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

A quick flight from San Francisco to London, Ontario can take about 14h 38m. Air Canada provides one of the quickest options available for as low as $382. The distance from San Francisco to London, Ontario is about 2180 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

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

Air Canada, at $358, was found to be the cheapest airline from San Francisco to London, Ontario. An alternate airline flying to your destination would be WestJet.

In terms of precipitation, rainfall in London, Ontario ranges from 2.8 - 3.9 inches per month. January is typically the wettest month, when rainfall can reach 3.9 in. March is typically the driest time to visit London, Ontario when rainfall is around 2.8 in.

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 68.0 F. Travelers looking to avoid the cold should look outside of February, when temperatures are typically at their lowest (around 21.2 F).

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

When flying from San Francisco 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.

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

Most trusted provider : When it comes to deals on San Francisco-London, Ontario 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 San Francisco-London, Ontario 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 San Francisco to London that include hotel bookings?

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

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

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

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

Yes. Cheapflights offers flight deals from San Francisco 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.

$188+ Cheap Flights from San Francisco to London, ON

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Cheap flight deals from San Francisco to London

Cheapest

Best

Last-minute

One-way

Cheapest flights from San Francisco to London
Explore the most affordable flight options available from San Francisco to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 25, 2026.

Wed 9/1612:05 am -

1 stop14h 38m

Thu 9/243:30 pm -

1 stop8h 29m

Deal found 8/24

$382

Fri 9/256:00 am -

1 stop20h 20m

Mon 9/285:55 pm -

1 stop21h 05m

Deal found 8/23

$388

Thu 9/176:00 am -

1 stop20h 20m

Thu 9/246:10 am -

1 stop18h 45m

Deal found 8/21

$402

Fri 11/64:40 pm -

1 stop9h 55m

Mon 11/96:40 am -

1 stop12h 10m

Deal found 8/22

$406

Fri 9/256:00 am -

1 stop20h 20m

Mon 9/286:10 am -

2 stops12h 36m

Deal found 8/23

$447

Tue 10/2011:35 am -

1 stop7h 05m

Thu 10/225:40 am -

1 stop8h 04m

Deal found 8/20

$456

Tue 10/206:00 am -

1 stop20h 20m

Thu 10/226:10 am -

1 stop8h 50m

Deal found 8/24

$470

Best flights from San Francisco to London
Discover carefully curated flight deals from San Francisco to London that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 25, 2026.

Fri 11/64:40 pm -

1 stop9h 55m

Mon 11/96:40 am -

1 stop12h 10m

Deal found 8/25

$382

Thu 9/1712:50 pm -

2 stops17h 30m

Thu 9/243:30 pm -

1 stop8h 29m

Deal found 8/21

$443

Tue 10/2011:35 am -

1 stop7h 05m

Thu 10/225:40 am -

1 stop8h 04m

Deal found 8/22

$456

Tue 10/206:00 am -

1 stop20h 20m

Thu 10/226:10 am -

1 stop8h 50m

Deal found 8/24

$470

Last-minute flights from San Francisco to London
Discover last-minute flight deals from San Francisco to London. Data last updated August 25, 2026 and is based on user searches.

Wed 9/1612:05 am -

1 stop14h 38m

Thu 9/243:30 pm -

1 stop8h 29m

Deal found 8/24

$382

Wed 9/166:05 pm -

1 stop8h 15m

Sun 9/206:10 am -

2 stops12h 36m

Deal found 8/23

$513

Wed 9/166:05 pm -

1 stop8h 15m

Sun 9/206:10 am -

1 stop8h 50m

Deal found 8/23

$560

Thu 9/176:00 am -

1 stop20h 20m

Thu 9/246:10 am -

1 stop18h 45m

Deal found 8/21

$402

Fri 9/256:00 am -

1 stop20h 20m

Mon 9/285:55 pm -

1 stop21h 05m

Deal found 8/23

$388

Fri 9/256:00 am -

1 stop20h 20m

Mon 9/286:10 am -

2 stops12h 36m

Deal found 8/23

$447

Find flight deals from San Francisco to London

Most accurate provider	FlightHub 3 stars
Most trusted provider	FlightHub 3 stars
Round-trip from	$382 (Air Canada)
One-way from	$188 (Air Canada)

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

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

Search Deals

From San Francisco to London

Search Deals

One-way flight from San Francisco to London

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Cheapflights Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

San FranciscoLondon

SFO San Francisco - YXU London

SFOYXU

San Francisco

Fri 11/6

4:40 pm-5:35 am

1 stop9h 55m

London

Mon 11/9

6:40 am-3:50 pm

1 stop12h 10m

$382

San FranciscoLondon

SFO San Francisco - YXU London

SFOYXU

San Francisco

Thu 9/17

12:50 pm-9:20 am

2 stops17h 30m

London

Thu 9/24

3:30 pm-8:59 pm

1 stop8h 29m

$443

Quickest round-trip

San FranciscoLondon

SFO San Francisco - YXU London

SFOYXU

San Francisco

Tue 10/20

11:35 am-9:40 pm

1 stop7h 05m

London

Thu 10/22

5:40 am-10:44 am

1 stop8h 04m

$456

San FranciscoLondon

SFO San Francisco - YXU London

SFOYXU

San Francisco

Tue 10/20

6:00 am-5:20 am

1 stop20h 20m

London

Thu 10/22

6:10 am-12:00 pm

1 stop8h 50m

$470

Cheapest one-way

Quickest one-way

San FranciscoLondon

SFO San Francisco - YXU London

SFOYXU

San Francisco

Sat 10/10

8:10 am-9:40 pm

2 stops10h 30m

$188

San FranciscoLondon

SFO San Francisco - YXU London

SFOYXU

San Francisco

Sat 10/10

1:00 pm-4:45 pm

1 stop24h 45m

$209

San FranciscoLondon

SFO San Francisco - YXU London

SFOYXU

San Francisco

Sat 10/10

7:11 pm-5:20 am

3 stops31h 09m

$316

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/25

Sorted by cheapest first

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

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

SFO-YXU

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.

Reviews of airlines servicing London

Read through reviews of airlines operating flights from San Francisco to London, 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

3,438 reviews

Reviews

1 / 20

10.0

Excellent

Brian,Aug 2023

SFO - YYC

Great experience on WestJet from SFO to YYC. (My experience at YYC wasn't as good, but that's for another review) The gate area is spacious, with lots of seating and electrical power. Boarding was pretty seamless, aircraft was in excellent shape, great crew, good food (in Business), and smooth flight. I wouldn't hesitate to take WestJet in/out of SFO again.

WestJet

7.2

Good

3,438 reviews

WestJet

7.2

Good

3,438 reviews

Reviews

1 / 20

10.0

Excellent

Brian,Aug 2023

SFO - YYC

Air Canada

7.1

Good

11,531 reviews

WestJet

7.2

Good

3,438 reviews

Reviews

1 / 20

10.0

Excellent

Brian,Aug 2023

SFO - YYC

Related info for your journey

How long is the flight from San Francisco to London, Ontario?
A quick flight from San Francisco to London, Ontario can take about 14h 38m. Air Canada provides one of the quickest options available for as low as $382. The distance from San Francisco to London, Ontario is about 2180 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.
What are the cheapest airlines flying from San Francisco to London, Ontario round-trip?
Air Canada, at $358, was found to be the cheapest airline from San Francisco to London, Ontario. An alternate airline flying to your destination would be WestJet.
Can I find deals for flights from San Francisco to London that include hotel bookings?
Yes. In addition to deals on San Francisco to London flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from San Francisco to London?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from San Francisco to London.
Can I find deals for business class flights from San Francisco to London?
Yes. Cheapflights offers flight deals from San Francisco 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.

See more FAQs

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Top 2 airlines flying from San Francisco to London

Airline	Cheapest	Average	Flexibility	On-time
Air Canada	Cheapest$358	Average$674	FlexibilityNo cancel fee	On-time67%
WestJet	Cheapest$366	Average$660	FlexibilityNo cancel fee	On-time60%

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$188+ Cheap flights from San Francisco (SFO) to London, ON (YXU)

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 10/10. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from San Francisco to London with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheap flight deals from San Francisco to London

Cheapest flights from San Francisco to LondonExplore the most affordable flight options available from San Francisco to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 25, 2026.

Explore the most affordable flight options available from San Francisco to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 25, 2026.

Best flights from San Francisco to LondonDiscover carefully curated flight deals from San Francisco to London that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 25, 2026.

Discover carefully curated flight deals from San Francisco to London that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 25, 2026.

Last-minute flights from San Francisco to LondonDiscover last-minute flight deals from San Francisco to London. Data last updated August 25, 2026 and is based on user searches.

Discover last-minute flight deals from San Francisco to London. Data last updated August 25, 2026 and is based on user searches.

One-way flights from San Francisco to LondonSearch for one-way flight options from San Francisco to London. Find affordable one-way fares based on user searches. Data last updated August 25, 2026.

Search for one-way flight options from San Francisco to London. Find affordable one-way fares based on user searches. Data last updated August 25, 2026.

Find flight deals from San Francisco to London

Most accurate provider

Most trusted provider

Round-trip from

One-way from

Cheapflights Fare Finder

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

Best time to book a flight from San Francisco to London

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

Reviews of airlines servicing London

Read through reviews of airlines operating flights from San Francisco to London, 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 San Francisco to London, Ontario?

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

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

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

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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for San Francisco to London

See prices for flight routes from nearby airports that may be better suited for you.

Complete your trip

Complete your trip to London by adding a car rental and/or hotel reservation to your travel itinerary.

Search flights from San Francisco to London by cabin class

Find flights from San Francisco to London, based on your preferred cabin class, be it economy, premium economy, business, or first class.

Other flights to London

Explore flights to London departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on August 25, 2026.

San Francisco and London flights

Browse other San Francisco and London flight options. Last updated on August 25, 2026.

Other flights from San Francisco

Browse through other flights departing from San Francisco. Flights are based on user searches made on Cheapflights and were last updated on August 25, 2026.

Popular flight searches

Check out other popular destinations found by fellow travelers in 2026

Top 2 airlines flying from San Francisco to London

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Travel Smart

Cheapest flights from San Francisco to London
Explore the most affordable flight options available from San Francisco to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 25, 2026.

Best flights from San Francisco to London
Discover carefully curated flight deals from San Francisco to London that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 25, 2026.

Last-minute flights from San Francisco to London
Discover last-minute flight deals from San Francisco to London. Data last updated August 25, 2026 and is based on user searches.

One-way flights from San Francisco to London
Search for one-way flight options from San Francisco to London. Find affordable one-way fares based on user searches. Data last updated August 25, 2026.