Cheap Delta flights Seattle (SEA) to London (LHR)

You can discover affordable round-trip Delta Air Lines flights from $608 from SEA to LHR by sorting your results from “Price (lowest to highest)” on Expedia. Or look for deals for a one-way journey.**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.

Browse for round-trip or one-way flights to London in January or February. You could find a cheap fare with Delta Air Lines during these quieter months.

Landing the best Delta Air Lines deals from SEA to LHR is typically all about timing. You can save 17% on international flights when you book 18 to 29 days before takeoff instead of four to five months ahead. What’s more, you can pocket 17% on average by buying your tickets on a Sunday rather than a Friday, which is often the most expensive day to book.* It’s a good idea to start checking out flights about one month before you want to travel.*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.

Use the “Nonstop” filter when browsing for direct Delta Air Lines flights from SEA to LHR. You can also compare other carriers offering the same nonstop journey.

From takeoff to arrival, a nonstop Delta Air Lines flight from Seattle - Tacoma Intl. Airport (SEA) to Heathrow Airport (LHR) typically takes 9h 35m.

The earliest flight from SEA to LHR with Delta Air Lines departs at 7:05PM UTC-8. You’ll land at 12:40PM UTC+0. The last Delta Air Lines flight of the day leaves at 7:05PM UTC-8 and arrives at 12:40PM UTC+0. With around 20% fewer cancellations for morning departures, setting off early is generally the wisest option.**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.

Jump on a Delta Air Lines flight from Seattle - Tacoma Intl. Airport (SEA) to London, and you’ll most likely land at Heathrow Airport (LHR). This is the airline’s primary hub in this destination.

Taking off from SEA to LHR with Delta Air Lines comes with plenty of perks, such as a rewarding loyalty program and an excellent in-flight experience. Plus, when booking through Expedia, One Key™ members can earn OneKeyCash™* to use on select future travel purchases. That’s on top of the Delta SkyMiles points you can earn with Delta Air Lines.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.

Most likely, you’ll be flying on an Airbus A330-900neo for your Delta Air Lines flight from Seattle - Tacoma Intl. Airport (SEA) to Heathrow Airport (LHR). However, you may be switched to a different aircraft for operational reasons.

It’s generally possible to modify or cancel your flight, although additional charges may apply if you made your booking over 24 hours ago. Prefer to keep your options open? Use Expedia’s “Changes included” and “No cancel fee” filters to find flights that won’t charge you extra if you have to alter your plans. To modify your booking, head to “Trips,” select your flight and click on “Manage Booking” for more information.