Cheap flights from London, ON to San Francisco from C$ 300

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 17/5. Fares are subject to change and may not be available on all flights or dates of travel.
YXU — SFO
2 May — 9 May1
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 April 2026.

Thu 18/66:10 a.m.
YXU
-
SFO
1 stop8h 50m
WestJet
Mon 22/66:00 a.m.
SFO
-
YXU
1 stop7h 45m
WestJet
Deal found 31/3C$ 451
Thu 7/56:10 a.m.
YXU
-
SFO
1 stop18h 45m
WestJet
Tue 12/56:00 a.m.
SFO
-
YXU
1 stop7h 45m
WestJet
Deal found 28/3C$ 454
Tue 14/48:00 a.m.
YXU
-
SFO
1 stop31h 05m
WestJet
Tue 5/56:00 a.m.
SFO
-
YXU
1 stop7h 45m
WestJet
Deal found 30/3C$ 461
Fri 8/56:10 a.m.
YXU
-
SFO
1 stop8h 50m
WestJet
Tue 12/56:00 a.m.
SFO
-
YXU
1 stop7h 45m
WestJet
Deal found 29/3C$ 472
Thu 18/66:10 a.m.
YXU
-
SFO
1 stop8h 50m
WestJet
Mon 29/66:00 a.m.
SFO
-
YXU
1 stop7h 45m
WestJet
Deal found 31/3C$ 476
Wed 15/45:10 a.m.
YXU
-
SFO
1 stop8h 45m
Air Canada
Tue 5/58:05 a.m.
SFO
-
YXU
2 stops10h 33m
Air Canada
Deal found 1/4C$ 495
Thu 9/76:10 a.m.
YXU
-
SFO
1 stop8h 50m
WestJet
Wed 29/76:05 p.m.
SFO
-
YXU
1 stop8h 15m
WestJet
Deal found 1/4C$ 501
Sun 31/55:55 p.m.
YXU
-
SFO
1 stop21h 05m
WestJet
Tue 7/76:05 p.m.
SFO
-
YXU
1 stop8h 15m
WestJet
Deal found 1/4C$ 510
Wed 15/45:10 a.m.
YXU
-
SFO
1 stop8h 45m
Air Canada
Mon 4/57:30 p.m.
SFO
-
YXU
2 stops23h 08m
Air Canada
Deal found 1/4C$ 524
Thu 16/49:25 a.m.
YXU
-
SFO
1 stop15h 05m
Air Canada
Tue 5/58:05 a.m.
SFO
-
YXU
2 stops10h 33m
Air Canada
Deal found 1/4C$ 528

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 April 2026.

Round-trip from

C$ 451

One-way from

C$ 300

Popular in

March

Cheapest in

August

Average price

C$ 432
WestJet
  • WestJet
  • 18/6-22/6
  • 2 total stops
  • 16h 35m total
  • London to San Francisco
WestJet
  • WestJet
  • 17/5
  • 1 total stop
  • 18h 45m total
  • London to San Francisco
Highest demand for flights based on searches. 27% potential increase in price (C$ 293 potential increase over avg. RT price).
Cheapest flight prices on average. 11% potential price decrease (C$ 79 potential savings vs. average RT price).
Average for round-trip flights in April 2026

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 April 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

Sun 31/5

2:40 p.m.-12:00 p.m.

2 stops24h 20m

San Francisco

Tue 7/7

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

1 stop8h 15m

C$ 520

LondonSan Francisco

YXU - SFO

YXUSFO

London

Fri 8/5

6:10 p.m.-11:25 a.m.

2 stops20h 15m

San Francisco

Tue 12/5

7:30 p.m.-11:43 a.m.

2 stops13h 13m

C$ 557

LondonSan Francisco

YXU - SFO

YXUSFO

London

Tue 14/4

5:10 a.m.-10:55 a.m.

1 stop8h 45m

San Francisco

Tue 5/5

6:30 a.m.-9:38 p.m.

2 stops12h 08m

C$ 579

LondonSan Francisco

YXU - SFO

YXUSFO

London

Wed 15/4

5:10 a.m.-10:55 a.m.

1 stop8h 45m

San Francisco

Fri 8/5

9:08 p.m.-5:33 p.m.

2 stops17h 25m

C$ 579
Quickest round-trip

LondonSan Francisco

YXU - SFO

YXUSFO

London

Fri 8/5

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

1 stop8h 50m

San Francisco

Tue 12/5

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

1 stop7h 45m

C$ 589

LondonSan Francisco

YXU - SFO

YXUSFO

London

Thu 16/4

9:25 a.m.-8:09 p.m.

1 stop13h 44m

San Francisco

Wed 6/5

5:30 a.m.-9:38 p.m.

2 stops13h 08m

C$ 620

LondonSan Francisco

YXU - SFO

YXUSFO

London

Wed 29/4

5:10 a.m.-1:25 p.m.

1 stop11h 15m

San Francisco

Wed 6/5

5:30 a.m.-9:38 p.m.

2 stops13h 08m

C$ 628

LondonSan Francisco

YXU - SFO

YXUSFO

London

Thu 16/4

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

1 stop15h 05m

San Francisco

Sun 19/4

12:45 a.m.-5:04 p.m.

2 stops13h 19m

C$ 635
Cheapest one-way
Quickest one-way

LondonSan Francisco

YXU - SFO

YXUSFO

London

Sun 17/5

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

1 stop18h 45m

C$ 300

LondonSan Francisco

YXU - SFO

YXUSFO

London

Fri 15/5

5:55 p.m.-9:55 p.m.

1 stop31h 00m

C$ 342

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/4

Showing 1-10 of 11 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

What is the cheapest month to book a flight from London, Ontario to San Francisco?

Currently, August is the cheapest month in which you can book a flight from London, Ontario to San Francisco (average of C$ 221). Flying from London, Ontario to San Francisco in December is currently the most expensive (average of C$ 351). 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.

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

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 April 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.

Overall

7.2

Crew

7.9

Food

6.2

Boarding

7.4

Comfort

7.0

Entertainment

6.1

Reviews

1 / 20
6.0
Good

Deb,Jan 2025

YYZ - YYC

Boarding went smoothly, you didn't accept debit card for food on flight

Overall

7.2

Crew

7.9

Food

6.2

Boarding

7.4

Comfort

7.0

Entertainment

6.1

Reviews

1 / 20
6.0
Good

Deb,Jan 2025

YYZ - YYC

Boarding went smoothly, you didn't accept debit card for food on flight

Overall

7.2

Crew

7.9

Food

6.2

Boarding

7.4

Comfort

7.0

Entertainment

6.1

Reviews

1 / 20
6.0
Good

Deb,Jan 2025

YYZ - YYC

Boarding went smoothly, you didn't accept debit card for food on flight

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 45m. WestJet provides one of the quickest options available for as low as C$ 579. 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$ 221), and Air Canada (C$ 256) offers the cheapest pricing from London, Ontario to San Francisco. WestJet is 60% 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, August is the cheapest month in which you can book a flight from London, Ontario to San Francisco (average of C$ 221). Flying from London, Ontario to San Francisco in December is currently the most expensive (average of C$ 351). 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

Travelling to a place near San Francisco?

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

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for London to San Francisco

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

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 April 2026.
AirlineCheapestAverageFlexibilityOn-time
WestJetCheapestC$ 221AverageC$ 424FlexibilityNo cancel feeOn-time60%
Search WestJet flights
Air CanadaCheapestC$ 256AverageC$ 476FlexibilityNo cancel feeOn-time67%
Search Air Canada flights

Fly with Cheapflights

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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.

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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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