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

Air Canada, United Airlines, and WestJet are the most popular carriers 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 30m and 4h 55m, 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 47% 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 2 operators available for flights from California to London Airport as of April 2026.

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.

$247 Cheap Flights from California to London in 2026

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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.

6:05 pm - 5:20 am

SFO

YXU

8h 15m

1 stop

5:55 pm - 4:40 pm

YXU

SFO

25h 45m

1 stop

$417WestJet

Sat, Jun 6 - Mon, Jun 29

6:05 pm - 5:20 am

SFO

YXU

8h 15m

1 stop

6:10 am - 12:00 pm

YXU

SFO

8h 50m

1 stop

$437WestJet

Thu, Jul 9 - Tue, Jul 14

6:05 pm - 5:20 am

SFO

YXU

8h 15m

1 stop

2:40 pm - 9:55 pm

YXU

SFO

10h 15m

2 stops

$442WestJet

Thu, Jul 9 - Tue, Jul 14

6:05 pm - 5:20 am

SFO

YXU

8h 15m

1 stop

6:10 am - 12:00 pm

YXU

SFO

8h 50m

1 stop

$446WestJet

Wed, Jun 3 - Sat, Jun 6

8:05 am - 9:38 pm

SFO

YXU

10h 33m

2 stops

5:10 am - 10:50 am

YXU

SFO

8h 40m

1 stop

$458Air Canada

Sat, May 9 - Wed, May 13

1:15 pm - 8:53 am

SAN

YXU

16h 38m

1 stop

5:10 am - 12:18 pm

YXU

SAN

10h 08m

1 stop

$459Air Canada

Wed, May 6 - Wed, May 13

7:40 pm - 9:38 pm

SAN

YXU

22h 58m

3 stops

5:10 am - 12:18 pm

YXU

SAN

10h 08m

1 stop

$546United Airlines

Wed, May 6 - Wed, May 13

9:05 pm - 11:43 am

SAN

YXU

11h 38m

2 stops

9:30 am - 11:54 pm

YXU

SAN

17h 24m

2 stops

$556United Airlines

Thu, May 28 - Sat, May 30

7:06 am - 5:20 am

SJC

YXU

19h 14m

2 stops

5:55 pm - 9:45 am

YXU

SJC

42h 50m

2 stops

$700Multiple Airlines

Fri, May 15 - Sat, May 30

8:15 pm - 5:20 am

SJC

YXU

30h 05m

2 stops

5:55 pm - 9:45 am

YXU

SJC

42h 50m

2 stops

$710Multiple Airlines

Fri, May 15 - Sat, May 30

United Airlines flights from California to London, Ontario

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

United Airlines

Jun 3

SFO6:54 pmSan Francisco

17h 04m

2 stops

YXU2:58 pmLondon

Jun 6

YXU5:10 amLondon

8h 40m

1 stop

SFO10:50 amSan Francisco

$545

United Airlines

May 6

SAN7:40 pmSan Diego

22h 58m

3 stops

YXU9:38 pmLondon

May 13

YXU5:10 amLondon

10h 08m

1 stop

SAN12:18 pmSan Diego

$546

United Airlines

May 28

SAN9:05 pmSan Diego

11h 38m

2 stops

YXU11:43 amLondon

May 30

YXU9:30 amLondon

17h 24m

2 stops

SAN11:54 pmSan Diego

$556

WestJet flights from California to London, Ontario

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

WestJet

Jun 6

SFO6:05 pmSan Francisco

8h 15m

1 stop

YXU5:20 amLondon

Jun 29

YXU5:55 pmLondon

25h 45m

1 stop

SFO4:40 pmSan Francisco

$417

WestJet

Jul 9

SFO6:05 pmSan Francisco

8h 15m

1 stop

YXU5:20 amLondon

Jul 14

YXU6:10 amLondon

8h 50m

1 stop

SFO12:00 pmSan Francisco

$437

WestJet

Jul 9

SFO6:05 pmSan Francisco

8h 15m

1 stop

YXU5:20 amLondon

Jul 14

YXU2:40 pmLondon

10h 15m

2 stops

SFO9:55 pmSan Francisco

$442

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

Cheapest round-trip

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Sat 6/6

6:05 pm-5:20 am

1 stop8h 15m

London

Mon 6/29

5:55 pm-4:40 pm

1 stop25h 45m

$417

Quickest round-trip

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Thu 7/9

6:05 pm-5:20 am

1 stop8h 15m

London

Tue 7/14

6:10 am-12:00 pm

1 stop8h 50m

$437

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Thu 7/9

6:05 pm-5:20 am

1 stop8h 15m

London

Tue 7/14

2:40 pm-9:55 pm

2 stops10h 15m

$442

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Wed 6/3

6:05 pm-5:20 am

1 stop8h 15m

London

Sat 6/6

6:10 am-12:00 pm

1 stop8h 50m

$446

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Sat 5/9

8:05 am-9:38 pm

2 stops10h 33m

London

Wed 5/13

5:10 am-10:50 am

1 stop8h 40m

$458

San DiegoLondon

SAN - YXU

SANYXU

San Diego

Wed 5/6

1:15 pm-8:53 am

1 stop16h 38m

London

Wed 5/13

5:10 am-12:18 pm

1 stop10h 08m

$459

San DiegoLondon

SAN - YXU

SANYXU

San Diego

Wed 5/6

7:40 pm-9:38 pm

3 stops22h 58m

London

Wed 5/13

5:10 am-12:18 pm

1 stop10h 08m

$546

San DiegoLondon

SAN - YXU

SANYXU

San Diego

Thu 5/28

9:05 pm-11:43 am

2 stops11h 38m

London

Sat 5/30

9:30 am-11:54 pm

2 stops17h 24m

$556

San JoseLondon

SJC - YXU

SJCYXU

San Jose

Fri 5/15

7:06 am-5:20 am

2 stops19h 14m

London

Sat 5/30

5:55 pm-9:45 am

2 stops42h 50m

$700

San JoseLondon

SJC - YXU

SJCYXU

San Jose

Fri 5/15

8:15 pm-5:20 am

2 stops30h 05m

London

Sat 5/30

5:55 pm-9:45 am

2 stops42h 50m

$710

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

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

You could potentially save up to 67% 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.

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Frequently asked questions about flying from California to London, Ontario

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 2 operators available for flights from California to London Airport as of April 2026.
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 3,320 reviews		Search WestJet flights
Air Canada	PriceFrom $210	Free Cancellation	Rating 7.1 10,916 reviews		Search Air Canada flights

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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.

An easier way to manage your London, Ontario trip

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Cheap flights from California to London from $247

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from California to London departing on 6/14. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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United Airlines flights from California to London, Ontario

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

WestJet flights from California to London, Ontario

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

momondo Fare Finder

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

See travel insights to London from

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

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

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

What airlines fly to London, Ontario?

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

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

Direct flights

Frequently asked questions about flying from California to London, Ontario

Best airlines flying from California to London, Ontario

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

Traveling to a place near London?

Why use momondo?

An easier way to manage your London, Ontario trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to Canada

Airports servicing Ontario

Fly your favorite airline to London

Airlines are sorted and displayed according to clicks in the past 7 days on momondo

Cabin classes currently available on flights to London

List of cabin classes available on flights landing in London. Availability may vary depending on flight origin and airline.

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