$401 Cheap Air Canada flights Seattle (SEA) to London (LHR)

View $401 flight on Wed, May 6, 2026Opens in a new window

$401 Cheap Air Canada flights Seattle (SEA) to London (LHR)

Prices were available within the past 7 days and start at $401 for one-way flights and $641 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Air Canada
Sat, Jan 17 - Fri, Jan 30
SEA
Seattle
LHR
London
$641 Roundtrip, found 5 days ago
$641
Roundtrip
found 5 days ago
Select Air Canada flight, departing Sat, Jan 17 from Seattle to London, returning Fri, Jan 30, priced at $641 found 5 days ago

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

October is typically the cheapest month to fly

From $477 - $843 per traveler.
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, Turkish Airlines, United, Virgin Atlantic, WestJet
Popular airline
KLM
Distance
7657 km
Average flight time
17 hours 34 mins