Which airlines fly to Region of Siem Reap?

Singapore Airlines, Vietnam Airlines and Thai Airways are the top three most popular airlines that fly to Region of Siem Reap from London Heathrow Airport according to our data. Singapore Airlines is the first choice among our users, with 46% of people opting to fly with this airline when travelling to Region of Siem Reap. Keep in mind that there are 3 different airlines that fly to Region of Siem Reap on a routine basis, so you have a few additional options to choose from.

What is the cheapest airline that flies from London Heathrow to Siem Reap?

China Eastern is the most popular carrier operating from London Heathrow to Siem Reap

How many operators does momondo search for flights from London Heathrow Airport to Siem Reap?

There are 3 operators available for flights from London Heathrow Airport to Siem Reap as of October 2026.

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

Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from London Heathrow Airport to Siem Reap.

What documentation or ID do you need to fly to Siem Reap?

The required travel and health documents for your Siem Reap 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 Siem Reap. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

£347 Cheap Flights from London Heathrow Airport to Region of Siem Reap in 2026/27

Find the cheapest flights from London Heathrow Airport to Siem Reap

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One-way

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Enter your travel dates to find the best prices.

21:00 - 20:05LHR London Heathrow-SAI Siem Reap–Angkor Intl

40h 05m2 stops Shanghai Pu Dong Kunming Changshui

21:05 - 17:30SAI Siem Reap–Angkor Intl-LHR London Heathrow

51h 25m2 stops Kunming Changshui Shanghai Pu Dong

£621China Eastern

Tue, 10 Nov - Sat, 5 Dec

21:00 - 20:05LHR London Heathrow-SAI Siem Reap–Angkor Intl

40h 05m2 stops Shanghai Pu Dong Kunming Changshui

21:05 - 06:25SAI Siem Reap–Angkor Intl-LHR London Heathrow

40h 20m2 stops Kunming Changshui Shanghai Pu Dong

£621China Eastern

Tue, 10 Nov - Thu, 3 Dec

12:30 - 20:05LHR London Heathrow-SAI Siem Reap–Angkor Intl

48h 35m2 stops Shanghai Pu Dong Kunming Changshui

21:05 - 06:25SAI Siem Reap–Angkor Intl-LHR London Heathrow

40h 20m2 stops Kunming Changshui Shanghai Pu Dong

£622China Eastern

Thu, 3 Dec - Thu, 17 Dec

10:40 - 09:55LHR London Heathrow-SAI Siem Reap–Angkor Intl

16h 15m1 stop Singapore Changi

16:50 - 15:20SAI Siem Reap–Angkor Intl-LHR London Heathrow

29h 30m1 stop Singapore Changi

£751Singapore Airlines

Wed, 13 Jan - Wed, 3 Feb

11:00 - 21:45LHR London Heathrow-SAI Siem Reap–Angkor Intl

27h 45m1 stop Ho Chi Minh City

18:40 - 07:15SAI Siem Reap–Angkor Intl-LHR London Heathrow

19h 35m1 stop Ho Chi Minh City

£751Vietnam Airlines

Thu, 3 Dec - Mon, 21 Dec

11:00 - 21:45LHR London Heathrow-SAI Siem Reap–Angkor Intl

27h 45m1 stop Ho Chi Minh City

21:30 - 07:15SAI Siem Reap–Angkor Intl-LHR London Heathrow

16h 45m1 stop Ho Chi Minh City

£758Vietnam Airlines

Thu, 3 Dec - Wed, 16 Dec

10:40 - 16:00LHR London Heathrow-SAI Siem Reap–Angkor Intl

22h 20m1 stop Singapore Changi

16:50 - 15:20SAI Siem Reap–Angkor Intl-LHR London Heathrow

29h 30m1 stop Singapore Changi

£760Singapore Airlines

Sat, 20 Feb - Mon, 8 Mar

11:00 - 21:45LHR London Heathrow-SAI Siem Reap–Angkor Intl

27h 45m1 stop Ho Chi Minh City

17:55 - 07:15SAI Siem Reap–Angkor Intl-LHR London Heathrow

20h 20m1 stop Hanoi Noibai

£766Vietnam Airlines

Tue, 10 Nov - Thu, 3 Dec

11:50 - 08:45LHR London Heathrow-SAI Siem Reap–Angkor Intl

13h 55m1 stop Bangkok Suvarnabhumi

09:50 - 19:35SAI Siem Reap–Angkor Intl-LHR London Heathrow

16h 45m1 stop Bangkok Suvarnabhumi

£968Thai Airways

Tue, 10 Nov - Sat, 5 Dec

21:35 - 08:45LHR London Heathrow-SAI Siem Reap–Angkor Intl

28h 10m1 stop Bangkok Suvarnabhumi

09:50 - 06:40SAI Siem Reap–Angkor Intl-LHR London Heathrow

27h 50m1 stop Bangkok Suvarnabhumi

£983Thai Airways

Sat, 14 Nov - Sun, 29 Nov

Cheap last-minute flights

Enter your travel dates to find the best prices.

21:00 - 20:05LHR London Heathrow-SAI Siem Reap–Angkor Intl

40h 05m2 stops Shanghai Pu Dong Kunming Changshui

21:05 - 17:30SAI Siem Reap–Angkor Intl-LHR London Heathrow

51h 25m2 stops Kunming Changshui Shanghai Pu Dong

£718China Eastern

Tue, 3 Nov - Sat, 14 Nov

11:00 - 17:40LHR London Heathrow-SAI Siem Reap–Angkor Intl

23h 40m1 stop Ho Chi Minh City

20:30 - 07:15SAI Siem Reap–Angkor Intl-LHR London Heathrow

17h 45m1 stop Hanoi Noibai

£823Vietnam Airlines

Tue, 3 Nov - Sat, 14 Nov

08:25 - 18:30LHR London Heathrow-SAI Siem Reap–Angkor Intl

27h 05m2 stops Muscat Seeb Bangkok Suvarnabhumi

13:20 - 18:25SAI Siem Reap–Angkor Intl-LHR London Heathrow

36h 05m2 stops Bangkok Suvarnabhumi Muscat Seeb

£827Multiple Airlines

Sun, 1 Nov - Mon, 25 Jan

21:40 - 08:00LHR London Heathrow-SAI Siem Reap–Angkor Intl

27h 20m3 stops Manama Bahrain Intl Bengaluru Intl Kolkata Netaji S. Chandra

09:00 - 06:35SAI Siem Reap–Angkor Intl-LHR London Heathrow

28h 35m3 stops Kolkata Netaji S. Chandra Bengaluru Intl Manama Bahrain Intl

£841Multiple Airlines

Tue, 3 Nov - Sat, 14 Nov

06:20 - 16:55LHR London Heathrow-SAI Siem Reap–Angkor Intl

27h 35m2 stops Paris Charles de Gaulle Hanoi Noibai

20:30 - 07:15SAI Siem Reap–Angkor Intl-LHR London Heathrow

17h 45m1 stop Hanoi Noibai

£859Vietnam Airlines

Tue, 3 Nov - Sat, 14 Nov

11:00 - 16:55LHR London Heathrow-SAI Siem Reap–Angkor Intl

22h 55m1 stop Hanoi Noibai

21:30 - 07:15SAI Siem Reap–Angkor Intl-LHR London Heathrow

16h 45m1 stop Ho Chi Minh City

£863Vietnam Airlines

Sun, 1 Nov - Mon, 25 Jan

09:25 - 16:05LHR London Heathrow-SAI Siem Reap–Angkor Intl

23h 40m2 stops Doha Hamad Intl Phuket City

11:20 - 05:55SAI Siem Reap–Angkor Intl-LHR London Heathrow

25h 35m3 stops Phnom Penh Techo Intl Kuala Lumpur Intl Muscat Seeb

£881Multiple Airlines

Tue, 3 Nov - Sat, 14 Nov

12:30 - 08:45LHR London Heathrow-SAI Siem Reap–Angkor Intl

37h 15m2 stops Xiamen Gaoqi Intl Bangkok Suvarnabhumi

09:50 - 19:35SAI Siem Reap–Angkor Intl-LHR London Heathrow

16h 45m1 stop Bangkok Suvarnabhumi

£899Multiple Airlines

Sun, 1 Nov - Mon, 25 Jan

10:40 - 09:55LHR London Heathrow-SAI Siem Reap–Angkor Intl

16h 15m1 stop Singapore Changi

16:50 - 05:55SAI Siem Reap–Angkor Intl-LHR London Heathrow

20h 05m1 stop Singapore Changi

£920Singapore Airlines

Wed, 4 Nov - Tue, 2 Feb

11:00 - 16:10LHR London Heathrow-SAI Siem Reap–Angkor Intl

22h 10m2 stops Hanoi Noibai Luang Prabang

17:05 - 13:45SAI Siem Reap–Angkor Intl-LHR London Heathrow

27h 40m3 stops Luang Prabang Hanoi Noibai Paris Charles de Gaulle

£983Vietnam Airlines

Sun, 1 Nov - Mon, 25 Jan

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China Eastern flights from London Heathrow Airport to Region of Siem Reap

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

China Eastern

10 Nov

LHR21:00London Heathrow

40h 05m

2 stops

SAI20:05Siem Reap–Angkor Intl

3 Dec

SAI21:05Siem Reap–Angkor Intl

40h 20m

2 stops

LHR06:25London Heathrow

£621

China Eastern

3 Dec

LHR12:30London Heathrow

48h 35m

2 stops

SAI20:05Siem Reap–Angkor Intl

17 Dec

SAI21:05Siem Reap–Angkor Intl

40h 20m

2 stops

LHR06:25London Heathrow

£622

China Eastern

29 Nov

LHR21:00London Heathrow

40h 05m

2 stops

SAI20:05Siem Reap–Angkor Intl

6 Dec

SAI21:05Siem Reap–Angkor Intl

27h 25m

2 stops

LHR17:30London Heathrow

£631

Vietnam Airlines flights from London Heathrow Airport to Region of Siem Reap

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

Vietnam Airlines

3 Dec

LHR11:00London Heathrow

27h 45m

1 stop

SAI21:45Siem Reap–Angkor Intl

21 Dec

SAI18:40Siem Reap–Angkor Intl

19h 35m

1 stop

LHR07:15London Heathrow

£751

Vietnam Airlines

3 Dec

LHR11:00London Heathrow

27h 45m

1 stop

SAI21:45Siem Reap–Angkor Intl

16 Dec

SAI21:30Siem Reap–Angkor Intl

16h 45m

1 stop

LHR07:15London Heathrow

£758

Vietnam Airlines

10 Nov

LHR11:00London Heathrow

27h 45m

1 stop

SAI21:45Siem Reap–Angkor Intl

3 Dec

SAI17:55Siem Reap–Angkor Intl

20h 20m

1 stop

LHR07:15London Heathrow

£766

momondo Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

LondonSiem Reap

LHR London Heathrow - SAI Siem Reap–Angkor Intl

LHRSAI

London Heathrow

Tue 10/11

21:00-20:05

2 stops40h 05m

Siem Reap–Angkor Intl

Sat 5/12

21:05-17:30

2 stops51h 25m

£621

LondonSiem Reap

LHR London Heathrow - SAI Siem Reap–Angkor Intl

LHRSAI

London Heathrow

Tue 10/11

21:00-20:05

2 stops40h 05m

Siem Reap–Angkor Intl

Thu 3/12

21:05-06:25

2 stops40h 20m

£621

LondonSiem Reap

LHR London Heathrow - SAI Siem Reap–Angkor Intl

LHRSAI

London Heathrow

Thu 3/12

12:30-20:05

2 stops48h 35m

Siem Reap–Angkor Intl

Thu 17/12

21:05-06:25

2 stops40h 20m

£622

LondonSiem Reap

LHR London Heathrow - SAI Siem Reap–Angkor Intl

LHRSAI

London Heathrow

Wed 13/1

10:40-09:55

1 stop16h 15m

Siem Reap–Angkor Intl

Wed 3/2

16:50-15:20

1 stop29h 30m

£751

LondonSiem Reap

LHR London Heathrow - SAI Siem Reap–Angkor Intl

LHRSAI

London Heathrow

Thu 3/12

11:00-21:45

1 stop27h 45m

Siem Reap–Angkor Intl

Mon 21/12

18:40-07:15

1 stop19h 35m

£751

LondonSiem Reap

LHR London Heathrow - SAI Siem Reap–Angkor Intl

LHRSAI

London Heathrow

Thu 3/12

11:00-21:45

1 stop27h 45m

Siem Reap–Angkor Intl

Wed 16/12

21:30-07:15

1 stop16h 45m

£758

LondonSiem Reap

LHR London Heathrow - SAI Siem Reap–Angkor Intl

LHRSAI

London Heathrow

Sat 20/2

10:40-16:00

1 stop22h 20m

Siem Reap–Angkor Intl

Mon 8/3

16:50-15:20

1 stop29h 30m

£760

LondonSiem Reap

LHR London Heathrow - SAI Siem Reap–Angkor Intl

LHRSAI

London Heathrow

Tue 10/11

11:00-21:45

1 stop27h 45m

Siem Reap–Angkor Intl

Thu 3/12

17:55-07:15

1 stop20h 20m

£766

Fastest return journey

LondonSiem Reap

LHR London Heathrow - SAI Siem Reap–Angkor Intl

LHRSAI

London Heathrow

Tue 10/11

11:50-08:45

1 stop13h 55m

Siem Reap–Angkor Intl

Sat 5/12

09:50-19:35

1 stop16h 45m

£968

LondonSiem Reap

LHR London Heathrow - SAI Siem Reap–Angkor Intl

LHRSAI

London Heathrow

Sat 14/11

21:35-08:45

1 stop28h 10m

Siem Reap–Angkor Intl

Sun 29/11

09:50-06:40

1 stop27h 50m

£983

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 London Heathrow Airport to Region of Siem Reap

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

Prices

Airlines

What is the cheapest month to fly to Region of Siem Reap?

If you’re not able to fly to Region of Siem Reap in March, then September is your next best option. Flight prices from London Heathrow Airport to Region of Siem Reap during September average around £696.

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

You could potentially save up to 7% on your flight if you consider stops on a London Heathrow Airport to Region of Siem Reap flight.

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

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

Best price found	£347
Fastest flight time	18h 50m
Direct flights	None

The best one-way flight to Region of Siem Reap from London Heathrow Airport in the past 72 hours is £347. The best return flight deal from London Heathrow Airport to Region of Siem Reap found on momondo in the last 72 hours is £621.

The fastest flight from London Heathrow Airport to Region of Siem Reap takes 18h 50m

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

Search flight deals

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

When did momondo last update prices for flights from London Heathrow Airport to Siem Reap?
Prices for flights from London Heathrow Airport to Siem Reap refresh daily.
How many operators does momondo search for flights from London Heathrow Airport to Siem Reap?
There are 3 operators available for flights from London Heathrow Airport to Siem Reap as of October 2026.
How old do you have to be to fly from London Heathrow Airport to Siem Reap?
Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from London Heathrow Airport to Siem Reap.
What documentation or ID do you need to fly to Siem Reap?
The required travel and health documents for your Siem Reap 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 Siem Reap. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

Best airlines flying from London Heathrow Airport to Region of Siem Reap

Compare and see reviews for airlines that fly from London Heathrow Airport to Region of Siem Reap with momondo

Airline	Rating	Free Cancellation	Price
Singapore Airlines	PriceFrom £666	Free Cancellation	Rating 8.2 1,631 reviews	Search Singapore Airlines flights
Vietnam Airlines	PriceFrom £745	Free Cancellation	Rating 7.7 294 reviews	Search Vietnam Airlines flights
Thai Airways	PriceFrom £892	Free Cancellation	Rating 7.9 433 reviews	Search Thai Airways flights

Why use momondo?

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

It is quick and easy to find London to Siem Reap flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Siem Reap that suits you.

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

Yes. All flights to Siem Reap from London on momondo can be compared and filtered by various policies on offer, including flexible booking.

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

Once all potential London to Siem Reap flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

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

Yes. momondo can track prices for London to Siem Reap flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

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Flights to Siem Reapfrom £539

Cheap flights from London Heathrow Airport to Siem Reap from £347

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China Eastern flights from London Heathrow Airport to Region of Siem Reap

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

Vietnam Airlines flights from London Heathrow Airport to Region of Siem Reap

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

momondo Fare Finder

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

See travel insights to Siem Reap from

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

What is the cheapest month to fly to Region of Siem Reap?

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

What is the cheapest airline that flies from London Heathrow to Siem Reap?

Which airlines fly to Region of Siem Reap?

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

Best price found

Fastest flight time

Direct flights

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

Best airlines flying from London Heathrow Airport to Region of Siem Reap

Compare and see reviews for airlines that fly from London Heathrow Airport to Region of Siem Reap with momondo

Why use momondo?

An easier way to manage your Region of Siem Reap trip

We make it super easy to schedule, organise and travel with friends or family. Trips is free – and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to Siem Reap

Popular Cities in Siem Reap

Popular flights according to clicks in the last 7 days on momondo

London Heathrow Airport flight routes

According to popular flight searches on momondo this year

Region of Siem Reap flight routes

According to popular flight searches on momondo this year

Fly your favourite airline to Siem Reap

Airlines are sorted and displayed according to clicks in the past 7 days on momondo

Cabin classes currently available on flights to Siem Reap

List of cabin classes available on flights landing in Siem Reap. Availability may vary depending on flight origin and airline.

Complete your trip to Siem Reap

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According to popular flight searches on momondo this year