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Cheap flights from London Heathrow Airport to San Francisco from £375

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 26/4. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SFO
23 Apr — 30 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 Tuesday or Friday 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 18 April 2025.

Round-trip from

£396

One-way from

£375

Popular in

July

Cheapest in

February

Average price

£478

Good round-trip deal

£471 or less

Good one-way deal

£517 or less
United Airlines
  • United Airlines
  • 23/5-6/6
  • 2 total stops
  • 30h 02m total
  • London to San Francisco
Aer Lingus
  • Aer Lingus
  • 26/4
  • 1 total stop
  • 16h 15m total
  • London to San Francisco
Highest demand for flights based on searches. 19% potential increase in price (£93 potential increase over avg. return price).
Cheapest flight prices on average. 3% potential price decrease (£14 potential savings vs. average return price).
Average for round-trip flights in April 2025
Price to beat on a round-trip flight from London Heathrow to San Francisco.
Price to beat on a one-way flight from London Heathrow to San Francisco.

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 18 April 2025.

Thu 24/413:45LHR - SFO
1 stop34h 25mSWISS
Wed 7/519:30SFO - LHR
1 stop14h 20mSWISS
Deal found 17/4£394
Fri 23/511:25LHR - SFO
2 stops19h 37mUnited Airlines
Fri 6/613:00SFO - LHR
Nonstop10h 25mUnited Airlines
Deal found 16/4£396
Wed 30/407:25LHR - SFO
1 stop15h 10mMultiple Airlines
Fri 25/714:05SFO - LHR
1 stop13h 45mMultiple Airlines
Deal found 17/4£402
Sat 26/407:25LHR - SFO
1 stop15h 10mLufthansa
Fri 2/515:55SFO - LHR
Nonstop10h 30mLufthansa
Deal found 17/4£402
Mon 15/910:20LHR - SFO
2 stops19h 37mFinnair
Fri 26/913:15SFO - LHR
1 stop13h 50mFinnair
Deal found 17/4£417
Thu 1/516:25LHR - SFO
Nonstop11h 05mAir France
Mon 12/521:20SFO - LHR
Nonstop10h 20mAir France
Deal found 17/4£422
Mon 1/916:25LHR - SFO
Nonstop11h 05mVirgin Atlantic
Mon 15/921:00SFO - LHR
1 stop15h 00mVirgin Atlantic
Deal found 17/4£425
Sat 3/516:15LHR - SFO
Nonstop11h 05mBrussels Airlines
Wed 14/519:40SFO - LHR
Nonstop10h 30mBrussels Airlines
Deal found 17/4£426
Wed 7/519:50LHR - SFO
1 stop26h 40mTAP AIR PORTUGAL
Tue 21/1016:20SFO - LHR
1 stop17h 25mTAP AIR PORTUGAL
Deal found 17/4£432
Tue 29/414:05LHR - SFO
1 stop15h 40mAir Canada
Wed 7/508:15SFO - LHR
1 stop14h 15mAir Canada
Deal found 16/4£435
Sat 13/910:45LHR - SFO
Nonstop11h 05mIberia
Sat 27/919:20SFO - LHR
Nonstop10h 25mIberia
Deal found 17/4£436
Sun 14/912:20LHR - SFO
Nonstop11h 05mAustrian Airlines
Fri 26/919:50SFO - LHR
Nonstop10h 20mAustrian Airlines
Deal found 17/4£438

Cheapflights Fare Finder

Customise 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 858,174 searches. Data last updated 18 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

Fri 23/5

11:25-23:02

2 stops19h 37m

San Francisco

Fri 6/6

22:35-11:10

1 stop28h 35m

£396

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Thu 8/5

08:40-16:10

1 stop15h 30m

San Francisco

Mon 12/5

19:30-17:50

1 stop14h 20m

£399

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Wed 30/4

07:25-14:35

1 stop15h 10m

San Francisco

Fri 25/7

14:05-11:50

1 stop13h 45m

£402

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Sun 27/4

07:25-14:35

1 stop15h 10m

San Francisco

Mon 5/5

12:55-07:25

Nonstop10h 30m

£402

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Tue 13/5

08:45-20:10

2 stops19h 25m

San Francisco

Sun 18/5

08:35-10:00

2 stops17h 25m

£414

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Fri 2/5

06:20-15:55

1 stop17h 35m

San Francisco

Sun 11/5

19:30-13:55

Nonstop10h 25m

£415

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Mon 15/9

10:20-21:57

2 stops19h 37m

San Francisco

Fri 26/9

23:46-06:55

2 stops23h 09m

£417

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Sat 6/9

16:25-19:30

Nonstop11h 05m

San Francisco

Thu 18/9

21:20-15:40

Nonstop10h 20m

£421

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Mon 1/9

16:25-19:30

Nonstop11h 05m

San Francisco

Mon 15/9

21:00-20:00

1 stop15h 00m

£425

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Sat 3/5

16:15-19:20

Nonstop11h 05m

San Francisco

Wed 14/5

19:40-14:10

Nonstop10h 30m

£426

Flights are sorted by cheapest return flights first.

Deals found on 16/4

Showing 1-10 of 27 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 return 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 return flight from Heathrow to San Francisco. Price data was last updated on 11 April 2025.

The price you pay for your flight from London Heathrow Airport to San Francisco may vary depending on when you book. For the best chance of a lower fare, look to book 82 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

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 £538). Flying from London Heathrow Airport to San Francisco in July is currently the most expensive (average of £803). 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 18 April 2025.

It’s typically best to fly out from London Heathrow Airport to San Francisco in the evening. Doing so could potentially save you 47% on the flight price compared to flying at midday, which is usually more expensive.

What is the cheapest day to fly from London Heathrow Airport to San Francisco?

Use this chart to determine the cheapest time to fly return from Heathrow to San Francisco. Price data was last updated on 30 March 2025.

Travellers seeking maximum savings on their London Heathrow Airport to San Francisco flight should consider departing on Wednesday evenings when fares are most often at their lowest. Sunday at midday flights should be avoided if possible as fares are typically the most expensive at this time.

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 18 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 inches 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 18 April 2025.
Peruse reviews from past customers who have flown with Delta, Air New Zealand and KLM from London to San Francisco to help guide your decision. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Overall

8.0

Crew

8.5

Food

7.3

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
8.0
Very Good

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Overall

8.0

Crew

8.5

Food

7.3

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

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Overall

8.0

Crew

8.5

Food

7.3

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

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Overall

8.0

Crew

8.5

Food

7.3

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

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Overall

8.0

Crew

8.5

Food

7.3

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

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Overall

8.0

Crew

8.5

Food

7.3

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?

    Located just 11.8 mi from the city center, San Francisco is the airport most travelers will use when flying to San Francisco from London Heathrow. Booking flights from London Heathrow to San Francisco (SFO) should be relatively easy as there are 36 daily inbound flights from London Heathrow from 16 different airlines.

  • 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 £396. Other airlines that can offer you cheap pricing are Delta, from £398, and SWISS, from £399. United Airlines is priced at 23% lower than the current average price of a flight leaving 3 months from now.

  • 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 Aer Lingus, which is currently one of the cheapest options available, starting at £375. WestJet flights start at £381 while deals on Finnair start at £426 one-way.

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

    Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from London Heathrow Airport to San Francisco on time: Air Canada (92%), Austrian Airlines (92%), United Airlines (92%).

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

    The cheapest flight price from London Heathrow Airport to San Francisco is £403. On average you can expect to pay £1,524. The most popular route, (London Heathrow - San Francisco), can usually be booked for £331.

  • Where are the most common stopover locations when flying from London Heathrow Airport to San Francisco?

  • What are some popular things to do or see while on a stopover in Copenhagen?

    The majority of Copenhagen visitors spend their time at Tivoli, Opera House, and Højbro Plads. Tivoli, Opera House, and Højbro Plads can be visited by traveling about 5.3 mi, 4.9 mi, and 5.1 mi respectively from Kastrup Copenhagen. Those on a stopover in Copenhagen in need of a car hire can book one at Kastrup Copenhagen for about £28.

  • What are some popular points of interest to see during a stopover in Lisbon?

    Most Lisbon visitors opt to spend their time at Chiado, Sé de Lisboa, and Elevador de Santa Justa. Chiado, Sé de Lisboa, and Elevador de Santa Justa are located about 4.5 mi, 4.6 mi, and 4.4 mi, respectively from Lisbon Humberto Delgado. Those on a stopover in Lisbon in need of a car hire can book one at Lisbon Humberto Delgado for about £16.

  • Where are the least popular stopover locations for London Heathrow Airport to San Francisco flights?

  • 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 holiday 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 £538). Flying from London Heathrow Airport to San Francisco in July is currently the most expensive (average of £803). 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
Santa Cruz
Los Banos
Vallejo
Newark
South San Francisco
Pacific Grove
Union City

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Fly from Heathrow to San Francisco on these airlines

Choose from the following airlines for your flight from Heathrow to San Francisco. Flights are based on user searches made on Cheapflights and were last updated on 18 April 2025.

Top 10 airlines flying from Heathrow to San Francisco

Discover the top 10 airlines 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 858,174 searches. Data last updated 18 April 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest£241Average£475FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Air CanadaCheapest£283Average£472FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
TAP AIR PORTUGALCheapest£352Average£478FlexibilityNo cancel feeOn-timeN/A
Search TAP AIR PORTUGAL flights
Scandinavian AirlinesCheapest£358Average£570FlexibilityNo cancel feeOn-time77%
Search Scandinavian Airlines flights
Virgin AtlanticCheapest£365Average£503FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
British AirwaysCheapest£372Average£489FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Brussels AirlinesCheapest£374Average£502FlexibilityNo cancel feeOn-timeN/A
Search Brussels Airlines flights
Austrian AirlinesCheapest£377Average£484FlexibilityNo cancel feeOn-time78%
Search Austrian Airlines flights
KLMCheapest£379Average£478FlexibilityNo cancel feeOn-time75%
Search KLM flights
FinnairCheapest£381Average£492FlexibilityNo cancel feeOn-time76%
Search Finnair flights

Fly with Cheapflights

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

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

By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to San Francisco from Heathrow.

Can Cheapflights find flights from Heathrow to San Francisco with no change fees?

Yes! Cheapflights helps users easily find flights from Heathrow to San Francisco with no change fees.

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

Of course! You can now track prices for flights from Heathrow to San Francisco and get an alert from Cheapflights when they change. Have a valid email address ready and click the bell icon next to the flight deals above to set up your price alerts.

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