Cheap flights from Seattle to Great Britain

View AU$410 flight on Tue, 21 Oct. 2025Opens in a new window

Popular airlines from Seattle to Great Britain

  • American Airlines

    American Airlines

  • Air Canada

    Air Canada

  • British Airways

    British Airways

  • Delta

    Delta

  • Aer Lingus

    Aer Lingus

  • KLM

    KLM

  • Swiss International Air Lines

    Swiss International Air Lines

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Cheap Flights from Seattle (SEA) to Great Britain (LON)

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.

Aer Lingus
Tue, 9 Sep. - Tue, 16 Sep.
SEA
Seattle
LHR
London
AU$734 Return, found 5 hours ago
AU$734
Return
found 5 hours ago
Select Aer Lingus flight, departing Tue, 9 Sep. from Seattle to London, returning Tue, 16 Sep., priced at AU$734 found 5 hours ago
Delta
Wed, 6 Aug. - Wed, 13 Aug.
SEA
Seattle
LHR
London
AU$774 Return, found 4 hours ago
AU$774
Return
found 4 hours ago
Select Delta flight, departing Wed, 6 Aug. from Seattle to London, returning Wed, 13 Aug., priced at AU$774 found 4 hours ago
United
Tue, 9 Sep. - Tue, 16 Sep.
SEA
Seattle
LHR
London
AU$783 Return, found 5 hours ago
AU$783
Return
found 5 hours ago
Select United flight, departing Tue, 9 Sep. from Seattle to London, returning Tue, 16 Sep., priced at AU$783 found 5 hours ago
Air Canada
Tue, 9 Sep. - Tue, 16 Sep.
SEA
Seattle
LHR
London
AU$783 Return, found 5 hours ago
AU$783
Return
found 5 hours ago
Select Air Canada flight, departing Tue, 9 Sep. from Seattle to London, returning Tue, 16 Sep., priced at AU$783 found 5 hours ago
Delta
Wed, 6 Aug. - Wed, 13 Aug.
SEA
Seattle
LHR
London
AU$784 Return, found 4 hours ago
AU$784
Return
found 4 hours ago
Select Delta flight, departing Wed, 6 Aug. from Seattle to London, returning Wed, 13 Aug., priced at AU$784 found 4 hours ago
Virgin Atlantic
Wed, 6 Aug. - Wed, 13 Aug.
SEA
Seattle
LHR
London
AU$784 Return, found 4 hours ago
AU$784
Return
found 4 hours ago
Select Virgin Atlantic flight, departing Wed, 6 Aug. from Seattle to London, returning Wed, 13 Aug., priced at AU$784 found 4 hours ago

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

October is typically the cheapest month to fly

From AU$737 - AU$1,330 per traveller.

Graph displaying average flight prices per month

*Available to Expedia members.