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Cheap flights from London Heathrow Airport to San Francisco from £336

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 23/9. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SFO
18 Okt — 25 Okt1
1 adult
1 adult, Economy

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 Thursday 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 September 2025.

Round-trip from

£381

One-way from

£336

Popular in

July

Cheapest in

February

Average price

£426

Good round-trip deal

£436 or less

Good one-way deal

£478 or less
Air Canada
  • Air Canada
  • 7/10-15/10
  • 3 total stops
  • 34h 43m total
  • London to San Francisco
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Aer Lingus
  • Aer Lingus
  • 23/9
  • 1 total stop
  • 26h 45m total
  • London to San Francisco
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Highest demand for flights based on searches. 15% potential increase in price (£64 potential increase over avg. return price).
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Cheapest flight prices on average. 2% potential price decrease (£10 potential savings vs. average return price).
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Average for round-trip flights in September 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

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 September 2025.

Do 13/1106:30LHR - SFO
2 stops18h 55mMultiple Airlines
So 30/1108:38SFO - LHR
1 stop17h 32mMultiple Airlines
Deal found 18/9£381
Di 18/1109:30LHR - SFO
2 stops19h 20mMultiple Airlines
Di 2/1207:30SFO - LHR
2 stops19h 50mMultiple Airlines
Deal found 17/9£382
Do 2/1008:40LHR - SFO
1 stop15h 30mSWISS
Mi 29/1020:25SFO - LHR
1 stop18h 15mSWISS
Deal found 16/9£382
Mi 1/1006:30LHR - SFO
2 stops19h 15mUnited Airlines
Mi 8/1013:25SFO - LHR
1 stop13h 45mUnited Airlines
Deal found 16/9£383
Mi 1/1006:30LHR - SFO
2 stops19h 15mUnited Airlines
Mi 15/1013:02SFO - LHR
1 stop13h 38mUnited Airlines
Deal found 17/9£384
Do 25/908:40LHR - SFO
1 stop15h 30mSWISS
Mi 8/1019:30SFO - LHR
2 stops28h 45mSWISS
Deal found 16/9£385
So 21/906:00LHR - SFO
1 stop18h 35mMultiple Airlines
So 14/1208:25SFO - LHR
1 stop14h 15mMultiple Airlines
Deal found 16/9£385
Mi 24/906:30LHR - SFO
1 stop13h 15mDelta
Mo 3/1116:30SFO - LHR
Nonstop10h 10mDelta
Deal found 16/9£387
So 5/1009:30LHR - SFO
1 stop18h 21mAir Canada
Fr 17/1011:40SFO - LHR
1 stop13h 55mAir Canada
Deal found 17/9£388
Sa 1/1111:45LHR - SFO
Nonstop11h 15mBritish Airways
Sa 8/1120:40SFO - LHR
Nonstop10h 30mBritish Airways
Deal found 16/9£388
Mi 1/1009:30LHR - SFO
1 stop18h 21mAir Canada
So 5/1011:40SFO - LHR
1 stop13h 55mAir Canada
Deal found 16/9£389

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 September 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

Sa 4/10

06:30-17:45

2 stops19h 15m

San Francisco

Sa 11/10

11:40-09:35

1 stop13h 55m

£384

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Mo 1/12

16:40-19:35

1 stop34h 55m

San Francisco

Sa 13/12

16:15-13:30

1 stop13h 15m

£387

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Mo 16/2

10:05-13:20

Nonstop11h 15m

San Francisco

Fr 6/3

12:50-07:25

Nonstop10h 35m

£393

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Di 7/10

16:15-19:20

Nonstop11h 05m

San Francisco

Di 14/10

16:05-10:25

Nonstop10h 20m

£393

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Mi 11/2

13:45-17:00

Nonstop11h 15m

San Francisco

Fr 6/3

12:50-07:25

Nonstop10h 35m

£393

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

So 5/10

12:20-15:25

Nonstop11h 05m

San Francisco

Fr 17/10

13:05-07:25

Nonstop10h 20m

£394

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Mo 1/12

14:30-20:34

1 stop14h 04m

San Francisco

So 14/12

12:50-07:25

Nonstop10h 35m

£396

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Di 10/2

15:10-21:58

1 stop14h 48m

San Francisco

Fr 6/3

07:32-08:10

1 stop16h 38m

£397

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Mo 29/9

16:40-00:55

1 stop16h 15m

San Francisco

Do 6/11

13:25-13:30

1 stop16h 05m

£399

LondonSan Francisco

LHR - SFO

LHRSFO

London Heathrow

Fr 13/2

11:40-14:40

Nonstop11h 00m

San Francisco

Do 26/2

00:40-07:05

1 stop22h 25m

£407

Flights are sorted by cheapest return flights first.

Deals found on 17/9

Showing 1-10 of 23 results
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2
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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 12 September 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 September 2025.

It’s typically best to fly out from London Heathrow Airport to San Francisco in the evening. Doing so could potentially save you 50% 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 14 September 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.

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 September 2025.
See what other customers who have flown with Austrian Airlines, United Airlines, andVirgin Atlantic 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.
Austrian Airlines
7.6
Good
850 reviews
Check prices

Overall

7.6

Comfort

7.3

Crew

8.1

Food

6.8

Boarding

7.6

Entertainment

6.8

Reviews

1 / 20
10.0
Excellent

Andrew,Sept 2025

FLR - VIE

Staff was really nice, they provided water as a beverage. Otherwise you had to purchase beverages or food. A complementary chocolate was provided at the end of the flight.
Austrian Airlines
7.6
Good
850 reviews
Austrian Airlines
7.6
Good
850 reviews
Check prices

Overall

7.6

Comfort

7.3

Crew

8.1

Food

6.8

Boarding

7.6

Entertainment

6.8

Reviews

1 / 20
10.0
Excellent

Andrew,Sept 2025

FLR - VIE

Staff was really nice, they provided water as a beverage. Otherwise you had to purchase beverages or food. A complementary chocolate was provided at the end of the flight.
United Airlines
7.4
Good
8,926 reviews
Austrian Airlines
7.6
Good
850 reviews
Check prices

Overall

7.6

Comfort

7.3

Crew

8.1

Food

6.8

Boarding

7.6

Entertainment

6.8

Reviews

1 / 20
10.0
Excellent

Andrew,Sept 2025

FLR - VIE

Staff was really nice, they provided water as a beverage. Otherwise you had to purchase beverages or food. A complementary chocolate was provided at the end of the flight.
Virgin Atlantic
7.4
Good
664 reviews
Austrian Airlines
7.6
Good
850 reviews
Check prices

Overall

7.6

Comfort

7.3

Crew

8.1

Food

6.8

Boarding

7.6

Entertainment

6.8

Reviews

1 / 20
10.0
Excellent

Andrew,Sept 2025

FLR - VIE

Staff was really nice, they provided water as a beverage. Otherwise you had to purchase beverages or food. A complementary chocolate was provided at the end of the flight.
Lufthansa
6.8
Okay
7,409 reviews
Austrian Airlines
7.6
Good
850 reviews
Check prices

Overall

7.6

Comfort

7.3

Crew

8.1

Food

6.8

Boarding

7.6

Entertainment

6.8

Reviews

1 / 20
10.0
Excellent

Andrew,Sept 2025

FLR - VIE

Staff was really nice, they provided water as a beverage. Otherwise you had to purchase beverages or food. A complementary chocolate was provided at the end of the flight.
British Airways
6.7
Okay
7,367 reviews
Austrian Airlines
7.6
Good
850 reviews
Check prices

Overall

7.6

Comfort

7.3

Crew

8.1

Food

6.8

Boarding

7.6

Entertainment

6.8

Reviews

1 / 20
10.0
Excellent

Andrew,Sept 2025

FLR - VIE

Staff was really nice, they provided water as a beverage. Otherwise you had to purchase beverages or food. A complementary chocolate was provided at the end of the flight.

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 41 daily inbound flights from London Heathrow from 17 different airlines.

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

    United Airlines can get you from London Heathrow Airport to San Francisco in just under 19h 15m. Your travel time can differ by up to . Airlines will cover a distance of 5350 mi.

  • 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 £234. Other airlines that can offer you cheap pricing are TAP AIR PORTUGAL, from £345, and SWISS, from £347. Delta is priced at 52% lower than the current average price of a flight leaving 3 months from now.

  • 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: KLM (86%), Air France (86%), Delta (86%).

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

    The cheapest flight price from London Heathrow Airport to San Francisco is £373. On average you can expect to pay £1,776. The most popular route, (London Heathrow - San Francisco), can usually be booked for £344.

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

    Flights departing from London Heathrow Airport and landing in San Francisco stopover in Copenhagen most frequently. Lisbon is the second most popular location for stopovers on flights 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, Rådhuspladsen, and Opera House. Tivoli, Rådhuspladsen, and Opera House can be visited by traveling about 5.3 mi, 5.2 mi, and 4.9 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 £39.

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

    Most Lisbon visitors opt to spend their time at Chiado, Londres, and Sé de Lisboa. Chiado, Londres, and Sé de Lisboa are located about 4.5 mi, 2.3 mi, and 4.6 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 £12.

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

    London Heathrow Airport to San Francisco flights have a stopover in Dublin least often.

  • 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 San Francisco?

Book flights to San Francisco if you plan to visit one of these locations
Santa Cruz
Newark
South San Francisco
Bodega Bay
Pacific Grove

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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 September 2025.
Virgin Atlantic flights from London Heathrow to San Francisco
British Airways flights from London Heathrow to San Francisco
Lufthansa flights from London Heathrow to San Francisco

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 September 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest£234Average£483FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
TAP AIR PORTUGALCheapest£345Average£490FlexibilityNo cancel feeOn-timeN/A
Search TAP AIR PORTUGAL flights
SWISSCheapest£347Average£399FlexibilityNo cancel feeOn-time79%
Search SWISS flights
Aer LingusCheapest£348Average£551FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
Scandinavian AirlinesCheapest£349Average£540FlexibilityNo cancel feeOn-time77%
Search Scandinavian Airlines flights
Brussels AirlinesCheapest£353Average£470FlexibilityNo cancel feeOn-timeN/A
Search Brussels Airlines flights
Air CanadaCheapest£354Average£483FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
Virgin AtlanticCheapest£358Average£487FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
United AirlinesCheapest£362Average£540FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
British AirwaysCheapest£362Average£467FlexibilityNo cancel feeOn-time70%
Search British Airways flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers 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?

900+ travel sites are searched through when a user searches for a flight using Cheapflights. From the search interface, users can use filters to choose airlines, airports, flight times, cabin classes and more to their preference. Book your flight to San Francisco from Heathrow today with Cheapflights!

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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