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$171+ Cheap flights from London, ON (YXU) to San Francisco (SFO)

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 6/17. Fares are subject to change and may not be available on all flights or dates of travel.
YXU — SFO
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
1 adult, Economy
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Cheap 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 June 12, 2025.

Round-trip from

$263
(Air Canada)

One-way from

$171
(Air Canada)

Popular in

December

Cheapest in

May

Average price

$297
From London to San Francisco
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One-way flight from London to San Francisco
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Highest demand for flights based on searches. 24% potential increase in price ($134 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease ($21 potential savings vs. average RT price).
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Average for round-trip flights in June 2025
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Find flight deals from London to San Francisco

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 June 12, 2025.

This Air Canada deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/263:35 pmYXU - SFO
1 stop8h 18mAir Canada
Tue 10/2810:45 pmSFO - YXU
1 stop7h 20mAir Canada
Deal found 6/11$263
This Trip.com deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 6/298:00 pmYXU - SFO
1 stop19h 05mWestJet
Sat 7/52:45 pmSFO - YXU
2 stops11h 29mWestJet
Deal found 6/11$278
This Mytrip deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/309:45 pmYXU - SFO
1 stop14h 45mMultiple Airlines
Sat 7/52:45 pmSFO - YXU
2 stops11h 29mMultiple Airlines
Deal found 6/11$312
This United Airlines deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/293:35 pmYXU - SFO
1 stop8h 57mUnited Airlines
Tue 10/1412:43 amSFO - YXU
2 stops11h 14mUnited Airlines
Deal found 6/10$330
This Delta deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/66:00 amYXU - SFO
1 stop9h 05mDelta
Wed 7/3010:55 amSFO - YXU
2 stops15h 19mDelta
Deal found 6/10$587
This Lufthansa deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/39:55 amYXU - SFO
2 stops36h 25mLufthansa
Fri 10/244:05 pmSFO - YXU
2 stops26h 22mLufthansa
Deal found 6/11$11,759
This SWISS deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/273:35 pmYXU - SFO
2 stops27h 35mSWISS
Tue 10/288:25 pmSFO - YXU
2 stops46h 20mSWISS
Deal found 6/11$11,844

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 2,558,603 searches. Data last updated June 12, 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

Fri 9/26

3:35 pm-8:53 pm

1 stop8h 18m

San Francisco

Tue 10/28

10:45 pm-9:05 am

1 stop7h 20m

$263

LondonSan Francisco

YXU - SFO

YXUSFO

London

Sun 6/29

8:00 pm-12:05 pm

1 stop19h 05m

San Francisco

Sat 7/5

2:45 pm-5:14 am

2 stops11h 29m

$278

LondonSan Francisco

YXU - SFO

YXUSFO

London

Mon 6/30

9:45 pm-9:30 am

1 stop14h 45m

San Francisco

Sat 7/5

2:45 pm-5:14 am

2 stops11h 29m

$312

LondonSan Francisco

YXU - SFO

YXUSFO

London

Mon 9/29

3:35 pm-9:32 pm

1 stop8h 57m

San Francisco

Tue 10/14

12:43 am-2:57 pm

2 stops11h 14m

$330

LondonSan Francisco

YXU - SFO

YXUSFO

London

Sun 7/6

6:00 am-12:05 pm

1 stop9h 05m

San Francisco

Wed 7/30

10:55 am-5:14 am

2 stops15h 19m

$587

LondonSan Francisco

YXU - SFO

YXUSFO

London

Fri 10/3

3:35 pm-7:20 pm

2 stops30h 45m

San Francisco

Thu 10/23

4:05 pm-2:57 pm

2 stops43h 52m

$11,759

LondonSan Francisco

YXU - SFO

YXUSFO

London

Sat 9/27

3:35 pm-4:10 pm

2 stops27h 35m

San Francisco

Tue 10/28

8:25 pm-9:45 pm

2 stops46h 20m

$11,844

LondonSan Francisco

YXU - SFO

YXUSFO

London

Tue 6/17

3:35 pm-10:02 pm

1 stop9h 27m

$171

LondonSan Francisco

YXU - SFO

YXUSFO

London

Tue 7/15

8:00 pm-9:25 pm

1 stop28h 25m

$178

LondonSan Francisco

YXU - SFO

YXUSFO

London

Tue 7/1

6:00 am-11:50 pm

2 stops20h 50m

$191

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/10

Showing 1-10 of 11 results
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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, January is the cheapest month in which you can book a flight from London, Ontario to San Francisco (average of $276). Flying from London, Ontario to San Francisco in June is currently the most expensive (average of $364). 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.

Rainfall in San Francisco by month

Plan your trip to San Francisco by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in San Francisco ranges from 0.0 - 4.4 inches per month. January is typically the wettest month, when rainfall can reach 4.4 in. July is typically the driest time to visit San Francisco when rainfall is around 0.0 in.

Temperature in San Francisco by month

Plan your trip to San Francisco by taking into account the average temperature totals by month.

If weather is an important factor for your trip to San Francisco, use this chart to help with planning. For those seeking warmer temperatures, September is the ideal time of year to visit, when temperatures reach an average of 62.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 51.8 F).

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 June 12, 2025.
Delta
8.0
Very good
7,950 reviews

Food

7.3

Boarding

8.2

Comfort

7.9

Overall

8.0

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Delta
8.0
Very good
7,950 reviews
Delta
8.0
Very good
7,950 reviews

Food

7.3

Boarding

8.2

Comfort

7.9

Overall

8.0

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
SWISS
7.5
Good
1,623 reviews
Delta
8.0
Very good
7,950 reviews

Food

7.3

Boarding

8.2

Comfort

7.9

Overall

8.0

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
United Airlines
7.4
Good
8,790 reviews
Delta
8.0
Very good
7,950 reviews

Food

7.3

Boarding

8.2

Comfort

7.9

Overall

8.0

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
WestJet
7.2
Good
2,868 reviews
Delta
8.0
Very good
7,950 reviews

Food

7.3

Boarding

8.2

Comfort

7.9

Overall

8.0

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Air Canada
7.1
Good
9,531 reviews
Delta
8.0
Very good
7,950 reviews

Food

7.3

Boarding

8.2

Comfort

7.9

Overall

8.0

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

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.

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

    Air Canada, at $263, was found to be the cheapest airline from London, Ontario to San Francisco.Alternate airlines to your destination round-trip include WestJet and United Airlines. Air Canada is currently priced 37% below the average price you’ll pay for this route.

  • What are the cheapest airlines to fly from London, Ontario to San Francisco one-way?

    The cheapest airline one-way is Air Canada, with whom users have recently found tickets for as low as $171. However, be on the lookout for offers from WestJet and United Airlines, as they are both options that can get you from London, Ontario to San Francisco for a low price.

  • 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, January is the cheapest month in which you can book a flight from London, Ontario to San Francisco (average of $276). Flying from London, Ontario to San Francisco in June is currently the most expensive (average of $364). 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

Traveling to a place near London?

Book flights to London if you plan to visit one of these locations
Roseville
Mountain View
South San Francisco
Livermore
Turlock
Santa Cruz
Manteca
Fairfield
Watsonville
Antioch
Hollister
Milpitas
Newark
Hayward
Alameda
Sunnyvale
Daly City
Union City
Campbell
Capitola

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