How long is the flight from London, Ontario to San Francisco?

A quick flight from London, Ontario to San Francisco can take about 8h 50m. WestJet provides one of the quickest options available for as low as C$ 453. The distance between London, Ontario and San Francisco is about 3508 km. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

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

According to our current data, WestJet (C$ 223), and Air Canada (C$ 259) offers the cheapest pricing from London, Ontario to San Francisco. WestJet is 71% cheaper than the average price of flights available within the next 90 days to this destination.

In terms of precipitation, rainfall in San Francisco ranges from 0.0 - 112.0 mm per month. January is typically the wettest month, when rainfall can reach 112.0 mm. July is typically the driest time to visit San Francisco when rainfall is around 0.0 mm.

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 17.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 11.0 C).

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.

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.

C$ 212+ Cheap Flights from London, ON to San Francisco

Q: How much does it cost to fly round-trip from London, Ontario to San Francisco?

Airfare is below average for this route at the moment. London, Ontario to San Francisco flights typically cost between C$ 390 and C$ 449 in August. The cheapest round-trip price found within the last 5 days was C$ 360 on WestJet (19 Aug-26 Aug).

Cheap flight deals from London to San Francisco

Enter your travel dates to find the best prices.

Cheapest

Best

Last-minute

One-way

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 20 July 2026.

Wed 19/86:10 a.m.

YXU

SFO

1 stop8h 50m

WestJet

Wed 26/86:05 p.m.

SFO

YXU

1 stop8h 15m

WestJet

Deal found 17/7C$ 360

Fri 21/82:40 p.m.

YXU

SFO

2 stops10h 15m

WestJet

Sat 29/81:00 p.m.

SFO

YXU

2 stops21h 50m

WestJet

Deal found 18/7C$ 405

Wed 2/96:10 a.m.

YXU

SFO

1 stop8h 50m

WestJet

Wed 9/96:05 p.m.

SFO

YXU

1 stop8h 15m

WestJet

Deal found 19/7C$ 429

Sat 29/86:10 a.m.

YXU

SFO

1 stop18h 45m

WestJet

Sat 5/96:05 p.m.

SFO

YXU

1 stop8h 15m

WestJet

Deal found 15/7C$ 470

Thu 10/95:55 p.m.

YXU

SFO

1 stop21h 05m

WestJet

Mon 14/96:00 a.m.

SFO

YXU

1 stop7h 45m

WestJet

Deal found 18/7C$ 512

Thu 10/95:40 a.m.

YXU

SFO

2 stops12h 41m

Air Canada

Mon 14/94:30 p.m.

SFO

YXU

2 stops22h 13m

Air Canada

Deal found 19/7C$ 519

Wed 25/115:30 a.m.

YXU

SFO

1 stop8h 40m

Air Canada

Mon 7/125:35 p.m.

SFO

YXU

2 stops12h 02m

Air Canada

Deal found 17/7C$ 534

Sun 30/82:40 p.m.

YXU

SFO

2 stops10h 15m

WestJet

Sun 6/96:05 p.m.

SFO

YXU

1 stop8h 15m

WestJet

Deal found 16/7C$ 558

Find flight deals from London to San Francisco

Round-trip from	C$ 360
One-way from	C$ 212
Popular in	September
Cheapest in	August
Average price	C$ 544

WestJet
19/8-26/8
2 total stops
17h 05m total
London to San Francisco

Search Deals

WestJet
18/8
2 total stops
10h 15m total
London to San Francisco

Search Deals

Highest demand for flights based on searches. 15% potential increase in price (C$ 203 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 12% potential price decrease (C$ 122 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in July 2026

Search Deals

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

LondonSan Francisco

YXU - SFO

YXUSFO

London

Thu 10/9

6:10 a.m.-12:00 p.m.

1 stop8h 50m

San Francisco

Mon 14/9

6:00 a.m.-4:45 p.m.

1 stop7h 45m

C$ 453

LondonSan Francisco

YXU - SFO

YXUSFO

London

Thu 10/9

5:40 a.m.-3:21 p.m.

2 stops12h 41m

San Francisco

Mon 14/9

4:30 p.m.-5:43 p.m.

2 stops22h 13m

C$ 519

LondonSan Francisco

YXU - SFO

YXUSFO

London

Sun 30/8

2:40 p.m.-9:55 p.m.

2 stops10h 15m

San Francisco

Sun 6/9

6:05 p.m.-5:20 a.m.

1 stop8h 15m

C$ 558

LondonSan Francisco

YXU - SFO

YXUSFO

London

Thu 8/10

6:10 a.m.-12:00 p.m.

1 stop8h 50m

San Francisco

Tue 13/10

6:00 a.m.-5:20 a.m.

1 stop20h 20m

C$ 569

LondonSan Francisco

YXU - SFO

YXUSFO

London

Fri 21/8

6:10 a.m.-9:55 p.m.

1 stop18h 45m

San Francisco

Sat 29/8

6:00 a.m.-4:45 p.m.

1 stop7h 45m

C$ 571

LondonSan Francisco

YXU - SFO

YXUSFO

London

Fri 4/9

2:40 p.m.-9:55 p.m.

2 stops10h 15m

San Francisco

Tue 8/9

1:00 p.m.-5:20 a.m.

1 stop13h 20m

C$ 583

LondonSan Francisco

YXU - SFO

YXUSFO

London

Sat 28/11

3:25 p.m.-9:30 p.m.

1 stop9h 05m

San Francisco

Tue 8/12

2:00 p.m.-8:37 a.m.

1 stop15h 37m

C$ 585

LondonSan Francisco

YXU - SFO

YXUSFO

London

Sat 28/11

9:15 a.m.-3:40 p.m.

1 stop9h 25m

San Francisco

Fri 4/12

4:40 p.m.-8:37 a.m.

1 stop12h 57m

C$ 585

LondonSan Francisco

YXU - SFO

YXUSFO

London

Tue 1/12

3:20 p.m.-9:30 p.m.

1 stop9h 10m

San Francisco

Fri 4/12

4:40 p.m.-8:37 a.m.

1 stop12h 57m

C$ 585

Quickest round-trip

LondonSan Francisco

YXU - SFO

YXUSFO

London

Tue 1/9

10:05 a.m.-3:27 p.m.

1 stop8h 22m

San Francisco

Tue 8/9

10:51 p.m.-9:20 a.m.

1 stop7h 29m

C$ 655

Flights are sorted by cheapest round-trip flights first.

Deals found on 15/7

Showing 1-10 of 19 resultsSorted by cheapest first

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.

YXU-SFO

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

How much does it cost to fly round-trip from London, Ontario to San Francisco?

Reviews of airlines servicing San Francisco

Read through reviews of airlines operating flights from London to San Francisco, such as WestJet and Air Canada. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

WestJet

7.2

Good

3,412 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Anonymous,Dec 2023

YYC - PSP

Can never get the influential entertainment to work on the app. Super disappointing.

WestJet

7.2

Good

3,412 reviews

WestJet

7.2

Good

3,412 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Anonymous,Dec 2023

YYC - PSP

Can never get the influential entertainment to work on the app. Super disappointing.

Air Canada

7.1

Good

11,361 reviews

WestJet

7.2

Good

3,412 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Anonymous,Dec 2023

YYC - PSP

Can never get the influential entertainment to work on the app. Super disappointing.

Related info for your journey

How long is the flight from London, Ontario to San Francisco?
A quick flight from London, Ontario to San Francisco can take about 8h 50m. WestJet provides one of the quickest options available for as low as C$ 453. The distance between London, Ontario and San Francisco is about 3508 km. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.
What are the cheapest airlines flying from London, Ontario to San Francisco round-trip?
According to our current data, WestJet (C$ 223), and Air Canada (C$ 259) offers the cheapest pricing from London, Ontario to San Francisco. WestJet is 71% cheaper than the average price of flights available within the next 90 days to this destination.
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.

See more FAQs

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Top 2 airlines flying from London to San Francisco

Airline	Cheapest	Average	Flexibility	On-time
WestJet	CheapestC$ 223	AverageC$ 448	FlexibilityNo cancel fee	On-time60%	Search WestJet flights
Air Canada	CheapestC$ 259	AverageC$ 851	FlexibilityNo cancel fee	On-time67%	Search Air Canada flights

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Cheap flights from London, ON to San Francisco from C$ 212

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 18/8. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap 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 20 July 2026.

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 20 July 2026.

Best flights from London to San FranciscoDiscover 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 20 July 2026.

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 20 July 2026.

Last-minute flights from London to San FranciscoDiscover last-minute flight deals from London to San Francisco. Data last updated 20 July 2026 and is based on user searches.

Discover last-minute flight deals from London to San Francisco. Data last updated 20 July 2026 and is based on user searches.

One-way flights from London to San FranciscoSearch for one-way flight options from London to San Francisco. Find affordable one-way fares based on user searches. Data last updated 20 July 2026.

Search for one-way flight options from London to San Francisco. Find affordable one-way fares based on user searches. Data last updated 20 July 2026.

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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

How much does it cost to fly round-trip from London, Ontario to San Francisco?

Reviews of airlines servicing San Francisco

Read through reviews of airlines operating flights from London to San Francisco, such as WestJet and Air Canada. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

How long is the flight from London, Ontario to San Francisco?

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?

Travelling to a place near San Francisco?

Browse thousands of different options on Cheapflights for your next trip

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Complete your trip

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Direct flights to California

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Search flights from London to San Francisco by cabin class

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London and San Francisco flights

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Other flights from London

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Top 2 airlines flying from London to San Francisco

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How does Cheapflights help users find flights from London to San Francisco?

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Can Cheapflights find flights from London to San Francisco with no change fees?

Can Cheapflights notify me if prices for flights from London to San Francisco become cheaper?

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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 20 July 2026.

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 20 July 2026.

Last-minute flights from London to San Francisco
Discover last-minute flight deals from London to San Francisco. Data last updated 20 July 2026 and is based on user searches.

One-way flights from London to San Francisco
Search for one-way flight options from London to San Francisco. Find affordable one-way fares based on user searches. Data last updated 20 July 2026.