Cheap flights from London Heathrow Airport to Southeast Asia from £301

The month of November is, on average, the cheapest month to fly to Southeast Asia from London Heathrow Airport, with most prices found around £625. If you are unable to visit Southeast Asia during the month of November, then departing from London Heathrow Airport during the month September is also very affordable. Most momondo users find prices during this month for around £642.

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 £795. 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 £847.

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 £788. 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 £909. 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 £702 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 Heathrow Airport for as low as £662 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.

China Eastern, Shenzhen Airlines, and SWISS are the most popular carriers operating from London Heathrow to Southeast Asia

Etihad Airways, EVA Air and Qatar Airways are the top three most popular airlines that fly to Southeast Asia from London Heathrow Airport according to our data. Etihad Airways is the first choice among our users, with 29% of people opting to fly with this airline when travelling to Southeast Asia. Keep in mind that there are 45 different airlines that fly to Southeast Asia on a routine basis, so you have a few additional options to choose from.

As of July 2026, there are 54 flights per day flying from London Heathrow Airport to Southeast Asia. The most common time of day flights depart is 22:00, with 65% of flights taking off in the evening.

As of July 2026, there are 381 flights per week flying from London Heathrow Airport to Southeast Asia. The most common day of the week flights depart is Mon, with 15% of flights taking off on this day.