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 42% of people opting to fly with this airline when travelling to Region of Siem Reap. Keep in mind that there are 5 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?

SWISS and Austrian Airlines are the most popular carriers operating from London Heathrow to Siem Reap

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

There are 5 operators available for flights from London Heathrow Airport to Siem Reap as of April 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.

£383 Cheap Flights from London Heathrow Airport to Region of Siem Reap in 2026

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Find the cheapest flights from London Heathrow Airport to Siem Reap

Round-trip

One-way

Last minute

Cheap return flights

Enter your travel dates to find the best prices.

06:00 - 18:55

LHR

SAI

30h 55m

2 stops

12:55 - 08:20

SAI

LHR

25h 25m

2 stops

£714Austrian Airlines

Fri, 25 Sep - Tue, 29 Sep

06:00 - 18:55

LHR

SAI

30h 55m

2 stops

09:40 - 07:55

SAI

LHR

28h 15m

2 stops

£715SWISS

Sun, 14 Jun - Mon, 6 Jul

10:00 - 21:30

LHR

SAI

29h 30m

2 stops

09:45 - 14:50

SAI

LHR

35h 05m

2 stops

£736Multiple Airlines

Mon, 25 May - Tue, 9 Jun

13:50 - 18:55

LHR

SAI

23h 05m

2 stops

09:40 - 21:45

SAI

LHR

18h 05m

2 stops

£752SWISS

Wed, 26 Aug - Wed, 21 Oct

19:30 - 18:55

LHR

SAI

17h 25m

2 stops

19:35 - 11:25

SAI

LHR

21h 50m

2 stops

£753Multiple Airlines

Fri, 25 Sep - Tue, 29 Sep

22:15 - 21:30

LHR

SAI

41h 15m

2 stops

23:50 - 07:05

SAI

LHR

37h 15m

2 stops

£761Emirates

Sun, 24 May - Tue, 9 Jun

10:00 - 19:05

LHR

SAI

27h 05m

2 stops

19:35 - 15:20

SAI

LHR

49h 45m

2 stops

£762Multiple Airlines

Tue, 9 Jun - Fri, 19 Jun

19:50 - 18:20

LHR

SAI

16h 30m

1 stop

12:55 - 06:55

SAI

LHR

24h 00m

2 stops

£765Multiple Airlines

Tue, 9 Jun - Fri, 19 Jun

19:50 - 18:20

LHR

SAI

16h 30m

1 stop

13:05 - 06:55

SAI

LHR

23h 50m

2 stops

£769Multiple Airlines

Tue, 26 May - Wed, 10 Jun

21:45 - 09:00

LHR

SAI

29h 15m

2 stops

15:10 - 15:05

SAI

LHR

29h 55m

2 stops

£769Multiple Airlines

Fri, 15 May - Tue, 9 Jun

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Emirates flights from London Heathrow Airport to Region of Siem Reap

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

Emirates

30 Apr

LHR20:40London Heathrow

42h 50m

2 stops

SAI21:30Siem Reap–Angkor Intl

19 May

SAI23:50Siem Reap–Angkor Intl

26h 25m

2 stops

LHR20:15London Heathrow

£758

Emirates

24 May

LHR22:15London Heathrow

41h 15m

2 stops

SAI21:30Siem Reap–Angkor Intl

9 Jun

SAI23:50Siem Reap–Angkor Intl

37h 15m

2 stops

LHR07:05London Heathrow

£761

Emirates

5 May

LHR22:15London Heathrow

41h 15m

2 stops

SAI21:30Siem Reap–Angkor Intl

26 May

SAI23:50Siem Reap–Angkor Intl

37h 15m

2 stops

LHR07:05London Heathrow

£761

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

14 Jun

LHR19:50London Heathrow

15h 20m

1 stop

SAI17:10Siem Reap–Angkor Intl

5 Jul

SAI18:05Siem Reap–Angkor Intl

29h 00m

1 stop

LHR17:05London Heathrow

£776

Vietnam Airlines

26 May

LHR19:50London Heathrow

16h 30m

1 stop

SAI18:20Siem Reap–Angkor Intl

10 Jun

SAI19:10Siem Reap–Angkor Intl

27h 45m

1 stop

LHR16:55London Heathrow

£794

Vietnam Airlines

16 Jun

LHR19:50London Heathrow

20h 05m

1 stop

SAI21:55Siem Reap–Angkor Intl

6 Jul

SAI19:10Siem Reap–Angkor Intl

28h 40m

1 stop

LHR17:50London Heathrow

£804

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 - SAI

LHRSAI

London Heathrow

Fri 25/9

06:00-18:55

2 stops30h 55m

Siem Reap–Angkor Intl

Tue 29/9

12:55-08:20

2 stops25h 25m

£714

LondonSiem Reap

LHR - SAI

LHRSAI

London Heathrow

Sun 14/6

06:00-18:55

2 stops30h 55m

Siem Reap–Angkor Intl

Mon 6/7

09:40-07:55

2 stops28h 15m

£715

LondonSiem Reap

LHR - SAI

LHRSAI

London Heathrow

Mon 25/5

10:00-21:30

2 stops29h 30m

Siem Reap–Angkor Intl

Tue 9/6

09:45-14:50

2 stops35h 05m

£736

LondonSiem Reap

LHR - SAI

LHRSAI

London Heathrow

Wed 26/8

13:50-18:55

2 stops23h 05m

Siem Reap–Angkor Intl

Wed 21/10

09:40-21:45

2 stops18h 05m

£752

Fastest return journey

LondonSiem Reap

LHR - SAI

LHRSAI

London Heathrow

Fri 25/9

19:30-18:55

2 stops17h 25m

Siem Reap–Angkor Intl

Tue 29/9

19:35-11:25

2 stops21h 50m

£753

LondonSiem Reap

LHR - SAI

LHRSAI

London Heathrow

Sun 24/5

22:15-21:30

2 stops41h 15m

Siem Reap–Angkor Intl

Tue 9/6

23:50-07:05

2 stops37h 15m

£761

LondonSiem Reap

LHR - SAI

LHRSAI

London Heathrow

Tue 9/6

10:00-19:05

2 stops27h 05m

Siem Reap–Angkor Intl

Fri 19/6

19:35-15:20

2 stops49h 45m

£762

LondonSiem Reap

LHR - SAI

LHRSAI

London Heathrow

Tue 9/6

19:50-18:20

1 stop16h 30m

Siem Reap–Angkor Intl

Fri 19/6

12:55-06:55

2 stops24h 00m

£765

LondonSiem Reap

LHR - SAI

LHRSAI

London Heathrow

Tue 26/5

19:50-18:20

1 stop16h 30m

Siem Reap–Angkor Intl

Wed 10/6

13:05-06:55

2 stops23h 50m

£769

LondonSiem Reap

LHR - SAI

LHRSAI

London Heathrow

Fri 15/5

21:45-09:00

2 stops29h 15m

Siem Reap–Angkor Intl

Tue 9/6

15:10-15:05

2 stops29h 55m

£769

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 June is your next best option. Flight prices from London Heathrow Airport to Region of Siem Reap during June average around £549.

How far in advance should I book a flight from London Heathrow Airport to Siem Reap?

You are more likely to see cheaper flights to Region of Siem Reap from London Heathrow Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to Region of Siem Reap for around £820 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Region of Siem Reap from London Heathrow Airport for as low as £591 on momondo.

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

You could potentially save up to 13% 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

Fastest flight time	15h 20m
Direct flights	None

The fastest flight from London Heathrow Airport to Region of Siem Reap takes 15h 20m

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 5 operators available for flights from London Heathrow Airport to Siem Reap as of April 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
Austrian Airlines	PriceFrom £535	Free Cancellation	Rating 7.6 911 reviews	Search Austrian Airlines flights
Lufthansa	PriceFrom £593	Free Cancellation	Rating 6.8 7,956 reviews	Search Lufthansa flights
Vietnam Airlines	PriceFrom £612	Free Cancellation	Rating 7.7 264 reviews	Search Vietnam Airlines flights
Singapore Airlines	PriceFrom £659	Free Cancellation	Rating 8.2 1,502 reviews	Search Singapore Airlines flights
Thai Airways	PriceFrom £855	Free Cancellation	Rating 7.9 401 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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Cheap flights from London Heathrow Airport to Siem Reap from £383

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Emirates flights from London Heathrow Airport to Region of Siem Reap

Our best Emirates 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?

How far in advance should I book a flight from London Heathrow Airport to 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

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

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

Explore popular destinations other users love

According to popular flight searches on momondo this year