$440 Cheap KLM flights Seattle (SEA) to London (LHR)

View $440 flight on Sun, May 3, 2026Opens in a new window

$440 Cheap KLM flights Seattle (SEA) to London (LHR)

Prices were available within the past 7 days and start at $440 for one-way flights and $682 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

KLM
Sun, May 3 - Fri, May 15
SEA
Seattle
LHR
London
$682 Roundtrip, found 16 hours ago
$682
Roundtrip
found 16 hours ago
Select KLM flight, departing Sun, May 3 from Seattle to London, returning Fri, May 15, priced at $682 found 16 hours ago
KLM
Sun, May 3 - Fri, May 15
SEA
Seattle
LHR
London
$684 Roundtrip, found 16 hours ago
$684
Roundtrip
found 16 hours ago
Select KLM flight, departing Sun, May 3 from Seattle to London, returning Fri, May 15, priced at $684 found 16 hours ago

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, Iberia, Icelandair, JetBlue Airways, KLM, Lufthansa, United, Virgin Atlantic, WestJet
Popular airline
Aer Lingus
Distance
7657 km
Average flight time
16 hours 38 mins

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