Cheap flights from London to Southeast Asia from £280

The month of May is, on average, the cheapest month to fly to Southeast Asia from London, with most prices found around £384. If you are unable to visit Southeast Asia during the month of May, then departing from London during the month September is also very affordable. Most momondo users find prices during this month for around £547.

Our data shows that Tuesday is the least expensive day to fly to Southeast Asia. Tickets to fly out on this day can be as low as £735. Be sure to avoid booking your departure on a Saturday as prices are generally higher than usual. According to our data, the average ticket price to Southeast Asia on Saturday is £794.

In the evening is the cheapest time of day to fly from London to Southeast Asia when you can find flight prices for as low as £746. 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 £774. 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 £708 when searching weeks before you fly. 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 £665 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.

China Eastern, AirAsia X, and Hainan Airlines are the most popular carriers operating from London to Southeast Asia

Thai Airways, Etihad Airways and Qatar Airways 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 27% of people opting to fly with this airline when travelling to Southeast Asia. Keep in mind that there are 47 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, 55 flights take off from London and land in Southeast Asia each day. The most common flight departure time for this route is 21:00, with 64% of daily flights taking off in the evening.

The number of flights available between London and Southeast Asia is 388 per week as of March 2026. The most frequent departure day is Fri, with 15% of weekly flights leaving on this day.