Find flights
When to book
Airlines
FAQs

Cheap flights from London, ON to San Francisco from C$ 247

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 10/9. Fares are subject to change and may not be available on all flights or dates of travel.
YXU — SFO
26 Aug — 2 Sep1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from London to San Francisco

Enter your travel dates to find the best prices.

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 27 July 2026.

Thu 8/106:10 a.m.
YXU
-
SFO
1 stop8h 50m
WestJet
Tue 13/106:00 a.m.
SFO
-
YXU
1 stop20h 20m
WestJet
Deal found 26/7C$ 437
Fri 16/106:10 a.m.
YXU
-
SFO
1 stop8h 50m
WestJet
Tue 20/106:00 a.m.
SFO
-
YXU
1 stop20h 20m
WestJet
Deal found 26/7C$ 438
Thu 10/96:10 a.m.
YXU
-
SFO
1 stop8h 50m
WestJet
Thu 17/96:00 a.m.
SFO
-
YXU
1 stop7h 45m
WestJet
Deal found 27/7C$ 440
Thu 10/96:10 a.m.
YXU
-
SFO
1 stop8h 50m
WestJet
Mon 14/96:00 a.m.
SFO
-
YXU
1 stop7h 45m
WestJet
Deal found 22/7C$ 452
Thu 10/95:40 a.m.
YXU
-
SFO
2 stops12h 41m
Air Canada
Mon 14/96:40 a.m.
SFO
-
YXU
2 stops12h 00m
Air Canada
Deal found 22/7C$ 475
Sun 6/96:10 a.m.
YXU
-
SFO
1 stop8h 50m
WestJet
Sun 13/96:00 a.m.
SFO
-
YXU
1 stop20h 20m
WestJet
Deal found 23/7C$ 482
Tue 8/93:30 p.m.
YXU
-
SFO
2 stops22h 47m
Air Canada
Tue 15/911:35 a.m.
SFO
-
YXU
1 stop7h 05m
Air Canada
Deal found 24/7C$ 516

Find flight deals from London to San Francisco

Discover tips and strategies to find the most affordable flight options for your journey from London (YXU) to San Francisco (SFO). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 27 July 2026.

Round-trip from

C$ 433

One-way from

C$ 247

Popular in

September

Cheapest in

August

Average price

C$ 547
WestJet
  • WestJet
  • 5/9-12/9
  • 2 total stops
  • 22h 10m total
  • London to San Francisco
Search Deals
Air Canada
  • Air Canada
  • 10/9
  • 1 total stop
  • 9h 54m total
  • London to San Francisco
Search Deals
Highest demand for flights based on searches. 13% potential increase in price (C$ 174 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 11% potential price decrease (C$ 120 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from London to San Francisco 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 27 July 2026.
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

Cheapest round-trip

LondonSan Francisco

YXU - SFO

YXUSFO

London

Fri 16/10

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

1 stop8h 50m

San Francisco

Tue 20/10

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

1 stop20h 20m

C$ 438

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$ 454

LondonSan Francisco

YXU - SFO

YXUSFO

London

Thu 10/9

3:30 p.m.-8:59 p.m.

1 stop8h 29m

San Francisco

Mon 14/9

6:40 a.m.-9:40 p.m.

2 stops12h 00m

C$ 475

LondonSan Francisco

YXU - SFO

YXUSFO

London

Fri 9/10

3:30 p.m.-10:51 p.m.

2 stops10h 21m

San Francisco

Mon 12/10

11:30 p.m.-2:55 p.m.

2 stops12h 25m

C$ 575

LondonSan Francisco

YXU - SFO

YXUSFO

London

Thu 20/8

5:40 a.m.-3:35 p.m.

2 stops12h 55m

San Francisco

Thu 27/8

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

1 stop7h 29m

C$ 585

LondonSan Francisco

YXU - SFO

YXUSFO

London

Tue 22/12

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

1 stop9h 10m

San Francisco

Thu 7/1

11:30 p.m.-2:42 p.m.

2 stops12h 12m

C$ 628

LondonSan Francisco

YXU - SFO

YXUSFO

London

Sun 23/8

10:05 a.m.-7:41 a.m.

2 stops24h 36m

San Francisco

Sun 30/8

10:35 p.m.-2:50 p.m.

2 stops13h 15m

C$ 635

LondonSan Francisco

YXU - SFO

YXUSFO

London

Mon 7/9

6:10 a.m.-11:52 a.m.

2 stops32h 42m

San Francisco

Mon 14/9

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

1 stop13h 20m

C$ 676
Quickest round-trip

LondonSan Francisco

YXU - SFO

YXUSFO

London

Tue 8/9

3:30 p.m.-8:59 p.m.

1 stop8h 29m

San Francisco

Tue 15/9

11:35 a.m.-9:40 p.m.

1 stop7h 05m

C$ 682

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

2:15 p.m.-5:20 a.m.

2 stops12h 05m

C$ 696

Flights are sorted by cheapest round-trip flights first.

Deals found on 27/7

Showing 1-10 of 17 resultsSorted by cheapest first
1
2

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

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

Airfare is above average for this route at the moment.

London, Ontario to San Francisco flights typically cost between C$ 247 and C$ 311 in September.
The cheapest round-trip price found within the last 5 days was C$ 433 on WestJet (5 Sep-12 Sep).

Reviews of airlines servicing San Francisco

Get insights into the airlines that provide service to San Francisco. 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 San Francisco. Reviews last updated 27 July 2026.
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
3,415 reviews
Check prices

Comfort

7.0

Overall

7.2

Food

6.2

Crew

7.9

Entertainment

6.1

Boarding

7.4

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
3,415 reviews
WestJet
7.2
Good
3,415 reviews
Check prices

Comfort

7.0

Overall

7.2

Food

6.2

Crew

7.9

Entertainment

6.1

Boarding

7.4

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
11,391 reviews
WestJet
7.2
Good
3,415 reviews
Check prices

Comfort

7.0

Overall

7.2

Food

6.2

Crew

7.9

Entertainment

6.1

Boarding

7.4

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

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.

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

    A quick flight from London, Ontario to San Francisco can take about 8h 29m. WestJet provides one of the quickest options available for as low as C$ 475. 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$ 224), and Air Canada (C$ 260) offers the cheapest pricing from London, Ontario to San Francisco. WestJet is 72% 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

Travelling to a place near San Francisco?

Book flights to San Francisco if you plan to visit one of these locations
Santa Clara
Burlingame
San Bruno
Roseville
Livermore
South San Francisco
Novato
Vallejo

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.
Pearson Intl to Los Angeles flights
Pearson Intl to San Francisco flights
Pearson Intl to Las Vegas flights
Pierre Elliott Trudeau Intl to Los Angeles flights
Pierre Elliott Trudeau Intl to Las Vegas flights
Pearson Intl to Ontario flights
Pearson Intl to San Diego flights
Toronto Island to Las Vegas flights
Pierre Elliott Trudeau Intl to San Francisco flights
Toronto Island to San Francisco flights
Toronto Island to Los Angeles flights
Pearson Intl to San Jose flights
Pierre Elliott Trudeau Intl to Ontario flights
Region of Waterloo Intl to San Francisco flights
Hamilton to San Francisco flights
Region of Waterloo Intl to Las Vegas flights
Region of Waterloo Intl to Los Angeles flights
Toronto Island to San Diego flights
Hamilton to Los Angeles flights
Pierre Elliott Trudeau Intl to San Diego flights
Pearson Intl to Long Beach flights
Hamilton to Las Vegas flights
Ottawa to Las Vegas flights
Pearson Intl to Burbank flights
Pearson Intl to Sacramento flights
Pearson Intl to Santa Ana flights
Ottawa to Los Angeles flights
Pierre Elliott Trudeau Intl to San Jose flights
Pearson Intl to Palm Springs flights
Hamilton to San Diego flights
Ottawa to San Francisco flights
Pearson Intl to Oakland flights
Hamilton to San Jose flights
Pierre Elliott Trudeau Intl to Santa Ana flights
Region of Waterloo Intl to San Diego flights
Hamilton to Ontario flights
Ottawa to Sacramento flights
Pierre Elliott Trudeau Intl to Sacramento flights
Pearson Intl to Fresno flights
London to Los Angeles flights
Ottawa to San Diego flights
Pearson Intl to Redding flights
Pearson Intl to Reno flights
Pierre Elliott Trudeau Intl to Burbank flights
Pearson Intl to Santa Rosa flights
Ottawa to Ontario flights
London to San Diego flights
Region of Waterloo Intl to San Jose flights

Top 2 airlines flying from London to San Francisco

Discover the top 2 airlines that operate flights from London to San Francisco. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 629,999 searches. Data last updated 27 July 2026.
AirlineCheapestAverageFlexibilityOn-time
WestJetCheapestC$ 224AverageC$ 450FlexibilityNo cancel feeOn-time60%
Search WestJet flights
Air CanadaCheapestC$ 260AverageC$ 492FlexibilityNo cancel feeOn-time67%
Search Air Canada flights

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?

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.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.