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

According to our current data, WestJet (C$ 380), Air Canada (C$ 442), and Delta (C$ 546) offers the cheapest pricing from London, Ontario to San Francisco. WestJet is 34% cheaper than the average price of flights available within the next 90 days to this destination.

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 Saturday mornings when fares are most often at their lowest. Friday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

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 are the most popular airlines that fly from London, Ontario to San Francisco?

Consider Air Canada, United Airlines or WestJet when booking your flight. These represent the most popular airlines when flying from London, Ontario to San Francisco.

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

Leaving on a Friday is a viable option for saving on travel. Heavily demanded days of the week can typically drive up the prices you see. Booking your travel for a less competitive day can save up to 32% on the overall cost on flights from London, Ontario to San Francisco.

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

The best pricing can be found in the month of May. Prices to San Francisco from London, Ontario average C$ 580. You can even find prices in May for less than C$ 580, as users have found deals to San Francisco from as low as C$ 303. The month of December appears to be one of the more expensive times to travel to San Francisco from London, Ontario. Flying in the targeted month can save you up to 52%.

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$ 202+ Flights from London, ON to San Francisco

Cheap flight deals from London to San Francisco

Round-trip from	C$ 380
One-way from	C$ 202
Popular in	December
Cheapest in	May
Average price	C$ 611

WestJet
16/8-23/8
3 total stops
20h 25m total
London to San Francisco

Search Deals

WestJet
17/8
1 total stop
8h 56m total
London to San Francisco

Search Deals

Highest demand for flights based on searches. 23% potential increase in price (C$ 241 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 5% potential price decrease (C$ 40 potential savings vs. average RT price).

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Average for round-trip flights in July 2025

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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 3 July 2025.

Sat 16/86:00 a.m.YXU - SFO

1 stop8h 56mWestJet

Sat 23/82:45 p.m.SFO - YXU

2 stops11h 29mWestJet

Deal found 2/7C$ 380

Wed 10/129:25 a.m.YXU - SFO

1 stop8h 50mAir Canada

Wed 7/16:00 p.m.SFO - YXU

2 stops11h 46mAir Canada

Deal found 2/7C$ 442

Sat 11/106:00 a.m.YXU - SFO

1 stop8h 54mDelta

Fri 17/107:30 a.m.SFO - YXU

1 stop8h 37mDelta

Deal found 1/7C$ 546

Sun 14/125:45 a.m.YXU - SFO

1 stop8h 14mUnited Airlines

Wed 31/1212:32 a.m.SFO - YXU

2 stops13h 34mUnited Airlines

Deal found 2/7C$ 557

Sat 16/86:00 a.m.YXU - SFO

2 stops10h 59mMultiple Airlines

Sat 23/810:15 a.m.SFO - YXU

3 stops15h 59mMultiple Airlines

Deal found 2/7C$ 635

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 3 July 2025.

Sat 16/86:00 a.m.YXU - SFO

1 stop8h 56mWestJet

Sat 23/82:45 p.m.SFO - YXU

2 stops11h 29mWestJet

Deal found 2/7C$ 380

Wed 10/129:25 a.m.YXU - SFO

1 stop8h 50mAir Canada

Wed 7/16:00 p.m.SFO - YXU

2 stops11h 46mAir Canada

Deal found 2/7C$ 442

Sat 11/106:00 a.m.YXU - SFO

1 stop8h 54mDelta

Fri 17/107:30 a.m.SFO - YXU

1 stop8h 37mDelta

Deal found 1/7C$ 546

Sun 14/125:45 a.m.YXU - SFO

1 stop8h 14mUnited Airlines

Wed 31/1212:32 a.m.SFO - YXU

2 stops13h 34mUnited Airlines

Deal found 2/7C$ 557

Sat 16/86:00 a.m.YXU - SFO

2 stops10h 59mMultiple Airlines

Sat 23/810:15 a.m.SFO - YXU

3 stops15h 59mMultiple Airlines

Deal found 2/7C$ 635

Last-minute flights from London to San Francisco
Discover last-minute flight deals from London to San Francisco. Data last updated 3 July 2025 and is based on user searches.

Sat 16/86:00 a.m.YXU - SFO

1 stop8h 56mWestJet

Sat 23/82:45 p.m.SFO - YXU

2 stops11h 29mWestJet

Deal found 2/7C$ 380

Sat 16/86:00 a.m.YXU - SFO

2 stops10h 59mMultiple Airlines

Sat 23/810:15 a.m.SFO - YXU

3 stops15h 59mMultiple Airlines

Deal found 2/7C$ 635

Sat 16/83:40 p.m.YXU - SFO

2 stops10h 30mUnited Airlines

Fri 22/812:43 a.m.SFO - YXU

2 stops17h 44mUnited Airlines

Deal found 2/7C$ 741

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 3 July 2025.

Sun 17/86:00 a.m.YXU - SFO

1 stop8h 56mWestJet

Deal found 3/7C$ 202

Fri 15/89:45 p.m.YXU - SFO

3 stops26h 40mMultiple Airlines

Deal found 1/7C$ 371

Sat 16/86:15 a.m.YXU - SFO

3 stops19h 23mUnited Airlines

Deal found 2/7C$ 2,884

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

Sat 16/8

6:00 a.m.-11:56 a.m.

1 stop8h 56m

San Francisco

Sat 23/8

2:45 p.m.-5:14 a.m.

2 stops11h 29m

C$ 380

LondonSan Francisco

YXU - SFO

YXUSFO

London

Wed 10/12

9:25 a.m.-3:15 p.m.

1 stop8h 50m

San Francisco

Wed 7/1

6:00 p.m.-8:46 a.m.

2 stops11h 46m

C$ 442

LondonSan Francisco

YXU - SFO

YXUSFO

London

Sat 11/10

6:00 a.m.-11:54 a.m.

1 stop8h 54m

San Francisco

Fri 17/10

7:30 a.m.-7:07 p.m.

1 stop8h 37m

C$ 546

LondonSan Francisco

YXU - SFO

YXUSFO

London

Sun 14/12

5:45 a.m.-10:59 a.m.

1 stop8h 14m

San Francisco

Wed 31/12

12:32 a.m.-5:06 p.m.

2 stops13h 34m

C$ 557

LondonSan Francisco

YXU - SFO

YXUSFO

London

Sat 16/8

6:00 a.m.-1:59 p.m.

2 stops10h 59m

San Francisco

Sat 23/8

10:15 a.m.-5:14 a.m.

3 stops15h 59m

C$ 635

LondonSan Francisco

YXU - SFO

YXUSFO

London

Sun 17/8

6:00 a.m.-11:56 a.m.

1 stop8h 56m

C$ 202

LondonSan Francisco

YXU - SFO

YXUSFO

London

Fri 15/8

9:45 p.m.-9:25 p.m.

3 stops26h 40m

C$ 371

LondonSan Francisco

YXU - SFO

YXUSFO

London

Sat 16/8

6:15 a.m.-10:38 p.m.

3 stops19h 23m

C$ 2,884

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/7

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 C$ 276). Flying from London, Ontario to San Francisco in December is currently the most expensive (average of C$ 368). 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 YXU to SFO?

When flying from London, Ontario to San Francisco, the time of day you fly usually plays a role in the price. Save by searching for a flight at noon, which can drop the price by up to 20% versus a flight in the afternoon.

Reviews of airlines servicing San Francisco

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

Delta

8.0

Very good

7,982 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Delta

8.0

Very good

7,982 reviews

Delta

8.0

Very good

7,982 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

United Airlines

7.4

Good

8,861 reviews

Delta

8.0

Very good

7,982 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

WestJet

7.2

Good

2,917 reviews

Delta

8.0

Very good

7,982 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Air Canada

7.1

Good

9,681 reviews

Delta

8.0

Very good

7,982 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Related info for your journey

What are the cheapest airlines flying from London, Ontario to San Francisco round-trip?
According to our current data, WestJet (C$ 380), Air Canada (C$ 442), and Delta (C$ 546) offers the cheapest pricing from London, Ontario to San Francisco. WestJet is 34% 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.
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 C$ 276). Flying from London, Ontario to San Francisco in December is currently the most expensive (average of C$ 368). 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

Richmond

San Ramon

Newark

Alameda

Redwood City

Burlingame

San Bruno

South San Francisco

Scotts Valley

Novato

Belmont

Millbrae

Santa Clara

Vallejo

Browse thousands of different options on Cheapflights for your next trip

Top 3 airlines flying from London to San Francisco

Airline	Cheapest	Average	Flexibility	On-time
WestJet	CheapestC$ 274	AverageC$ 447	FlexibilityNo cancel fee	On-time60%	Search WestJet flights
United Airlines	CheapestC$ 343	AverageC$ 622	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights
Air Canada	CheapestC$ 361	AverageC$ 609	FlexibilityNo cancel fee	On-time67%	Search Air Canada flights

Fly with Cheapflights

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

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from London to San Francisco. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

Why should you use Cheapflights to find cheap flight tickets from London to San Francisco?

It’s simple! Cheapflights, which is free to use for everyone, saves millions of users time and money every year by helping them find the cheapest and most suitable flights from London to San Francisco.

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

Users can book flights with no change fees policies with our dedicated filters. Book flights from London to San Francisco flexibly with Cheapflights today.

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

Of course! You can now track prices for flights from London to San Francisco and get an alert from Cheapflights when they change. Have a valid email address ready and click the bell icon next to the flight deals above to set up your price alerts.

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Cheap flights from London, ON to San Francisco from C$ 202

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 17/8. 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

Round-trip from

One-way 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 3 July 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 3 July 2025.

Cheapflights Fare Finder

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

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?

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

Find hourly flight availability from London to San Francisco. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 3 July 2025.

Reviews of airlines servicing San Francisco

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

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?

Travelling to a place near 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 London to San Francisco

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

Top 3 airlines flying from London to San Francisco

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

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

Why should you use Cheapflights to find cheap flight tickets from London to San Francisco?

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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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 3 July 2025.