Cheap flights from London Heathrow Airport to Bangkok from $509

The month of May is, on average, the cheapest month to fly to Bangkok from London Heathrow Airport, with most prices found around $1,109. The month of September is another great option to travel to Bangkok, with average flight prices from London Heathrow Airport averaging around $1,157.

The cheapest day to depart on your flight to Bangkok is on a Monday when prices can be found for as low as $1,331. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Saturday because tickets tend to average around $2,971. These prices are subject to change though, so be sure to set up a Price Alert for flights to Bangkok.

Flying to Bangkok from London Heathrow Airport in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $1,071 when looking at flights departing in the afternoon. Flights to Bangkok are more costly in the morning, with an average ticket price of $2,249. Departure times in the morning fall within the peak daily travel times, which is why tickets can be more expensive.

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 $1,337 when searching weeks before you fly. 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 $1,266 on momondo.

There are 2 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.

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 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 4% of their flights experiencing any sort of delay.

9 flights are operational daily from London Heathrow Airport to Bangkok as of September 2026. The most popular departure time for this route is 21:00, with 66% of flights per day 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.