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>

$290 CHEAP FLIGHTS from California to London

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

Direct

Recent round-trip flight deals from California to London

Tue, Aug 25 - Thu, Aug 27

7:06 am - 12:00 pm

ONT

LHR

20h 54m

2 stops

12:00 pm - 10:04 pm

LHR

ONT

18h 04m

1 stop

$783Multiple Airlines

Sat, Sep 19 - Tue, Sep 22

1:56 pm - 7:25 am

ONT

LHR

33h 29m

1 stop

6:00 am - 7:57 pm

LHR

ONT

21h 57m

2 stops

$794SWISS

Tue, Nov 10 - Tue, Nov 17

4:47 pm - 1:15 pm

ONT

LHR

12h 28m

1 stop

3:00 pm - 10:23 pm

LHR

ONT

15h 23m

1 stop

$854British Airways

Mon, Sep 14 - Mon, Sep 28

12:35 pm - 12:50 pm

ONT

LHR

16h 15m

1 stop

7:30 pm - 9:58 pm

LHR

ONT

34h 28m

2 stops

$858Multiple Airlines

Wed, Sep 9 - Wed, Sep 23

1:31 pm - 10:30 am

ONT

LHR

12h 59m

1 stop

2:25 pm - 9:08 pm

LHR

ONT

14h 43m

1 stop

$861British Airways

Tue, Nov 3 - Tue, Nov 10

6:10 am - 10:00 am

ONT

LHR

19h 50m

1 stop

6:00 am - 10:23 pm

LHR

ONT

24h 23m

2 stops

$866Iberia

Sun, Aug 23 - Tue, Sep 8

11:45 am - 3:35 pm

ONT

LHR

19h 50m

1 stop

6:30 am - 5:16 pm

LHR

ONT

18h 46m

2 stops

$867KLM

Wed, Aug 26 - Wed, Sep 2

12:00 pm - 11:20 am

ONT

LHR

15h 20m

1 stop

11:45 am - 10:23 pm

LHR

ONT

18h 38m

2 stops

$868Delta

Tue, Aug 18 - Thu, Nov 19

5:55 pm - 12:15 pm

SFO

LHR

10h 20mnonstop

11:40 am - 2:40 pm

LHR

SFO

11h 00mnonstop

$879KLM

Tue, Sep 29 - Sun, Oct 11

5:55 pm - 12:15 pm

SFO

LHR

10h 20mnonstop

6:30 am - 11:45 am

LHR

SFO

13h 15m

1 stop

$881Delta

Useful Info

Low season	January
High season	July
Cheapest flight	$290

Best time to beat the crowds with an average 13% drop in price.

Most popular time to fly with an average 4% increase in price.

Flight from Los Angeles to London Heathrow Airport

Verified travelerFlew with British Airways

SFO

LHR

Dec 2025

If not getting off in London make sure you have enough time to get to your connecting gates

Verified travelerFlew with Iberia

SFO

LHR

Jan 2026

Buy your flight directly from the airline because the cancellation process is purgatory

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

Hayes

Richmond

Wembley

Luton

Crawley

Ilford

Watford

Eastbourne

Bedford

Colchester

Twickenham

Guildford

Ipswich

Kingston upon Thames

St. Albans

Maidenhead

Newbury

Barnet

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 $1,010

Premium Economy Class flights to Londonfrom $1,509

Economy Class flights to Londonfrom $289

$290 Find Cheap Flights from California to London

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

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