Book United London to Seattle flight deals from $378

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Downtown Seattle at sunset

Plan ahead for flights from London to Seattle

from
to
Type
Dates
Price*
London (LHR)
to Seattle (SEA)
Roundtrip
Depart Fri 5 Oct 2018
Return Thu 11 Oct 2018
from$ 378*Viewed: 3 days ago
London (LHR)
to Seattle (SEA)
Roundtrip
Depart Tue 9 Oct 2018
Return Tue 16 Oct 2018
from$ 458*Viewed: 2 days ago
London (LHR)
to Seattle (SEA)
Roundtrip
Depart Tue 2 Oct 2018
Return Tue 9 Oct 2018
from$ 459*Viewed: 1 day ago
London (LHR)
to Seattle (SEA)
Roundtrip
Depart Wed 3 Oct 2018
Return Wed 10 Oct 2018
from$ 463*Viewed: 1 day ago
London (LHR)
to Seattle (SEA)
Roundtrip
Depart Thu 30 Aug 2018
Return Fri 7 Sep 2018
from$ 497*Viewed: 10 hours ago
London (LHR)
to Seattle (SEA)
Roundtrip
Depart Fri 12 Apr 2019
Return Sat 20 Apr 2019
from$ 691*Viewed: 7 hours ago
*Prices have been available for round trips within the last 48 hours and may not be currently available. Fares listed may be Basic Economy, which is our most restrictive fare option and subject to additional restrictions. Additional baggage charges and fees for other optional service may apply. Other terms and conditions may apply.

Weather in Seattle

76 °FSunday08/19/2018
78 °FMonday08/20/2018
80 °FTuesday08/21/2018
74 °FWednesday08/22/2018
62 °FThursday08/23/2018
58 °FFriday08/24/2018
57 °FSaturday08/25/2018
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