Cheap flights from London Heathrow Airport to Southeast Asia from $510

The cheapest month to fly to Southeast Asia from London Heathrow Airport is in November. Flight prices, which tend to average around $1,175, are often lower during this time because this is during the off-season. The month of September is another great option to travel to Southeast Asia, with average flight prices from London Heathrow Airport averaging around $1,267.

Fly from London Heathrow to Bangkok Suvarnabhumi 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 $1,531 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 $1,435 on momondo.

There are 3 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.

As of September 2026, 54 flights take off from London Heathrow Airport 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 Heathrow Airport and Southeast Asia is 378 per week as of September 2026. The most frequent departure day is Mon, with 15% of weekly flights leaving on this day.