Cheap flights from London Heathrow Airport to Thailand from £286

In general, May is the cheapest month to fly from London Heathrow Airport to Thailand. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around £589. If you are unable to visit Thailand during the month of May, then departing from London Heathrow Airport during the month September is also very affordable. Most momondo users find prices during this month for around £600.

The cheapest day to depart on your flight to Thailand is on a Monday when prices can be found for as low as £766. This is often the case because there is less demand to fly during this day of the week. On the other hand, Saturday is the most expensive day to depart from London Heathrow Airport because it is more convenient for both business and leisure travellers. As a result, prices tend to be around £822.

Our data shows that the cheapest London Heathrow Airport to Thailand flights are usually those with departure times in the evening. Our users have found flights to Thailand in the evening for as low as £767. In contrast, the most expensive time of day to depart to Thailand is in the morning when prices are around £867.

Fly from London Heathrow to Phuket City for the best London Heathrow - Thailand flight prices

You are more likely to see cheaper flights to Thailand from London Heathrow Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to Thailand for around £700 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Thailand from London Heathrow Airport for as low as £663 on momondo.

There are 4 cabin classes available to choose from on London Heathrow Airport to Thailand flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

China Eastern, Qatar Airways, and SWISS are the most popular carriers operating from London Heathrow to Thailand

EVA Air, Thai Airways and Etihad Airways are the top three most popular airlines that fly to Thailand from London Heathrow Airport according to our data. EVA Air is the first choice among our users, with 34% of people opting to fly with this airline when travelling to Thailand. Keep in mind that there are 39 different airlines that fly to Thailand on a routine basis, so you have a few additional options to choose from.

Historically, on average around 14% of flights between London and Thailand have experienced a delay on any given week. The average delay length over the past 12 months has been 87 minutes.

Generally, flights departing in the morning tend to experience fewer delays. Flights departing in the evening have, in the past, seen delays more frequently in comparison.

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

According to our data, EVA Air have had the fewest delays on this route over the last 12 months, with about 7% of their flights experiencing any sort of delay.

As of June 2026, 9 flights take off from London Heathrow Airport and land in Thailand each day. The most common flight departure time for this route is 21:00, with 66% of daily flights taking off in the evening.

As of June 2026, there are 63 flights per week flying from London Heathrow Airport to Thailand. The most common day of the week flights depart is Mon, with 14% of flights taking off on this day.