NZ$443 Cheap Flights Seattle to London (SEA-LHR)

View NZ$443 flight on Wed, 18 Mar 2026Opens in a new window

Popular airlines from Seattle-Tacoma International Airport (SEA) to Heathrow Airport (LHR)

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Cheap Flights from Seattle (SEA) to London (LHR)

Prices were available within the past 7 days for one-way flights and round trip tickets for the period specified. Prices and availability are subject to change. Additional terms apply.

Virgin Atlantic
Sun, 2 Nov - Tue, 18 Nov
SEA
Seattle
LHR
London
NZ$1,045 Return, found 6 hours ago
NZ$1,045
Return
found 6 hours ago
Select Virgin Atlantic flight, departing Sun, 2 Nov from Seattle to London, returning Tue, 18 Nov, priced at NZ$1,045 found 6 hours ago
Icelandair
Wed, 18 Mar - Tue, 24 Mar
SEA
Seattle
LHR
London
NZ$1,065 Return, found 6 hours ago
NZ$1,065
Return
found 6 hours ago
Select Icelandair flight, departing Wed, 18 Mar from Seattle to London, returning Tue, 24 Mar, priced at NZ$1,065 found 6 hours ago
Lufthansa
Wed, 18 Mar - Tue, 24 Mar
SEA
Seattle
LHR
London
NZ$1,090 Return, found 6 hours ago
NZ$1,090
Return
found 6 hours ago
Select Lufthansa flight, departing Wed, 18 Mar from Seattle to London, returning Tue, 24 Mar, priced at NZ$1,090 found 6 hours ago
Virgin Atlantic
Sun, 2 Nov - Tue, 18 Nov
SEA
Seattle
LHR
London
NZ$1,093 Return, found 6 hours ago
NZ$1,093
Return
found 6 hours ago
Select Virgin Atlantic flight, departing Sun, 2 Nov from Seattle to London, returning Tue, 18 Nov, priced at NZ$1,093 found 6 hours ago
United
Sun, 2 Nov - Tue, 18 Nov
SEA
Seattle
LHR
London
NZ$1,093 Return, found 6 hours ago
NZ$1,093
Return
found 6 hours ago
Select United flight, departing Sun, 2 Nov from Seattle to London, returning Tue, 18 Nov, priced at NZ$1,093 found 6 hours ago
Virgin Atlantic
Sun, 2 Nov - Tue, 18 Nov
SEA
Seattle
LHR
London
NZ$1,093 Return, found 6 hours ago
NZ$1,093
Return
found 6 hours ago
Select Virgin Atlantic flight, departing Sun, 2 Nov from Seattle to London, returning Tue, 18 Nov, priced at NZ$1,093 found 6 hours ago
Air Canada
Sun, 2 Nov - Tue, 18 Nov
SEA
Seattle
LHR
London
NZ$1,093 Return, found 6 hours ago
NZ$1,093
Return
found 6 hours ago
Select Air Canada flight, departing Sun, 2 Nov from Seattle to London, returning Tue, 18 Nov, priced at NZ$1,093 found 6 hours ago
KLM
Wed, 18 Mar - Tue, 24 Mar
SEA
Seattle
LHR
London
NZ$1,148 Return, found 6 hours ago
NZ$1,148
Return
found 6 hours ago
Select KLM flight, departing Wed, 18 Mar from Seattle to London, returning Tue, 24 Mar, priced at NZ$1,148 found 6 hours ago
British Airways
Sun, 2 Nov - Tue, 18 Nov
SEA
Seattle
LHR
London
NZ$1,205 Return, found 6 hours ago
NZ$1,205
Return
found 6 hours ago
Select British Airways flight, departing Sun, 2 Nov from Seattle to London, returning Tue, 18 Nov, priced at NZ$1,205 found 6 hours ago
Delta
Wed, 18 Mar - Tue, 24 Mar
SEA
Seattle
LHR
London
NZ$1,231 Return, found 6 hours ago
NZ$1,231
Return
found 6 hours ago
Select Delta flight, departing Wed, 18 Mar from Seattle to London, returning Tue, 24 Mar, priced at NZ$1,231 found 6 hours ago
Flight from Seattle to London route information
Origin airport
Seattle - Tacoma Intl.
Destination airport
Heathrow
Airlines serving
Aer Lingus, Air Canada, Air France, American Airlines, Austrian Airlines, British Airways, Brussels Airlines, Delta, Finnair, Icelandair, KLM, Lufthansa, Singapore Airlines, Turkish Airlines, United, Virgin Atlantic
Return price
NZ$1,044
Distance
7657 km
Average flight time
17 hours 33 mins

Perfect flights from Seattle to London

Embark on an unforgettable journey without breaking the bank with Expedia's incredible deals on cheap flights from Seattle to London. Whether you're aching for a romantic escape with your partner, craving an adventurous solo expedition, or yearning to immerse yourself in the local history and culture, we've got you covered.
 
Picture yourself strolling through the streets of , surrounded by breathtaking architecture and absorbing the vibrant atmosphere of this captivating city. Indulge in the mouth-watering local specialties, from tantalizing street food to exquisite fine dining. With Expedia, you can experience all of this and more, without sacrificing your budget.
 
Our flexible Seattle - Tacoma Intl. to Heathrow ticket options cater to your travel preferences, with incredible one-way fares from NZ$443 and roundtrip prices from NZ$1,045. Whether you're planning a short city break or a longer adventure, our dynamic pricing ensures that you find the best deals for your journey.
 
But the magic doesn't stop there. Expedia offers a range of partner services to enhance your trip. Rent a car at Heathrow and explore and its surrounding areas at your own pace. Discover hidden gems off the beaten path, and create unforgettable memories. We also provide a handpicked selection of accommodations, from charming bed and breakfasts to luxury hotels, ensuring that you have a comfortable and memorable stay.
 
Planning your next great adventure is a breeze with Expedia. Our user-friendly platform, unbeatable prices, and round-the-clock customer support are designed to make your travel experience seamless and stress-free. So, why wait? Book your to travel arrangements today and embark on the journey of a lifetime in London.

Frequently asked questions

How much is a flight from Sea-Tac Airport to Heathrow Airport (LHR)?
If you're travelling between SEA and London Heathrow, round-trip journeys start from NZ$1,045. This price is based on fares listed within the last 7 days on Expedia for flights departing within the next year, so don't delay. Book today and save yourself money and time. Prices and availability are subject to change. Additional terms apply.
Do I need to pay a cancellation fee if I cancel my flight from SEA to Heathrow Airport?
The majority of flights can be cancelled online, but whether you are charged a fee all comes down to your airline. If you do need to cancel your trip, follow the instructions in the Customer Service Portal.
How do I find cheap flights from Seattle - Tacoma Intl. Airport (SEA) to LHR that have flexible change policies?
Many airlines offer the option to reschedule your flight without a change fee. All you pay is the difference between the original flight and the new flight. When you're searching for Seattle - Tacoma Intl. Airport (SEA) to London Heathrow flights, you'll see a "no change fees" filter for you to select.
How far is the flight from Seattle - Tacoma Intl. Airport (SEA) to Heathrow Airport?
With a flight distance of 7 700 kilometres between Sea-Tac Airport and Heathrow Airport (LHR), this is a long trip. Be sure to drink plenty of water and go for a short walk down the aisle every now and then.
Which airlines fly direct from SEA to Heathrow Airport (LHR)?
It's easy to fly directly from Sea-Tac Airport to Heathrow Airport. Below are the most sought-after carriers that offer nonstop services on this route:

  • Virgin Atlantic - (VS) with 30 monthly flights
  • American Airlines - (AA) with 30 monthly flights
  • British Airways - (BA) with 30 monthly flights
  • Delta Air Lines - (DL) with 17 monthly flights

Are SEA to LHR flight tickets cheaper when they're purchased at the last minute?
Flight prices are constantly going up and down, so there are no guarantees. While last-minute deals between Seattle - Tacoma Intl. Airport (SEA) and Heathrow Airport are of course possible, it's also a good idea to keep track of prices well before you fly. In fact, some airlines announce their prices up to a year prior to the departure date. Expedia is constantly updating the best bargains around, so keep checking back and be ready to lock in your seat when the price dips.

Explore a world of travel with Expedia

London Flight Deals

London

Seattle to Gatwick
NZ$949.80
*Available to Expedia members.