Cheap flights from London Heathrow Airport to Southeast Asia from $352

The month of November is, on average, the cheapest month to fly to Southeast Asia from London Heathrow Airport, with most prices found around $832. If you don’t want to visit Southeast Asia in November, then you should wait until September to fly from London Heathrow Airport, when ticket prices are also cheap, with an average price of $873.

The cheapest day to depart from London Heathrow Airport to Southeast Asia is on a Tuesday when prices can be found for as low as $1,154. If your travel schedule is flexible, try to avoid departing on a Friday because tickets tend to average around $1,256. These prices are subject to change though, so be sure to set up a Price Alert for flights to Southeast Asia.

In the evening is the cheapest time of day to fly from London Heathrow Airport to Southeast Asia when you can find flight prices for as low as $1,144. Flying to Southeast Asia in the evening is an ideal time because this is during off-peak travel hours. Try not to purchase tickets in the morning because they tend to be around $1,305. Of course, these prices can vary depending on the time of year and what airport you fly to.

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

You are more likely to see cheaper flights to Southeast Asia from London Heathrow Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to Southeast Asia for around $943 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Southeast Asia from London Heathrow Airport for as low as $891 on momondo.

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

Air China, China Southern, and Hainan Airlines are the most popular carriers operating from London Heathrow to Southeast Asia

EVA Air, Thai Airways and Etihad Airways are the top three most popular airlines that fly to Southeast Asia from London Heathrow Airport according to our data. EVA Air is the first choice among our users, with 27% of people opting to fly with this airline when traveling to Southeast Asia. Keep in mind that there are 22 different airlines that fly to Southeast Asia on a routine basis, so you have a few additional options to choose from.

As of August 2026, 56 flights take off from London Heathrow Airport and land in Southeast Asia each day. The most common flight departure time for this route is 10:00PM, with 62% of daily flights taking off in the evening.

393 flights are operational weekly from London Heathrow Airport to Southeast Asia as of August 2026. The most popular departure day for this route is Wed, with 15% of flights per week taking off on this day.