Cheap Flights from London to San Francisco

Q: How does KAYAK find such low prices on flights from London to San Francisco?

KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from London to San Francisco. Visit our flight page for the latest deals!

Q: How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from London to San Francisco?

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to San Francisco from London is likely to change within 7 days, so travelers know whether to wait or book now. Visit our flight page for the latest deals!

Q: What is the Hacker Fare option on flights from London to San Francisco?

Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to San Francisco with an airline and back to London with another airline. Visit our flight page for the latest deals!

Q: What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from London to San Francisco?

Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to San Francisco from London up to 3 days before/after your preferred dates. You can then pick the flights that suit you best. Visit our flight page for the latest deals!

Low season	September	Best time to beat the crowds with an average 16% drop in price.
High season	December	Most popular time to fly with an average 27% increase in price.
Average price round-trip	$409	(avg. price over the last 2 weeks)
Good deal round-trip	$372	or less
Good deal one-way	$410	or less

When to book flights from London to San Francisco

Estimated round-trip price

Average price per month

Top tips for finding a cheap flight

Looking for a cheap flight? 25% of our users found flights on this route for $410 or less one-way and $372 or less round-trip.
High season is considered to be November, December and January. The cheapest month to fly is September.

FAQs for booking flights from London to San Francisco

How does KAYAK find such low prices on flights from London to San Francisco?

How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from London to San Francisco?

What is the Hacker Fare option on flights from London to San Francisco?

What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from London to San Francisco?

COVID-19 information

Safety measures for airlines flying from London to San Francisco

Airlines flying from London to San Francisco have enacted additional safety measures and adjusted policies to better accommodate travelers. Policies vary by airline.

Heightened sanitation

Daily cleaning, installation of cabin HEPA filters on flights from London to San Francisco

Mandatory masks

Masks required on board, masks provided on flights from London to San Francisco

Social distancing seating

Middle seats unavailable to book on flights from London to San Francisco

Pre-flight testing

Testing for antibodies, testing for symptoms for flights from London to San Francisco

Flexible cancellations

Waiving of change fees. Search flexible flights from London to San Francisco

Book cheap flights from London to San Francisco

Round-trip flight deals

multi-stop

Multiple Airlines

2181 mi

YXU - SFO

multi-stop

Multiple Airlines

2181 mi

SFO - YXU

Check prices

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1 stop 2+ stops

One-way flight deals

multi-stop

Multiple Airlines

2181 mi

YXU - SFO

Check prices

Show more results

Search by stops

1 stop 2+ stops

London - San Francisco Flights

Departure:

London (YXU) Canada

Destination:

San Francisco (SFO) United States

Return flight deals:

San Francisco - London

Cabin classes:

First

Business

Prem Econ

Economy

Browse origins:

$570

London

Browse destinations:

$570

San Francisco

Location

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Location

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Choose up to 3 airports

Enter a location to see nearby airports

YXU - SFO

Find cheap flights from London to San Francisco

Search hundreds of travel sites at once for deals on flights to San Francisco

Good to know

Low season

High season

Average price round-trip

Good deal round-trip

Good deal one-way

When to book flights from London to San Francisco

Top tips for finding a cheap flight

FAQs for booking flights from London to San Francisco

How does KAYAK find such low prices on flights from London to San Francisco?

How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from London to San Francisco?

What is the Hacker Fare option on flights from London to San Francisco?

What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from London to San Francisco?

Safety measures for airlines flying from London to San Francisco

Book cheap flights from London to San Francisco

Round-trip flight deals

Search by stops

One-way flight deals

Search by stops

London - San Francisco Flights