Cheap Flights from London to Siem Reap

FAQ

• Which airlines offer direct flights from London to Siem Reap?

  At the moment, you can catch a direct flight from London to Siem Reap with the following airlines, including: Air China IndiGo Selected airlines are based on historical data collected from flight bookings users made on Trip.com within the last 90 days.

• When is the best time to book flights from London to Siem Reap?

  By analyzing data from all airlines on the Trip.com flight calendar, it looks like the best time to book a flight from London to Siem Reap is around 40 days (6 weeks) in advance, and the best time to fly is usually on Tuesday, Wednesday, and Saturday. Tuesday typically offers the cheapest flights for departure, while Saturday offers the best return deals.

• When are flight tickets from London (LON) to Siem Reap (REP) the cheapest?

  The cheapest months to fly from London to Siem Reap is December, when demand for travel is lower.

• Which upcoming date is cheapest to fly from London to Siem Reap on?

  After crunching the numbers on our November flight calendar, it's currently cheapest to fly from London to Siem Reap on November 27, 2025 with Malaysia Airlines, with prices starting at £366.

• Which airports can I fly to for Siem Reap from London?

  You can land at any one of the following hubs in Siem Reap, with Heathrow Airport to Siem Reap Angkor International Airport (LHR-SAI) is by far the most common option on this route: Siem Reap Angkor International Airport (SAI).

• Is there any time difference between London and Siem Reap?

  The time difference between Siem Reap and London is 7h.

• How do I change or cancel my ticket from London to Siem Reap?

  Tickets can only be changed or cancelled if permitted by airline policy. To submit a change or cancellation request, go to the flight bookings page, select the option to change or cancel your booking, choose the relevant passengers and segment, and submit a request. Please note that additional charges may apply according to the airline ticket policy. However, if the flight has been rescheduled and you would like to change or cancel your ticket, you can submit an involuntary cancellation request. For more details about change and cancellation policies, please check the customer support pages.