$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 6 days ago
$641
Roundtrip
found 6 days ago
Select Air Canada flight, departing Sat, Jan 17 from Seattle to London, returning Fri, Jan 30, priced at $641 found 6 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
Distance
7657 km
Average flight time
17 hours 38 mins