a direct Delta Air Lines flight, and you'll be in the air for around 5h 27m.
Which day of the week has the most Delta Air Lines flights from Seattle - Tacoma Intl. Airport (SEA) to Logan Intl. Airport (BOS)?
If you're looking for flexibility, Thursday offers the most choice for Delta Air Lines flights from Seattle - Tacoma Intl. Airport (SEA) to Logan Intl. Airport (BOS). You can select from 2 different departures.
What is the earliest Delta Air Lines flight from SEA to BOS?
Setting off from SEA at 7:30AM UTC-8, the earliest Delta Air Lines flight to BOS lands at 3:59PM UTC-5. Traveling early means you're less likely to encounter delays.* Prefer to travel later? The last Delta Air Lines flight from SEA to BOS departs at 10:29PM UTC-8 and touches down at 6:55AM UTC-5.*Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
What airports does Delta Air Lines fly into in Boston?
Hop on a Delta Air Lines flight from Seattle - Tacoma Intl. Airport (SEA) to Boston, and you're most likely to land at Logan Intl. Airport (BOS). This is the airline's primary hub in this destination.
Why fly with Delta Air Lines from SEA to BOS?
Delta Air Lines makes traveling from SEA to BOS more enjoyable with an excellent in-flight experience and a rewarding loyalty program. You also have the chance to earn points with Delta SkyMiles. Don't forget to join Expedia's free One Key™ rewards program to earn OneKeyCash™*, which can be redeemed on future bookings.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.
What type of plane does Delta Air Lines fly from Seattle - Tacoma Intl. Airport (SEA) to Logan Intl. Airport (BOS)?
Delta Air Lines typically uses Airbus A321neo planes for flights from Seattle - Tacoma Intl. Airport (SEA) to Logan Intl. Airport (BOS). Remember that aircraft type can differ depending on operational needs, so the plane you'll be on might be different on your day of travel.
Can I change or cancel my Delta Air Lines flight from Seattle - Tacoma Intl. Airport (SEA) to Logan Intl. Airport (BOS)?
It's generally possible to modify or cancel your flight, although additional fees may apply if you booked over 24 hours ago. Want to keep your options open? Make use of our "Changes included" or "No cancel fee" filter to find flights that won't penalize you if you need to alter your plans. To make modifications, go to "Trips," select your flight and click on "Manage Booking" for more details.

Explore a world of travel with Expedia

*Available to One Key members.