What are the cheapest airlines flying from London, Ontario to San Francisco round-trip?

WestJet, at $240, was found to be the cheapest airline from London, Ontario to San Francisco.Alternate airlines to your destination round-trip include United Airlines and Air Canada. WestJet is currently priced 47% below the average price you’ll pay for this route.

What is the cheapest day to fly from London, Ontario to San Francisco?

Travelers seeking maximum savings on their London, Ontario to San Francisco flight should consider departing on Friday afternoons when fares are most often at their lowest. Friday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

What is the cheapest month to fly from London, Ontario to San Francisco?

Flights from London, Ontario to San Francisco lean towards being more expensive in December. Prices are generally better when you fly from London, Ontario to San Francisco in June, with the cheapest ticket starting at $208.

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

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

Most accurate provider : When it comes to deals on London, Ontario-San Francisco flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on London, Ontario-San Francisco flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from London, Ontario-San Francisco flight searches over the past month and is updated monthly.

Most trusted provider : When it comes to deals on London, Ontario-San Francisco flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for London, Ontario-San Francisco flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Can I find deals for flights from London to San Francisco that include hotel bookings?

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

How can I find direct flights from London to San Francisco?

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

Can I find deals for business class flights from London to San Francisco?

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

$240+ Flights from London, ON to San Francisco

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1. Tell us where you want to go

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2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from London to San Francisco

Most accurate provider	FlightHub 3 stars
Most trusted provider	FlightHub 3 stars
Round-trip from	$240 (Trip.com)
Popular in	December
Cheapest in	June
Average price	$438

Provider with most accurate pricing for London-San Francisco flight deals.

Search Deals

Provider most trusted by Cheapflights users for London-San Francisco flights.

Search Deals

From London to San Francisco

Search Deals

Highest demand for flights based on searches. 18% potential increase in price ($102 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 4% potential price decrease ($19 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in March 2025

Search Deals

Find flight deals from London to San Francisco

Cheapest flights from London to San Francisco
Explore the most affordable flight options available from London to San Francisco. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 28, 2025.

Tue 7/16:00 amYXU - SFO

2 stops10h 59mWestJet

Wed 7/306:05 pmSFO - YXU

1 stop8h 09mWestJet

Deal found 3/27

$240

Tue 4/223:25 pmYXU - SFO

1 stop9h 12mUnited Airlines

Wed 5/216:30 amSFO - YXU

2 stops23h 48mUnited Airlines

Deal found 3/27

$413

Tue 4/223:25 pmYXU - SFO

2 stops10h 30mAir Canada

Wed 5/212:15 pmSFO - YXU

1 stop16h 03mAir Canada

Deal found 3/26

$450

Tue 4/223:25 pmYXU - SFO

1 stop9h 12mMultiple Airlines

Wed 5/214:50 pmSFO - YXU

1 stop13h 28mMultiple Airlines

Deal found 3/27

$541

Best flights from London to San Francisco
Discover carefully curated flight deals from London to San Francisco that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated March 28, 2025.

Tue 7/16:00 amYXU - SFO

2 stops10h 59mWestJet

Wed 7/306:05 pmSFO - YXU

1 stop8h 09mWestJet

Deal found 3/27

$240

Tue 4/223:25 pmYXU - SFO

1 stop9h 12mUnited Airlines

Wed 5/216:30 amSFO - YXU

2 stops23h 48mUnited Airlines

Deal found 3/27

$413

Tue 4/223:25 pmYXU - SFO

2 stops10h 30mAir Canada

Wed 5/212:15 pmSFO - YXU

1 stop16h 03mAir Canada

Deal found 3/26

$450

Tue 4/223:25 pmYXU - SFO

1 stop9h 12mMultiple Airlines

Wed 5/214:50 pmSFO - YXU

1 stop13h 28mMultiple Airlines

Deal found 3/27

$541

Last-minute flights from London to San Francisco
Discover last-minute flight deals from London to San Francisco. Data last updated March 28, 2025 and is based on user searches.

Tue 4/223:25 pmYXU - SFO

1 stop9h 12mUnited Airlines

Wed 5/216:30 amSFO - YXU

2 stops23h 48mUnited Airlines

Deal found 3/27

$413

Tue 4/223:25 pmYXU - SFO

2 stops10h 30mAir Canada

Wed 5/212:15 pmSFO - YXU

1 stop16h 03mAir Canada

Deal found 3/26

$450

Tue 4/223:25 pmYXU - SFO

1 stop9h 12mMultiple Airlines

Wed 5/214:50 pmSFO - YXU

1 stop13h 28mMultiple Airlines

Deal found 3/27

$541

Cheapflights Fare Finder

Use the filters below to find and compare flights from London to San Francisco that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

LondonSan Francisco

YXU - SFO

YXUSFO

London

Tue 7/1

6:00 am-1:59 pm

2 stops10h 59m

San Francisco

Wed 7/30

6:05 pm-5:14 am

1 stop8h 09m

$240

LondonSan Francisco

YXU - SFO

YXUSFO

London

Tue 4/22

3:25 pm-9:37 pm

1 stop9h 12m

San Francisco

Wed 5/21

6:30 am-9:18 am

2 stops23h 48m

$413

LondonSan Francisco

YXU - SFO

YXUSFO

London

Tue 4/22

3:25 pm-10:55 pm

2 stops10h 30m

San Francisco

Wed 5/21

2:15 pm-9:18 am

1 stop16h 03m

$450

LondonSan Francisco

YXU - SFO

YXUSFO

London

Tue 4/22

3:25 pm-9:37 pm

1 stop9h 12m

San Francisco

Wed 5/21

4:50 pm-9:18 am

1 stop13h 28m

$541

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/27

Compare providers for flights from London to San Francisco

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from London to San Francisco in March.

Provider	Price Accuracy	Trust Score*
FlightHub	Price Accuracy3 stars	Trust Score*3 stars
eDreams	Price Accuracy3 stars	Trust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

Most accurate provider: When it comes to deals on London, Ontario-San Francisco flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on London, Ontario-San Francisco flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from London, Ontario-San Francisco flight searches over the past month and is updated monthly.
Most trusted provider: When it comes to deals on London, Ontario-San Francisco flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for London, Ontario-San Francisco flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from London to San Francisco

Have a flexible travel schedule? Discover the best time to fly to San Francisco from London 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 London to San Francisco

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

Currently, January is the cheapest month in which you can book a flight from London, Ontario to San Francisco (average of $276). Flying from London, Ontario to San Francisco in June is currently the most expensive (average of $398). 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.

Rainfall in San Francisco by month

In terms of precipitation, rainfall in San Francisco ranges from 0.0 - 4.4 inches per month. January is typically the wettest month, when rainfall can reach 4.4 in. July is typically the driest time to visit San Francisco when rainfall is around 0.0 in.

Temperature in San Francisco by month

If weather is an important factor for your trip to San Francisco, use this chart to help with planning. For those seeking warmer temperatures, September is the ideal time of year to visit, when temperatures reach an average of 62.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 51.8 F).

Reviews of airlines servicing San Francisco

United Airlines

7.4

Good

8,603 reviews

Reviews

1 / 20

8.0

Excellent

Anonymous,Dec 2024

YVR - SFO

It was a good experience. The flight took 45 minutes longer to fly and all passengers had to wait inside the plane till the technical issue was fixed. Overall it was a good experience.

United Airlines

7.4

Good

8,603 reviews

United Airlines

7.4

Good

8,603 reviews

Reviews

1 / 20

8.0

Excellent

Anonymous,Dec 2024

YVR - SFO

It was a good experience. The flight took 45 minutes longer to fly and all passengers had to wait inside the plane till the technical issue was fixed. Overall it was a good experience.

WestJet

7.2

Good

2,785 reviews

United Airlines

7.4

Good

8,603 reviews

Reviews

1 / 20

8.0

Excellent

Anonymous,Dec 2024

YVR - SFO

It was a good experience. The flight took 45 minutes longer to fly and all passengers had to wait inside the plane till the technical issue was fixed. Overall it was a good experience.

Air Canada

7.0

Good

8,986 reviews

United Airlines

7.4

Good

8,603 reviews

Reviews

1 / 20

8.0

Excellent

Anonymous,Dec 2024

YVR - SFO

It was a good experience. The flight took 45 minutes longer to fly and all passengers had to wait inside the plane till the technical issue was fixed. Overall it was a good experience.

Related info for your journey

What are the cheapest airlines flying from London, Ontario to San Francisco round-trip?
WestJet, at $240, was found to be the cheapest airline from London, Ontario to San Francisco.Alternate airlines to your destination round-trip include United Airlines and Air Canada. WestJet is currently priced 47% below the average price you’ll pay for this route.
Can I find deals for flights from London to San Francisco that include hotel bookings?
Yes. In addition to deals on London to San Francisco flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from London to San Francisco?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from London to San Francisco.
Can I find deals for business class flights from London to San Francisco?
Yes. Cheapflights offers flight deals from London to San Francisco 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 London, Ontario to San Francisco?
Currently, January is the cheapest month in which you can book a flight from London, Ontario to San Francisco (average of $276). Flying from London, Ontario to San Francisco in June is currently the most expensive (average of $398). 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

Roseville

Mountain View

Santa Cruz

Turlock

Fairfield

South San Francisco

Manteca

Sausalito

Richmond

Watsonville

Hollister

Milpitas

Antioch

Hayward

Vallejo

Newark

Alameda

Campbell

Daly City

Pacific Grove

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$240+ Cheap flights from London, ON (YXU) to San Francisco (SFO)

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 7/1. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from London to San Francisco with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheap flight deals from London to San Francisco

Most accurate provider

Most trusted provider

Round-trip from

Popular in

Cheapest in

Average price

Find flight deals from London to San Francisco

Cheapest flights from London to San FranciscoExplore the most affordable flight options available from London to San Francisco. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 28, 2025.

Explore the most affordable flight options available from London to San Francisco. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 28, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from London to San Francisco that are best for you.

Compare providers for flights from London to San Francisco

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from London to San Francisco in March.

Best time to book a flight from London to San Francisco

Have a flexible travel schedule? Discover the best time to fly to San Francisco from London with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from London to San Francisco

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

Rainfall in San Francisco by month

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

Temperature in San Francisco by month

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

Reviews of airlines servicing San Francisco

Related info for your journey

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

What are the cheapest airlines flying from London, Ontario to San Francisco round-trip?

Can I find deals for flights from London to San Francisco that include hotel bookings?

How can I find direct flights from London to San Francisco?

Can I find deals for business class flights from London to San Francisco?

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

Traveling to a place near London?

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Alternative routes for London to San Francisco

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Travel Smart

Cheapest flights from London to San Francisco
Explore the most affordable flight options available from London to San Francisco. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 28, 2025.