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. Visit our flight page for the latest deals!>/a>

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. Visit our flight page for the latest deals!>/a>

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. Visit our flight page for the latest deals!>/a>

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. Visit our flight page for the latest deals!>/a>

$304 CHEAP FLIGHTS from California to London

KAYAK searches hundreds of travel sites at once for deals on flights to London

...and more

Travelers love KAYAK

41 299 237 searches in the past 7 days on KAYAK

Save 24% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Bundle and saveSave money when you bundle your flight + hotel.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Cheapest round-trip

$577

Overall average: $834

Iberia

Wed 1/21Thu 1/29

ONT - LHR • 1 stop

Cheapest non-stop

$595

Typical prices: $647-$785

British Airways

Tue 1/20Mon 2/2

SFO - LHR • Non-stop

Start a new search

KAYAK searches 100s of sites at once to find you the best travel deals.

We hope you love your trip to London!

Flight Deals

Cheap Flights from California to London

Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from California to London that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.

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

Round-trip

One-way

Last minute

Direct

Recent round-trip flight deals from California to London

Wed, Jan 21 - Thu, Jan 29

10:58 am - 10:00 am

ONT

LHR

15h 02m1 stop

7:30 am - 10:48 pm

LHR

ONT

23h 18m2 stops

$577Iberia

Thu, May 14 - Sat, May 23

7:55 pm - 10:05 pm

SFO

LHR

18h 10m1 stop

8:00 am - 5:35 pm

LHR

SFO

17h 35m1 stop

$591TAP AIR PORTUGAL

Wed, Apr 29 - Tue, May 5

4:35 pm - 11:00 am

SFO

LHR

10h 25mnonstop

10:45 am - 1:50 pm

LHR

SFO

11h 05mnonstop

$592British Airways

Wed, Feb 18 - Mon, Feb 23

7:25 pm - 5:05 pm

SFO

LCY

13h 40m1 stop

9:15 am - 4:30 pm

LCY

SFO

15h 15m1 stop

$593SWISS

Sat, Mar 14 - Tue, Apr 14

5:40 pm - 2:35 pm

SFO

LHR

37h 55m2 stops

6:40 am - 2:40 pm

LHR

SFO

16h 00m1 stop

$593Scandinavian Airlines

Tue, Jan 27 - Tue, Feb 17

11:45 am - 5:50 pm

SFO

LGW

22h 05m2 stops

6:40 pm - 4:30 pm

LGW

SFO

29h 50m1 stop

$594SWISS

Sun, Jan 11 - Tue, Jan 27

10:55 pm - 8:10 pm

SFO

LHR

13h 15m1 stop

11:40 am - 2:40 pm

LHR

SFO

11h 00mnonstop

$594Delta

Sun, Mar 15 - Sun, Apr 12

5:40 pm - 5:40 pm

SFO

LHR

17h 00m1 stop

10:20 am - 2:40 pm

LHR

SFO

36h 20m1 stop

$595Scandinavian Airlines

Mon, Feb 2 - Thu, Feb 19

4:45 pm - 1:15 pm

ONT

LHR

12h 30m1 stop

10:35 am - 6:39 pm

LHR

ONT

16h 04m1 stop

$596British Airways

Sun, Apr 5 - Tue, Apr 14

3:55 pm - 10:40 am

SFO

LHR

10h 45mnonstop

6:30 am - 11:45 am

LHR

SFO

13h 15m1 stop

$600Delta

Useful Info

Low season	January
High season	June
Cheapest flight	$304

Best time to beat the crowds with an average 11% drop in price.

Most popular time to fly with an average 38% increase in price.

Flight from Ontario to London Heathrow Airport

GeraldFlew with Virgin Atlantic

SFO

LHR

Jun 2025

Virgin Atlantic uses terminal 3. Much faster clearing customs than terminal 5

Verified travelerFlew with American Airlines

SFO

LHR

Jun 2025

Large number of passengers on the flight so arrive early to the airport and to the boarding gate

ValerieFlew with British Airways

LAX

LHR

Apr 2025

It was difficult to tell if the checked luggage was included. London Heathrow is huge and if the second flight hasn't been delayed I would have missed it.

PallaviFlew with British Airways

SFO

LHR

Apr 2025

Eat at the lounge first so you are not stuck eating overcooked cheese ravioli

Verified travelerFlew with Iberia

LAX

LHR

Jan 2025

Make sure you arrive early. Sometimes, the traffic getting to LAX can be a total nightmare.

WeiFlew with British Airways

LAX

LHR

Sep 2024

Connection takes long, Make sure you plan enough time.

TapanFlew with British Airways

SFO

LHR

Oct 2024

Great baggage policy in BA.. The worst part was experience at London Heathrow airport. Security was slow, too many people. Almost lost connecting flight even with 2 hours layover.

Verified travelerFlew with British Airways

LAX

LHR

Mar 2024

Pack your own food if you have dietary restrictions and fly other airlines if possible

MichelleFlew with British Airways

LAX

LHR

May 2024

Make sure you separate your luggage tags from your tickets

ShaunaFlew with British Airways

LAX

LHR

Dec 2023

I would suggest calling the airline to make sure that their TV screens work on the back of the seats, and if they don’t work that the entertainment option would work on your cell phones.

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.

Hounslow

Slough

Wembley

Hayes

Richmond

Luton

Ilford

Crawley

Watford

Guildford

Eastbourne

Kingston upon Thames

Colchester

St. Albans

Ipswich

Twickenham

Bedford

Barnet

Harrow

Hastings

Everything you need to know for your flight to London

Cabin class

Complete your trip

Direct Flights

Flights to other cities

Origins

Other airports

Return flight deals

Cabin class types available on flights to California

First Class flights to Londonfrom $4,886

Business Class flights to Londonfrom $657

Prem Econ Class flights to Londonfrom $1,321

Economy Class flights to Londonfrom $503

$304 Find Cheap Flights from California to London

KAYAK searches hundreds of travel sites at once for deals on flights to London

Everything you should know

Cheap Flights from California to London

Recent round-trip flight deals from California to London

Recent one-way flight deals from California to London

Recent last minute flight deals from California to London

Recent direct flight deals from California to London

Good to know

Flights from California to London: the best tips from KAYAK users

FAQs for booking flights from California 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.

Traveling to a place near London?

Everything you need to know for your flight to London

Cabin class types available on flights to California

Complete your trip to London with a hotel stay or car rental

Find direct flights for London

Flights to other popular destinations

Flights from domestic origins to London

Choose which airport to fly into in London

Find deals for your return flight