Cheap flights from London Heathrow Airport to Siem Reap from £351

When did momondo last update prices for flights from London Heathrow Airport to Siem Reap?

Prices for flights from London Heathrow Airport to Siem Reap refresh daily.

How many operators does momondo search for flights from London Heathrow Airport to Siem Reap?

There are 4 operators available for flights from London Heathrow Airport to Siem Reap as of July 2026.

How old do you have to be to fly from London Heathrow Airport to Siem Reap?

Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from London Heathrow Airport to Siem Reap.

What documentation or ID do you need to fly to Siem Reap?

The required travel and health documents for your Siem Reap trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Siem Reap. We recommend that you seek guidance from your airline or a reliable third party such as IATA.