Cheap flights from London to Ko Samui from £335

The cheapest month to fly to Ko Samui from London is in November. Flight prices, which tend to average around £801, are often lower during this time because this is during the off-season. If you don’t want to visit Ko Samui in November, then you should wait until June to fly from London, when ticket prices are also cheap, with an average price of £831.

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 £953 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 £741 on momondo.

You could potentially save up to 29% on your flight if you consider stops on a London to Ko Samui flight.

As of October 2026, prices for London to Ko Samui flights are approximately 12% cheaper when compared to flights at the same time last year.

SWISS, Oman Air, and Lufthansa are the most popular carriers operating from London to Ko Samui

Thai Airways, EVA Air and Qatar Airways are the top three most popular airlines that fly to Ko Samui from London according to our data. Thai Airways is the first choice among our users, with 38% 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 9% 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 161 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.

Saturday 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 6% of their flights experiencing any sort of delay.

Bangkok (BKK) was the most common stop: 66% of momondo users choosing one-stop flights on this route connected there.

Flights via Riyadh (RUH) offer the lowest average return price of £377.

Flights connecting via Vienna (VIE) have the shortest average one-way travel time: 13h 05m.

Vienna (VIE) has the shortest average stopover time for this route: 0h 45m.