The cheapest London Gatwick to Bangkok return flight on the radar right now is £358, flying with Air China via one or more connections. It covers departures in January 2027, and every dated link below opens that exact LGW–BKK search on Skyscanner. That is roughly 11% below the £404 this route usually costs. Across 79 recorded checks it has ranged between £322 and £752. Our sampling points to January 2027 as the cheapest month to fly London Gatwick to Bangkok.
We do not post a price and leave it to age. Each fare is re-checked against Skyscanner on a schedule and carries the time it was last confirmed. Not flying from London Gatwick? We track 64 other departure cities for Bangkok, listed at the foot of this page.
Cheap fares do not hang around. If this one has already gone, nudge the dates either way by a day or two; London Gatwick to Bangkok is usually still decent value around the same window.