When did momondo last update prices for flights from Siem Reap to London Heathrow Airport?

Prices for flights from Siem Reap to London Heathrow Airport are updated daily.

How old do you have to be to fly from Siem Reap to London Heathrow Airport?

The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Siem Reap to London Heathrow Airport.

What documentation or ID do you need to fly to London Heathrow Airport?

The required travel and health documents for your London Heathrow Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at London Heathrow Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

£247 Cheap Flights from Region of Siem Reap to London Heathrow Airport in 2026

Find the cheapest flights from Siem Reap to London

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One-way

Cheap return flights

Enter your travel dates to find the best prices.

23:50 - 18:40SAI Siem Reap–Angkor Intl-LHR London Heathrow

24h 50m2 stops Bangkok Suvarnabhumi Dubai Intl

16:50 - 12:15LHR London Heathrow-SAI Siem Reap–Angkor Intl

37h 25m2 stops Dubai Intl Bangkok Suvarnabhumi

£693Emirates

Thu, 24 Sep - Sat, 3 Oct

12:55 - 18:40SAI Siem Reap–Angkor Intl-LHR London Heathrow

35h 45m2 stops Bangkok Suvarnabhumi Dubai Intl

16:50 - 12:15LHR London Heathrow-SAI Siem Reap–Angkor Intl

37h 25m2 stops Dubai Intl Bangkok Suvarnabhumi

£715Emirates

Fri, 25 Sep - Sat, 3 Oct

09:35 - 06:30SAI Siem Reap–Angkor Intl-LHR London Heathrow

26h 55m3 stops Ho Chi Minh City Singapore Changi Muscat Seeb

20:50 - 14:50LHR London Heathrow-SAI Siem Reap–Angkor Intl

36h 00m3 stops Muscat Seeb Singapore Changi Kuala Lumpur Intl

£745Multiple Airlines

Thu, 24 Sep - Sat, 3 Oct

09:40 - 15:20SAI Siem Reap–Angkor Intl-LHR London Heathrow

35h 40m2 stops Bangkok Suvarnabhumi Manama Bahrain Intl

20:10 - 06:20LHR London Heathrow-SAI Siem Reap–Angkor Intl

28h 10m3 stops Mumbai Chhatrapati Shivaji Intl Hyderabad Rajiv Gandhi Intl Kolkata Netaji S. Chandra

£768Multiple Airlines

Fri, 25 Sep - Sat, 3 Oct

09:35 - 06:30SAI Siem Reap–Angkor Intl-LHR London Heathrow

26h 55m3 stops Ho Chi Minh City Singapore Changi Muscat Seeb

20:50 - 09:15LHR London Heathrow-SAI Siem Reap–Angkor Intl

30h 25m3 stops Muscat Seeb Singapore Changi Kuala Lumpur Intl

£775Multiple Airlines

Fri, 25 Sep - Sat, 3 Oct

12:55 - 15:20SAI Siem Reap–Angkor Intl-LHR London Heathrow

32h 25m2 stops Bangkok Suvarnabhumi Manama Bahrain Intl

20:50 - 06:20LHR London Heathrow-SAI Siem Reap–Angkor Intl

27h 30m3 stops Muscat Seeb New Delhi Indira Gandhi Intl Kolkata Netaji S. Chandra

£778Multiple Airlines

Thu, 24 Sep - Sat, 3 Oct

09:40 - 15:20SAI Siem Reap–Angkor Intl-LHR London Heathrow

35h 40m2 stops Bangkok Suvarnabhumi Manama Bahrain Intl

12:30 - 12:15LHR London Heathrow-SAI Siem Reap–Angkor Intl

17h 45m1 stop Bangkok Suvarnabhumi

£917Multiple Airlines

Thu, 24 Sep - Sat, 3 Oct

09:40 - 15:20SAI Siem Reap–Angkor Intl-LHR London Heathrow

35h 40m2 stops Bangkok Suvarnabhumi Manama Bahrain Intl

12:30 - 12:15LHR London Heathrow-SAI Siem Reap–Angkor Intl

17h 45m1 stop Bangkok Suvarnabhumi

£922Multiple Airlines

Fri, 25 Sep - Sat, 3 Oct

09:40 - 19:20SAI Siem Reap–Angkor Intl-LHR London Heathrow

15h 40m1 stop Bangkok Suvarnabhumi

21:35 - 18:55LHR London Heathrow-SAI Siem Reap–Angkor Intl

15h 20m1 stop Bangkok Suvarnabhumi

£989Multiple Airlines

Thu, 24 Sep - Sat, 3 Oct

19:35 - 19:20SAI Siem Reap–Angkor Intl-LHR London Heathrow

29h 45m1 stop Bangkok Suvarnabhumi

21:35 - 18:55LHR London Heathrow-SAI Siem Reap–Angkor Intl

15h 20m1 stop Bangkok Suvarnabhumi

£1,091Multiple Airlines

Fri, 25 Sep - Sat, 3 Oct

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Emirates flights from Region of Siem Reap to London Heathrow Airport

Our best Emirates deals on Region of Siem Reap to London Heathrow Airport flight tickets

Emirates

24 Sept

SAI23:50Siem Reap–Angkor Intl

24h 50m

2 stops

LHR18:40London Heathrow

3 Oct

LHR16:50London Heathrow

37h 25m

2 stops

SAI12:15Siem Reap–Angkor Intl

£693

Emirates

25 Sept

SAI12:55Siem Reap–Angkor Intl

35h 45m

2 stops

LHR18:40London Heathrow

3 Oct

LHR16:50London Heathrow

37h 25m

2 stops

SAI12:15Siem Reap–Angkor Intl

£715

momondo Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

Siem ReapLondon

SAI Siem Reap–Angkor Intl - LHR London Heathrow

SAILHR

Siem Reap–Angkor Intl

Thu 24/9

23:50-18:40

2 stops24h 50m

London Heathrow

Sat 3/10

16:50-12:15

2 stops37h 25m

£693

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

£715

Siem ReapLondon

SAI Siem Reap–Angkor Intl - LHR London Heathrow

SAILHR

Siem Reap–Angkor Intl

Thu 24/9

09:35-06:30

3 stops26h 55m

London Heathrow

Sat 3/10

20:50-14:50

3 stops36h 00m

£745

Siem ReapLondon

SAI Siem Reap–Angkor Intl - LHR London Heathrow

SAILHR

Siem Reap–Angkor Intl

Fri 25/9

09:40-15:20

2 stops35h 40m

London Heathrow

Sat 3/10

20:10-06:20

3 stops28h 10m

£768

Siem ReapLondon

SAI Siem Reap–Angkor Intl - LHR London Heathrow

SAILHR

Siem Reap–Angkor Intl

Fri 25/9

09:35-06:30

3 stops26h 55m

London Heathrow

Sat 3/10

20:50-09:15

3 stops30h 25m

£775

Siem ReapLondon

SAI Siem Reap–Angkor Intl - LHR London Heathrow

SAILHR

Siem Reap–Angkor Intl

Thu 24/9

12:55-15:20

2 stops32h 25m

London Heathrow

Sat 3/10

20:50-06:20

3 stops27h 30m

£778

Siem ReapLondon

SAI Siem Reap–Angkor Intl - LHR London Heathrow

SAILHR

Siem Reap–Angkor Intl

Thu 24/9

09:40-15:20

2 stops35h 40m

London Heathrow

Sat 3/10

12:30-12:15

1 stop17h 45m

£917

Siem ReapLondon

SAI Siem Reap–Angkor Intl - LHR London Heathrow

SAILHR

Siem Reap–Angkor Intl

Fri 25/9

09:40-15:20

2 stops35h 40m

London Heathrow

Sat 3/10

12:30-12:15

1 stop17h 45m

£922

Fastest return journey

Siem ReapLondon

SAI Siem Reap–Angkor Intl - LHR London Heathrow

SAILHR

Siem Reap–Angkor Intl

Thu 24/9

09:40-19:20

1 stop15h 40m

London Heathrow

Sat 3/10

21:35-18:55

1 stop15h 20m

£989

Siem ReapLondon

SAI Siem Reap–Angkor Intl - LHR London Heathrow

SAILHR

Siem Reap–Angkor Intl

Fri 25/9

19:35-19:20

1 stop29h 45m

London Heathrow

Sat 3/10

21:35-18:55

1 stop15h 20m

£1,091

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from Region of Siem Reap to London Heathrow Airport

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Can stopping save me money on Region of Siem Reap to London Heathrow Airport flights?

You could potentially save up to 21% on your flight if you consider stops on a Region of Siem Reap to London Heathrow Airport flight.

Cheap Region of Siem Reap to London Heathrow Airport flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Region of Siem Reap to London Heathrow Airport

Best price found	£247
Fastest flight time	29h 35m
Direct flights	None

The best one-way flight to London Heathrow Airport from Region of Siem Reap in the past 72 hours is £247. The best return flight deal from Region of Siem Reap to London Heathrow Airport found on momondo in the last 72 hours is £693.

The fastest flight from Region of Siem Reap to London Heathrow Airport takes 29h 35m

There are no direct flights from Region of Siem Reap to London Heathrow Airport. There are no popular flight routes from Region of Siem Reap to London Heathrow Airport.

Search flight deals

Frequently asked questions about flying from Siem Reap to London Heathrow Airport

When did momondo last update prices for flights from Siem Reap to London Heathrow Airport?
Prices for flights from Siem Reap to London Heathrow Airport are updated daily.
How old do you have to be to fly from Siem Reap to London Heathrow Airport?
The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Siem Reap to London Heathrow Airport.
What documentation or ID do you need to fly to London Heathrow Airport?
The required travel and health documents for your London Heathrow Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at London Heathrow Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

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Why should I use momondo to find a flight deal from Siem Reap to London?

Finding the right flight to London from Siem Reap is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to London quick and easy, saving you time and money.

Can I find flights from Siem Reap to London with flexible booking policies on momondo?

Yes. momondo allows you to filter the results for Siem Reap to London flights to just show those with flexible booking policies.

How can momondo help me find flights from Siem Reap to London?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Siem Reap to London.

I’m not ready to book a flight from Siem Reap to London right now. Can momondo alert me if prices change?

Price alerts on flights to London from Siem Reap are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.