How long is the flight from Siem Reap to London Heathrow Airport?

Airlines like Emirates, Etihad Airways, and Vietnam Airlines fly from Siem Reap to London Heathrow Airport in about 20h 20m. The time it takes to get you to your destination can typically vary by up to 13h 30m. Airlines will cover a distance of 6106 mi. Both multi-stop and direct flights can be found to your destination and back.

In terms of precipitation, rainfall in London Heathrow Airport ranges from 40.0 - 70.0 inches per month. January is typically the wettest month, when rainfall can reach 70.0 mm. July is typically the driest time to visit London Heathrow Airport when rainfall is around 40.0 mm.

If weather is an important factor for your trip to London Heathrow Airport, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 17.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 4.0 C).

What is the cheapest time of day to fly from SAI to LHR?

When flying from Siem Reap to London Heathrow Airport, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

What airport do you fly from for flights from Siem Reap to London Heathrow?

For a flight from Siem Reap to London Heathrow, you will be flying from Siem Reap–Angkor Intl. Siem Reap–Angkor Intl (SAI) is just 24.7 mi from the center of the city. Siem Reap–Angkor Intl is the only Siem Reap airport and it handles 0 outbound flights to London Heathrow per day. 0 airlines have flights to London Heathrow from Siem Reap–Angkor Intl on a regular basis.

Can I find deals for flights from Siem Reap to Heathrow that include hotel bookings?

Yes. In addition to deals on Siem Reap to Heathrow flights, Cheapflights offers holiday packages that include both flights and hotel.

How can I find direct flights from Siem Reap to Heathrow?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Siem Reap to Heathrow.

Can I find deals for business class flights from Siem Reap to Heathrow?

Yes. Cheapflights offers flight deals from Siem Reap to Heathrow by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

£254+ Cheap Flights from Siem Reap, Cambodia to London Heathrow Airport

Cheap flight deals from Siem Reap to Heathrow

Enter your travel dates to find the best prices.

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Cheapest flights from Siem Reap to Heathrow
Explore the most affordable flight options available from Siem Reap to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 23 September 2026.

Wed 4/1119:05 -

2 stops27h 50m

Tue 17/1109:30 -

2 stops23h 30m

Deal found 21/9£692

Sun 20/1213:20 -

2 stops33h 50m

Fri 1/119:00 -

2 stops19h 10m

Deal found 21/9£791

Wed 4/1121:30 -

1 stop16h 45m

Tue 17/1111:00 -

1 stop26h 30m

Deal found 21/9£804

Wed 4/1119:25 -

2 stops29h 45m

Tue 17/1108:50 -

2 stops26h 40m

Deal found 23/9£806

Mon 28/909:40 -

2 stops27h 20m

Fri 2/1014:45 -

2 stops36h 15m

Deal found 20/9£809

Sun 20/1217:55 -

1 stop20h 20m

Fri 1/111:00 -

1 stop25h 40m

Deal found 21/9£858

Find flight deals from Siem Reap to Heathrow

Round-trip from	£692
One-way from	£254

4/11-17/11
4 total stops
51h 20m total
Siem Reap to London

Search Deals

29/11-31/12
2 total stops
30h 10m total
Siem Reap to London

Search Deals

Cheapflights Fare Finder

Use the filters below to find and compare flights from Siem Reap to London Heathrow Airport that are best for you.

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Fly to

Route

Depart

Return

Price

Cheapest return flight

Fastest return journey

Siem ReapLondon

SAI Siem Reap–Angkor Intl - LHR London Heathrow

SAILHR

Siem Reap–Angkor Intl

Mon 2/11

21:30-07:15

1 stop16h 45m

London Heathrow

Wed 31/12

00:00-06:00

Nonstop0h 00m

£314

Siem ReapLondon

SAI Siem Reap–Angkor Intl - LHR London Heathrow

SAILHR

Siem Reap–Angkor Intl

Thu 29/10

17:05-07:15

2 stops21h 10m

London Heathrow

Wed 31/12

00:00-06:00

Nonstop0h 00m

£339

Siem ReapLondon

SAI Siem Reap–Angkor Intl - LHR London Heathrow

SAILHR

Siem Reap–Angkor Intl

Mon 2/11

13:20-13:50

2 stops55h 30m

London Heathrow

Wed 31/12

00:00-06:00

Nonstop0h 00m

£350

Siem ReapLondon

SAI Siem Reap–Angkor Intl - LHR London Heathrow

SAILHR

Siem Reap–Angkor Intl

Sat 16/1

10:00-18:25

3 stops39h 25m

London Heathrow

Wed 31/12

00:00-06:00

Nonstop0h 00m

£377

Siem ReapLondon

SAI Siem Reap–Angkor Intl - LHR London Heathrow

SAILHR

Siem Reap–Angkor Intl

Sat 16/1

20:30-07:15

1 stop17h 45m

London Heathrow

Wed 31/12

00:00-06:00

Nonstop0h 00m

£448

Siem ReapLondon

SAI Siem Reap–Angkor Intl - LHR London Heathrow

SAILHR

Siem Reap–Angkor Intl

Mon 30/11

19:05-18:55

3 stops54h 50m

London Heathrow

Wed 31/12

00:00-06:00

Nonstop0h 00m

£472

Siem ReapLondon

SAI Siem Reap–Angkor Intl - LHR London Heathrow

SAILHR

Siem Reap–Angkor Intl

Wed 4/11

16:50-11:05

3 stops49h 15m

London Heathrow

Wed 31/12

00:00-06:00

Nonstop0h 00m

£487

Siem ReapLondon

SAI Siem Reap–Angkor Intl - LHR London Heathrow

SAILHR

Siem Reap–Angkor Intl

Mon 4/1

19:05-17:50

3 stops29h 45m

London Heathrow

Wed 31/12

00:00-06:00

Nonstop0h 00m

£572

Siem ReapLondon

SAI Siem Reap–Angkor Intl - LHR London Heathrow

SAILHR

Siem Reap–Angkor Intl

Wed 4/11

18:40-07:15

1 stop19h 35m

London Heathrow

Tue 17/11

21:00-20:05

2 stops40h 05m

£734

Siem ReapLondon

SAI Siem Reap–Angkor Intl - LHR London Heathrow

SAILHR

Siem Reap–Angkor Intl

Sun 20/12

13:20-16:10

2 stops33h 50m

London Heathrow

Fri 1/1

19:00-21:10

2 stops19h 10m

£791

Flights are sorted by cheapest return flights first.

Deals found on 19/9

Showing 1-10 of 14 resultsSorted by cheapest first

Best time to book a flight from Siem Reap to Heathrow

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

SAI-LHR

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.

Related info for your journey

What airport do you fly from for flights from Siem Reap to London Heathrow?
For a flight from Siem Reap to London Heathrow, you will be flying from Siem Reap–Angkor Intl. Siem Reap–Angkor Intl (SAI) is just 24.7 mi from the center of the city. Siem Reap–Angkor Intl is the only Siem Reap airport and it handles 0 outbound flights to London Heathrow per day. 0 airlines have flights to London Heathrow from Siem Reap–Angkor Intl on a regular basis.
How long is the flight from Siem Reap to London Heathrow Airport?
Airlines like Emirates, Etihad Airways, and Vietnam Airlines fly from Siem Reap to London Heathrow Airport in about 20h 20m. The time it takes to get you to your destination can typically vary by up to 13h 30m. Airlines will cover a distance of 6106 mi. Both multi-stop and direct flights can be found to your destination and back.
Can I find deals for flights from Siem Reap to Heathrow that include hotel bookings?
Yes. In addition to deals on Siem Reap to Heathrow flights, Cheapflights offers holiday packages that include both flights and hotel.
How can I find direct flights from Siem Reap to Heathrow?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Siem Reap to Heathrow.
Can I find deals for business class flights from Siem Reap to Heathrow?
Yes. Cheapflights offers flight deals from Siem Reap to Heathrow by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

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Cheapflights makes it easy to find Siem Reap to Heathrow flights by helping our users search from 900+ travel sites for deals. We also provide you with filters for cabin, price, airline, airports, number of stops, and many more to narrow down that perfect flight.

Why should you use Cheapflights to find cheap flight tickets from Siem Reap to Heathrow?

Cheapflights helps you find that perfect flight to Heathrow from Siem Reap by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

Can Cheapflights find flights from Siem Reap to Heathrow with no change fees?

Cheapflights does show flights with no change fees to all users. To see these options for flights from Siem Reap to Heathrow, users can toggle the no change fees filter when performing a flight search.

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Cheap flights from Siem Reap, Cambodia to London Heathrow Airport from £254

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 29/11. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Siem Reap to Heathrow

Cheapest flights from Siem Reap to HeathrowExplore the most affordable flight options available from Siem Reap to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 23 September 2026.

Explore the most affordable flight options available from Siem Reap to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 23 September 2026.

Best flights from Siem Reap to HeathrowDiscover carefully curated flight deals from Siem Reap to Heathrow that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 23 September 2026.

Discover carefully curated flight deals from Siem Reap to Heathrow that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 23 September 2026.

Last-minute flights from Siem Reap to HeathrowDiscover last-minute flight deals from Siem Reap to Heathrow. Data last updated 23 September 2026 and is based on user searches.

Discover last-minute flight deals from Siem Reap to Heathrow. Data last updated 23 September 2026 and is based on user searches.

One-way flights from Siem Reap to HeathrowSearch for one-way flight options from Siem Reap to Heathrow. Find affordable one-way fares based on user searches. Data last updated 23 September 2026.

Search for one-way flight options from Siem Reap to Heathrow. Find affordable one-way fares based on user searches. Data last updated 23 September 2026.

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Best time to book a flight from Siem Reap to Heathrow

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Related info for your journey

What airport do you fly from for flights from Siem Reap to London Heathrow?

How long is the flight from Siem Reap to London Heathrow Airport?

Can I find deals for flights from Siem Reap to Heathrow that include hotel bookings?

How can I find direct flights from Siem Reap to Heathrow?

Can I find deals for business class flights from Siem Reap to Heathrow?

Travelling to a place near London Heathrow Airport?

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Siem Reap to Heathrow

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Direct flights to England

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Other flights to Heathrow

Explore flights to Heathrow departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on 23 September 2026.

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Can Cheapflights notify me if prices for flights from Siem Reap to Heathrow become cheaper?

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Cheapest flights from Siem Reap to Heathrow
Explore the most affordable flight options available from Siem Reap to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 23 September 2026.

Best flights from Siem Reap to Heathrow
Discover carefully curated flight deals from Siem Reap to Heathrow that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 23 September 2026.

Last-minute flights from Siem Reap to Heathrow
Discover last-minute flight deals from Siem Reap to Heathrow. Data last updated 23 September 2026 and is based on user searches.

One-way flights from Siem Reap to Heathrow
Search for one-way flight options from Siem Reap to Heathrow. Find affordable one-way fares based on user searches. Data last updated 23 September 2026.