Cheap flights from London to Ko Samui from £293

The cheapest month to fly to Ko Samui from London is in May. Flight prices, which tend to average around £794, are often lower during this time because this is during the off-season. If you don’t want to visit Ko Samui in May, then you should wait until November to fly from London, when ticket prices are also cheap, with an average price of £807.

According to our data, Wednesday is the cheapest day to fly to Ko Samui from London. The lowest ticket price found for a Wednesday departure recently was £495. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. Be sure to avoid booking your departure on a Sunday as prices are generally higher than usual. According to our data, the average ticket price to Ko Samui on Sunday is £844.

Our most recent data shows that the best time of day to fly to Ko Samui is in the afternoon. Flights from London to Ko Samui during this time can be as low as £501. Flights at midday are often more expensive, with an average ticket price of £815.

You are more likely to see cheaper flights to Ko Samui from London when booking weeks ahead of your departure date. In general, you can expect to find flights to Ko Samui for around £909 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Ko Samui from London for as low as £772 on momondo.

You could potentially save up to 26% on your flight if you consider stops on a London to Ko Samui flight.

As of March 2026, prices for London to Ko Samui flights are approximately 10% cheaper when compared to flights at the same time last year.

Etihad Airways, Gulf Air, and Qatar Airways are the most popular carriers operating from London to Ko Samui

EVA Air, Thai Airways and Singapore Airlines are the top three most popular airlines that fly to Ko Samui from London according to our data. EVA Air is the first choice among our users, with 42% of people opting to fly with this airline when travelling to Ko Samui. Keep in mind that there are 13 different airlines that fly to Ko Samui on a routine basis, so you have a few additional options to choose from.

Historically, on average around 10% of flights between London and Ko Samui have experienced a delay on any given week. The average delay length over the past 12 months has been 157 minutes.

Generally, flights departing at night tend to experience fewer delays. Flights departing in the early afternoon have, in the past, seen delays more frequently in comparison.

Wednesday is statistically the day of the week that experiences the fewest delays on this flight route. Sunday has historically seen more delays on average compared to the rest of the week.

According to our data, Virgin Atlantic have had the fewest delays on this route over the last 12 months, with about 5% of their flights experiencing any sort of delay.

Bangkok (BKK) was the most common stop: 76% of momondo users choosing one-stop flights on this route connected there.

Flights via Shanghai (PVG) offer the lowest average return price of £460.

Flights connecting via Rome (FCO) have the shortest average one-way travel time: 14h 35m.

Frankfurt am Main (FRA) has the shortest average stopover time for this route: 2h 13m.