Cheap flights from London to Southeast Asia from $370

The month of May is, on average, the cheapest month to fly to Southeast Asia from London, with most prices found around $510. If you don’t want to visit Southeast Asia in May, then you should wait until September to fly from London, when ticket prices are also cheap, with an average price of $726.

The cheapest day to depart from London to Southeast Asia is on a Wednesday when prices can be found for as low as $1,010. If your travel schedule is flexible, try to avoid departing on a Thursday because tickets tend to average around $1,132. These prices are subject to change though, so be sure to set up a Price Alert for flights to Southeast Asia.

In the morning is the cheapest time of day to fly from London to Southeast Asia when you can find flight prices for as low as $1,076. Flying to Southeast Asia in the morning is an ideal time because this is during off-peak travel hours. Try not to purchase tickets in the evening because they tend to be around $1,084. Of course, these prices can vary depending on the time of year and what airport you fly to.

Fly from London Gatwick to Bangkok Suvarnabhumi for the best London - Southeast Asia flight prices

You are more likely to see cheaper flights to Southeast Asia from London when booking weeks ahead of your departure date. In general, you can expect to find flights to Southeast Asia for around $940 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 for as low as $884 on momondo.

There are 4 cabin classes available to choose from on London 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 Eastern, and Shenzhen Airlines are the most popular carriers operating from London to Southeast Asia

Thai Airways, EVA Air and Air China are the top three most popular airlines that fly to Southeast Asia from London according to our data. Thai Airways is the first choice among our users, with 33% of people opting to fly with this airline when traveling to Southeast Asia. Keep in mind that there are 26 different airlines that fly to Southeast Asia on a routine basis, so you have a few additional options to choose from.

As of March 2026, 56 flights take off from London and land in Southeast Asia each day. The most common flight departure time for this route is 9:00PM, with 64% of daily flights taking off in the evening.

394 flights are operational weekly from London to Southeast Asia as of March 2026. The most popular departure day for this route is Sat, with 15% of flights per week taking off on this day.