$422 Cheap KLM flights San Francisco (SFO) to London (LHR)

View $422 flight on Wed, Jan 21, 2026Opens in a new window

$422 Cheap KLM flights San Francisco (SFO) to London (LHR)

Prices were available within the past 7 days and start at $422 for one-way flights and $671 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

KLM
Sat, Mar 7 - Mon, Mar 16
SFO
San Francisco
LHR
London
$671 Roundtrip, found 5 hours ago
$671
Roundtrip
found 5 hours ago
Select KLM flight, departing Sat, Mar 7 from San Francisco to London, returning Mon, Mar 16, priced at $671 found 5 hours ago

Find the cheapest month to fly from San Francisco (SFO) to London (LHR)

February is typically the cheapest month to fly

From $446 - $805 per traveler.
Flights from San Francisco (SFO) to London (LHR)
Origin airport
San Francisco 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, Scandinavian Airlines, Swiss International Air Lines, Turkish Airlines, United, Virgin Atlantic
Popular airline
Virgin Atlantic
Distance
8567 km
Average flight time
18 hours 28 mins