RyanairDepart15:35
Fri 11 DecLTN → SFO
17h 00m · 2 stops
£303one way, per person
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- Cheapest fare
- £303
- Cheapest month
- December
- Direct flights
- Not recently
- Quickest trip
- 15h 35m
Ryanair · Fri 11 Dec
from £303
Usually 1+ stop
8,620 km
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Cheapest month to fly from London to San Francisco
Lowest one-way fare per person in each month. Choose a month to see every date.
Cheapest dates in December 2026
The lowest fares we've seen for each day, cheapest first.
Ryanair
Wizz Air UKDepart06:00
Thu 10 DecLTN → SFO
16h 55m · 2 stops
£356one way, per person
View deal
TAP Air PortugalDepart06:00
Mon 7 DecLHR → SFO
15h 35m · 1 stop
£385one way, per person
View deal
TAP Air PortugalDepart06:00
Wed 9 DecLHR → SFO
15h 35m · 1 stop
£386one way, per person
View deal
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Getting around
About flights from London to San Francisco
London (LON) and San Francisco (SFO) are about 8,620 km apart. We haven't seen direct fares on this route recently, so expect at least one stop; the quickest journey we've seen takes about 15h 35m. Over the next few months, one-way fares start from £303, and December 2026 is currently the cheapest month to fly.
These prices come from searches travellers made in the last 48 hours, so they move quickly. If you see a good fare, it's worth booking soon. FlightsExp is free to use: you book directly with our travel partner.
Frequently asked questions
How much is a flight from London to San Francisco?
The cheapest one-way fare we've seen recently is £303 with Ryanair, departing Friday, 11 December 2026. Over the coming months, the lowest fare in each month ranges from £303 to £375.
What is the cheapest month to fly from London to San Francisco?
December 2026 currently has the lowest fares, from £303 one way.
Are there direct flights from London to San Francisco?
We haven't seen direct fares recently, so most journeys include at least one stop.
How long is the flight from London to San Francisco?
The quickest journey we've seen takes about 15h 35m. London and San Francisco are around 8,620 km apart.
Which airlines fly from London to San Francisco?
Recent fares on this route were with Norse Atlantic UK, Ryanair, Wizz Air UK, SWISS and TAP Air Portugal.
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