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

Airlines like Emirates fly from Siem Reap to London Heathrow Airport in about 35h 45m. The time it takes to get you to your destination can typically vary by up to . Airlines will cover a distance of 6106 mi.

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.

£229+ 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 12 September 2026.

Thu 24/923:50 -

2 stops24h 50m

Sat 3/1016:50 -

2 stops37h 25m

Deal found 9/9£694

Fri 25/912:55 -

2 stops35h 45m

Sat 3/1016:50 -

2 stops37h 25m

Deal found 9/9£716

Thu 24/909:35 -

3 stops26h 55m

Sat 3/1020:50 -

3 stops36h 00m

Deal found 9/9£746

Mon 7/1221:30 -

1 stop16h 45m

Wed 10/214:50 -

2 stops35h 25m

Deal found 10/9£755

Wed 16/919:35 -

2 stops29h 35m

Wed 23/920:50 -

2 stops33h 25m

Deal found 7/9£768

Fri 25/909:40 -

2 stops35h 40m

Sat 3/1020:10 -

3 stops28h 10m

Deal found 9/9£769

Find flight deals from Siem Reap to Heathrow

Round-trip from	£694
One-way from	£229

Emirates
24/9-3/10
4 total stops
62h 15m total
Siem Reap to London

Search Deals

25/11-31/12
2 total stops
27h 50m 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

Siem ReapLondon

SAI Siem Reap–Angkor Intl - LHR London Heathrow

SAILHR

Siem Reap–Angkor Intl

Tue 24/11

19:05-19:10

3 stops31h 05m

London Heathrow

Wed 31/12

00:00-06:00

Nonstop0h 00m

£294

Siem ReapLondon

SAI Siem Reap–Angkor Intl - LHR London Heathrow

SAILHR

Siem Reap–Angkor Intl

Wed 23/9

12:55-06:55

2 stops24h 00m

London Heathrow

Wed 31/12

00:00-06:00

Nonstop0h 00m

£302

Siem ReapLondon

SAI Siem Reap–Angkor Intl - LHR London Heathrow

SAILHR

Siem Reap–Angkor Intl

Sun 20/9

15:35-19:10

2 stops33h 35m

London Heathrow

Wed 31/12

00:00-06:00

Nonstop0h 00m

£304

Siem ReapLondon

SAI Siem Reap–Angkor Intl - LHR London Heathrow

SAILHR

Siem Reap–Angkor Intl

Fri 25/9

12:55-15:20

2 stops32h 25m

London Heathrow

Wed 31/12

00:00-06:00

Nonstop0h 00m

£324

Siem ReapLondon

SAI Siem Reap–Angkor Intl - LHR London Heathrow

SAILHR

Siem Reap–Angkor Intl

Mon 21/9

12:55-06:55

2 stops24h 00m

London Heathrow

Wed 31/12

00:00-06:00

Nonstop0h 00m

£334

Siem ReapLondon

SAI Siem Reap–Angkor Intl - LHR London Heathrow

SAILHR

Siem Reap–Angkor Intl

Tue 29/12

23:50-16:10

2 stops23h 20m

London Heathrow

Wed 31/12

00:00-06:00

Nonstop0h 00m

£463

Fastest return journey

Siem ReapLondon

SAI Siem Reap–Angkor Intl - LHR London Heathrow

SAILHR

Siem Reap–Angkor Intl

Mon 28/12

19:25-09:10

2 stops20h 45m

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

Thu 31/12

23:50-17:50

3 stops25h 00m

London Heathrow

Wed 31/12

00:00-06:00

Nonstop0h 00m

£496

Siem ReapLondon

SAI Siem Reap–Angkor Intl - LHR London Heathrow

SAILHR

Siem Reap–Angkor Intl

Mon 21/9

19:40-17:50

1 stop28h 10m

London Heathrow

Wed 31/12

00:00-06:00

Nonstop0h 00m

£497

Siem ReapLondon

SAI Siem Reap–Angkor Intl - LHR London Heathrow

SAILHR

Siem Reap–Angkor Intl

Fri 25/9

12:55-18:40

2 stops35h 45m

London Heathrow

Sat 3/10

16:50-12:15

2 stops37h 25m

£716

Flights are sorted by cheapest return flights first.

Deals found on 11/9

Showing 1-10 of 13 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 fly from Siem Reap to London Heathrow Airport in about 35h 45m. The time it takes to get you to your destination can typically vary by up to . Airlines will cover a distance of 6106 mi.
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 £229

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 25/11. 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 12 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 12 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 12 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 12 September 2026.

Last-minute flights from Siem Reap to HeathrowDiscover last-minute flight deals from Siem Reap to Heathrow. Data last updated 12 September 2026 and is based on user searches.

Discover last-minute flight deals from Siem Reap to Heathrow. Data last updated 12 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 12 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 12 September 2026.

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

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.

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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Search flights from Siem Reap to Heathrow by cabin class

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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 12 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 12 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 12 September 2026.

Last-minute flights from Siem Reap to Heathrow
Discover last-minute flight deals from Siem Reap to Heathrow. Data last updated 12 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 12 September 2026.