£611 Cheap Flights from London Heathrow (LHR) to Siem Reap–Angkor (SAI)

Q: 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 £611. 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.

Q: 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 £611.

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

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

Q: 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 April 2025.

Q: 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 Sunday, 18 May 2025 .

Q: 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.

Q: 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.

Q: 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.

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

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

Compare London Heathrow to Siem Reap–Angkor flight deals

Find the cheapest month or even day of the year to fly to Siem Reap–Angkor

Book the best Siem Reap–Angkor fare with no extra fees

Flight deals Cheapest month Find the best route Route info FAQs Tips and advice

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.£611 per passenger.Departing Sun, 18 May, returning Tue, 3 Jun.Return flight with KLM and AirAsia.Outbound indirect flight with KLM, departs from London Heathrow on Sun, 18 May, arriving in Siem Reap–Angkor .Inbound indirect flight with AirAsia, departs from Siem Reap–Angkor on Tue, 3 Jun, arriving in London Heathrow.Price includes taxes and charges.From £611, select.

Siem Reap.£616 per passenger.Departing Mon, 5 May, returning Mon, 26 May.Return flight with China Eastern.Outbound indirect flight with China Eastern, departs from London Heathrow on Mon, 5 May, arriving in Siem Reap–Angkor .Inbound indirect flight with China Eastern, departs from Siem Reap–Angkor on Mon, 26 May, arriving in London Heathrow.Price includes taxes and charges.From £616, select.

Siem Reap.£626 per passenger.Departing Tue, 18 Nov, returning Sun, 30 Nov.Return flight with Austrian Airlines and China Eastern.Outbound indirect flight with Austrian Airlines, departs from London Heathrow on Tue, 18 Nov, arriving in Siem Reap–Angkor .Inbound indirect flight with China Eastern, departs from Siem Reap–Angkor on Sun, 30 Nov, arriving in London Heathrow.Price includes taxes and charges.From £626, select.

Siem Reap.£634 per passenger.Departing Wed, 23 Apr, returning Tue, 10 Jun.Return flight with China Eastern and VietJet Air.Outbound indirect flight with China Eastern, departs from London Heathrow on Wed, 23 Apr, arriving in Siem Reap–Angkor .Inbound indirect flight with VietJet Air, departs from Siem Reap–Angkor on Tue, 10 Jun, arriving in London Heathrow.Price includes taxes and charges.From £634, select.

Siem Reap.£651 per passenger.Departing Tue, 17 Jun, returning Wed, 2 Jul.Return flight with Etihad Airways and Thai AirAsia.Outbound indirect flight with Etihad Airways, departs from London Heathrow on Tue, 17 Jun, arriving in Siem Reap–Angkor .Inbound indirect flight with Thai AirAsia, departs from Siem Reap–Angkor on Wed, 2 Jul, arriving in London Heathrow.Price includes taxes and charges.From £651, select.

Siem Reap.£651 per passenger.Departing Mon, 21 Apr, returning Fri, 2 May.Return flight with China Eastern.Outbound indirect flight with China Eastern, departs from London Heathrow on Mon, 21 Apr, arriving in Siem Reap–Angkor .Inbound indirect flight with China Eastern, departs from Siem Reap–Angkor on Fri, 2 May, arriving in London Heathrow.Price includes taxes and charges.From £651, select.

Siem Reap.£657 per passenger.Departing Wed, 4 Jun, returning Sun, 15 Jun.Return flight with Tianjin Airlines and Thai AirAsia.Outbound indirect flight with Tianjin Airlines, departs from London Heathrow on Wed, 4 Jun, arriving in Siem Reap–Angkor .Inbound indirect flight with Thai AirAsia, departs from Siem Reap–Angkor on Sun, 15 Jun, arriving in London Heathrow.Price includes taxes and charges.From £657, select.

Siem Reap.£665 per passenger.Departing Wed, 1 Oct, returning Wed, 15 Oct.Return flight with Oman Air and China Eastern.Outbound indirect flight with Oman Air, departs from London Heathrow on Wed, 1 Oct, arriving in Siem Reap–Angkor .Inbound indirect flight with China Eastern, departs from Siem Reap–Angkor on Wed, 15 Oct, arriving in London Heathrow.Price includes taxes and charges.From £665, 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 May.

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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	£611
Cheapest month to fly	May

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 ?

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

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

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

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

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

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

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

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

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

During popular months such as July, it's a good idea to get to the airport well in advance. Arrive two hours before a domestic departure and four hours ahead of international flights when you fly during peak periods in general.
If you prefer a stopover for your flight from London Heathrow Airport to Siem Reap-Ankor International Airport, simply deselect 'Direct flights only' and check out your options. These are the most popular stopovers between LHR and SAI:
- Kuala Lumpur International Airport
- Changi International Airport
- Suvarnabhumi Airport
Remember, you may need a visa to enter Cambodia. Visa requirements vary and travel documentation requirements are always changing. Before booking your cheap ticket from LHR to SAI, check with your carrier and your destination country's local consulate or embassy for up-to-date information.

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

£292 is the best price for a one-way ticket from London Heathrow Airport to Siem Reap-Ankor International Airport. A return flight starts at £611. These prices may change based on availability and demand.
It's often best to book early if you want to find cheap tickets from LHR to SAI. That's because flight prices are based on demand, which tends to increase closer to departure.
Getting cheap tickets from London Heathrow Airport to Siem Reap-Ankor International Airport is easy if you can be flexible with your travel plans. Try using the 'Whole month' search tool to see the lowest prices across every month and score a great deal.
Set up a Price Alert for cheap tickets from LHR to SAI. There's no need to check back in every day to find out if prices have fallen. We'll update you when there's a change in price.
Use filters to tailor your flights from London Heathrow Airport to Siem Reap-Ankor International Airport. Enter your preferred departure and arrival times, airlines and number of stops. Alternatively, sort your results by 'Cheapest' to get the best deals.

Handy information about London Heathrow Airport (LHR)

The journey from central London to London Heathrow Airport takes around 1 hour and 1 minute by public transport. If you ride-share, drive or take a cab, you'll cover the 19 miles in 57 minutes or so, depending on traffic.
Want a relaxed start to your travels? Stay near LHR. Whether you've booked an early flight from London Heathrow Airport to Siem Reap-Ankor International Airport or just don't want to be rushed, these stays are ideal:

Arriving at Siem Reap-Ankor International Airport (SAI)

Consider checking in to Chansor Community Homestay 18 after touching down from your flight from London Heathrow Airport to Siem Reap-Ankor International Airport. It's not too far from SAI and a great option if you're eager to freshen up right away.

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

From Siem Reap-Ankor International Airport, Siem Reap is approximately 30 miles away. It takes around 59 minutes to get to the centre driving.

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

August is the busiest month for flights from London Heathrow Airport to Siem Reap-Ankor International Airport. To steer clear of the crowds, head to Siem Reap in April.
Book your flight from London Heathrow Airport to Siem Reap-Ankor International Airport for March if you want to go to Siem Reap during its warmest month. Expect temperatures of between 22ºC and 38ºC.
Search for cheap tickets from LHR to SAI in January if you like cooler conditions. Temperatures are at their lowest then, ranging between 18ºC and 33ºC on average.

More about Siem Reap

Start your Siem Reap trip right by finding an amazing place to stay. After booking your flight from LHR to SAI, have a look at our selection of hotel options including:
There are so many things to see and do in this city it can be hard to work out where to begin. Bayon Temple, Angkor Thom and Pub Street are top attractions which should be on every Siem Reap itinerary.

Complete your Siem Reap trip with hotels and a car rental

You've locked in your cheap ticket to Siem Reap-Ankor International Airport — next on the list is finding somewhere to stay, and maybe even your own set of wheels. We've compared prices across hundreds of companies to bring you the best hotels and car rental deals in Siem Reap.

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Plan the rest of your trip from London to Siem Reap

Prices shown on this page are estimated lowest prices only. Found in the last 45 days.