$629 Cheap United flights Seattle (SEA) to London (LHR)

View $629 flight on Sun, May 3, 2026Opens in a new window

$629 Cheap United flights Seattle (SEA) to London (LHR)

Prices were available within the past 7 days and start at $629 for one-way flights and $885 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Sun, May 3 - Tue, May 19
SEA
Seattle
LHR
London
$885 Roundtrip, found 3 days ago
$885
Roundtrip
found 3 days ago
Select United flight, departing Sun, May 3 from Seattle to London, returning Tue, May 19, priced at $885 found 3 days ago
United
Tue, May 5 - Tue, May 19
SEA
Seattle
LHR
London
$889 Roundtrip, found 3 days ago
$889
Roundtrip
found 3 days ago
Select United flight, departing Tue, May 5 from Seattle to London, returning Tue, May 19, priced at $889 found 3 days ago
United
Sun, May 3 - Fri, May 15
SEA
Seattle
LHR
London
$891 Roundtrip, found 12 hours ago
$891
Roundtrip
found 12 hours ago
Select United flight, departing Sun, May 3 from Seattle to London, returning Fri, May 15, priced at $891 found 12 hours ago
United
Thu, Apr 30 - Fri, May 15
SEA
Seattle
LHR
London
$898 Roundtrip, found 3 days ago
$898
Roundtrip
found 3 days ago
Select United flight, departing Thu, Apr 30 from Seattle to London, returning Fri, May 15, priced at $898 found 3 days ago
United
Sun, May 3 - Fri, May 15
SEA
Seattle
LHR
London
$903 Roundtrip, found 12 hours ago
$903
Roundtrip
found 12 hours ago
Select United flight, departing Sun, May 3 from Seattle to London, returning Fri, May 15, priced at $903 found 12 hours ago
United
Sun, May 3 - Fri, May 15
SEA
Seattle
LHR
London
$914 Roundtrip, found 12 hours ago
$914
Roundtrip
found 12 hours ago
Select United flight, departing Sun, May 3 from Seattle to London, returning Fri, May 15, priced at $914 found 12 hours ago
United
Wed, May 13 - Wed, May 27
SEA
Seattle
LHR
London
$919 Roundtrip, found 3 days ago
$919
Roundtrip
found 3 days ago
Select United flight, departing Wed, May 13 from Seattle to London, returning Wed, May 27, priced at $919 found 3 days ago
United
Thu, Apr 30 - Tue, May 19
SEA
Seattle
LHR
London
$935 Roundtrip, found 3 days ago
$935
Roundtrip
found 3 days ago
Select United flight, departing Thu, Apr 30 from Seattle to London, returning Tue, May 19, priced at $935 found 3 days ago

Alternative airports near London

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Heathrow LHR. Cheapest option available. Average driving time to city center is 28 minutes. Flights from $953
LHR
Heathrow
Cheapest
Average driving time to city center28 min
Flights from $953

Find the cheapest month to fly from Seattle (SEA) to London (LHR)

April is typically the cheapest month to fly

From $590 - $1,107 per traveler.

Travel information

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, JetBlue Airways, KLM, Lufthansa, Swiss International Air Lines, Turkish Airlines, United, Virgin Atlantic, WestJet
Popular airline
Delta
Distance
7657 km
Average flight time
17 hours 35 mins

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