What is the cheapest airline that flies from California to London?

WestJet is the most popular carrier operating from California to London

How long does it take to fly to London, Ontario?

If you’re flying from a popular airport in California, such as Los Angeles or San Diego, and flying into London, Ontario, then you can expect flight times to average 4h 42m and 4h 50m, respectively.

What airlines fly to London, Ontario?

Air Canada, Porter Airlines and United Airlines are the top three most popular airlines that fly to London, Ontario from California according to our data. Air Canada is the first choice among our users, with 41% of people opting to fly with this airline when traveling to London, Ontario. Keep in mind that there are 8 different airlines that fly to London, Ontario on a routine basis, so you have a few additional options to choose from.

When did momondo last update prices for flights from California to London Airport?

Prices for flights from California to London Airport were last updated today.

How many operators does momondo search for flights from California to London Airport?

There are 3 operators available for flights from California to London Airport as of December 2025.

How old do you have to be to fly from California to London Airport?

The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from California to London Airport.

What documentation or ID do you need to fly to London Airport?

The travel and health documents required for your trip to London Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at London Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

$117 Cheap Flights from California to London in 2025/26

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Find the cheapest flights from California to London

Round-trip

One-way

Cheap round-trip flights

Enter your travel dates to find the best prices.

8:45 am - 9:18 pm

SFO

YXU

9h 33m1 stop

5:10 am - 10:45 am

YXU

SFO

8h 35m1 stop

$330Air Canada

Tue, Apr 21 - Sat, Apr 25

8:45 am - 9:18 pm

SFO

YXU

9h 33m1 stop

5:10 am - 12:32 pm

YXU

SFO

10h 22m2 stops

$335Air Canada

Tue, Apr 21 - Sat, Apr 25

1:00 pm - 6:34 am

SFO

YXU

14h 34m1 stop

8:10 pm - 12:12 pm

YXU

SFO

19h 02m1 stop

$349WestJet

Thu, Jan 15 - Mon, Jan 19

11:50 am - 6:35 am

LAX

YXU

15h 45m2 stops

8:10 pm - 10:03 pm

YXU

LAX

28h 53m1 stop

$353WestJet

Thu, Feb 5 - Mon, Feb 9

8:50 am - 9:21 pm

LAX

YXU

9h 31m2 stops

5:40 pm - 12:59 am

YXU

LAX

10h 19m2 stops

$467United Airlines

Thu, Feb 5 - Mon, Feb 9

10:00 pm - 9:20 pm

SAN

YXU

20h 20m2 stops

5:10 am - 8:49 pm

YXU

SAN

18h 39m3 stops

$558United Airlines

Thu, Jan 15 - Sun, Jan 18

1:31 pm - 7:07 pm

SJC

YXU

26h 36m2 stops

6:00 am - 7:12 pm

YXU

SJC

16h 12m2 stops

$597Multiple Airlines

Fri, May 15 - Sat, May 30

2:36 pm - 6:35 am

SJC

YXU

36h 59m2 stops

8:10 pm - 10:04 pm

YXU

SJC

28h 54m2 stops

$652Multiple Airlines

Wed, Mar 4 - Wed, Mar 18

9:05 am - 5:12 am

SJC

YXU

17h 07m2 stops

6:00 am - 5:04 pm

YXU

SJC

14h 04m2 stops

$676Delta

Fri, May 15 - Sat, May 30

9:05 am - 5:12 am

SJC

YXU

17h 07m2 stops

6:00 am - 5:04 pm

YXU

SJC

14h 04m2 stops

$701Delta

Fri, May 15 - Sat, May 30

WestJet flights from California to London, Ontario

Our best WestJet deals on California to London, Ontario flight tickets

WestJet

Jan 15

SFO1:00 pmSan Francisco

14h 34m

1 stop

YXU6:34 amLondon

Jan 19

YXU8:10 pmLondon

19h 02m

1 stop

SFO12:12 pmSan Francisco

$349

Find similar

WestJet

Feb 5

LAX11:50 amLos Angeles

15h 45m

2 stops

YXU6:35 amLondon

Feb 9

YXU8:10 pmLondon

28h 53m

1 stop

LAX10:03 pmLos Angeles

$353

Find similar

WestJet

Feb 5

LAX7:00 amLos Angeles

20h 35m

1 stop

YXU6:35 amLondon

Feb 9

YXU8:10 pmLondon

28h 53m

1 stop

LAX10:03 pmLos Angeles

$374

Find similar

United Airlines flights from California to London, Ontario

Our best United Airlines deals on California to London, Ontario flight tickets

United Airlines

Feb 5

LAX8:50 amLos Angeles

9h 31m

2 stops

YXU9:21 pmLondon

Feb 9

YXU5:40 pmLondon

10h 19m

2 stops

LAX12:59 amLos Angeles

$467

Find similar

United Airlines

Jan 15

SAN10:00 pmSan Diego

20h 20m

2 stops

YXU9:20 pmLondon

Jan 18

YXU5:10 amLondon

18h 39m

3 stops

SAN8:49 pmSan Diego

$558

Find similar

United Airlines

Jan 25

SMF6:45 amSacramento Intl

23h 01m

2 stops

YXU8:46 amLondon

Jan 29

YXU5:10 amLondon

31h 38m

2 stops

SMF9:48 amSacramento Intl

$642

Find similar

momondo Fare Finder

Use the filters below to find and compare flights from California to London, Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Tue 4/21

8:45 am-9:18 pm

1 stop9h 33m

London

Sat 4/25

5:10 am-10:45 am

1 stop8h 35m

$330

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Tue 4/21

8:45 am-9:18 pm

1 stop9h 33m

London

Sat 4/25

5:10 am-12:32 pm

2 stops10h 22m

$335

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Thu 1/15

1:00 pm-6:34 am

1 stop14h 34m

London

Mon 1/19

8:10 pm-12:12 pm

1 stop19h 02m

$349

Los AngelesLondon

LAX - YXU

LAXYXU

Los Angeles

Thu 2/5

11:50 am-6:35 am

2 stops15h 45m

London

Mon 2/9

8:10 pm-10:03 pm

1 stop28h 53m

$353

Los AngelesLondon

LAX - YXU

LAXYXU

Los Angeles

Thu 2/5

8:50 am-9:21 pm

2 stops9h 31m

London

Mon 2/9

5:40 pm-12:59 am

2 stops10h 19m

$467

San DiegoLondon

SAN - YXU

SANYXU

San Diego

Thu 1/15

10:00 pm-9:20 pm

2 stops20h 20m

London

Sun 1/18

5:10 am-8:49 pm

3 stops18h 39m

$558

San JoseLondon

SJC - YXU

SJCYXU

San Jose

Fri 5/15

1:31 pm-7:07 pm

2 stops26h 36m

London

Sat 5/30

6:00 am-7:12 pm

2 stops16h 12m

$597

San JoseLondon

SJC - YXU

SJCYXU

San Jose

Wed 3/4

2:36 pm-6:35 am

2 stops36h 59m

London

Wed 3/18

8:10 pm-10:04 pm

2 stops28h 54m

$652

San JoseLondon

SJC - YXU

SJCYXU

San Jose

Fri 5/15

9:05 am-5:12 am

2 stops17h 07m

London

Sat 5/30

6:00 am-5:04 pm

2 stops14h 04m

$676

San JoseLondon

SJC - YXU

SJCYXU

San Jose

Fri 5/15

9:05 am-5:12 am

2 stops17h 07m

London

Sat 5/30

6:00 am-5:04 pm

2 stops14h 04m

$701

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from California to London, Ontario

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

Other information

What is the cheapest day to depart on your flight to London, Ontario?

According to our data, Thursday is the cheapest day to fly to London, Ontario from California. The lowest ticket price found for a Thursday departure recently was $492. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. Be sure to avoid booking your departure on a Wednesday as prices are generally higher than usual. According to our data, the average ticket price to London, Ontario on Wednesday is $543.

What is the cheapest time of day to depart on your flight to London, Ontario?

In the evening is the cheapest time of day to fly from California to London, Ontario when you can find flight prices for as low as $338. Flying to London, Ontario in the evening is an ideal time because this is during off-peak travel hours. In the morning is when there is more demand to fly to London, Ontario, so prices are often more expensive at around $568 per ticket.

Can stopping save me money on California to London, Ontario flights?

You could potentially save up to 46% on your flight if you consider stops on a California to London, Ontario flight.

Cheap California to London, Ontario flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from California to London, Ontario

Fastest flight time	6h 50m
Direct flights	None

The fastest flight from California to London, Ontario takes 6h 50m

There are no direct flights from California to London, Ontario. There are no popular flight routes from California to London, Ontario.

Search flight deals

When did momondo last update prices for flights from California to London Airport?
Prices for flights from California to London Airport were last updated today.
How many operators does momondo search for flights from California to London Airport?
There are 3 operators available for flights from California to London Airport as of December 2025.
How old do you have to be to fly from California to London Airport?
The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from California to London Airport.
What documentation or ID do you need to fly to London Airport?
The travel and health documents required for your trip to London Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at London Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

Best airlines flying from California to London, Ontario

Compare and see reviews for airlines that fly from California to London, Ontario with momondo

Airline	Rating	Free Cancellation	Price
WestJet	PriceFrom $162	Free Cancellation	Rating 7.2 3,204 reviews	Search WestJet flights
Air Canada	PriceFrom $178	Free Cancellation	Rating 7.1 10,534 reviews	Search Air Canada flights
United Airlines	PriceFrom $186	Free Cancellation	Rating 7.4 9,092 reviews	Search United Airlines flights

Grand Bend

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Why use momondo?

Why should I use momondo to find a flight deal from California to London?

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from California to London for you.

Can I find flights from California to London with flexible booking policies on momondo?

Yes. All flights to London from California on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from California to London?

Once you have performed a search for California to London flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

I’m not ready to book a flight from California to London right now. Can momondo alert me if prices change?

If you are simply researching potential flights to London, momondo offers a useful price alert feature which will track prices for flights to London from California and alert you when they change.