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$366+ Cheap flights from San Francisco (SFO) to London, ON (YXU)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 8/6. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — YXU
Jun 28 — Jul 51
Sat 6/28
Sat 7/5
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 23, 2025.

Round-trip from

$366
(oojo)

Popular in

December

Cheapest in

March

Average price

$439
From San Francisco to London
Search Deals
Highest demand for flights based on searches. 21% potential increase in price ($108 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 10% potential price decrease ($39 potential savings vs. average RT price).
Search Deals
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 23, 2025.

This oojo deal was found by Cheapflights users on 6/22. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/66:05 pmSFO - YXU
1 stop8h 09mWestJet
Wed 8/136:00 amYXU - SFO
1 stop18h 25mWestJet
Deal found 6/22$366
This Air Canada deal was found by Cheapflights users on 6/21. 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 8/51:55 pmSFO - YXU
1 stop16h 22mAir Canada
Tue 8/123:40 pmYXU - SFO
1 stop8h 13mAir Canada
Deal found 6/21$410
This Kiwi.com deal was found by Cheapflights users on 6/21. 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.
Tue 8/510:15 amSFO - YXU
1 stop31h 45mMultiple Airlines
Tue 8/126:00 amYXU - SFO
2 stops19h 40mMultiple Airlines
Deal found 6/21$445
This United Airlines deal was found by Cheapflights users on 6/21. 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 8/412:20 amSFO - YXU
2 stops11h 42mUnited Airlines
Tue 8/123:40 pmYXU - SFO
1 stop8h 13mUnited Airlines
Deal found 6/21$513

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 23, 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

Wed 8/6

6:05 pm-5:14 am

1 stop8h 09m

London

Wed 8/13

6:00 am-9:25 pm

1 stop18h 25m

$366

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Tue 8/5

1:55 pm-9:17 am

1 stop16h 22m

London

Tue 8/12

3:40 pm-8:53 pm

1 stop8h 13m

$410

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Tue 8/5

10:15 am-9:00 pm

1 stop31h 45m

London

Tue 8/12

6:00 am-10:40 pm

2 stops19h 40m

$445

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Mon 8/4

12:20 am-3:02 pm

2 stops11h 42m

London

Tue 8/12

3:40 pm-8:53 pm

1 stop8h 13m

$513

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Tue 7/29

12:50 pm-5:14 am

1 stop13h 24m

$562

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Tue 7/29

11:25 pm-5:07 pm

2 stops14h 42m

$607

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Tue 7/29

3:48 pm-5:14 am

3 stops34h 26m

$837

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/22

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 23, 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 23, 2025.
United Airlines
7.4
Good
8,831 reviews

Boarding

7.7

Entertainment

7.0

Overall

7.4

Crew

8.1

Comfort

7.3

Food

6.6

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
United Airlines
7.4
Good
8,831 reviews
United Airlines
7.4
Good
8,831 reviews

Boarding

7.7

Entertainment

7.0

Overall

7.4

Crew

8.1

Comfort

7.3

Food

6.6

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
WestJet
7.2
Good
2,887 reviews
United Airlines
7.4
Good
8,831 reviews

Boarding

7.7

Entertainment

7.0

Overall

7.4

Crew

8.1

Comfort

7.3

Food

6.6

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
Air Canada
7.1
Good
9,604 reviews
United Airlines
7.4
Good
8,831 reviews

Boarding

7.7

Entertainment

7.0

Overall

7.4

Crew

8.1

Comfort

7.3

Food

6.6

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??

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 $366, 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 9% lower than the current average price 3 months from now.

  • 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 23, 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$178Average$436FlexibilityNo cancel feeOn-time67%
United AirlinesCheapest$186Average$424FlexibilityNo cancel feeOn-time69%
WestJetCheapest$306Average$496FlexibilityNo cancel feeOn-time60%

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