Cheap Flights from London to San Francisco
No deal from London to San Francisco has cleared our price bar yet. What we have seen on the route is below.
Across 3 months of observations from London to San Francisco, the lowest round-trip fare we recorded was $502, in September. The typical fare was $597. September was the cheapest month we saw and October the dearest.
The most recent price we saw on this route was $902 on Alaska, seen Oct 15. It is an unverified observation and may have changed.
See every deal <a href="/from/london">from London</a>, <a href="/to/san-francisco">to San Francisco</a>, or the return direction <a href="/from/san-francisco/to/london">San Francisco to London</a>.
Latest price we saw: London to San Francisco
The most recent round-trip fare our sweep found on this route. It is not verified and may have changed since the date shown.
| From | Price | Per mile | Travel dates | Airline | Seen | Check price |
|---|---|---|---|---|---|---|
| London (LHR) to San Francisco (SFO) | $902 | 8.4¢ | Oct 22 – Oct 28 | Alaska | Oct 15 | Check price |
Price history: London to San Francisco
What we observed by month, from our signals database. Unverified observations, not bookable prices.
| Month | Low | Typical | Sightings |
|---|---|---|---|
| Oct 2026 | $576 | $685 | 3 |
| Sep 2026 | $502 | $522 | 2 |
| Aug 2026 | $547 | $583 | 9 |
Frequently asked questions
How many flight deals from London to San Francisco are on Sparkflights right now?
There are 0 verified deals from London to San Francisco on the board right now. The list refreshes hourly.
What is the lowest price ever seen from London to San Francisco?
The lowest fare we've recorded from London to San Francisco is $502, based on 14 price observations over 3 months.
How much does a flight from London to San Francisco cost?
The typical round-trip fare we observed from London to San Francisco is $597, against a recorded low of $502. These are observations, not quotes.
When is the cheapest month to fly London to San Francisco?
September was the cheapest month we observed from London to San Francisco and October the dearest, over 3 months of data.
What is the current price from London to San Francisco?
The most recent fare our sweep saw from London to San Francisco is $902, on Oct 15. It is an unverified observation rather than a verified deal, so check it before booking.