Cheap Flights from London Heathrow to Siem Reap–Angkor from P51,295

Compare London Heathrow to Siem Reap–Angkor flight deals

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Flight deals from London Heathrow to Siem Reap–Angkor

Looking for a cheap last-minute deal or the best return flight from London Heathrow to Siem Reap–Angkor ? Find the lowest prices on one-way and return tickets right here.

Siem Reap.P51,295 per passenger.Departing Wed, 4 Jun, returning Wed, 11 Jun.Return flight with Hainan Airlines and AirAsia.Outbound indirect flight with Hainan Airlines, departs from London Heathrow on Wed, 4 Jun, arriving in Siem Reap–Angkor .Inbound indirect flight with AirAsia, departs from Siem Reap–Angkor on Wed, 11 Jun, arriving in London Heathrow.Price includes taxes and charges.From P51,295, select.

Siem Reap.P51,938 per passenger.Departing Fri, 28 Nov, returning Sun, 21 Dec.Return flight with Vietnam Airlines.Outbound indirect flight with Vietnam Airlines, departs from London Heathrow on Fri, 28 Nov, arriving in Siem Reap–Angkor .Inbound indirect flight with Vietnam Airlines, departs from Siem Reap–Angkor on Sun, 21 Dec, arriving in London Heathrow.Price includes taxes and charges.From P51,938, select.

Siem Reap.P51,938 per passenger.Departing Mon, 1 Dec, returning Wed, 10 Dec.Return flight with Vietnam Airlines.Outbound indirect flight with Vietnam Airlines, departs from London Heathrow on Mon, 1 Dec, arriving in Siem Reap–Angkor .Inbound indirect flight with Vietnam Airlines, departs from Siem Reap–Angkor on Wed, 10 Dec, arriving in London Heathrow.Price includes taxes and charges.From P51,938, select.

Siem Reap.P51,938 per passenger.Departing Sun, 21 Sep, returning Sun, 19 Oct.Return flight with Vietnam Airlines.Outbound indirect flight with Vietnam Airlines, departs from London Heathrow on Sun, 21 Sep, arriving in Siem Reap–Angkor .Inbound indirect flight with Vietnam Airlines, departs from Siem Reap–Angkor on Sun, 19 Oct, arriving in London Heathrow.Price includes taxes and charges.From P51,938, select.

Siem Reap.P51,965 per passenger.Departing Mon, 16 Jun, returning Mon, 7 Jul.Return flight with Vietnam Airlines.Outbound indirect flight with Vietnam Airlines, departs from London Heathrow on Mon, 16 Jun, arriving in Siem Reap–Angkor .Inbound indirect flight with Vietnam Airlines, departs from Siem Reap–Angkor on Mon, 7 Jul, arriving in London Heathrow.Price includes taxes and charges.From P51,965, select.

Siem Reap.P53,045 per passenger.Departing Sat, 1 Nov, returning Sat, 8 Nov.Return flight with Singapore Airlines.Outbound indirect flight with Singapore Airlines, departs from London Heathrow on Sat, 1 Nov, arriving in Siem Reap–Angkor .Inbound indirect flight with Singapore Airlines, departs from Siem Reap–Angkor on Sat, 8 Nov, arriving in London Heathrow.Price includes taxes and charges.From P53,045, select.

Siem Reap.P53,074 per passenger.Departing Sun, 8 Feb, returning Wed, 18 Feb.Return flight with Singapore Airlines.Outbound indirect flight with Singapore Airlines, departs from London Heathrow on Sun, 8 Feb, arriving in Siem Reap–Angkor .Inbound indirect flight with Singapore Airlines, departs from Siem Reap–Angkor on Wed, 18 Feb, arriving in London Heathrow.Price includes taxes and charges.From P53,074, select.

Siem Reap.P53,078 per passenger.Departing Fri, 16 Jan, returning Fri, 30 Jan.Return flight with Singapore Airlines.Outbound indirect flight with Singapore Airlines, departs from London Heathrow on Fri, 16 Jan, arriving in Siem Reap–Angkor .Inbound indirect flight with Singapore Airlines, departs from Siem Reap–Angkor on Fri, 30 Jan, arriving in London Heathrow.Price includes taxes and charges.From P53,078, select.

Find the cheapest month to fly from London Heathrow to Siem Reap–Angkor

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like London Heathrow to Siem Reap–Angkor flights are currently cheapest in June.

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London Heathrow to Siem Reap–Angkor : Alternative routes

Compare routes from London Heathrow to Siem Reap below. You may find an airport to fly into that's cheaper, faster, or easier than Siem Reap–Angkor .

London to Siem Reap: Flight information

The things to know before you go.

Cheapest flight found	P51,270
Cheapest month to fly	June

Finding cheap flights from London Heathrow to Siem Reap–Angkor : Frequently asked questions

How much are return flights from London Heathrow to Siem Reap–Angkor ?

The best price we found for a return flight from London Heathrow to Siem Reap–Angkor is P51,295. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.

Which airlines fly direct from London Heathrow to Siem Reap–Angkor ?

Currently, there are no airlines that fly direct from London Heathrow to Siem Reap–Angkor . But we found flights with one or more stops from P51,295.

How many flights are there a week from London Heathrow to Siem Reap–Angkor ?

As of May 2025, there are no flights flying from London Heathrow to Siem Reap–Angkor .

When is the cheapest time to fly from London Heathrow to Siem Reap–Angkor ?

The cheapest month to fly from London Heathrow to Siem Reap–Angkor is usually May 2025.

Which upcoming date is cheapest to fly from London Heathrow Airport to Siem Reap–Angkor Airport on?

After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from London Heathrow Airport to Siem Reap–Angkor Airport on Wednesday, 4 June 2025.

Can I get a direct flight from London Heathrow Airport to Siem Reap–Angkor Airport?

No airlines currently offer direct flights between London Heathrow Airport and Siem Reap–Angkor Airport. Most routes have one or more stops.

How can I find the best flight deal to Siem Reap–Angkor ?

We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Siem Reap–Angkor but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.

When is the best time to book flights to Siem Reap?

We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to Siem Reap is around 40 days in advance, so don’t leave your flight to the last minute.

Which is the cheapest airline to fly from London Heathrow Airport to Siem Reap–Angkor with?

Currently, Hainan Airlines offers the cheapest flight tickets to Siem Reap–Angkor .

Travelling from London Heathrow Airport (LHR) to Siem Reap-Ankor International Airport (SAI): what you need to know

Siem Reap's timezone is UTC+7, which makes Siem Reap seven hours ahead of London.
Your LHR to SAI flight won't wait if you're running late, so show up at the airport on time. Arrive up to one hour in advance for domestic flights and two hours ahead when you're flying internationally.
During popular months like July, it's a good idea to get to the airport earlier than usual. Arrive two hours before a domestic departure and four hours ahead of an international flight whenever you're flying during peak periods in general.
Consider adding a stopover when booking your ticket from London Heathrow Airport to Siem Reap-Ankor International Airport. Just uncheck 'Direct flights only' to break up your journey, or perhaps explore a new destination along the way. Check out these options between LHR and SAI:
- Suvarnabhumi Airport
- Changi International Airport
- Kuala Lumpur International Airport

How to find the cheapest flights from London Heathrow Airport (LHR) to Siem Reap-Ankor International Airport (SAI)

Currently, P23,904 is the lowest price we've seen for a one-way London Heathrow Airport to Siem Reap-Ankor International Airport flight. The best price for a return ticket is P51,295. Keep in mind that fares may change due to demand at the time of booking.
Don't leave things to the last moment. You're more likely to find cheap tickets from LHR to SAI if you book ahead. Airlines often offer some terrific early bird rates.
The 'Whole month' search function shows you the cheapest flights from London Heathrow Airport to Siem Reap-Ankor International Airport across the entire month. It's a great way to snap up a bargain if your plans are flexible.
You don't need to check back in every day to see if fares have gone down when you create a Price Alert. We'll send you an update as soon as there's a change in price on cheap flights from LHR to SAI.
Lock in the ideal flight for you with the help of the filters. To see the 'Fastest,' 'Best' or 'Cheapest' flights from London Heathrow Airport to Siem Reap-Ankor International Airport, use the 'Sort by' function. You can also filter by airline, departure and arrival times, and journey duration.

Handy information about London Heathrow Airport (LHR)

When it comes to the on-time performance of London Heathrow Airport, 68.18% of flights meet their scheduled arrival time.
To reach London Heathrow Airport from central London, it takes about 55 minutes if you're going by car. This depends on traffic though. It's approximately 31 kilometres from the airport to the city centre.
The journey on public transport takes roughly 1 hour.
Searching for a handy hotel close to LHR? If you're catching an early flight from London Heathrow Airport to Siem Reap-Ankor International Airport, these accommodation options will have you moments from your check-in counter:

Arriving at Siem Reap-Ankor International Airport (SAI)

Step off your London Heathrow Airport to Siem Reap-Ankor International Airport flight and jump into your hotel bed soon after. If you want a comfortable option within easy reach of SAI, unpack your bags at Chansor Community Homestay 18.

Getting from Siem Reap-Ankor International Airport (SAI) to central Siem Reap

Siem Reap-Ankor International Airport to the centre of Siem Reap has a drive time of around 1 hour. It's approximately 48 kilometres away.

When to fly to Siem Reap-Ankor International Airport (SAI)

April is the most popular month for flights from London Heathrow Airport to Siem Reap-Ankor International Airport. For a quieter experience, head to Siem Reap in April.
Before locking in your flight from London Heathrow Airport to Siem Reap-Ankor International Airport, consider the kind of weather you like. March is the warmest month in Siem Reap, with the temperature ranging from 22ºC (72ºF) to 38ºC (100ºF).
Look for cheap tickets from LHR to SAI in January if you like cooler conditions. Temperatures are at their lowest then, ranging between 18ºC (64ºF) and 33ºC (91ºF) on average.

Explore more of Cambodia

Siem Reap has plenty going for it, but there are so many other parts of Cambodia waiting to be explored. Around 225 kilometres south-east of Siem Reap, a trip to Phnom Penh will keep you busy. Check out popular attractions like Royal Palace, Tuol Sleng Genocide Museum and Wat Phnom.
If there's time to check out another major stop in Cambodia, head for Sihanoukville, roughly 306 kilometres south of Siem Reap. Ochheuteal Beach, Wat Leu Temple and Wat Krom Temple are among the biggest draws.