Cheap flights from London Heathrow Airport to Southeast Asia from €338

The cheapest month to fly to Southeast Asia from London Heathrow Airport is in May. Flight prices, which tend to average around €702, are often lower during this time because this is during the off-season. If you’re not able to fly to Southeast Asia in May, then September is your next best option. Flight prices from London Heathrow Airport to Southeast Asia during September average around €702.

The cheapest day to depart from London Heathrow Airport to Southeast Asia is on a Monday. Travellers who choose to depart for Southeast Asia on a Monday will often find tickets for as low as €870. If your travel schedule is flexible, try to avoid departing on a Thursday because tickets tend to average around €1,171. These prices are subject to change though, so be sure to set up a Price Alert for flights to Southeast Asia.

Our most recent data shows that the best time of day to fly to Southeast Asia is in the evening. Flights from London Heathrow Airport to Southeast Asia during this time can be as low as €954. Flights to Southeast Asia are more costly in the morning, with an average ticket price of €1,154. Departure times in the morning fall within the peak daily travel times, which is why tickets can be more expensive.

Fly from London Heathrow to Singapore Changi 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 €814 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 €765 on momondo.

There are 2 cabin classes available to choose from on London Heathrow to Southeast Asia flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

As of March 2026, there are 10 flights per day flying from London Heathrow Airport to Southeast Asia. The most common time of day flights depart is 21:00, with 66% of flights taking off in the evening.

72 flights are operational weekly from London Heathrow Airport to Southeast Asia as of March 2026. The most popular departure day for this route is Thu, with 26% of flights per week taking off on this day.