$109 Cheap Delta flights Boston (BOS) to Seattle (SEA)

Make use of the “Price (lowest to highest)” filter on Expedia to find cheap Delta Air Lines round-trip flights from $217 from BOS to SEA. Affordable one-way options from $109 are available as well.**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.

Search for one-way or return flights to Seattle in January or February. You could find lower fares with Delta Air Lines during these off-peak travel months.

Begin your search one to three months ahead of your travel date to find cheap fares on Delta Air Lines flights from Logan Intl. Airport (BOS) to Seattle - Tacoma Intl. Airport (SEA). You can save 25% by booking your domestic flight 34 to 86 days in advance compared to last-minute reservations made 6 to 12 days out. You could also reduce costs by buying your fare on a Sunday, as it’s 6% cheaper on average than a Monday, the most expensive day to book.* Get your timing right, and you can enjoy significant savings on domestic journeys.*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.

Delta Air Lines operates direct flights from Logan Intl. Airport (BOS) to Seattle - Tacoma Intl. Airport (SEA), with 14 departures every week. Simply apply the “Nonstop” and “Airline” filters while searching on Expedia to find all direct Delta Air Lines flights to SEA.

From wheels-up to touchdown, a direct Delta Air Lines flight from Logan Intl. Airport (BOS) to Seattle - Tacoma Intl. Airport (SEA) typically takes 6h 25m.

Delta Air Lines operates the most flights from Logan Intl. Airport (BOS) to Seattle - Tacoma Intl. Airport (SEA) on Thursday. With up to 2 daily departures, you’ll get the most flexibility on this day.

Leaving BOS at 7:10AM UTC-5, the earliest Delta Air Lines flight to SEA lands at 10:45AM UTC-8. Flying earlier in the day means you’ll be less likely to experience delays.* Prefer a later start? The last Delta Air Lines flight from BOS to SEA departs at 7:05PM UTC-5 and touches down at 10:25PM UTC-8.*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.

Delta Air Lines flights from Logan Intl. Airport (BOS) to Seattle touch down at Seattle - Tacoma Intl. Airport (SEA). This is the main entry point to this destination.

Delta Air Lines makes traveling from BOS to SEA enjoyable with an excellent in-flight experience and a rewarding loyalty program. You even have the chance to collect points with Delta SkyMiles. Be sure to sign up to Expedia’s free One Key™ rewards program to earn OneKeyCash™*, which can be redeemed on future travel.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.

Delta Air Lines typically uses Airbus A321neo planes for flights from Logan Intl. Airport (BOS) to Seattle - Tacoma Intl. Airport (SEA). Bear in mind that aircraft type can change depending on operational requirements, so the plane you catch might be different on your day of travel.

Depending on your fare type, a fee is typically charged if you cancel or reschedule your booking more than 24 hours after it has been confirmed. To find flexible plane tickets, select our “Changes included” or “No cancel fee” filter when searching for flights. To learn more about canceling or modifying your reservation, visit “Trips,” select your flight and click on “Manage Booking.”