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Cheap flights from London, ON to San Francisco from C$ 266

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 25/1. Fares are subject to change and may not be available on all flights or dates of travel.
YXU — SFO
11 ene. — 18 ene.1
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 12 diciembre 2025.

dom. 21/125:10 a.m.YXU - SFO
2 stops15h 40mUnited Airlines
jue. 1/15:00 a.m.SFO - YXU
2 stops13h 21mUnited Airlines
Deal found 9/12C$ 956
vie. 19/129:25 a.m.YXU - SFO
1 stop9h 00mAir Canada
mar. 30/128:50 p.m.SFO - YXU
2 stops17h 15mAir Canada
Deal found 9/12C$ 1,003
vie. 19/129:25 a.m.YXU - SFO
1 stop9h 00mAir Canada
jue. 1/18:49 a.m.SFO - YXU
1 stop9h 32mAir Canada
Deal found 9/12C$ 1,004
sáb. 20/129:25 a.m.YXU - SFO
2 stops16h 30mUnited Airlines
jue. 1/15:00 a.m.SFO - YXU
2 stops13h 21mUnited Airlines
Deal found 9/12C$ 1,009
dom. 21/125:10 a.m.YXU - SFO
2 stops17h 44mUnited Airlines
lun. 29/1211:05 p.m.SFO - YXU
2 stops15h 00mUnited Airlines
Deal found 9/12C$ 1,029
mar. 16/125:10 a.m.YXU - SFO
1 stop8h 44mUnited Airlines
jue. 1/15:00 a.m.SFO - YXU
2 stops13h 21mUnited Airlines
Deal found 9/12C$ 1,065
mar. 16/125:10 a.m.YXU - SFO
1 stop8h 44mAir Canada
mié. 31/128:49 a.m.SFO - YXU
1 stop9h 32mAir Canada
Deal found 9/12C$ 1,067
mié. 17/125:10 a.m.YXU - SFO
2 stops15h 40mUnited Airlines
mar. 30/128:50 p.m.SFO - YXU
2 stops17h 15mUnited Airlines
Deal found 9/12C$ 1,073

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 12 diciembre 2025.

Round-trip from

C$ 476

One-way from

C$ 266

Popular in

November

Cheapest in

August

Average price

C$ 858
22/1-2/2
  • 22/1-2/2
  • 3 total stops
  • 49h 55m total
  • London to San Francisco
Search Deals
25/1
  • 25/1
  • 2 total stops
  • 28h 48m total
  • London to San Francisco
Search Deals
Highest demand for flights based on searches. 25% potential increase in price (C$ 260 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 7% potential price decrease (C$ 53 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
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 12 diciembre 2025.
Use the filters below to find and compare flights from London to San Francisco that are best for you.

Fly from

London

Fly to

San Francisco

Route

Depart

Return

Price

LondonSan Francisco

YXU - SFO

YXUSFO

London

jue. 22/1

5:10 a.m.-10:54 a.m.

1 stop8h 44m

San Francisco

lun. 2/2

8:30 a.m.-9:20 p.m.

1 stop9h 50m

C$ 539

LondonSan Francisco

YXU - SFO

YXUSFO

London

jue. 22/1

9:50 a.m.-7:09 p.m.

2 stops12h 19m

San Francisco

lun. 2/2

7:00 a.m.-9:20 p.m.

2 stops11h 20m

C$ 571

LondonSan Francisco

YXU - SFO

YXUSFO

London

dom. 11/1

5:40 p.m.-12:20 p.m.

2 stops21h 40m

San Francisco

mar. 13/1

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

2 stops11h 46m

C$ 703

LondonSan Francisco

YXU - SFO

YXUSFO

London

lun. 22/12

5:10 a.m.-7:54 p.m.

2 stops17h 44m

San Francisco

jue. 1/1

5:00 a.m.-9:21 p.m.

2 stops13h 21m

C$ 956

LondonSan Francisco

YXU - SFO

YXUSFO

London

dom. 21/12

5:10 a.m.-5:36 p.m.

2 stops15h 26m

San Francisco

mar. 30/12

8:50 p.m.-5:05 p.m.

2 stops17h 15m

C$ 956

LondonSan Francisco

YXU - SFO

YXUSFO

London

lun. 22/12

5:10 a.m.-5:50 p.m.

2 stops15h 40m

San Francisco

mar. 30/12

8:50 p.m.-5:05 p.m.

2 stops17h 15m

C$ 956

LondonSan Francisco

YXU - SFO

YXUSFO

London

dom. 21/12

5:10 a.m.-7:16 p.m.

2 stops17h 06m

San Francisco

mié. 31/12

5:00 a.m.-9:21 p.m.

2 stops13h 21m

C$ 956

LondonSan Francisco

YXU - SFO

YXUSFO

London

dom. 25/1

8:10 p.m.-9:58 p.m.

2 stops28h 48m

C$ 266

LondonSan Francisco

YXU - SFO

YXUSFO

London

sáb. 24/1

5:10 a.m.-10:50 a.m.

1 stop8h 40m

C$ 273

LondonSan Francisco

YXU - SFO

YXUSFO

London

dom. 25/1

9:50 a.m.-9:39 p.m.

1 stop14h 49m

C$ 487

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/12

Showing 1-10 of 11 results
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, April is the cheapest month in which you can book a flight from London, Ontario to San Francisco (average of C$ 199). Flying from London, Ontario to San Francisco in January is currently the most expensive (average of C$ 332). 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.

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 12 diciembre 2025.
Read through reviews of airlines operating flights from London to San Francisco, such as United Airlines,WestJet, andAir Canada. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
9,095 reviews
Check prices

Comfort

7.3

Boarding

7.7

Food

6.6

Crew

8.1

Entertainment

7.1

Overall

7.4

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

FRA - SFO

Lufthansa was amazing, I wish United States based airlines operated like them.
United Airlines
7.4
Good
9,095 reviews
United Airlines
7.4
Good
9,095 reviews
Check prices

Comfort

7.3

Boarding

7.7

Food

6.6

Crew

8.1

Entertainment

7.1

Overall

7.4

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

FRA - SFO

Lufthansa was amazing, I wish United States based airlines operated like them.
WestJet
7.2
Good
3,195 reviews
United Airlines
7.4
Good
9,095 reviews
Check prices

Comfort

7.3

Boarding

7.7

Food

6.6

Crew

8.1

Entertainment

7.1

Overall

7.4

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

FRA - SFO

Lufthansa was amazing, I wish United States based airlines operated like them.
Air Canada
7.1
Good
10,516 reviews
United Airlines
7.4
Good
9,095 reviews
Check prices

Comfort

7.3

Boarding

7.7

Food

6.6

Crew

8.1

Entertainment

7.1

Overall

7.4

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

FRA - SFO

Lufthansa was amazing, I wish United States based airlines operated like them.

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 44m. Air Canada provides one of the quickest options available for as low as C$ 539. 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$ 220), Air Canada (C$ 255), and United Airlines (C$ 348) offers the cheapest pricing from London, Ontario to San Francisco. WestJet is 61% 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, April is the cheapest month in which you can book a flight from London, Ontario to San Francisco (average of C$ 199). Flying from London, Ontario to San Francisco in January is currently the most expensive (average of C$ 332). 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
Richmond
Newark
Redwood City
Burlingame
South San Francisco
Scotts Valley
Novato
Santa Clara
Vallejo

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Top 3 airlines flying from London to San Francisco

Discover the top 3 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 12 diciembre 2025.
AirlineCheapestAverageFlexibilityOn-time
WestJetCheapestC$ 242AverageC$ 421FlexibilityNo cancel feeOn-time60%
Search WestJet flights
Air CanadaCheapestC$ 304AverageC$ 472FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapestC$ 348AverageC$ 737FlexibilityNo cancel feeOn-time69%
Search United Airlines 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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