The cheapest London to Los Angeles return flight on the radar right now is £382, flying with Finnair non-stop. It covers departures in October 2026, and every dated link below opens that exact LHR–LAX search on Skyscanner. The price we usually record on this route is £421. Across 79 recorded checks it has ranged between £348 and £691. Our sampling points to October 2026 as the cheapest month to fly London to Los Angeles.
Prices are re-checked against Skyscanner automatically, and every one shows when it was last confirmed, so nothing here is older than it looks. Not flying from London? We track 60 other departure cities for Los Angeles, listed at the foot of this page.
Prices like this tend to vanish fast. If it has gone when you look, try the days either side of the dates above, since London to Los Angeles is often still worth booking within a day or two of the fare we found.