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Cheap flights from London, ON to San Francisco from C$ 251

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 12/2. Fares are subject to change and may not be available on all flights or dates of travel.
YXU — SFO
30 Jan — 6 Feb1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from London to San Francisco

Enter your travel dates to find the best prices.

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 31 December 2025.

Thu 15/15:10 a.m.YXU - SFO
1 stop8h 44mAir Canada
Mon 19/17:30 a.m.SFO - YXU
2 stops10h 50mAir Canada
Deal found 29/12C$ 442
Fri 13/25:10 a.m.YXU - SFO
1 stop8h 44mUnited Airlines
Fri 20/211:59 p.m.SFO - YXU
2 stops18h 22mUnited Airlines
Deal found 29/12C$ 575
Thu 22/15:10 a.m.YXU - SFO
1 stop8h 44mAir Canada
Mon 2/28:30 a.m.SFO - YXU
1 stop9h 50mAir Canada
Deal found 29/12C$ 493

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 31 December 2025.

Round-trip from

C$ 442

One-way from

C$ 251

Popular in

November

Cheapest in

August

Average price

C$ 852
Air Canada
  • Air Canada
  • 15/1-19/1
  • 3 total stops
  • 19h 34m total
  • London to San Francisco
Search Deals
Air Canada
  • Air Canada
  • 12/2
  • 1 total stop
  • 8h 44m total
  • London to San Francisco
Search Deals
Highest demand for flights based on searches. 25% potential increase in price (C$ 257 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 7% potential price decrease (C$ 51 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 31 December 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

Thu 15/1

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

1 stop8h 44m

San Francisco

Mon 19/1

7:30 a.m.-9:20 p.m.

2 stops10h 50m

C$ 442

LondonSan Francisco

YXU - SFO

YXUSFO

London

Thu 22/1

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

1 stop8h 44m

San Francisco

Mon 2/2

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

1 stop9h 50m

C$ 493

LondonSan Francisco

YXU - SFO

YXUSFO

London

Fri 13/2

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

1 stop8h 44m

San Francisco

Fri 20/2

11:59 p.m.-9:21 p.m.

2 stops18h 22m

C$ 575

LondonSan Francisco

YXU - SFO

YXUSFO

London

Thu 12/2

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

1 stop8h 44m

C$ 251

LondonSan Francisco

YXU - SFO

YXUSFO

London

Thu 12/2

5:10 a.m.-11:59 p.m.

2 stops21h 49m

C$ 324

LondonSan Francisco

YXU - SFO

YXUSFO

London

Thu 12/2

8:10 p.m.-5:58 p.m.

3 stops48h 48m

C$ 398

Flights are sorted by cheapest round-trip flights first.

Deals found on 29/12

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$ 197). Flying from London, Ontario to San Francisco in December is currently the most expensive (average of C$ 345). 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 31 December 2025.
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
3,228 reviews
Check prices

Food

6.2

Entertainment

6.1

Boarding

7.4

Crew

7.9

Comfort

7.0

Overall

7.2

Reviews

1 / 20
6.0
Good

Deb,Jan 2025

YYZ - YYC

Boarding went smoothly, you didn't accept debit card for food on flight
WestJet
7.2
Good
3,228 reviews
WestJet
7.2
Good
3,228 reviews
Check prices

Food

6.2

Entertainment

6.1

Boarding

7.4

Crew

7.9

Comfort

7.0

Overall

7.2

Reviews

1 / 20
6.0
Good

Deb,Jan 2025

YYZ - YYC

Boarding went smoothly, you didn't accept debit card for food on flight
Air Canada
7.1
Good
10,571 reviews
WestJet
7.2
Good
3,228 reviews
Check prices

Food

6.2

Entertainment

6.1

Boarding

7.4

Crew

7.9

Comfort

7.0

Overall

7.2

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 44m. Air Canada provides one of the quickest options available for as low as C$ 442. The distance between London, Ontario and San Francisco is about 3508 km.

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

    According to our current data, WestJet (C$ 218), and Air Canada (C$ 253) 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$ 197). Flying from London, Ontario to San Francisco in December is currently the most expensive (average of C$ 345). 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
Burlingame
South San Francisco
Scotts Valley
Novato
Santa Clara
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 31 December 2025.
AirlineCheapestAverageFlexibilityOn-time
WestJetCheapestC$ 240AverageC$ 418FlexibilityNo cancel feeOn-time60%
Search WestJet flights
Air CanadaCheapestC$ 302AverageC$ 469FlexibilityNo 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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