Cheap Flights from Seattle (SEA) to London (LHR) from HK$3,402~

    Plan, book, fly with confidence
  • trending down icon
    Be in the know
    Get alerts if flight prices drop or rise*
  • bex rewards loyalty icon
    Book smarter
    Save up to 35% on select hotels after you book a flight*
  • payments icon
    Earn twice
    Earn your airline miles on top of our rewards
    Sign in

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

Prices were available within the past 7 days and start at HK$3,402 for one-way flights and HK$5,277 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Sunday, 25 Aug - Tuesday, 3 Sep
SEA
Seattle
LHR
London
HK$5,277 Return, found 5 days ago
HK$5,277
Return
found 5 days ago
Select United flight, departing Sunday, 25 Aug from Seattle to London, returning Tuesday, 3 Sep, priced at HK$5,277 found 5 days ago
Virgin Atlantic
Sunday, 25 Aug - Wednesday, 4 Sep
SEA
Seattle
LHR
London
HK$5,281 Return, found 5 days ago
HK$5,281
Return
found 5 days ago
Select Virgin Atlantic flight, departing Sunday, 25 Aug from Seattle to London, returning Wednesday, 4 Sep, priced at HK$5,281 found 5 days ago
Air Canada
Saturday, 24 Aug - Tuesday, 3 Sep
SEA
Seattle
LHR
London
HK$5,491 Return, found 5 days ago
HK$5,491
Return
found 5 days ago
Select Air Canada flight, departing Saturday, 24 Aug from Seattle to London, returning Tuesday, 3 Sep, priced at HK$5,491 found 5 days ago
Virgin Atlantic
Sunday, 25 Aug - Monday, 2 Sep
SEA
Seattle
LHR
London
HK$5,671 Return, found 5 days ago
HK$5,671
Return
found 5 days ago
Select Virgin Atlantic flight, departing Sunday, 25 Aug from Seattle to London, returning Monday, 2 Sep, priced at HK$5,671 found 5 days ago
Virgin Atlantic
Saturday, 24 Aug - Saturday, 31 Aug
SEA
Seattle
LHR
London
HK$6,061 Return, found 5 days ago
HK$6,061
Return
found 5 days ago
Select Virgin Atlantic flight, departing Saturday, 24 Aug from Seattle to London, returning Saturday, 31 Aug, priced at HK$6,061 found 5 days ago
Delta
Wednesday, 28 Aug - Wednesday, 4 Sep
SEA
Seattle
LHR
London
HK$6,718 Return, found 5 days ago
HK$6,718
Return
found 5 days ago
Select Delta flight, departing Wednesday, 28 Aug from Seattle to London, returning Wednesday, 4 Sep, priced at HK$6,718 found 5 days ago
Delta
Monday, 26 Aug - Monday, 2 Sep
SEA
Seattle
LHR
London
HK$6,731 Return, found 5 days ago
HK$6,731
Return
found 5 days ago
Select Delta flight, departing Monday, 26 Aug from Seattle to London, returning Monday, 2 Sep, priced at HK$6,731 found 5 days ago
Virgin Atlantic
Wednesday, 28 Aug - Tuesday, 3 Sep
SEA
Seattle
LHR
London
HK$7,108 Return, found 5 days ago
HK$7,108
Return
found 5 days ago
Select Virgin Atlantic flight, departing Wednesday, 28 Aug from Seattle to London, returning Tuesday, 3 Sep, priced at HK$7,108 found 5 days ago
United
Wednesday, 28 Aug - Sunday, 1 Sep
SEA
Seattle
LHR
London
HK$7,541 Return, found 5 days ago
HK$7,541
Return
found 5 days ago
Select United flight, departing Wednesday, 28 Aug from Seattle to London, returning Sunday, 1 Sep, priced at HK$7,541 found 5 days ago
KLM
Sunday, 7 Jul - Tuesday, 23 Jul
SEA
Seattle
LHR
London
HK$7,672 Return, found 4 days ago
HK$7,672
Return
found 4 days ago
Select KLM flight, departing Sunday, 7 Jul from Seattle to London, returning Tuesday, 23 Jul, priced at HK$7,672 found 4 days ago
Seattle to London route information
Origin airport
Seattle - Tacoma Intl.
Destination airport
Heathrow
Airlines serving
Air Canada, Air France, American Airlines, British Airways, Delta, Finnair, KLM, Lufthansa, Turkish Airlines, United, Virgin Atlantic, WestJet
Return price
HK$5,277
Distance
7657 km

Flights from Seattle to London

Book cheap flights from Seattle (SEA) to London (LHR) on Expedia.com.hk. Find the best flight deals to destinations around the world for your next leisure or business travel on Expedia.com.hk.

Search for flights from Seattle (SEA) to London (LHR) to find great flight deals suitable to your travel date and time. Expedia.com.hk flight booking search engine is simple to use and looking for cheap flights is as easy as a click of a mouse or on your mobile devices.

Be assured that you’re seeing the best price guaranteed! Our friendly customer service representatives are here to serve you 24 hours day to provide assistance and answer any questions that you may have about booking your Seattle (SEA) to London (LHR) trip. Call us at 3077-4857 (direct number - 24 hours day for English).

Save more when combine your London flight with a hotel for a package deal! Discover additional savings by booking in advance. Now you can find activities in London and things to do in London for your perfect vacation with Expedia Thing to Do.

If you would like to book flights to London more flexibly, many prefer to purchase one-way tickets with options to take different airlines. A one way ticket to London is HK$3,402 now!

 

Frequently asked questions

How much is a flight from Sea-Tac Airport to Heathrow Airport (LHR)?
If you’re traveling between SEA and London Heathrow, round-trip journeys start from HK$5,277. 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 canceled 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 kilometers 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.
*Available to Expedia members.