How does KAYAK find such low prices on flights from California to London?

KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from California to London.

How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from California to London?

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to London from California is likely to change within 7 days, so travelers know whether to wait or book now.

What is the Hacker Fare option on flights from California to London?

Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to London with an airline and back to California with another airline.

What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from California to London?

Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to London from California up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

C$ 243 CHEAP FLIGHTS from California to London

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Cheap Flights from California to London

Discover the best prices for you by selecting your travel dates on KAYAK.

Round-trip

One-way

Last minute

Recent round-trip flight deals from California to London

Thu, 22 Oct - Thu, 29 Oct

6:00 a.m. - 4:45 p.m.SFO San Francisco-YXU London

7h 45m1 stop Calgary

7:40 a.m. - 4:50 p.m.YXU London-SFO San Francisco

12h 10m1 stop Calgary

C$ 498WestJet

Tue, 13 Oct - Mon, 26 Oct

1:00 p.m. - 5:20 a.m.SFO San Francisco-YXU London

13h 20m1 stop Calgary

7:40 a.m. - 12:51 p.m.YXU London-SFO San Francisco

32h 11m2 stops Calgary San Diego

C$ 517Multiple Airlines

Wed, 18 Nov - Mon, 23 Nov

4:40 p.m. - 8:37 a.m.SFO San Francisco-YXU London

12h 57m1 stop Toronto Pearson Intl

3:25 p.m. - 9:30 p.m.YXU London-SFO San Francisco

9h 05m1 stop Toronto Pearson Intl

C$ 521Air Canada

Tue, 13 Oct - Mon, 26 Oct

6:00 a.m. - 5:20 a.m.SFO San Francisco-YXU London

20h 20m1 stop Calgary

7:40 a.m. - 4:50 p.m.YXU London-SFO San Francisco

12h 10m1 stop Calgary

C$ 527WestJet

Wed, 18 Nov - Mon, 23 Nov

6:30 a.m. - 9:52 p.m.SFO San Francisco-YXU London

12h 22m2 stops Vancouver Intl Toronto Pearson Intl

9:15 a.m. - 3:40 p.m.YXU London-SFO San Francisco

9h 25m1 stop Toronto Pearson Intl

C$ 532Air Canada

Tue, 20 Oct - Thu, 22 Oct

1:00 p.m. - 5:20 a.m.SFO San Francisco-YXU London

13h 20m1 stop Calgary

6:10 a.m. - 12:00 p.m.YXU London-SFO San Francisco

8h 50m1 stop Calgary

C$ 542WestJet

Tue, 17 Nov - Mon, 23 Nov

4:55 p.m. - 2:47 p.m.SFO San Francisco-YXU London

18h 52m2 stops Vancouver Intl Toronto Pearson Intl

5:30 a.m. - 1:10 p.m.YXU London-SFO San Francisco

10h 40m1 stop Toronto Pearson Intl

C$ 558Air Canada

Tue, 6 Oct - Sat, 10 Oct

5:05 p.m. - 5:43 p.m.SAN San Diego-YXU London

21h 38m2 stops Vancouver Intl Toronto Pearson Intl

8:20 p.m. - 4:12 p.m.YXU London-SAN San Diego

22h 52m2 stops Toronto Pearson Intl Vancouver Intl

C$ 558Air Canada

Tue, 17 Nov - Mon, 23 Nov

2:00 p.m. - 8:37 a.m.SFO San Francisco-YXU London

15h 37m1 stop Toronto Pearson Intl

5:30 a.m. - 1:10 p.m.YXU London-SFO San Francisco

10h 40m1 stop Toronto Pearson Intl

C$ 560Air Canada

Tue, 20 Oct - Thu, 22 Oct

7:30 p.m. - 5:43 p.m.SFO San Francisco-YXU London

19h 13m2 stops Vancouver Intl Toronto Pearson Intl

8:20 p.m. - 3:21 p.m.YXU London-SFO San Francisco

22h 01m2 stops Toronto Pearson Intl Vancouver Intl

C$ 567Air Canada

Useful Info

Cheapest flight	C$ 243

Flight from San Francisco to London

How does KAYAK find such low prices on flights from California to London?
KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from California to London.
How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from California to London?
KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to London from California is likely to change within 7 days, so travelers know whether to wait or book now.
What is the Hacker Fare option on flights from California to London?
Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to London with an airline and back to California with another airline.
What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from California to London?
Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to London from California up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.