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Cheap flights from London Heathrow Airport to San Francisco from C$ 643

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 7/1. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SFO
27 Nov — 4 Dec1
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 82 days in advance, depart on a Tuesday or Wednesday and return on a Wednesday

Cheap 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 October 2025.

Round-trip from

C$ 713

One-way from

C$ 643

Popular in

July

Cheapest in

February

Average price

C$ 943

Good round-trip deal

C$ 1,486 or less

Good one-way deal

C$ 621 or less
TAP AIR PORTUGAL
  • TAP AIR PORTUGAL
  • 7/11-17/11
  • 2 total stops
  • 45h 10m total
  • London to San Francisco
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United Airlines
  • United Airlines
  • 7/1
  • 2 total stops
  • 19h 00m total
  • London to San Francisco
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Highest demand for flights based on searches. 14% potential increase in price (C$ 221 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease (C$ 36 potential savings vs. average RT price).
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Average for round-trip flights in October 2025
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Price to beat on a round-trip flight from London Heathrow to San Francisco.
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Price to beat on a one-way flight from London Heathrow to San Francisco.
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Find 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 October 2025.

Fri 7/116:30 p.m.LHR - SFO
1 stop28h 15mTAP AIR PORTUGAL
Mon 17/114:35 p.m.SFO - LHR
1 stop16h 55mTAP AIR PORTUGAL
Deal found 26/10C$ 713
Sat 6/123:35 p.m.LHR - SFO
2 stops31h 00mScandinavian Airlines
Mon 12/14:40 p.m.SFO - LHR
2 stops18h 10mScandinavian Airlines
Deal found 27/10C$ 814
Sat 22/113:35 p.m.LHR - SFO
2 stops31h 00mScandinavian Airlines
Sun 30/114:40 p.m.SFO - LHR
2 stops18h 10mScandinavian Airlines
Deal found 27/10C$ 818
Wed 12/117:30 p.m.LHR - SFO
1 stop27h 05mScandinavian Airlines
Mon 8/124:40 p.m.SFO - LHR
1 stop15h 20mScandinavian Airlines
Deal found 27/10C$ 821
Thu 13/117:30 p.m.LHR - SFO
1 stop27h 05mScandinavian Airlines
Sun 7/124:40 p.m.SFO - LHR
1 stop15h 20mScandinavian Airlines
Deal found 28/10C$ 824
Wed 12/1110:35 a.m.LHR - SFO
2 stops36h 00mScandinavian Airlines
Sun 7/124:40 p.m.SFO - LHR
1 stop15h 20mScandinavian Airlines
Deal found 27/10C$ 827
Wed 10/1210:35 a.m.LHR - SFO
2 stops36h 00mScandinavian Airlines
Fri 16/14:40 p.m.SFO - LHR
1 stop15h 20mScandinavian Airlines
Deal found 28/10C$ 828
Thu 4/129:05 p.m.LHR - SFO
2 stops25h 30mScandinavian Airlines
Mon 8/124:40 p.m.SFO - LHR
1 stop15h 20mScandinavian Airlines
Deal found 27/10C$ 831
Sat 22/113:35 p.m.LHR - SFO
2 stops31h 00mScandinavian Airlines
Fri 28/114:40 p.m.SFO - LHR
2 stops17h 50mScandinavian Airlines
Deal found 28/10C$ 834
Fri 28/116:40 a.m.LHR - SFO
1 stop15h 55mScandinavian Airlines
Fri 5/124:40 p.m.SFO - LHR
2 stops32h 15mScandinavian Airlines
Deal found 26/10C$ 841
Sat 22/113:35 p.m.LHR - SFO
2 stops31h 00mScandinavian Airlines
Sat 18/44:45 p.m.SFO - LHR
2 stops15h 40mScandinavian Airlines
Deal found 27/10C$ 842
Sat 22/113:35 p.m.LHR - SFO
2 stops31h 00mScandinavian Airlines
Fri 17/44:45 p.m.SFO - LHR
2 stops15h 40mScandinavian Airlines
Deal found 27/10C$ 846

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 October 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

Thu 4/12

9:05 p.m.-2:35 p.m.

2 stops25h 30m

San Francisco

Mon 8/12

4:40 p.m.-6:50 p.m.

2 stops18h 10m

C$ 821

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Tue 25/11

9:00 a.m.-4:30 p.m.

1 stop15h 30m

San Francisco

Mon 1/12

12:43 a.m.-7:30 a.m.

1 stop22h 47m

C$ 863

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Mon 24/11

9:00 a.m.-4:30 p.m.

1 stop15h 30m

San Francisco

Tue 9/12

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

Nonstop10h 35m

C$ 866

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Mon 17/11

9:00 a.m.-4:30 p.m.

1 stop15h 30m

San Francisco

Mon 1/12

1:28 p.m.-11:15 a.m.

1 stop13h 47m

C$ 919

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Wed 10/12

6:30 a.m.-11:50 a.m.

1 stop13h 20m

San Francisco

Tue 16/12

10:30 p.m.-7:50 a.m.

1 stop25h 20m

C$ 925

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Wed 4/2

9:00 a.m.-4:30 p.m.

1 stop15h 30m

San Francisco

Sat 28/2

12:50 p.m.-7:25 a.m.

Nonstop10h 35m

C$ 925

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Mon 15/12

6:30 a.m.-11:50 a.m.

1 stop13h 20m

San Francisco

Wed 7/1

12:47 a.m.-7:05 a.m.

1 stop22h 18m

C$ 929

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Mon 2/3

6:30 a.m.-11:50 a.m.

1 stop13h 20m

San Francisco

Mon 9/3

12:40 a.m.-7:05 a.m.

1 stop23h 25m

C$ 929

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Tue 18/11

11:40 a.m.-2:40 p.m.

Nonstop11h 00m

San Francisco

Tue 2/12

4:30 p.m.-10:40 a.m.

Nonstop10h 10m

C$ 937

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Sat 6/12

3:35 p.m.-2:35 p.m.

2 stops31h 00m

San Francisco

Tue 9/12

3:35 p.m.-5:40 p.m.

2 stops18h 05m

C$ 947

Flights are sorted by cheapest round-trip flights first.

Deals found on 27/10

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 24 October 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 82 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, December is the cheapest month in which you can book a flight from London Heathrow Airport to San Francisco (average of C$ 634). Flying from London Heathrow Airport to San Francisco in July is currently the most expensive (average of C$ 857). 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 October 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.

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 28 October 2025.
See what other customers who have flown with United Airlines from London Heathrow Airport to San Francisco have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
9,001 reviews
Check prices

Comfort

7.3

Entertainment

7.1

Overall

7.4

Crew

8.1

Food

6.6

Boarding

7.7

Reviews

1 / 20
10.0
Excellent

Tim,Sep 2025

LHR - IAD

The premium economy seats were very comfortable and the attention and service by the flight attendants was superb.
United Airlines
7.4
Good
9,001 reviews
United Airlines
7.4
Good
9,001 reviews
Check prices

Comfort

7.3

Entertainment

7.1

Overall

7.4

Crew

8.1

Food

6.6

Boarding

7.7

Reviews

1 / 20
10.0
Excellent

Tim,Sep 2025

LHR - IAD

The premium economy seats were very comfortable and the attention and service by the flight attendants was superb.

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 25 inbound flights from London Heathrow per day. 1 airline has 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 30m. Scandinavian Airlines provides one of the quickest options available for as low as C$ 863. Airlines will cover a distance of 8610 km. Both multi-stop and direct flights can be found to your destination and back.

  • What is the cheapest airline to fly from London Heathrow Airport to San Francisco round-trip?

    Cheapflights users have booked flights from London Heathrow Airport to San Francisco round-trip from C$ 890. United Airlines is currently priced 6% below the average price you’ll pay for this route.

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

    To fly one-way, consider booking your trip with Delta, which is currently one of the cheapest options available, starting at C$ 657. SWISS flights start at C$ 663 while deals on British Airways start at C$ 673 one-way.

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

    Consider Air New Zealand (87%), KLM (85%) or Air France (85%) 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$ 1,792, our data indicates the cheapest price to be C$ 621. The most popular route (London Heathrow - San Francisco), is priced around C$ 729.

  • 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, December is the cheapest month in which you can book a flight from London Heathrow Airport to San Francisco (average of C$ 634). Flying from London Heathrow Airport to San Francisco in July is currently the most expensive (average of C$ 857). 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
Alameda
Redwood City
Burlingame
San Bruno
South San Francisco
Scotts Valley
Novato
Santa Clara
Vallejo

Browse thousands of different options on Cheapflights for your next trip

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Top airline flying from Heathrow to San Francisco

Discover the top airline that operate flights from Heathrow to San Francisco. 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 629,999 searches. Data last updated 28 October 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapestC$ 890AverageC$ 890FlexibilityNo cancel feeOn-time69%
Search United Airlines flights

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.

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