Cheap flights from London Heathrow Airport to Bangkok from $349

If you aren’t able to travel during the month of May, then book flights to Bangkok from London Heathrow Airport during September instead. Flights to Bangkok in September, while not as cheap as those in May, still average around $826.

On average, the least expensive day to fly to Bangkok from London Heathrow Airport is on a Saturday. momondo users have found tickets for Saturday departures for as low as $1,088. However, this price may fluctuate depending on the airline, the season, and holidays. Flights from London Heathrow Airport to Bangkok on a Friday will generally be more expensive and average around $1,229. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

According to our data, the cheapest time of day to fly to Bangkok is in the afternoon. momondo users have found flights departing from London Heathrow Airport to Bangkok in the afternoon for as low as $814. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Try not to purchase tickets in the morning because they tend to be around $1,241. Of course, these prices can vary depending on the time of year and what airport you fly to.

Fly from London Heathrow to Bangkok Suvarnabhumi for the best London Heathrow - Bangkok flight prices

You are more likely to see cheaper flights to Bangkok from London Heathrow Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to Bangkok for around $954 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Bangkok from London Heathrow Airport for as low as $904 on momondo.

There are 3 cabin classes available to choose from on London Heathrow Airport to Bangkok flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Oman Air, ITA Airways, and Vietnam Airlines are the most popular carriers operating from London Heathrow to Bangkok

EVA Air, Thai Airways and Etihad Airways are the top three most popular airlines that fly to Bangkok from London Heathrow Airport according to our data. EVA Air is the first choice among our users, with 41% of people opting to fly with this airline when traveling to Bangkok. Keep in mind that there are 15 different airlines that fly to Bangkok on a routine basis, so you have a few additional options to choose from.

Historically, on average around 10% of flights between London and Bangkok have experienced a delay on any given week. The average delay length over the past 12 months has been 89 minutes.

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

Tuesday is statistically the day of the week which experiences the fewest number of 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 least number of delays on this route over the last 12 months; with about 4% of their flights experiencing any sort of delay.

As of September 2026, there are 9 flights per day flying from London Heathrow Airport to Bangkok. The most common time of day flights depart is 9:00PM, with 66% of flights taking off in the evening.

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