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Cheap flights from California to London, ON from C$ 425

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/5. Fares are subject to change and may not be available on all flights or dates of travel.
LAX — YXU
5 Apr — 12 Apr1
1 adult

Cheap flight deals from California to London

Keep the following information in mind while searching for California to London flight deals. Data was last updated 31 March 2025.

Round-trip from

C$ 425

Popular in

May

Cheapest in

February

Average price

C$ 442
WestJet
  • WestJet
  • 9/5-16/5
  • 2 total stops
  • 27h 44m total
  • California to London
Search Deals
Highest demand for flights based on searches. 17% potential increase in price (C$ 184 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease (C$ 36 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 2025
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Find flight deals from California to London

Cheapest flights from California to London
Explore the most affordable flight options available from California to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 31 March 2025.

Fri 9/57:30 a.m.SFO - YXU
1 stop8h 39mWestJet
Fri 16/58:00 p.m.YXU - SFO
1 stop19h 05mWestJet
Deal found 30/3C$ 425
Tue 29/48:30 a.m.SFO - YXU
1 stop8h 49mAir Canada
Tue 6/56:15 a.m.YXU - SFO
1 stop9h 57mAir Canada
Deal found 31/3C$ 518
Tue 29/410:15 a.m.SFO - YXU
2 stops29h 54mMultiple Airlines
Tue 6/58:00 p.m.YXU - SFO
2 stops16h 30mMultiple Airlines
Deal found 31/3C$ 648
Thu 8/512:10 a.m.SFO - YXU
2 stops11h 54mUnited Airlines
Fri 16/53:45 p.m.YXU - SFO
1 stop8h 17mUnited Airlines
Deal found 30/3C$ 691
Sun 13/47:54 p.m.SJC - YXU
2 stops12h 26mMultiple Airlines
Wed 16/48:00 p.m.YXU - SJC
3 stops25h 57mMultiple Airlines
Deal found 31/3C$ 1,383
Thu 15/512:35 p.m.SJC - YXU
2 stops17h 44mUnited Airlines
Thu 22/56:15 a.m.YXU - SJC
2 stops10h 06mUnited Airlines
Deal found 31/3C$ 1,387
Sun 13/46:27 p.m.SJC - YXU
2 stops22h 52mAir Canada
Wed 16/45:15 a.m.YXU - SJC
2 stops15h 16mAir Canada
Deal found 31/3C$ 1,401
Thu 3/46:15 a.m.SAN - YXU
3 stops33h 58mMultiple Airlines
Sat 5/45:05 p.m.YXU - SAN
3 stops33h 46mMultiple Airlines
Deal found 30/3C$ 1,448
Thu 3/43:57 p.m.SAN - YXU
2 stops14h 21mUnited Airlines
Sat 5/49:55 a.m.YXU - SAN
3 stops13h 27mUnited Airlines
Deal found 30/3C$ 2,366
Thu 3/412:35 p.m.SAN - YXU
1 stop23h 13mAir Canada
Sat 5/43:25 p.m.YXU - SAN
1 stop23h 23mAir Canada
Deal found 30/3C$ 4,750

Cheapflights Fare Finder

Customize your flight search to find flights from California to London that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 629,999 searches. Data last updated 31 March 2025.
Use the filters below to find and compare flights from California to London that are best for you.

Fly from

California

Fly to

London

Route

Depart

Return

Price

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Fri 9/5

7:30 a.m.-7:09 p.m.

1 stop8h 39m

London

Fri 16/5

8:00 p.m.-12:05 p.m.

1 stop19h 05m

C$ 425

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Tue 29/4

8:30 a.m.-8:19 p.m.

1 stop8h 49m

London

Tue 6/5

6:15 a.m.-1:12 p.m.

1 stop9h 57m

C$ 518

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Tue 29/4

10:15 a.m.-7:09 p.m.

2 stops29h 54m

London

Tue 6/5

8:00 p.m.-9:30 a.m.

2 stops16h 30m

C$ 648

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Thu 8/5

12:10 a.m.-3:04 p.m.

2 stops11h 54m

London

Fri 16/5

3:45 p.m.-9:02 p.m.

1 stop8h 17m

C$ 691

San JoseLondon

SJC - YXU

SJCYXU

San Jose

Sun 13/4

7:54 p.m.-11:20 a.m.

2 stops12h 26m

London

Wed 16/4

8:00 p.m.-6:57 p.m.

3 stops25h 57m

C$ 1,383

San JoseLondon

SJC - YXU

SJCYXU

San Jose

Thu 15/5

12:35 p.m.-9:19 a.m.

2 stops17h 44m

London

Thu 22/5

6:15 a.m.-1:21 p.m.

2 stops10h 06m

C$ 1,387

San JoseLondon

SJC - YXU

SJCYXU

San Jose

Sun 13/4

6:27 p.m.-8:19 p.m.

2 stops22h 52m

London

Wed 16/4

5:15 a.m.-5:31 p.m.

2 stops15h 16m

C$ 1,401

Flights are sorted by cheapest round-trip flights first.

Deals found on 30/3

Best time to book a flight from California to London

Have a flexible travel schedule? Discover the best time to fly to London from California with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from California to London

What is the cheapest month to book a flight from California to London, Ontario?

Currently, October is the cheapest month in which you can book a flight from California to London, Ontario (average of C$ 243). Flying from California to London, Ontario in December is currently the most expensive (average of C$ 478). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from CA to YXU?

Find hourly flight availability from California to London. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 31 March 2025.

When flying from California to London, Ontario, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Rainfall in London by month

Plan your trip to London by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in London, Ontario ranges from 70.0 - 100.0 mm per month. January is typically the wettest month, when rainfall can reach 100.0 mm. March is typically the driest time to visit London, Ontario when rainfall is around 70.0 mm.

Temperature in London by month

Plan your trip to London by taking into account the average temperature totals by month.

If weather is an important factor for your trip to London, Ontario, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 20.0 C. Travellers hoping to avoid the cold should look outside of February, when temperatures are typically at their lowest (around -6.0 C).

Reviews of airlines servicing London

Get insights into the airlines that provide service to London. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to London. Reviews last updated 31 March 2025.
Read through reviews of airlines operating flights from California to London, such as United Airlines, WestJet and Air Canada. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
8,614 reviews
Check prices

Boarding

7.7

Overall

7.4

Entertainment

7.0

Comfort

7.3

Food

6.6

Crew

8.1

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
United Airlines
7.4
Good
8,614 reviews
United Airlines
7.4
Good
8,614 reviews
Check prices

Boarding

7.7

Overall

7.4

Entertainment

7.0

Comfort

7.3

Food

6.6

Crew

8.1

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
WestJet
7.2
Good
2,789 reviews
United Airlines
7.4
Good
8,614 reviews
Check prices

Boarding

7.7

Overall

7.4

Entertainment

7.0

Comfort

7.3

Food

6.6

Crew

8.1

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
Air Canada
7.0
Good
9,012 reviews
United Airlines
7.4
Good
8,614 reviews
Check prices

Boarding

7.7

Overall

7.4

Entertainment

7.0

Comfort

7.3

Food

6.6

Crew

8.1

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??

Related info for your journey

Find useful and relevant information for your journey from California to London. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to London from California?

    London (YXU) is the airport you will fly into if you book a flight from California to London. It is only a 8.6 km journey from London (YXU) to London’s city centre.

  • What are the most popular routes from California to London, Ontario?

    The most popular route from California to London, Ontario is San Diego - London. You may also consider San Francisco - London or San Jose - London.

  • Can I find deals for flights from California to London that include hotel bookings?

    Yes. In addition to deals on California to London flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from California to London?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from California to London.

  • Can I find deals for business class flights from California to London?

    Yes. Cheapflights offers flight deals from California to London by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from California to London, Ontario?

    Currently, October is the cheapest month in which you can book a flight from California to London, Ontario (average of C$ 243). Flying from California to London, Ontario in December is currently the most expensive (average of C$ 478). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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