Which airlines fly to Region of Siem Reap?

Vietnam Airlines, Singapore 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. Vietnam Airlines is the first choice among our users, with 36% of people opting to fly with this airline when travelling to Region of Siem Reap. Keep in mind that there are 4 different airlines that fly to Region of Siem Reap on a routine basis, so you have a few additional options to choose from.

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

There are 4 operators available for flights from London Heathrow Airport to Siem Reap as of September 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.

£327 Cheap Flights from London Heathrow Airport to Region of Siem Reap in 2026

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from London Heathrow Airport to Siem Reap

Return

One-way

Last minute

Cheap return flights

Enter your travel dates to find the best prices.

06:00 - 18:30LHR London Heathrow-SAI Siem Reap–Angkor Intl

29h 30m2 stops Vienna Intl Bangkok Suvarnabhumi

09:55 - 14:05SAI Siem Reap–Angkor Intl-LHR London Heathrow

35h 10m2 stops Bangkok Suvarnabhumi Vienna Intl

£609Austrian Airlines

Thu, 3 Dec - Mon, 14 Dec

06:00 - 18:30LHR London Heathrow-SAI Siem Reap–Angkor Intl

29h 30m2 stops Vienna Intl Bangkok Suvarnabhumi

19:25 - 08:20SAI Siem Reap–Angkor Intl-LHR London Heathrow

19h 55m2 stops Bangkok Suvarnabhumi Vienna Intl

£624Austrian Airlines

Thu, 3 Dec - Mon, 14 Dec

20:15 - 18:45LHR London Heathrow-SAI Siem Reap–Angkor Intl

39h 30m2 stops Munich Franz Josef Strauss Bangkok Suvarnabhumi

16:50 - 08:05SAI Siem Reap–Angkor Intl-LHR London Heathrow

22h 15m2 stops Singapore Changi Zurich

£633Multiple Airlines

Mon, 8 Feb - Wed, 10 Mar

22:10 - 18:05LHR London Heathrow-SAI Siem Reap–Angkor Intl

37h 55m2 stops Guangzhou Baiyun Hanoi Noibai

19:10 - 16:55SAI Siem Reap–Angkor Intl-LHR London Heathrow

27h 45m1 stop Ho Chi Minh City

£642Multiple Airlines

Wed, 23 Sep - Wed, 21 Oct

18:55 - 18:20LHR London Heathrow-SAI Siem Reap–Angkor Intl

17h 25m1 stop Ho Chi Minh City

22:35 - 16:55SAI Siem Reap–Angkor Intl-LHR London Heathrow

24h 20m1 stop Ho Chi Minh City

£717Vietnam Airlines

Thu, 1 Oct - Wed, 14 Oct

18:55 - 17:10LHR London Heathrow-SAI Siem Reap–Angkor Intl

16h 15m1 stop Hanoi Noibai

22:35 - 16:55SAI Siem Reap–Angkor Intl-LHR London Heathrow

24h 20m1 stop Ho Chi Minh City

£717Vietnam Airlines

Wed, 23 Sep - Wed, 21 Oct

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

17h 45m1 stop Singapore Changi

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

29h 30m1 stop Singapore Changi

£754Singapore Airlines

Tue, 10 Nov - Thu, 3 Dec

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

22h 20m1 stop Singapore Changi

10:45 - 19:10SAI Siem Reap–Angkor Intl-LHR London Heathrow

39h 25m1 stop Singapore Changi

£754Singapore Airlines

Wed, 27 Jan - Thu, 11 Feb

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

£1,014Thai Airways

Mon, 18 Jan - Sun, 31 Jan

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

£1,014Thai Airways

Mon, 18 Jan - Tue, 2 Feb

Cheap last-minute flights

Enter your travel dates to find the best prices.

21:20 - 20:10LHR London Heathrow-SAI Siem Reap–Angkor Intl

40h 50m3 stops Shanghai Pu Dong Hengyang Kunming Changshui

21:10 - 18:40SAI Siem Reap–Angkor Intl-LHR London Heathrow

27h 30m2 stops Kunming Changshui Shanghai Pu Dong

£616China Eastern

Wed, 16 Sep - Wed, 14 Oct

21:20 - 20:10LHR London Heathrow-SAI Siem Reap–Angkor Intl

40h 50m3 stops Shanghai Pu Dong Hengyang Kunming Changshui

21:10 - 18:40SAI Siem Reap–Angkor Intl-LHR London Heathrow

27h 30m2 stops Kunming Changshui Shanghai Pu Dong

£638China Eastern

Wed, 16 Sep - Wed, 14 Oct

22:00 - 18:05LHR London Heathrow-SAI Siem Reap–Angkor Intl

38h 05m2 stops Haikou Meilan Intl Hanoi Noibai

19:10 - 16:55SAI Siem Reap–Angkor Intl-LHR London Heathrow

27h 45m1 stop Ho Chi Minh City

£664Multiple Airlines

Wed, 16 Sep - Wed, 14 Oct

21:20 - 20:10LHR London Heathrow-SAI Siem Reap–Angkor Intl

40h 50m3 stops Shanghai Pu Dong Hengyang Kunming Changshui

21:10 - 18:40SAI Siem Reap–Angkor Intl-LHR London Heathrow

27h 30m2 stops Kunming Changshui Shanghai Pu Dong

£666China Eastern

Wed, 16 Sep - Wed, 14 Oct

09:05 - 18:55LHR London Heathrow-SAI Siem Reap–Angkor Intl

27h 50m2 stops Vienna Intl Bangkok Suvarnabhumi

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

39h 40m2 stops Bangkok Suvarnabhumi Zurich

£692Multiple Airlines

Wed, 16 Sep - Wed, 14 Oct

06:00 - 18:55LHR London Heathrow-SAI Siem Reap–Angkor Intl

30h 55m2 stops Vienna Intl Bangkok Suvarnabhumi

09:40 - 21:45SAI Siem Reap–Angkor Intl-LHR London Heathrow

18h 05m2 stops Bangkok Suvarnabhumi Zurich

£697Multiple Airlines

Wed, 16 Sep - Wed, 14 Oct

06:00 - 18:55LHR London Heathrow-SAI Siem Reap–Angkor Intl

30h 55m2 stops Vienna Intl Bangkok Suvarnabhumi

09:40 - 21:45SAI Siem Reap–Angkor Intl-LHR London Heathrow

18h 05m2 stops Bangkok Suvarnabhumi Zurich

£698Multiple Airlines

Wed, 16 Sep - Wed, 14 Oct

18:55 - 17:10LHR London Heathrow-SAI Siem Reap–Angkor Intl

16h 15m1 stop Hanoi Noibai

22:35 - 16:55SAI Siem Reap–Angkor Intl-LHR London Heathrow

24h 20m1 stop Ho Chi Minh City

£717Vietnam Airlines

Wed, 16 Sep - Wed, 14 Oct

18:55 - 17:10LHR London Heathrow-SAI Siem Reap–Angkor Intl

16h 15m1 stop Hanoi Noibai

22:35 - 16:55SAI Siem Reap–Angkor Intl-LHR London Heathrow

24h 20m1 stop Ho Chi Minh City

£717Vietnam Airlines

Wed, 16 Sep - Wed, 14 Oct

18:55 - 17:10LHR London Heathrow-SAI Siem Reap–Angkor Intl

16h 15m1 stop Hanoi Noibai

22:35 - 16:55SAI Siem Reap–Angkor Intl-LHR London Heathrow

24h 20m1 stop Ho Chi Minh City

£718Vietnam Airlines

Wed, 16 Sep - Wed, 14 Oct

Save money when you book flights with momondo

Big names, great deals

Search 100s of travel sites to compare prices.

Filter for what you want

Free Wi-Fi? Stopover? Instantly customise your results.

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Not ready to book? to track prices.

Search flight deals

SWISS flights from London Heathrow Airport to Region of Siem Reap

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

SWISS

25 Jan

LHR18:40London Heathrow

32h 15m

2 stops

SAI09:55Siem Reap–Angkor Intl

22 Feb

SAI16:50Siem Reap–Angkor Intl

22h 15m

2 stops

LHR08:05London Heathrow

£673

SWISS

22 Sept

LHR08:45London Heathrow

28h 10m

2 stops

SAI18:55Siem Reap–Angkor Intl

21 Oct

SAI09:40Siem Reap–Angkor Intl

18h 05m

2 stops

LHR21:45London Heathrow

£713

SWISS

23 Sept

LHR08:40London Heathrow

28h 15m

2 stops

SAI18:55Siem Reap–Angkor Intl

20 Oct

SAI10:30Siem Reap–Angkor Intl

27h 25m

2 stops

LHR07:55London Heathrow

£746

Lufthansa flights from London Heathrow Airport to Region of Siem Reap

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

Lufthansa

10 Nov

LHR08:30London Heathrow

42h 25m

2 stops

SAI09:55Siem Reap–Angkor Intl

5 Dec

SAI16:50Siem Reap–Angkor Intl

24h 55m

2 stops

LHR10:45London Heathrow

£660

Lufthansa

10 Nov

LHR07:40London Heathrow

19h 15m

2 stops

SAI09:55Siem Reap–Angkor Intl

18 Nov

SAI19:25Siem Reap–Angkor Intl

19h 40m

2 stops

LHR08:05London Heathrow

£678

Lufthansa

13 Nov

LHR13:30London Heathrow

37h 25m

2 stops

SAI09:55Siem Reap–Angkor Intl

20 Nov

SAI16:50Siem Reap–Angkor Intl

32h 55m

2 stops

LHR18:45London Heathrow

£720

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

Thu 3/12

06:00-18:30

2 stops29h 30m

Siem Reap–Angkor Intl

Mon 14/12

09:55-14:05

2 stops35h 10m

£609

LondonSiem Reap

LHR London Heathrow - SAI Siem Reap–Angkor Intl

LHRSAI

London Heathrow

Thu 3/12

06:00-18:30

2 stops29h 30m

Siem Reap–Angkor Intl

Mon 14/12

19:25-08:20

2 stops19h 55m

£624

LondonSiem Reap

LHR London Heathrow - SAI Siem Reap–Angkor Intl

LHRSAI

London Heathrow

Mon 8/2

20:15-18:45

2 stops39h 30m

Siem Reap–Angkor Intl

Wed 10/3

16:50-08:05

2 stops22h 15m

£633

LondonSiem Reap

LHR London Heathrow - SAI Siem Reap–Angkor Intl

LHRSAI

London Heathrow

Wed 23/9

22:10-18:05

2 stops37h 55m

Siem Reap–Angkor Intl

Wed 21/10

19:10-16:55

1 stop27h 45m

£642

LondonSiem Reap

LHR London Heathrow - SAI Siem Reap–Angkor Intl

LHRSAI

London Heathrow

Thu 1/10

18:55-18:20

1 stop17h 25m

Siem Reap–Angkor Intl

Wed 14/10

22:35-16:55

1 stop24h 20m

£717

LondonSiem Reap

LHR London Heathrow - SAI Siem Reap–Angkor Intl

LHRSAI

London Heathrow

Wed 23/9

18:55-17:10

1 stop16h 15m

Siem Reap–Angkor Intl

Wed 21/10

22:35-16:55

1 stop24h 20m

£717

LondonSiem Reap

LHR London Heathrow - SAI Siem Reap–Angkor Intl

LHRSAI

London Heathrow

Tue 10/11

09:10-09:55

1 stop17h 45m

Siem Reap–Angkor Intl

Thu 3/12

16:50-15:20

1 stop29h 30m

£754

LondonSiem Reap

LHR London Heathrow - SAI Siem Reap–Angkor Intl

LHRSAI

London Heathrow

Wed 27/1

10:40-16:00

1 stop22h 20m

Siem Reap–Angkor Intl

Thu 11/2

10:45-19:10

1 stop39h 25m

£754

Fastest return journey

LondonSiem Reap

LHR London Heathrow - SAI Siem Reap–Angkor Intl

LHRSAI

London Heathrow

Mon 18/1

11:50-08:45

1 stop13h 55m

Siem Reap–Angkor Intl

Sun 31/1

09:50-19:35

1 stop16h 45m

£1,014

LondonSiem Reap

LHR London Heathrow - SAI Siem Reap–Angkor Intl

LHRSAI

London Heathrow

Mon 18/1

11:50-08:45

1 stop13h 55m

Siem Reap–Angkor Intl

Tue 2/2

09:50-19:35

1 stop16h 45m

£1,014

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 £689.

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

Best price found	£327
Fastest flight time	16h 20m
Direct flights	None

The best one-way flight to Region of Siem Reap from London Heathrow Airport in the past 72 hours is £327. The best return flight deal from London Heathrow Airport to Region of Siem Reap found on momondo in the last 72 hours is £609.

The fastest flight from London Heathrow Airport to Region of Siem Reap takes 16h 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 4 operators available for flights from London Heathrow Airport to Siem Reap as of September 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 7.6 959 reviews	Search Austrian Airlines flights
Vietnam Airlines	PriceFrom £612	Free Cancellation	Rating 7.7 286 reviews	Search Vietnam Airlines flights
Singapore Airlines	PriceFrom £659	Free Cancellation	Rating 8.2 1,600 reviews	Search Singapore Airlines flights
Thai Airways	PriceFrom £883	Free Cancellation	Rating 7.9 418 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.

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.

Start using Trips

Find my bookings

Get notified when prices go down

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

1 adult

Sun 11/10

Sun 18/10

Email me momondo's favourite deals

By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to Siem Reap

Popular cities

Other flights from London Heathrow Airport

Other flights to Siem Reap

Airlines

Cabin classes

Complete your trip

Feeling lucky

Popular Cities in Siem Reap

Flights to Phnom Penh

Flights to Siem Reapfrom £630

Cheap flights from London Heathrow Airport to Siem Reap from £327

Find the cheapest flights from London Heathrow Airport to Siem Reap

Cheap return flights

Cheap one-way flights

Cheap last-minute flights

Big names, great deals

Big names, great deals

Filter for what you want

Filter for what you want

Trusted and free

Trusted and free

Price Alerts

Price Alerts

SWISS flights from London Heathrow Airport to Region of Siem Reap

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

Lufthansa flights from London Heathrow Airport to Region of Siem Reap

Our best Lufthansa 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?

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

Explore popular destinations other users love

According to popular flight searches on momondo this year