Cheap flights from Heathrow to Siem Reap

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How to find the cheapest flight from
Heathrow (LHR) to Siem Reap (REP)

All the information you need to plan the best LHR to REP flight in 2021: compare Heathrow to Siem Reap flight prices with the expected peak season, weather and rainfall in Siem Reap.
LHR - REP
Price
£485 - £729

Popular in

December

High demand for flights, 25% potential price rise

Cheapest in

September

Best time to find cheap flights, 11% potential price drop

Average price

£531

Average for round-trip flights in April 2021

Round-trip from

£485

From Heathrow to Siem Reap

Flight route prices based on searches on Cheapflights within the last 3 days, monthly prices based on aggregated historical data.
How far in advance should I book a flight from Heathrow to Siem Reap?

Travellers have found it’s best to book a flight 58 days in advance to save up to 6% compared to booking the same week of travel. As your travel date approaches, the cost of this flight route may potentially increase. While opting to book 58 days out may not be an option for all, there are still additional ways to secure a deal in the near future. You might find a flight from Heathrow to Siem Reap 1-2 weeks in advance for as low as £579, or £579 for flights within the next 24 hours.

What is the cheapest month to fly from Heathrow to Siem Reap?

Flights from Heathrow to Siem Reap lean towards being more expensive in December. Prices are generally better when you fly from Heathrow to Siem Reap in September, with the cheapest ticket starting at £316.

Heathrow to Siem Reap 2021 flight deals

Cheap flights to Siem Reap from Heathrow found for this year
2 Oct - 17 Oct
£673pp
LHR
London Heathrow
Multiple airlines
   
2 STOPS
REP
Siem Reap
REP
Siem Reap
Multiple Airlines
   
2 STOPS
LHR
London Heathrow
13 Jul - 27 Jul
£681pp
LHR
London Heathrow
Multiple airlines
 
1 STOP
REP
Siem Reap
REP
Siem Reap
Multiple Airlines
 
1 STOP
LHR
London Heathrow
6 Nov - 21 Nov
£712pp
LHR
London Heathrow
Multiple airlines
     
3 STOPS
REP
Siem Reap
REP
Siem Reap
Multiple Airlines
   
2 STOPS
LHR
London Heathrow

Related info for your journey

Useful info, stats and facts about <span class="emphasized">Heathrow</span> to <span class="emphasized">Siem Reap</span> flights.

Flight FAQs

From Heathrow to Siem Reap

Are flight prices decreasing from Heathrow to Siem Reap due to COVID-19 (coronavirus)?

At this time, Cheapflights has noticed price decreases for many domestic flights due to COVID-19. Travel is not necessarily recommended at this time, and flights may be prone to cancellation: please check with local authorities in both Heathrow and Siem Reap for travel alerts, and be sure to review the airline's cancellation policy and travel advisories before booking. For more information, please view our post on what to know about COVID-19 (coronavirus) and travel.

Which airlines flying from London Heathrow to Siem Reap have flexible cancellations due to COVID-19?

Some of our airline partners flying from London Heathrow to Siem Reap have new flexible policies in place due to COVID-19. Thai Airways, China Southern, and Vietnam Airlines are some of the carriers where you may find flexible cancellation policies. You can use our site to filter for airlines like Thai Airways with this kind of flexibility.

Can I find flights from Heathrow to Siem Reap for under £728 on Cheapflights?

Yes, there are multiple flights from Heathrow to Siem Reap for under £728. The cheapest flight booked recently is on Multiple Airlines for just £673, but on average you can expect to pay £1,644.

Are there direct flights from Heathrow to Siem Reap for under £655 on Cheapflights?

There are no direct flights from Heathrow to Siem Reap, but Cheapflights can provide you with all the information you need to find the fastest route with the fewest stops.

Alternative routes for Heathrow to Siem Reap

See prices for flight routes from nearby airports that may be better suited for you.

Destination information for Siem Reap

Things to know before you go - useful duration and weather info for your trip from Heathrow to Siem Reap.
Today's exchange rate
£1 = 5,519.39៛

Airports servicing London

Airports servicing Siem Reap

Top 5 airlines flying from Heathrow to Siem Reap

The chart below displays the airlines Cheapflights users travelling from Heathrow to Siem Reap choose most often. Cheapest and average prices are based on aggregated data from the past 12 months.
Airline Cheapest Average Flexibility On-time COVID-19 safety
China Southern
£456 £739 No cancel fee 69%

We couldn't confirm the COVID-19 safety measures taken by China Southern. Please check directly on their website for additional information.

Search China Southern flights
Thai Airways
£629 £797 No cancel fee 77%
Search Thai Airways flights
Singapore Airlines
£617 £854 No cancel fee 81%
Search Singapore Airlines flights
Vietnam Airlines
£657 £856 No cancel fee 81%
Search Vietnam Airlines flights
Cathay Pacific
£683 £876 No cancel fee 72%
Search Cathay Pacific flights
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