Find flights
Deals
When to book
Airlines
FAQs

Cheap flights from London Heathrow Airport to San Francisco from C$ 637

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 31/10. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SFO
20 Apr — 27 Apr1
1 adult

Cheapflights Tip: The best prices from London Heathrow to San Francisco are usually found in February or November, booked 82 days in advance, depart on a Monday or Tuesday 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 15 April 2025.

Round-trip from

C$ 642

Popular in

July

Cheapest in

February

Average price

C$ 880

Good round-trip deal

C$ 1,150 or less

Good one-way deal

C$ 2,989 or less
United Airlines
  • United Airlines
  • 3/7-12/7
  • 2 total stops
  • 30h 02m total
  • London to San Francisco
Search Deals
Highest demand for flights based on searches. 19% potential increase in price (C$ 317 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (C$ 46 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 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

Find flight deals from Heathrow to San Francisco

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 15 April 2025.

Fri 31/1011:10 a.m.LHR - SFO
2 stops27h 20mUnited Airlines
Sun 2/119:30 p.m.SFO - LHR
1 stop25h 10mUnited Airlines
Deal found 15/4C$ 637
Wed 7/58:40 a.m.LHR - SFO
1 stop15h 30mMultiple Airlines
Wed 21/53:55 p.m.SFO - LHR
Nonstop10h 30mMultiple Airlines
Deal found 15/4C$ 733
Thu 4/97:25 a.m.LHR - SFO
1 stop15h 05mLufthansa
Fri 19/91:05 p.m.SFO - LHR
Nonstop10h 20mLufthansa
Deal found 15/4C$ 738
Fri 2/56:00 a.m.LHR - SFO
1 stop18h 10mSWISS
Sun 11/57:30 p.m.SFO - LHR
1 stop15h 50mSWISS
Deal found 15/4C$ 758
Wed 7/52:15 p.m.LHR - SFO
Nonstop11h 00mBritish Airways
Wed 14/57:30 p.m.SFO - LHR
Nonstop10h 25mBritish Airways
Deal found 15/4C$ 786
Mon 8/96:00 a.m.LHR - SFO
1 stop16h 30mTAP AIR PORTUGAL
Tue 16/96:45 p.m.SFO - LHR
2 stops19h 15mTAP AIR PORTUGAL
Deal found 15/4C$ 791
Wed 14/56:30 a.m.LHR - SFO
1 stop13h 15mDelta
Thu 22/59:20 p.m.SFO - LHR
Nonstop10h 20mDelta
Deal found 15/4C$ 808
Fri 5/96:30 a.m.LHR - SFO
1 stop13h 15mKLM
Tue 16/93:00 p.m.SFO - LHR
1 stop14h 10mKLM
Deal found 15/4C$ 809
Fri 16/510:35 a.m.LHR - SFO
Nonstop11h 05mAustrian Airlines
Mon 26/57:50 p.m.SFO - LHR
Nonstop10h 20mAustrian Airlines
Deal found 15/4C$ 865
Wed 30/46:50 a.m.LHR - SFO
2 stops20h 10mBrussels Airlines
Wed 23/79:05 p.m.SFO - LHR
2 stops16h 30mBrussels Airlines
Deal found 15/4C$ 939
Fri 30/59:05 p.m.LHR - SFO
2 stops27h 25mScandinavian Airlines
Fri 6/66:10 a.m.SFO - LHR
2 stops25h 50mScandinavian Airlines
Deal found 15/4C$ 950
Wed 30/49:00 a.m.LHR - SFO
2 stops21h 38mAir France
Sat 14/610:55 a.m.SFO - LHR
2 stops16h 15mAir France
Deal found 15/4C$ 976

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 15 April 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 3/7

11:25 a.m.-11:02 p.m.

2 stops19h 37m

San Francisco

Sat 12/7

1:00 p.m.-7:25 a.m.

Nonstop10h 25m

C$ 642

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Wed 7/5

8:40 a.m.-4:10 p.m.

1 stop15h 30m

San Francisco

Wed 21/5

3:55 p.m.-10:25 a.m.

Nonstop10h 30m

C$ 733

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Thu 4/9

7:25 a.m.-2:30 p.m.

1 stop15h 05m

San Francisco

Fri 19/9

1:05 p.m.-7:25 a.m.

Nonstop10h 20m

C$ 738

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Fri 2/5

6:00 a.m.-4:10 p.m.

1 stop18h 10m

San Francisco

Sun 11/5

7:30 p.m.-7:20 p.m.

1 stop15h 50m

C$ 758

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Wed 7/5

2:15 p.m.-5:15 p.m.

Nonstop11h 00m

San Francisco

Wed 14/5

7:30 p.m.-1:55 p.m.

Nonstop10h 25m

C$ 786

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Mon 8/9

6:00 a.m.-2:30 p.m.

1 stop16h 30m

San Francisco

Tue 16/9

6:45 p.m.-10:00 p.m.

2 stops19h 15m

C$ 791

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Mon 8/9

12:20 p.m.-3:25 p.m.

Nonstop11h 05m

San Francisco

Tue 16/9

7:55 p.m.-2:10 p.m.

Nonstop10h 15m

C$ 800

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Wed 14/5

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

1 stop13h 15m

San Francisco

Thu 22/5

9:20 p.m.-3:40 p.m.

Nonstop10h 20m

C$ 808

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Fri 5/9

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

1 stop13h 15m

San Francisco

Tue 16/9

3:00 p.m.-1:10 p.m.

1 stop14h 10m

C$ 809

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Wed 30/4

6:50 a.m.-7:00 p.m.

2 stops20h 10m

San Francisco

Wed 23/7

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

2 stops16h 30m

C$ 939

Flights are sorted by cheapest round-trip flights first.

Deals found on 15/4

Showing 1-10 of 22 results
1
2
3

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 11 April 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, January is the cheapest month in which you can book a flight from London Heathrow Airport to San Francisco (average of C$ 276). Flying from London Heathrow Airport to San Francisco in June is currently the most expensive (average of C$ 379). 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 15 April 2025.

Unlike in the afternoon, when flights are generally more expensive, you can save up to 44% on flights from London Heathrow Airport to San Francisco by exploring options for tickets at noon.

Weekly flight availability from London Heathrow Airport to San Francisco

Explore weekly flight availability from Heathrow to San Francisco. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated 15 April 2025.

The most flights from LHR to SFO are scheduled on a Monday (37 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (31 on average).

Rainfall in San Francisco by month

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

In terms of precipitation, rainfall in San Francisco ranges from 0.0 - 112.0 mm per month. January is typically the wettest month, when rainfall can reach 112.0 mm. July is typically the driest time to visit San Francisco when rainfall is around 0.0 mm.

Temperature in San Francisco by month

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

If weather is an important factor for your trip to San Francisco, use this chart to help with planning. For those seeking warmer temperatures, September is the ideal time of year to visit, when temperatures reach an average of 17.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 11.0 C).

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 15 April 2025.
Get a feel of what it's like to fly with Delta, KLM and Finnair from London to San Francisco by reading reviews from past customers. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,918 reviews
Check prices

Comfort

7.9

Crew

8.5

Entertainment

7.9

Food

7.3

Boarding

8.2

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Delta
8.0
Very good
7,918 reviews
Delta
8.0
Very good
7,918 reviews
Check prices

Comfort

7.9

Crew

8.5

Entertainment

7.9

Food

7.3

Boarding

8.2

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
KLM
7.8
Good
1,323 reviews
Delta
8.0
Very good
7,918 reviews
Check prices

Comfort

7.9

Crew

8.5

Entertainment

7.9

Food

7.3

Boarding

8.2

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Finnair
7.6
Good
1,269 reviews
Delta
8.0
Very good
7,918 reviews
Check prices

Comfort

7.9

Crew

8.5

Entertainment

7.9

Food

7.3

Boarding

8.2

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Austrian Airlines
7.6
Good
775 reviews
Delta
8.0
Very good
7,918 reviews
Check prices

Comfort

7.9

Crew

8.5

Entertainment

7.9

Food

7.3

Boarding

8.2

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Air France
7.5
Good
1,435 reviews
Delta
8.0
Very good
7,918 reviews
Check prices

Comfort

7.9

Crew

8.5

Entertainment

7.9

Food

7.3

Boarding

8.2

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

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 36 inbound flights from London Heathrow per day. 1 airline has flights to San Francisco from London Heathrow on a regular basis.

  • What are the cheapest airlines flying 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$ 642. Other airlines that can offer you cheap pricing are Lufthansa, from C$ 738, and SWISS, from C$ 758. United Airlines is currently priced 32% 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 WestJet, which is currently one of the cheapest options available, starting at C$ 786. Lufthansa flights start at C$ 1,047 while deals on Icelandair start at C$ 1,492 one-way.

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

    Consider Air Canada (93%), Austrian Airlines (93%) or United Airlines (93%) 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$ 2,408, our data indicates the cheapest price to be C$ 776. The most popular route (London Heathrow - San Francisco), is priced around C$ 1,320.

  • 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, January is the cheapest month in which you can book a flight from London Heathrow Airport to San Francisco (average of C$ 276). Flying from London Heathrow Airport to San Francisco in June is currently the most expensive (average of C$ 379). 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 London Heathrow Airport?

Book flights to London Heathrow Airport if you plan to visit one of these locations
Richmond
San Ramon
Newark
Alameda
Redwood City
Burlingame
South San Francisco
San Bruno
Scotts Valley
Novato
Belmont
Millbrae
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.

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 15 April 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapestC$ 885AverageC$ 885FlexibilityNo 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.

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.