S$399 Cheap Flights from San Francisco to London

View S$399 flight on Sun, 25 Jan, 2026Opens in a new window

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

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

Prices were available within the past 7 days and start at S$399 for one-way flights and S$795 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Wed, 26 Nov - Wed, 3 Dec
SFO
San Francisco
LHR
London
S$795 Return, found 3 days ago
S$795
Return
found 3 days ago
Select United flight, departing Wed, 26 Nov from San Francisco to London, returning Wed, 3 Dec, priced at S$795 found 3 days ago
United
Wed, 14 Jan - Tue, 27 Jan
SFO
San Francisco
LHR
London
S$803 Return, found 5 days ago
S$803
Return
found 5 days ago
Select United flight, departing Wed, 14 Jan from San Francisco to London, returning Tue, 27 Jan, priced at S$803 found 5 days ago
Air Canada
Wed, 14 Jan - Tue, 27 Jan
SFO
San Francisco
LHR
London
S$810 Return, found 5 days ago
S$810
Return
found 5 days ago
Select Air Canada flight, departing Wed, 14 Jan from San Francisco to London, returning Tue, 27 Jan, priced at S$810 found 5 days ago
Air Canada
Wed, 14 Jan - Tue, 27 Jan
SFO
San Francisco
LHR
London
S$812 Return, found 5 days ago
S$812
Return
found 5 days ago
Select Air Canada flight, departing Wed, 14 Jan from San Francisco to London, returning Tue, 27 Jan, priced at S$812 found 5 days ago
Virgin Atlantic
Wed, 14 Jan - Tue, 27 Jan
SFO
San Francisco
LHR
London
S$819 Return, found 5 days ago
S$819
Return
found 5 days ago
Select Virgin Atlantic flight, departing Wed, 14 Jan from San Francisco to London, returning Tue, 27 Jan, priced at S$819 found 5 days ago
Delta
Wed, 26 Nov - Wed, 3 Dec
SFO
San Francisco
LHR
London
S$819 Return, found 3 days ago
S$819
Return
found 3 days ago
Select Delta flight, departing Wed, 26 Nov from San Francisco to London, returning Wed, 3 Dec, priced at S$819 found 3 days ago
Air Canada
Wed, 26 Nov - Wed, 3 Dec
SFO
San Francisco
LHR
London
S$827 Return, found 3 days ago
S$827
Return
found 3 days ago
Select Air Canada flight, departing Wed, 26 Nov from San Francisco to London, returning Wed, 3 Dec, priced at S$827 found 3 days ago
Swiss International Air Lines
Wed, 14 Jan - Tue, 27 Jan
SFO
San Francisco
LHR
London
S$852 Return, found 5 days ago
S$852
Return
found 5 days ago
Select Swiss International Air Lines flight, departing Wed, 14 Jan from San Francisco to London, returning Tue, 27 Jan, priced at S$852 found 5 days ago
British Airways
Wed, 26 Nov - Wed, 3 Dec
SFO
San Francisco
LHR
London
S$855 Return, found 3 days ago
S$855
Return
found 3 days ago
Select British Airways flight, departing Wed, 26 Nov from San Francisco to London, returning Wed, 3 Dec, priced at S$855 found 3 days ago
Lufthansa
Wed, 14 Jan - Tue, 27 Jan
SFO
San Francisco
LHR
London
S$865 Return, found 5 days ago
S$865
Return
found 5 days ago
Select Lufthansa flight, departing Wed, 14 Jan from San Francisco to London, returning Tue, 27 Jan, priced at S$865 found 5 days ago

Find the cheapest month to fly from San Francisco (SFO) to London (LHR)

January is typically the cheapest month to fly

From S$574 - S$1,232 per traveller.

Graph displaying average flight prices per month

San Francisco to London route information
Origin airport
San Francisco Intl.
Destination airport
Heathrow
Airlines serving
Aer Lingus, Air France, American Airlines, Austrian Airlines, British Airways, Delta, Finnair, Iberia, KLM, Lufthansa, Singapore Airlines, Swiss International Air Lines, United, Virgin Atlantic
Return price
S$794
Distance
8567 km
Average flight time
18 hours 22 mins

Perfect flights from San Francisco to London

Your Journey from San Francisco to London

Start your unforgettable journey with Expedia. Our broad selection of flights from San Francisco to London caters to every travel need. Whether you're yearning for a romantic escape, a solo adventure, or a cultural immersion, we've got you covered.
 

Choosing Your Ideal Flight

With Expedia, you have access to a wide range of airlines, including WestJet, Virgin Atlantic, Delta, United, Air Canada, British Airways, Air France, Swiss International Air Lines, Lufthansa. Our selection of flights from San Francisco Intl. to Heathrow caters to every traveler's requirements, ensuring your journey aligns with your schedule. With options from 20 airlines, you're bound to find the perfect flight.
 

Maximizing Value with San Francisco to London Flights

Experience the joy of finding cheap flights from San Francisco Intl. to Heathrow that fit your budget. Keep an eye out for our special deals and discounts, and check our flexible one-way fares from S$399 and roundtrip prices from S$795*.
 

Pre-Flight Essentials

Ensure a smooth journey from San Francisco to London with Expedia. From information about check-in times and in-flight amenities to guidance on baggage policies, we provide all the essentials to prepare you for your flight.
 

Experience the Vibrant London

Picture yourself stepping off the plane in London and immersing yourself in the unique atmosphere of . From local markets to cultural festivals, each city offers its distinct charm. Make the most of your trip by exploring local attractions and indulging in the local cuisine. With Expedia, explore all this and more, tailored to your budget.
 

Added Convenience on Your San Francisco to London Flight

Traveling with Expedia is more than just a flight. We offer details about in-flight amenities, baggage policies, and more to ensure a smooth and hassle-free journey. Choose from our variety of airlines and embark on a memorable journey from San Francisco to London.
 

Beyond the Flight – Exploring London

With Expedia, your adventure extends beyond the flight. Explore London at your own pace by renting a car or booking a hotel. Discover hidden gems off the beaten path and create unforgettable memories.
 

Book Your Flight from San Francisco to London with Confidence

Planning your next great adventure is a breeze with Expedia. Our user-friendly platform, unbeatable prices, and round-the-clock customer support make your travel experience seamless and stress-free. Embark on your journey from San Francisco to London with confidence. Book your travel arrangements with Expedia today.
 
*Note: Prices may vary based on availability and are subject to change.

Frequently asked questions

How much is a flight from San Francisco Intl. Airport (SFO) to Heathrow Airport?
Round-trip tickets from San Francisco Intl. Airport (SFO) to London Heathrow start from S$795. This is based on fares offered within the last 7 days on Expedia for flights departing within the next year — make your booking ASAP to avoid missing out. Prices and availability are subject to change. Additional terms apply.
Do I need to pay a cancellation fee if I cancel my flight from San Francisco Intl. Airport (SFO) to LHR?
Most flights can be cancelled online, but each air carrier has different terms and conditions. If you do have to cancel your flight, go to our Customer Service Portal and follow the instructions.
How do I find cheap flights from SFO to London Heathrow that have flexible change policies?
Many airlines offer the option to reschedule your flight without a change fee. All you pay is the difference between the original flight and the new flight. When you're searching for San Francisco Intl. Airport (SFO) to Heathrow Airport (LHR) flights, you'll see a "no change fees" filter for you to select.
How far is the flight from SFO to LHR?
San Francisco to Hounslow is around 8,600 kilometres, so get ready to spend a while in the air. Don't forget to pack all the essentials, from your headphones to your hoodie. Take some snacks to munch on throughout your flight too.
Which airlines fly direct from SFO to London Heathrow?
A popular airline that flies from SFO to LHR is United Airlines (UA). It offers 60 flights a month. After some more options? Check out the airfares with British Airways (BA). This carrier offers 60 monthly flights between these airports.
Are San Francisco Airport to Heathrow Airport flight tickets cheaper when they're purchased at the last minute?
Last-minute bookings from San Francisco Intl. Airport (SFO) to London Heathrow can be hit-or-miss. You may be able to score a great bargain, but you could also miss out completely! If you'd prefer to play it safe and start planning your trip early on, Expedia compares flight deals up to a year in advance. Just remember that not all airlines advertise their prices so far in advance. Our advice? Check back often as updates are made frequently.

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