Cheap flights from London Heathrow Airport to Ko Samui from £385

The cheapest month to fly to Ko Samui from London Heathrow Airport is in November. Flight prices, which tend to average around £798, 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 Heathrow Airport, when ticket prices are also cheap, with an average price of £818.

You are more likely to see cheaper flights to Ko Samui from London Heathrow Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to Ko Samui for around £904 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 Heathrow Airport for as low as £789 on momondo.

You could potentially save up to 36% on your flight if you consider stops on a London Heathrow Airport to Ko Samui flight.

As of May 2026, prices for London Heathrow Airport to Ko Samui flights are approximately 33% more expensive when compared to flights at the same time last year.

Gulf Air and Oman Air are the most popular carriers operating from London Heathrow to Ko Samui

Thai Airways, EVA Air and Singapore Airlines are the top three most popular airlines that fly to Ko Samui from London Heathrow Airport according to our data. Thai Airways is the first choice among our users, with 45% of people opting to fly with this airline when travelling to Ko Samui. Keep in mind that there are 12 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 8% 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 in the evening tend to experience fewer delays. Flights departing in the morning have, in the past, seen delays more frequently in comparison.

Thursday 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 Hong Kong (HKG) offer the lowest average return price of £819.

Flights connecting via Bangkok (BKK) have the shortest average one-way travel time: 15h 56m.

Bangkok (BKK) has the shortest average stopover time for this route: 2h 50m.