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Cheap flights from London, ON to San Francisco from C$ 301

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 27/10. Fares are subject to change and may not be available on all flights or dates of travel.
YXU — SFO
1 Sep — 8 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 2 August 2026.

Thu 3/96:10 a.m.
YXU
-
SFO
1 stop8h 50m
WestJet
Thu 17/96:00 a.m.
SFO
-
YXU
1 stop7h 45m
WestJet
Deal found 31/7C$ 475
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 31/7C$ 493
Fri 11/96:10 a.m.
YXU
-
SFO
1 stop8h 50m
WestJet
Fri 18/96:00 a.m.
SFO
-
YXU
1 stop7h 45m
WestJet
Deal found 29/7C$ 527
Mon 14/95:55 p.m.
YXU
-
SFO
1 stop21h 05m
WestJet
Mon 21/96:00 a.m.
SFO
-
YXU
1 stop20h 20m
WestJet
Deal found 31/7C$ 534
Thu 19/113:25 p.m.
YXU
-
SFO
1 stop9h 05m
Air Canada
Tue 24/119:00 a.m.
SFO
-
YXU
2 stops9h 52m
Air Canada
Deal found 31/7C$ 545
Thu 8/105:40 a.m.
YXU
-
SFO
1 stop7h 59m
Air Canada
Tue 13/104:35 p.m.
SFO
-
YXU
2 stops13h 45m
Air Canada
Deal found 31/7C$ 546
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 30/7C$ 551
Tue 22/96:10 a.m.
YXU
-
SFO
1 stop8h 50m
WestJet
Sat 26/91:00 p.m.
SFO
-
YXU
1 stop24h 45m
WestJet
Deal found 1/8C$ 587
Tue 22/95:40 a.m.
YXU
-
SFO
2 stops12h 41m
Air Canada
Sat 26/97:30 p.m.
SFO
-
YXU
2 stops19h 13m
Air Canada
Deal found 1/8C$ 594

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 2 August 2026.

Round-trip from

C$ 475

One-way from

C$ 301

Popular in

September

Cheapest in

August

Average price

C$ 259
WestJet
  • WestJet
  • 3/9-17/9
  • 2 total stops
  • 16h 35m total
  • London to San Francisco
Search Deals
Air Canada
  • Air Canada
  • 27/10
  • 1 total stop
  • 9h 25m total
  • London to San Francisco
Search Deals
Highest demand for flights based on searches. 13% potential increase in price (C$ 171 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 11% potential price decrease (C$ 119 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in August 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 2 August 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

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$ 493

LondonSan Francisco

YXU - SFO

YXUSFO

London

Fri 11/9

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

1 stop8h 50m

San Francisco

Fri 18/9

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

1 stop7h 45m

C$ 527

LondonSan Francisco

YXU - SFO

YXUSFO

London

Mon 14/9

5:55 p.m.-12:00 p.m.

1 stop21h 05m

San Francisco

Mon 21/9

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

1 stop20h 20m

C$ 534
Quickest round-trip

LondonSan Francisco

YXU - SFO

YXUSFO

London

Thu 10/9

10:05 a.m.-3:24 p.m.

1 stop8h 19m

San Francisco

Mon 14/9

10:45 p.m.-9:20 a.m.

1 stop7h 35m

C$ 551

LondonSan Francisco

YXU - SFO

YXUSFO

London

Fri 11/9

5:40 a.m.-12:34 p.m.

1 stop9h 54m

San Francisco

Fri 18/9

10:45 p.m.-9:20 a.m.

1 stop7h 35m

C$ 551

LondonSan Francisco

YXU - SFO

YXUSFO

London

Tue 22/9

3:30 p.m.-9:49 p.m.

1 stop9h 19m

San Francisco

Sat 26/9

7:30 p.m.-5:43 p.m.

2 stops19h 13m

C$ 594

LondonSan Francisco

YXU - SFO

YXUSFO

London

Fri 28/8

3:30 p.m.-9:02 p.m.

1 stop8h 32m

San Francisco

Fri 4/9

6:30 p.m.-2:50 p.m.

2 stops17h 20m

C$ 635

LondonSan Francisco

YXU - SFO

YXUSFO

London

Fri 11/9

10:05 a.m.-3:24 p.m.

1 stop8h 19m

San Francisco

Fri 18/9

11:30 p.m.-5:43 p.m.

2 stops15h 13m

C$ 643

LondonSan Francisco

YXU - SFO

YXUSFO

London

Sat 29/8

10:05 a.m.-6:44 p.m.

2 stops11h 39m

San Francisco

Sat 5/9

6:38 p.m.-2:50 p.m.

2 stops17h 12m

C$ 643

LondonSan Francisco

YXU - SFO

YXUSFO

London

Mon 14/9

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

2 stops21h 00m

San Francisco

Mon 21/9

11:30 p.m.-2:50 p.m.

2 stops12h 20m

C$ 643

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/8

Showing 1-10 of 18 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$ 245 and C$ 310 in September.
The cheapest round-trip price found within the last 5 days was C$ 475 on WestJet (3 Sep-17 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 2 August 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
3,423 reviews
Check prices

Entertainment

6.1

Food

6.2

Boarding

7.4

Comfort

7.0

Crew

7.9

Overall

7.2

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
3,423 reviews
WestJet
7.2
Good
3,423 reviews
Check prices

Entertainment

6.1

Food

6.2

Boarding

7.4

Comfort

7.0

Crew

7.9

Overall

7.2

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
11,418 reviews
WestJet
7.2
Good
3,423 reviews
Check prices

Entertainment

6.1

Food

6.2

Boarding

7.4

Comfort

7.0

Crew

7.9

Overall

7.2

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 19m. WestJet provides one of the quickest options available for as low as C$ 551. 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 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

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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 2 August 2026.
AirlineCheapestAverageFlexibilityOn-time
WestJetCheapestC$ 223AverageC$ 447FlexibilityNo cancel feeOn-time60%
Search WestJet flights
Air CanadaCheapestC$ 259AverageC$ 489FlexibilityNo 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.

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