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Cheap flights from London Heathrow Airport to San Francisco from C$ 668

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 31/5. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SFO
27 Feb — 6 Mar1
1 adult
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from London Heathrow to San Francisco are usually found in February or September, booked 23 days in advance, depart on a Wednesday or Thursday and return on a Friday

Cheap flight deals from Heathrow to San Francisco

Enter your travel dates to find the best prices.

Cheapest flights from Heathrow to San Francisco
Explore the most affordable flight options available from Heathrow to San Francisco. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 28 January 2026.

Mon 16/37:40 a.m.
LHR
-
SFO
1 stop15h 10m
United Airlines
Thu 2/412:00 p.m.
SFO
-
LHR
1 stop14h 10m
United Airlines
Deal found 26/1C$ 696
Tue 28/47:25 a.m.
LHR
-
SFO
1 stop15h 10m
United Airlines
Tue 19/58:10 a.m.
SFO
-
LHR
1 stop18h 00m
United Airlines
Deal found 27/1C$ 697
Thu 16/41:30 p.m.
LHR
-
SFO
1 stop14h 30m
Lufthansa
Tue 21/41:50 p.m.
SFO
-
LHR
1 stop13h 55m
Lufthansa
Deal found 27/1C$ 700
Fri 13/21:30 p.m.
LHR
-
SFO
1 stop14h 40m
United Airlines
Mon 16/25:25 p.m.
SFO
-
LHR
Nonstop10h 35m
United Airlines
Deal found 26/1C$ 701
Tue 22/98:45 a.m.
LHR
-
SFO
1 stop15h 30m
United Airlines
Thu 15/102:05 p.m.
SFO
-
LHR
1 stop13h 45m
United Airlines
Deal found 26/1C$ 703
Fri 20/36:35 a.m.
LHR
-
SFO
1 stop21h 00m
United Airlines
Fri 27/38:52 p.m.
SFO
-
LHR
1 stop31h 28m
United Airlines
Deal found 26/1C$ 704
Fri 13/39:00 a.m.
LHR
-
SFO
1 stop15h 30m
United Airlines
Fri 20/36:25 p.m.
SFO
-
LHR
Nonstop10h 35m
United Airlines
Deal found 27/1C$ 705
Thu 3/99:30 a.m.
LHR
-
SFO
2 stops20h 01m
United Airlines
Thu 10/97:00 a.m.
SFO
-
LHR
1 stop16h 40m
United Airlines
Deal found 26/1C$ 708
Tue 25/812:10 p.m.
LHR
-
SFO
1 stop36h 25m
United Airlines
Sun 13/91:05 p.m.
SFO
-
LHR
Nonstop10h 20m
United Airlines
Deal found 27/1C$ 711
Wed 25/27:40 a.m.
LHR
-
SFO
1 stop15h 10m
Multiple Airlines
Wed 11/38:30 a.m.
SFO
-
LHR
1 stop14h 25m
Multiple Airlines
Deal found 26/1C$ 712
Fri 13/29:30 a.m.
LHR
-
SFO
1 stop14h 25m
United Airlines
Fri 27/210:55 p.m.
SFO
-
LHR
1 stop13h 40m
United Airlines
Deal found 27/1C$ 714

Find flight deals from Heathrow to San Francisco

Discover tips and strategies to find the most affordable flight options for your journey from Heathrow (LHR) 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 28 January 2026.

Round-trip from

C$ 696

One-way from

C$ 668

Popular in

December

Cheapest in

February

Average price

C$ 894

Good round-trip deal

C$ 3,824 or less

Good one-way deal

C$ 3,011 or less
United Airlines
  • United Airlines
  • 16/3-2/4
  • 2 total stops
  • 29h 20m total
  • London to San Francisco
Search Deals
SWISS
  • SWISS
  • 31/5
  • 1 total stop
  • 29h 35m total
  • London to San Francisco
Search Deals
Highest demand for flights based on searches. 4% potential increase in price (C$ 60 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (C$ 36 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
Search Deals
Price to beat on a round-trip flight from London Heathrow to San Francisco.
Search Deals
Price to beat on a one-way flight from London Heathrow to San Francisco.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Heathrow 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 28 January 2026.
Use the filters below to find and compare flights from London Heathrow Airport to San Francisco that are best for you.

Fly from

Heathrow

Fly to

San Francisco

Route

Depart

Return

Price

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Fri 13/2

1:30 p.m.-8:10 p.m.

1 stop14h 40m

San Francisco

Mon 16/2

10:55 p.m.-9:20 p.m.

1 stop14h 25m

C$ 701

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Fri 13/3

9:00 a.m.-5:30 p.m.

1 stop15h 30m

San Francisco

Fri 20/3

6:25 p.m.-12:00 p.m.

Nonstop10h 35m

C$ 707

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Mon 9/2

10:05 a.m.-1:20 p.m.

Nonstop11h 15m

San Francisco

Mon 27/4

12:55 p.m.-7:25 a.m.

Nonstop10h 30m

C$ 718

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Sat 21/2

10:05 a.m.-1:20 p.m.

Nonstop11h 15m

San Francisco

Sun 1/3

4:15 p.m.-1:30 p.m.

1 stop13h 15m

C$ 718

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Sun 8/2

10:05 a.m.-1:20 p.m.

Nonstop11h 15m

San Francisco

Tue 28/4

4:35 p.m.-11:10 a.m.

Nonstop10h 35m

C$ 719

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Mon 9/3

10:05 a.m.-2:20 p.m.

Nonstop11h 15m

San Francisco

Sun 22/3

6:25 p.m.-12:00 p.m.

Nonstop10h 35m

C$ 720

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Fri 20/2

10:05 a.m.-1:20 p.m.

Nonstop11h 15m

San Francisco

Tue 3/3

5:25 p.m.-12:00 p.m.

Nonstop10h 35m

C$ 720

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Thu 26/2

11:35 a.m.-8:10 p.m.

2 stops16h 35m

San Francisco

Thu 5/3

11:14 a.m.-9:40 a.m.

1 stop14h 26m

C$ 727

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Sun 22/3

1:45 p.m.-6:00 p.m.

Nonstop11h 15m

San Francisco

Sun 29/3

4:35 p.m.-11:10 a.m.

Nonstop10h 35m

C$ 739

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Sun 26/4

1:00 p.m.-4:10 p.m.

Nonstop11h 10m

San Francisco

Thu 30/4

4:35 p.m.-11:10 a.m.

Nonstop10h 35m

C$ 742

Flights are sorted by cheapest round-trip flights first.

Deals found on 27/1

Showing 1-10 of 23 results
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Best time to book a flight from Heathrow to San Francisco

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

How far ahead should I book a flight from London Heathrow Airport to San Francisco?

Use this chart to determine the optimal time to book a round-trip flight from Heathrow to San Francisco. Price data was last updated on 23 January 2026.

To ensure you get the cheapest price possible for a flight from London Heathrow Airport to San Francisco, you should look to book at least 23 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

What is the cheapest month to book a flight from London Heathrow Airport to San Francisco?

Currently, February is the cheapest month in which you can book a flight from London Heathrow Airport to San Francisco (average of C$ 648). Flying from London Heathrow Airport to San Francisco in July is currently the most expensive (average of C$ 813). 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.

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

Find hourly flight availability from Heathrow to San Francisco. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 28 January 2026.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from London Heathrow Airport to San Francisco as you normally would.

How much does it cost to fly round-trip from London Heathrow Airport to San Francisco?

Related info for your journey

Find useful and relevant information for your journey from Heathrow 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 airport do you fly into for flights to San Francisco from London Heathrow?

    For a flight from London Heathrow to San Francisco, you will be flying into San Francisco. San Francisco (SFO) is just 19.0 km from the centre of the city. San Francisco is the only San Francisco airport and it handles 29 inbound flights from London Heathrow per day. 0 airlines have flights to San Francisco from London Heathrow on a regular basis.

  • How long is the flight from London Heathrow Airport to San Francisco?

    A quick flight from London Heathrow Airport to San Francisco can take about 15h 10m. United Airlines provides one of the quickest options available for as low as C$ 697. Airlines will cover a distance of 8610 km. Both multi-stop and direct flights can be found to your destination and back.

  • What are the most reliable airlines from London Heathrow Airport to San Francisco?

    Consider KLM (82%), Air France (82%) or Delta (82%) when booking your flight. These represent the most reliable airlines when flying from London Heathrow Airport to San Francisco.

  • What are the cheapest flights from London Heathrow Airport to San Francisco?

    Looking for the cheapest flight from London Heathrow Airport to San Francisco? While on average our users pay C$ 3,417, our data indicates the cheapest price to be C$ 2,953. The most popular route (London Heathrow - San Francisco), is priced around C$ 838.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Heathrow 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 Heathrow Airport to San Francisco?

    Currently, February is the cheapest month in which you can book a flight from London Heathrow Airport to San Francisco (average of C$ 648). Flying from London Heathrow Airport to San Francisco in July is currently the most expensive (average of C$ 813). 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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Can Cheapflights find flights from Heathrow to San Francisco with no change fees?

Yes, we can. To see specific flights from Heathrow to San Francisco with no change fees, users can toggle flexible booking options after using the search form above to find flights.

Can Cheapflights notify me if prices for flights from Heathrow to San Francisco become cheaper?

Yes, Cheapflights offers price alerts on Heathrow to San Francisco flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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