$514 Cheap Alaska Airlines flights Seattle (SEA) to London (LHR)

View $514 flight on Sun, May 3, 2026Opens in a new window

$514 Cheap Alaska Airlines flights Seattle (SEA) to London (LHR)

Prices were available within the past 7 days and start at $514 for one-way flights and $858 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Alaska Airlines
Sun, May 3 - Fri, May 15
SEA
Seattle
LHR
London
$858 Roundtrip, found 11 hours ago
$858
Roundtrip
found 11 hours ago
Select Alaska Airlines flight, departing Sun, May 3 from Seattle to London, returning Fri, May 15, priced at $858 found 11 hours ago
Flights from Seattle (SEA) to London (LHR)
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
Finnair
Distance
7657 km
Average flight time
16 hours 38 mins