Find Cheap Flights from London to Siem Reap, Cambodia | Cheapflights

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Cheap flight deals from London to Siem Reap

Popular in	December
Cheapest in	September
Average price	£681

Highest demand for flights based on searches. 5% potential increase in price (£36 potential increase over avg. return price).

Cheapest flight prices on average. 4% potential price decrease (£25 potential savings vs. average return price).

Average for round-trip flights in September 2025

Best time to book a flight from London to Siem Reap

Have a flexible travel schedule? Discover the best time to fly to Siem Reap from London with our price prediction graph.

Estimated return price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from London to Siem Reap

Prices

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How far ahead should I book a flight from London to Siem Reap?

The best time to book flights from London to Siem Reap is 45 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

Reviews of airlines servicing Siem Reap

Read through reviews of airlines operating flights from London to Siem Reap, such as Singapore Airlines, Thai Airways, andVietnam Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Singapore Airlines

8.1

Very Good

Reviews

1 / 20

8.0

Excellent

Anonymous,Dec 2024

NRT - LAX

Crew and in flight experience were great! I felt safe in the plane. Only downside was sitting in economy and the seat/person in front of me who had their seat reclined most of the flight (9 hrs) which made it difficult to eat or be fully comfortable.

Singapore Airlines

8.1

Very Good

Singapore Airlines

8.1

Very Good

Reviews

1 / 20

8.0

Excellent

Anonymous,Dec 2024

NRT - LAX

Crew and in flight experience were great! I felt safe in the plane. Only downside was sitting in economy and the seat/person in front of me who had their seat reclined most of the flight (9 hrs) which made it difficult to eat or be fully comfortable.

7.8

Good

Singapore Airlines

8.1

Very Good

Reviews

1 / 20

8.0

Excellent

Anonymous,Dec 2024

NRT - LAX

Crew and in flight experience were great! I felt safe in the plane. Only downside was sitting in economy and the seat/person in front of me who had their seat reclined most of the flight (9 hrs) which made it difficult to eat or be fully comfortable.

Vietnam Airlines

7.6

Good

Singapore Airlines

8.1

Very Good

Reviews

1 / 20

8.0

Excellent

Anonymous,Dec 2024

NRT - LAX

Crew and in flight experience were great! I felt safe in the plane. Only downside was sitting in economy and the seat/person in front of me who had their seat reclined most of the flight (9 hrs) which made it difficult to eat or be fully comfortable.

British Airways

6.7

Okay

Singapore Airlines

8.1

Very Good

Reviews

1 / 20

8.0

Excellent

Anonymous,Dec 2024

NRT - LAX

Crew and in flight experience were great! I felt safe in the plane. Only downside was sitting in economy and the seat/person in front of me who had their seat reclined most of the flight (9 hrs) which made it difficult to eat or be fully comfortable.

Related info for your journey

What airport do you fly into for flights to Siem Reap from London?
Located just 24.7 mi from the city center, Siem Reap–Angkor Intl is the airport most travelers will use when flying to Siem Reap from London. Booking flights from London to Siem Reap–Angkor Intl (SAI) should be relatively easy as there are 0 daily inbound flights from London from 4 different airlines.
What are the cheapest airlines flying from London to Siem Reap round-trip?
Our cheapest airline available from London to Siem Reap is Vietnam Airlines. Our recent data shows that you can find tickets from as low as £626 on this airline. Additional options worth looking into are Singapore Airlines and Lufthansa, starting at £631 and £727 round-trip. Vietnam Airlines is priced at 25% lower than the current average price of a flight leaving 3 months from now.
Can I find deals for flights from London to Siem Reap that include hotel bookings?
Yes. In addition to deals on London to Siem Reap flights, Cheapflights offers holiday packages that include both flights and hotel.
How can I find direct flights from London to Siem Reap?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from London to Siem Reap.
Can I find deals for business class flights from London to Siem Reap?
Yes. Cheapflights offers flight deals from London to Siem Reap by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

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Complete your trip

Siem Reap car hire

Siem Reap–Angkor Intl Airport car hire

Old French Quarter car hire

Old Market Area car hire

Wat Damnak Area car hire

Taphul Village Area car hire

Wat Bo Area car hire

Wat Polanka Area car hire

Night Market Area car hire

Royal Gardens Area car hire

Phsar Leu Area car hire

Top 4 airlines flying from London to Siem Reap

Airline	Cheapest	Average	Flexibility	On-time
Vietnam Airlines	Cheapest£626	Average£711	FlexibilityNo cancel fee	On-time81%	Search Vietnam Airlines flights
Singapore Airlines	Cheapest£631	Average£776	FlexibilityNo cancel fee	On-time81%	Search Singapore Airlines flights
Lufthansa	Cheapest£727	Average£762	FlexibilityNo cancel fee	On-time76%	Search Lufthansa flights
Thai Airways	Cheapest£816	Average£906	FlexibilityNo cancel fee	On-time77%	Search Thai Airways flights

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When you search for this flight from London to Siem Reap, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.

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