$399 Cheap United flights Seattle (SEA) to London (LHR)

$399 Cheap United flights Seattle (SEA) to London (LHR)

Prices were available within the past 7 days and start at $399 for one-way flights and $518 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Mon, Oct 6 - Thu, Oct 16

SEA

Seattle

LHR

London

$518 Roundtrip, found 3 days ago

$518

Roundtrip

found 3 days ago

Select United flight, departing Mon, Oct 6 from Seattle to London, returning Thu, Oct 16, priced at $518 found 3 days ago

Mon, Oct 6 - Thu, Oct 16

SEA

Seattle

LHR

London

$526 Roundtrip, found 3 days ago

$526

Roundtrip

found 3 days ago

Select United flight, departing Mon, Oct 6 from Seattle to London, returning Thu, Oct 16, priced at $526 found 3 days ago