$229 Cheap Flights from San Francisco (SFO) to London (LHR)

View $229 flight on Thu, Jul 31, 2025Opens in a new window

Popular airlines from San Francisco Intl. Airport (SFO) to Heathrow Airport (LHR)

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Find available prices by choosing your travel dates.

Cheap Flights from San Francisco to London (SFO-LHR)

Prices were available within the past 7 days and start at $229 for one-way flights and $551 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

TAP Portugal
Mon, Mar 2 - Thu, Mar 19
SFO
San Francisco
LHR
London
$551 Roundtrip, just found
$551
Roundtrip
just found
Select TAP Portugal flight, departing Mon, Mar 2 from San Francisco to London, returning Thu, Mar 19, priced at $551 just found
United
Sat, Jan 3 - Sat, Jan 17
SFO
San Francisco
LHR
London
$574 Roundtrip, found 6 hours ago
$574
Roundtrip
found 6 hours ago
Select United flight, departing Sat, Jan 3 from San Francisco to London, returning Sat, Jan 17, priced at $574 found 6 hours ago
Scandinavian Airlines
Fri, Mar 6 - Sat, Mar 14
SFO
San Francisco
LHR
London
$589 Roundtrip, found 3 hours ago
$589
Roundtrip
found 3 hours ago
Select Scandinavian Airlines flight, departing Fri, Mar 6 from San Francisco to London, returning Sat, Mar 14, priced at $589 found 3 hours ago
Lufthansa
Sat, Jan 3 - Sat, Jan 17
SFO
San Francisco
LHR
London
$622 Roundtrip, found 6 hours ago
$622
Roundtrip
found 6 hours ago
Select Lufthansa flight, departing Sat, Jan 3 from San Francisco to London, returning Sat, Jan 17, priced at $622 found 6 hours ago
Aer Lingus
Tue, Nov 18 - Wed, Nov 26
SFO
San Francisco
LHR
London
$635 Roundtrip, found 2 days ago
$635
Roundtrip
found 2 days ago
Select Aer Lingus flight, departing Tue, Nov 18 from San Francisco to London, returning Wed, Nov 26, priced at $635 found 2 days ago
Iberia
Mon, Aug 18 - Tue, Aug 26
SFO
San Francisco
LHR
London
$659 Roundtrip, found 2 hours ago
$659
Roundtrip
found 2 hours ago
Select Iberia flight, departing Mon, Aug 18 from San Francisco to London, returning Tue, Aug 26, priced at $659 found 2 hours ago
Virgin Atlantic
Mon, Aug 25 - Mon, Sep 15
SFO
San Francisco
LHR
London
$661 Roundtrip, just found
$661
Roundtrip
just found
Select Virgin Atlantic flight, departing Mon, Aug 25 from San Francisco to London, returning Mon, Sep 15, priced at $661 just found
Delta
Wed, Apr 30 - Wed, May 7
SFO
San Francisco
LHR
London
$661 Roundtrip, just found
$661
Roundtrip
just found
Select Delta flight, departing Wed, Apr 30 from San Francisco to London, returning Wed, May 7, priced at $661 just found
British Airways
Mon, Aug 25 - Mon, Sep 15
SFO
San Francisco
LHR
London
$669 Roundtrip, just found
$669
Roundtrip
just found
Select British Airways flight, departing Mon, Aug 25 from San Francisco to London, returning Mon, Sep 15, priced at $669 just found
Virgin Atlantic
Wed, Apr 30 - Wed, May 7
SFO
San Francisco
LHR
London
$675 Roundtrip, just found
$675
Roundtrip
just found
Select Virgin Atlantic flight, departing Wed, Apr 30 from San Francisco to London, returning Wed, May 7, priced at $675 just found
Flights from San Francisco (SFO) to London (LHR)
Origin airport
San Francisco Intl.
Destination airport
Heathrow
Airlines serving
Aer Lingus, Air Canada, Air France, Alaska Airlines, American Airlines, Austrian Airlines, British Airways, Brussels Airlines, Delta, Finnair, Iberia, JetBlue Airways, KLM, Lufthansa, Scandinavian Airlines, Swiss International Air Lines, Turkish Airlines, United, Virgin Atlantic, WestJet
Roundtrip price
$551
Distance
5354 mi

San Francisco to London Flights

The cheapest times to fly from San Francisco to London

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from San Francisco to London are during the month of March. You can find some of the cheapest flights from San Francisco to London with Expedia's search tool and vast selection of airlines.

The best time to book a flight from San Francisco to London

Sunday is one of the best days to book for cheap flights from San Francisco to London: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

How to find cheap round-trip tickets from San Francisco to London

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from San Francisco to London in 2025. You can also book with separate airlines for your outbound and return journeys, from $229 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap San Francisco to London flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

You could also save big by booking one of Expedia's vacation packages. Bundling together your San Francisco to London airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

*Terms apply.

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

Frequently asked questions

How much does a flight from San Francisco Intl. Airport (SFO) to Heathrow Airport (LHR) cost?
Book cheap return flights starting at $673 from San Francisco Intl. Airport (SFO) to Heathrow Airport (LHR). This information is based on the cheapest price found on Expedia for this return journey departing within the next three months. This airfare is for a Iberia flight leaving SFO on May 13 2025 and touching down at LHR. The price was last updated on April 22 2025 and has not changed since.
What is the cheapest month to fly from SFO to LHR?
The cheapest flights from SFO to LHR are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
Which airlines fly direct from San Francisco Intl. Airport (SFO) to Heathrow Airport (LHR)?
Pick from 3 airlines that fly direct from San Francisco Intl. Airport (SFO) to Heathrow Airport (LHR). These include:

  • United Airlines
  • British Airways
  • Virgin Atlantic

What is the cheapest airline that flies from SFO to LHR?
With prices as low as $404 for a one-way journey from SFO to LHR, American Airlines is currently the cheapest carrier on this route. This fare is based on the lowest price found on Expedia departing within the next three months. The flight takes off from SFO on May 13 2025. Prices were last updated on April 22 2025 and have not changed since.
How many flights per day from San Francisco Intl. Airport (SFO) to Heathrow Airport (LHR)?
When departing from San Francisco Intl. Airport (SFO), you can choose from an average of 4 daily nonstop flights to Heathrow Airport (LHR).
What are the most popular departure times for flights from San Francisco Intl. Airport (SFO) to Heathrow Airport (LHR)?
More passengers fly between SFO and LHR at 5 PM than at any other point in the day. Rather skip the crowds? Pick a flight outside the busiest times and you could save on your ticket as well.
What day of the week has the most flights from SFO to LHR?
Thursday has the most flights from San Francisco Intl. Airport (SFO) to Heathrow Airport (LHR). Consider jetting off on this day and you’ll have a greater chance of finding a departure that fits your schedule.
What is the earliest flight from San Francisco Intl. Airport (SFO) to Heathrow Airport (LHR)?
The first flight of the day out of San Francisco Intl. Airport (SFO) is at around 12:50PM UTC-8. Hop on this flight and you’ll reach Heathrow Airport (LHR) at approximately 7:25AM UTC+0. The total flight duration is 10h 35m.
How long does it take to fly from San Francisco Intl. Airport (SFO) to Heathrow Airport (LHR)?
Flights from SFO to LHR have an average travel time of 10 hours and 29 minutes. The total distance between the two is 5,400 mi.
What airline has the least delays from SFO to LHR?
Consider traveling with Brussels Airlines if you’d like to fly straight from San Francisco Intl. Airport (SFO) to Heathrow Airport (LHR) without any delays. This carrier has the best track record for punctuality, with an on-time score of 88%. Want real-time updates? You can check your flight status using the Expedia App.
What is the best time to fly from San Francisco Intl. Airport (SFO) to Heathrow Airport (LHR)?
Book a flight from San Francisco Intl. Airport (SFO) to Heathrow Airport (LHR) that takes off before 3 PM to reduce the risk of delays and cancellations. Departures later than this are on average 22% more likely to be canceled.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG’s global flight data platform.
What airports do you fly into for London from San Francisco Intl. Airport (SFO)?
Heathrow Airport (LHR) is the only airport in London with direct flights from San Francisco Intl. Airport (SFO). Check out your options and discover affordable fares on Expedia.
Is it cheaper to buy a plane ticket from San Francisco Intl. Airport (SFO) to Heathrow Airport (LHR) last-minute?
Waiting until just before your departure to book your flight from SFO to LHR often results in higher prices. Although you may find some last-minute offers, there’s no guarantee. Keep your travel schedule open to boost your chances of getting a bargain.
Is it cheaper to book a SFO to LHR flight and hotel package?
Compared with arranging hotels and flights separately, booking a SFO to LHR flight and hotel package with Expedia could lead to significant savings. Better still, managing everything in one place takes the hassle out of planning your trip. Simply secure your flights and select from our wide range of stays, then tailor your trip with extras like activities, tours and car rentals.
Can I cancel or change the date of my flight from San Francisco Intl. Airport (SFO) to Heathrow Airport (LHR)?
In most instances, you can cancel or reschedule your SFO to LHR flight. However, there may be additional fees, especially if your booking was made over 24 hours ago. Double-check your itinerary for the airline’s fees and policies on flight changes, or if you need further information, go to our Customer Service portal.

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*Available to One Key members.