Find flights
Deals
When to book
FAQs

Cheap flights from London Heathrow Airport to San Francisco from C$ 681

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 8/5. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SFO
11 Jan — 18 Jan1
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 45 days in advance, depart on a Tuesday or Wednesday and return on a Monday

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 12 December 2025.

Thu 25/127:55 p.m.LHR - SFO
1 stop28h 10mTAP AIR PORTUGAL
Mon 19/14:35 p.m.SFO - LHR
1 stop16h 55mTAP AIR PORTUGAL
Deal found 10/12C$ 939
Sat 13/126:00 a.m.LHR - SFO
1 stop16h 45mTAP AIR PORTUGAL
Sat 10/14:35 p.m.SFO - LHR
1 stop16h 55mTAP AIR PORTUGAL
Deal found 10/12C$ 949
Wed 24/129:00 a.m.LHR - SFO
1 stop15h 30mUnited Airlines
Mon 19/112:50 p.m.SFO - LHR
Nonstop10h 35mUnited Airlines
Deal found 10/12C$ 965
Thu 25/126:40 a.m.LHR - SFO
1 stop15h 55mScandinavian Airlines
Sun 11/14:40 p.m.SFO - LHR
1 stop15h 20mScandinavian Airlines
Deal found 10/12C$ 967
Wed 24/129:00 a.m.LHR - SFO
1 stop15h 30mUnited Airlines
Sun 18/110:50 p.m.SFO - LHR
1 stop14h 30mUnited Airlines
Deal found 10/12C$ 979
Thu 25/126:00 a.m.LHR - SFO
1 stop18h 30mSWISS
Wed 28/111:45 a.m.SFO - LHR
2 stops20h 35mSWISS
Deal found 10/12C$ 994
Wed 24/126:40 p.m.LHR - SFO
1 stop29h 50mSWISS
Fri 16/17:25 p.m.SFO - LHR
1 stop15h 50mSWISS
Deal found 10/12C$ 1,004
Tue 23/126:30 p.m.LHR - SFO
1 stop28h 00mTAP AIR PORTUGAL
Sat 17/14:35 p.m.SFO - LHR
1 stop16h 55mTAP AIR PORTUGAL
Deal found 10/12C$ 1,012
Wed 24/126:30 a.m.LHR - SFO
1 stop14h 10mLufthansa
Sun 18/112:50 p.m.SFO - LHR
Nonstop10h 35mLufthansa
Deal found 10/12C$ 1,016
Thu 25/129:00 a.m.LHR - SFO
1 stop15h 30mUnited Airlines
Mon 19/112:50 p.m.SFO - LHR
Nonstop10h 35mUnited Airlines
Deal found 10/12C$ 1,021
Wed 24/129:00 a.m.LHR - SFO
1 stop15h 30mUnited Airlines
Tue 6/19:30 p.m.SFO - LHR
1 stop15h 50mUnited Airlines
Deal found 10/12C$ 1,029

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 12 December 2025.

Round-trip from

C$ 870

One-way from

C$ 681

Popular in

July

Cheapest in

February

Average price

C$ 1,183

Good round-trip deal

C$ 1,650 or less

Good one-way deal

C$ 2,964 or less
Scandinavian Airlines
  • Scandinavian Airlines
  • 13/4-27/4
  • 2 total stops
  • 33h 45m total
  • London to San Francisco
Search Deals
United Airlines
  • United Airlines
  • 8/5
  • 1 total stop
  • 14h 35m total
  • London to San Francisco
Search Deals
Highest demand for flights based on searches. 13% potential increase in price (C$ 198 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (C$ 33 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
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 12 December 2025.
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

Tue 26/5

6:10 a.m.-4:10 p.m.

1 stop18h 00m

San Francisco

Tue 2/6

4:35 p.m.-11:00 a.m.

Nonstop10h 25m

C$ 936

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Sat 30/5

6:15 a.m.-4:10 p.m.

1 stop17h 55m

San Francisco

Tue 2/6

4:35 p.m.-11:00 a.m.

Nonstop10h 25m

C$ 936

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Thu 28/5

6:15 a.m.-4:10 p.m.

1 stop17h 55m

San Francisco

Sun 7/6

11:07 p.m.-6:50 a.m.

1 stop23h 43m

C$ 936

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Tue 26/5

6:10 a.m.-4:10 p.m.

1 stop18h 00m

San Francisco

Wed 3/6

10:45 p.m.-9:40 p.m.

1 stop14h 55m

C$ 936

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Thu 28/5

6:15 a.m.-4:10 p.m.

1 stop17h 55m

San Francisco

Thu 4/6

4:23 p.m.-3:05 p.m.

1 stop14h 42m

C$ 936

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Tue 26/5

6:10 a.m.-4:10 p.m.

1 stop18h 00m

San Francisco

Thu 4/6

4:23 p.m.-3:05 p.m.

1 stop14h 42m

C$ 936

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Tue 26/5

6:10 a.m.-4:10 p.m.

1 stop18h 00m

San Francisco

Sun 7/6

4:23 p.m.-3:05 p.m.

1 stop14h 42m

C$ 936

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Sat 30/5

6:15 a.m.-4:10 p.m.

1 stop17h 55m

San Francisco

Fri 5/6

4:23 p.m.-3:05 p.m.

1 stop14h 42m

C$ 936

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Mon 13/4

9:00 a.m.-7:00 p.m.

1 stop18h 00m

San Francisco

Sat 25/4

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

Nonstop10h 30m

C$ 941

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Wed 27/5

6:30 a.m.-11:45 a.m.

1 stop13h 15m

San Francisco

Tue 2/6

4:15 p.m.-2:00 p.m.

1 stop13h 45m

C$ 949

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/12

Showing 1-10 of 20 results
1
2

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 5 December 2025.

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 45 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$ 656). Flying from London Heathrow Airport to San Francisco in July is currently the most expensive (average of C$ 840). 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 12 December 2025.

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.

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 31 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 18h. British Airways provides one of the quickest options available for as low as C$ 936. Airlines will cover a distance of 8610 km.

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

    Consider Air New Zealand (85%), KLM (84%) or Air France (83%) 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$ 2,832, our data indicates the cheapest price to be C$ 1,417. The most popular route (London Heathrow - San Francisco), is priced around C$ 845.

  • 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$ 656). Flying from London Heathrow Airport to San Francisco in July is currently the most expensive (average of C$ 840). 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
Redwood City
Burlingame
South San Francisco
Scotts Valley
Novato
Santa Clara
Vallejo

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Heathrow to San Francisco?

Cheapflights makes it easy to find Heathrow to San Francisco flights by helping our users search from 900+ travel sites for deals. We also provide you with filters for cabin, price, airline, airports, number of stops, and many more to narrow down that perfect flight.

Why should you use Cheapflights to find cheap flight tickets from Heathrow to San Francisco?

Millions of users choose and trust Cheapflights to book the best flight deals from Heathrow to San Francisco for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

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.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.