$414 Cheap Delta flights Seattle (SEA) to London (LHR)

View $414 flight on Sun, Oct 12, 2025Opens in a new window

$414 Cheap Delta flights Seattle (SEA) to London (LHR)

Prices were available within the past 7 days and start at $414 for one-way flights and $476 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Mon, Aug 18 - Mon, Aug 25
SEA
Seattle
LHR
London
$476 Roundtrip, found 12 hours ago
$476
Roundtrip
found 12 hours ago
Select Delta flight, departing Mon, Aug 18 from Seattle to London, returning Mon, Aug 25, priced at $476 found 12 hours ago
Delta
Sat, Aug 9 - Sat, Aug 16
SEA
Seattle
LHR
London
$498 Roundtrip, found 1 hour ago
$498
Roundtrip
found 1 hour ago
Select Delta flight, departing Sat, Aug 9 from Seattle to London, returning Sat, Aug 16, priced at $498 found 1 hour ago
Delta
Mon, Sep 8 - Thu, Sep 18
SEA
Seattle
LHR
London
$505 Roundtrip, found 2 hours ago
$505
Roundtrip
found 2 hours ago
Select Delta flight, departing Mon, Sep 8 from Seattle to London, returning Thu, Sep 18, priced at $505 found 2 hours ago
Delta
Wed, Sep 24 - Wed, Oct 1
SEA
Seattle
LHR
London
$508 Roundtrip, found 5 hours ago
$508
Roundtrip
found 5 hours ago
Select Delta flight, departing Wed, Sep 24 from Seattle to London, returning Wed, Oct 1, priced at $508 found 5 hours ago
Delta
Mon, Sep 8 - Thu, Sep 18
SEA
Seattle
LHR
London
$510 Roundtrip, found 2 hours ago
$510
Roundtrip
found 2 hours ago
Select Delta flight, departing Mon, Sep 8 from Seattle to London, returning Thu, Sep 18, priced at $510 found 2 hours ago
Flights from Seattle (SEA) to London (LHR)
Origin airport
Seattle - Tacoma Intl.
Destination airport
Heathrow
Airlines serving
Aer Lingus, Air Canada, Air France, Alaska Airlines, American Airlines, Austrian Airlines, British Airways, Brussels Airlines, Delta, Finnair, Iberia, Icelandair, JetBlue Airways, KLM, Lufthansa, Scandinavian Airlines, Turkish Airlines, United, Virgin Atlantic, WestJet
Popular airline
British Airways
Distance
4786 mi
Average flight time
17 hours 33 mins

Frequently asked questions

How much is a Delta Air Lines flight from Seattle - Tacoma Intl. Airport (SEA) to Heathrow Airport (LHR)?
You can discover affordable round-trip Delta Air Lines flights from $476 from SEA to LHR by sorting your results from "Price (lowest to highest)" on Expedia. Or look for deals from $414 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.
What is the cheapest month to fly from SEA to LHR with Delta Air Lines?
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.
What is the cheapest time to book flights from Seattle - Tacoma Intl. Airport (SEA) to Heathrow Airport (LHR) with Delta Air Lines?
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.
Does Delta Air Lines fly nonstop from Seattle - Tacoma Intl. Airport (SEA) to Heathrow Airport (LHR)?
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.
How long does it take to fly from SEA to LHR with Delta Air Lines?
From takeoff to arrival, a nonstop Delta Air Lines flight from Seattle - Tacoma Intl. Airport (SEA) to Heathrow Airport (LHR) typically takes 9h 35m.
What is the earliest Delta Air Lines flight from SEA to LHR?
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.
What airports does Delta Air Lines fly into in London?
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.
Why fly with Delta Air Lines from SEA to LHR?
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.
What type of plane does Delta Air Lines fly from Seattle - Tacoma Intl. Airport (SEA) to Heathrow Airport (LHR)?
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.
Can I change or cancel my Delta Air Lines flight from Seattle - Tacoma Intl. Airport (SEA) to Heathrow Airport (LHR)?
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.

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*Available to One Key members.