Cheap Flights From Seattle - Tacoma Intl. (SEA) To Heathrow (LHR)

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

The cheapest flights to Heathrow found within the past 7 days were CA $753 round trip and CA $468 one way. Prices and availability subject to change. Additional terms may apply.

Mon, Mar 9 - Fri, Mar 13
SEA
Seattle
LHR
London
CA $753 Roundtrip, found 1 day ago
CA $753
Roundtrip
found 1 day ago
Select Icelandair flight, departing Mon, Mar 9 from Seattle to London, returning Fri, Mar 13, priced at CA $753 found 1 day ago
Sun, Mar 15 - Wed, Mar 25
SEA
Seattle
LHR
London
CA $834 Roundtrip, found 3 days ago
CA $834
Roundtrip
found 3 days ago
Select Aer Lingus flight, departing Sun, Mar 15 from Seattle to London, returning Wed, Mar 25, priced at CA $834 found 3 days ago
Wed, Mar 25 - Mon, Apr 13
SEA
Seattle
LHR
London
CA $859 Roundtrip, found 1 day ago
CA $859
Roundtrip
found 1 day ago
Select Virgin Atlantic flight, departing Wed, Mar 25 from Seattle to London, returning Mon, Apr 13, priced at CA $859 found 1 day ago
Sat, May 9 - Wed, May 20
SEA
Seattle
LHR
London
CA $866 Roundtrip, found 6 days ago
CA $866
Roundtrip
found 6 days ago
Select Delta flight, departing Sat, May 9 from Seattle to London, returning Wed, May 20, priced at CA $866 found 6 days ago
Sun, Aug 16 - Thu, Aug 20
SEA
Seattle
LHR
London
CA $872 Roundtrip, found 2 days ago
CA $872
Roundtrip
found 2 days ago
Select Scandinavian Airlines flight, departing Sun, Aug 16 from Seattle to London, returning Thu, Aug 20, priced at CA $872 found 2 days ago
Wed, Jul 29 - Wed, Sep 2
SEA
Seattle
LHR
London
CA $872 Roundtrip, found 1 day ago
CA $872
Roundtrip
found 1 day ago
Select Lufthansa flight, departing Wed, Jul 29 from Seattle to London, returning Wed, Sep 2, priced at CA $872 found 1 day ago
Tue, Feb 17 - Fri, Feb 27
SEA
Seattle
LHR
London
CA $877 Roundtrip, found 2 days ago
CA $877
Roundtrip
found 2 days ago
Select Air Canada flight, departing Tue, Feb 17 from Seattle to London, returning Fri, Feb 27, priced at CA $877 found 2 days ago
Tue, Mar 10 - Tue, Mar 17
SEA
Seattle
LHR
London
CA $884 Roundtrip, found 4 days ago
CA $884
Roundtrip
found 4 days ago
Select British Airways flight, departing Tue, Mar 10 from Seattle to London, returning Tue, Mar 17, priced at CA $884 found 4 days ago
Wed, Sep 16 - Wed, Sep 30
SEA
Seattle
LHR
London
CA $898 Roundtrip, found 1 day ago
CA $898
Roundtrip
found 1 day ago
Select Alaska Airlines flight, departing Wed, Sep 16 from Seattle to London, returning Wed, Sep 30, priced at CA $898 found 1 day ago
Sat, Aug 15 - Sun, Aug 30
SEA
Seattle
LHR
London
CA $1,010 Roundtrip, found 2 days ago
CA $1,010
Roundtrip
found 2 days ago
Select Swiss International Air Lines flight, departing Sat, Aug 15 from Seattle to London, returning Sun, Aug 30, priced at CA $1,010 found 2 days ago

Frequently asked questions

Are there direct flights from Seattle - Tacoma Intl. Airport (SEA) to Heathrow Airport (LHR)?
Sometimes, travel is all about the journey; sometimes the magic is in the destination. But if you just want to get to where you're headed fast, multiple airlines have direct flights from Seattle - Tacoma Intl. Airport (SEA) to LHR, including Virgin Atlantic and American Airlines.
What airlines fly from Sea-Tac Airport to London Heathrow?
With a few airlines operating direct flights from Sea-Tac Airport to LHR, you shouldn't have a problem finding that perfect fare. Below are some of the most reliable air carriers:

  • Virgin Atlantic - (VS) with 30 flights every month
  • American Airlines - (AA) with 30 flights every month
  • British Airways - (BA) with 30 flights every month
  • Delta - (DL) with 4 flights every month

What is the best day to buy a plane ticket?
Airfares offered on Friday tend to be the cheapest, according to flight demand on Travelocity.ca in 2021. Purchasing your airfares on a Thursday or Saturday can also provide better value, however our advice if you're looking to save money is to avoid booking on a Wednesday or Sunday. Our data shows that those two days have the highest ticket values on average, so keep this in mind if you're browsing flight deals.
What are the cheapest days to fly?
Frequent travellers may already know this, but earlier in the week is often the cheapest time to fly. Flights departing on a Monday are the cheapest of the week. Since flights towards the middle of the week tend to be more popular, this causes the prices to rise. This is why, on average, airfares booked on Travelocity.ca in 2021 were most expensive for Wednesday departures.
How far in advance can you book a flight?
Here's the deal: It is typically possible to start comparing international airfares on Travelocity.ca up to 12 months in advance. However, it does depend on the carrier as not all airlines release their prices that far out. According to our 2021 flight demand trends, last minute planners can still bag a bargain with some of the cheapest fares appearing 2-4 weeks prior to their travel dates.*According to flight demand on Travelocity.ca from January to December 2021. Savings are subject to change and may vary depending on selections made.

Popular Flight Routes from Seattle (SEA)

Travelers at SEA love to visit these top cities. Roam to the top destinations from Seattle (SEA) today with the cheap prices from Travelocity!

Popular Flight Routes from London (LHR)

Travelers at LHR love to visit these top cities. Roam to the top destinations from London(LHR) today with the cheap prices from Travelocity!

*Price based on the lowest price found within past 24 hours and based upon one night stay for two adults over the next thirty days. Prices and availability subject to change. Additional terms may apply.