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$142+ Cheap flights from San Francisco (SFO) to London, ON (YXU)

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 6/25. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — YXU
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
1 adult, Economy
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Cheap flight deals from San Francisco to London

Discover tips and strategies to find the most affordable flight options for your journey from San Francisco (SFO) to London (YXU). 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

$296
(Trip.com)

One-way from

$142
(WestJet)

Popular in

December

Cheapest in

March

Average price

$462
From San Francisco to London
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One-way flight from San Francisco to London
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Highest demand for flights based on searches. 20% potential increase in price ($104 potential increase over avg. RT price).
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Cheapest flight prices on average. 10% potential price decrease ($38 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 San Francisco to London

Cheapest flights from San Francisco to London
Explore the most affordable flight options available from San Francisco to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 12, 2025.

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 7/136:05 pmSFO - YXU
1 stop8h 09mWestJet
Sun 7/208:00 pmYXU - SFO
1 stop28h 25mWestJet
Deal found 6/11$296
This Air Canada 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/94:35 pmSFO - YXU
2 stops13h 42mAir Canada
Fri 9/266:15 amYXU - SFO
1 stop9h 43mAir Canada
Deal found 6/10$320
This Kiwi.com deal was found by Cheapflights users on 6/12. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/136:05 pmSFO - YXU
1 stop8h 09mMultiple Airlines
Wed 7/166:00 amYXU - SFO
2 stops29h 00mMultiple Airlines
Deal found 6/12$334
This United Airlines deal was found by Cheapflights users on 6/12. 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.
Sun 7/1311:05 pmSFO - YXU
2 stops12h 57mUnited Airlines
Wed 7/163:40 pmYXU - SFO
2 stops12h 17mUnited Airlines
Deal found 6/12$417

Cheapflights Fare Finder

Customize your flight search to find flights from San Francisco to London 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 San Francisco to London that are best for you.

Fly from

San Francisco

Fly to

London

Route

Depart

Return

Price

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Sun 7/13

6:05 pm-5:14 am

1 stop8h 09m

London

Sun 7/20

8:00 pm-9:25 pm

1 stop28h 25m

$296

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Tue 9/9

4:35 pm-9:17 am

2 stops13h 42m

London

Fri 9/26

6:15 am-12:58 pm

1 stop9h 43m

$320

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Sun 7/13

6:05 pm-5:14 am

1 stop8h 09m

London

Wed 7/16

6:00 am-8:00 am

2 stops29h 00m

$334

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Sun 7/13

11:05 pm-3:02 pm

2 stops12h 57m

London

Wed 7/16

3:40 pm-12:57 am

2 stops12h 17m

$417

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Wed 6/25

2:45 pm-5:14 am

2 stops11h 29m

$142

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Tue 6/24

4:50 pm-9:17 am

1 stop13h 27m

$150

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Thu 6/26

6:55 pm-2:57 pm

2 stops17h 02m

$186

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Thu 6/26

7:30 am-7:09 pm

1 stop8h 39m

$469

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/10

Best time to book a flight from San Francisco to London

Have a flexible travel schedule? Discover the best time to fly to London from San Francisco 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 San Francisco to London

What is the cheapest time of day to fly from SFO to YXU?

Find hourly flight availability from San Francisco to London. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated June 12, 2025.

One of the essential ways to save on airfare from San Francisco to London, Ontario is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. A flight at noon could potentially save you up to 39% on airfare.

Rainfall in London by month

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

In terms of precipitation, rainfall in London, Ontario ranges from 2.8 - 3.9 inches per month. January is typically the wettest month, when rainfall can reach 3.9 in. March is typically the driest time to visit London, Ontario when rainfall is around 2.8 in.

Temperature in London by month

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

If weather is an important factor for your trip to London, Ontario, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 68.0 F. Travelers looking to avoid the cold should look outside of February, when temperatures are typically at their lowest (around 21.2 F).

Reviews of airlines servicing London

Get insights into the airlines that provide service to London. 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 London. Reviews last updated June 12, 2025.
Delta
8.0
Very good
7,946 reviews

Overall

8.0

Food

7.3

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Delta
8.0
Very good
7,946 reviews
Delta
8.0
Very good
7,946 reviews

Overall

8.0

Food

7.3

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
United Airlines
7.4
Good
8,790 reviews
Delta
8.0
Very good
7,946 reviews

Overall

8.0

Food

7.3

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
WestJet
7.2
Good
2,868 reviews
Delta
8.0
Very good
7,946 reviews

Overall

8.0

Food

7.3

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Air Canada
7.1
Good
9,537 reviews
Delta
8.0
Very good
7,946 reviews

Overall

8.0

Food

7.3

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Related info for your journey

Find useful and relevant information for your journey from San Francisco to London. 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 San Francisco to London, Ontario round-trip?

    WestJet, at $296, was found to be the cheapest airline from San Francisco to London, Ontario.Alternate airlines to your destination round-trip include Air Canada and United Airlines. These flights start at 27% lower than the current average price 3 months from now.

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

    One-way options have recently been found by users for as low as $142 on WestJet. Other airlines that offer cheap prices include Air Canada from $150 and United Airlines from $186 one-way.

  • Can I find deals for flights from San Francisco to London that include hotel bookings?

    Yes. In addition to deals on San Francisco to London flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from San Francisco to London?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from San Francisco to London.

  • Can I find deals for business class flights from San Francisco to London?

    Yes. Cheapflights offers flight deals from San Francisco to London 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

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Alternative routes for San Francisco to London

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Top 3 airlines flying from San Francisco to London

Discover the top 3 airlines that operate flights from San Francisco to London. 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 2,558,603 searches. Data last updated June 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$178Average$436FlexibilityNo cancel feeOn-time67%
United AirlinesCheapest$186Average$424FlexibilityNo cancel feeOn-time69%
WestJetCheapest$306Average$491FlexibilityNo cancel feeOn-time60%

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