Cheap flights from London to Southeast Asia from £289

The month of November is, on average, the cheapest month to fly to Southeast Asia from London, with most prices found around £610. If you are unable to visit Southeast Asia during the month of November, then departing from London during the month September is also very affordable. Most momondo users find prices during this month for around £637.

Our data shows that Monday is the least expensive day to fly to Southeast Asia. Tickets to fly out on this day can be as low as £776. 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 £826.

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 £765. 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 £865. 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 - 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 £699 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 £663 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, Shenzhen Airlines, and Hainan Airlines are the most popular carriers operating from London to Southeast Asia

Etihad Airways, Qatar Airways and Air China are the top three most popular airlines that fly to Southeast Asia from London according to our data. Etihad Airways is the first choice among our users, with 28% of people opting to fly with this airline when travelling to Southeast Asia. Keep in mind that there are 48 different airlines that fly to Southeast Asia on a routine basis, so you have a few additional options to choose from.

As of June 2026, 19 flights take off from London and land in Southeast Asia each day. The most common flight departure time for this route is 22:00, with 63% of daily flights taking off in the evening.

The number of flights available between London and Southeast Asia is 139 per week as of June 2026. The most frequent departure day is Tue, with 15% of weekly flights leaving on this day.