Which stopover airport has the shortest connection time from London Heathrow Airport to Siem Reap?

Bangkok (BKK) has the shortest average stopover time for this route: 1h 58m.

Which airlines fly to Siem Reap?

Vietnam Airlines, Singapore Airlines and Thai Airways are the top three most popular airlines that fly to 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 Siem Reap. Keep in mind that there are 4 different airlines that fly to Siem Reap on a routine basis, so you have a few additional options to choose from.

Which stopover airport offers the lowest fares from London Heathrow Airport to Siem Reap?

Flights via Singapore (SIN) offer the lowest average return price of £805.

Which stopover airport has the shortest travel time from London Heathrow Airport to Siem Reap?

Flights connecting via Bangkok (BKK) have the shortest average one-way travel time: 13h 55m.

Which airport is the most popular for stopovers for flights between London Heathrow Airport and Siem Reap?

Singapore (SIN) was the most common stop: 53% of momondo users choosing one-stop flights on this route connected there.

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

Prices for flights from London Heathrow Airport to Siem Reap–Angkor Intl Airport were last updated today.

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

As of September 2026, there are 4 operators available to choose from for flights from London Heathrow Airport to Siem Reap–Angkor Intl Airport.

How old do you have to be to fly from London Heathrow Airport to Siem Reap–Angkor Intl 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 London Heathrow Airport to Siem Reap–Angkor Intl Airport.

What documentation or ID do you need to fly to Siem Reap–Angkor Intl Airport?

The travel and health documents required for your trip to Siem Reap–Angkor Intl Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Siem Reap–Angkor Intl Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

£366 Cheap Flights from London Heathrow Airport to Siem Reap in 2026/27

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from London Heathrow Airport to Siem Reap

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

18h 45m2 stops Bangkok Suvarnabhumi Zurich

£632Multiple 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

09:55 - 21:40SAI Siem Reap–Angkor Intl-LHR London Heathrow

18h 45m2 stops Bangkok Suvarnabhumi Zurich

£633Multiple Airlines

Thu, 3 Dec - Mon, 14 Dec

09:05 - 18:45LHR London Heathrow-SAI Siem Reap–Angkor Intl

26h 40m2 stops Vienna Intl Bangkok Suvarnabhumi

09:55 - 21:40SAI Siem Reap–Angkor Intl-LHR London Heathrow

18h 45m2 stops Bangkok Suvarnabhumi Vienna Intl

£636Austrian Airlines

Sun, 17 Jan - Sun, 24 Jan

19:25 - 18:45LHR London Heathrow-SAI Siem Reap–Angkor Intl

16h 20m2 stops Vienna Intl Bangkok Suvarnabhumi

09:55 - 21:40SAI Siem Reap–Angkor Intl-LHR London Heathrow

18h 45m2 stops Bangkok Suvarnabhumi Vienna Intl

£638Austrian Airlines

Sat, 23 Jan - Sat, 6 Feb

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, 30 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

£718Vietnam Airlines

Thu, 1 Oct - Wed, 14 Oct

21:45 - 16:00LHR London Heathrow-SAI Siem Reap–Angkor Intl

35h 15m1 stop Singapore Changi

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

39h 25m1 stop Singapore Changi

£760Singapore Airlines

Sat, 7 Nov - Sat, 23 Jan

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

22h 20m1 stop Singapore Changi

16:50 - 19:10SAI Siem Reap–Angkor Intl-LHR London Heathrow

33h 20m1 stop Singapore Changi

£762Singapore Airlines

Tue, 10 Nov - Thu, 26 Nov

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

£1,047Thai Airways

Sun, 13 Dec - Sun, 3 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

£1,061Thai Airways

Sun, 1 Nov - Sun, 17 Jan

Cheap last-minute flights

Enter your travel dates to find the best prices.

12:35 - 15:15LHR London Heathrow-SAI Siem Reap–Angkor Intl

20h 40m2 stops Xiamen Gaoqi Intl Phnom Penh Techo Intl

19:05 - 19:20SAI Siem Reap–Angkor Intl-LHR London Heathrow

30h 15m2 stops Hanoi Noibai Guangzhou Baiyun

£624Multiple Airlines

Wed, 23 Sep - Wed, 21 Oct

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

£649Multiple Airlines

Wed, 23 Sep - Wed, 21 Oct

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

£677Multiple Airlines

Wed, 23 Sep - Wed, 30 Sep

06:40 - 13:15LHR London Heathrow-SAI Siem Reap–Angkor Intl

24h 35m2 stops Kastrup Copenhagen Ho Chi Minh City

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

35h 40m2 stops Bangkok Suvarnabhumi Manama Bahrain Intl

£689Multiple Airlines

Thu, 24 Sep - Wed, 7 Oct

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

30h 55m2 stops Vienna Intl Bangkok Suvarnabhumi

09:40 - 16:25SAI Siem Reap–Angkor Intl-LHR London Heathrow

36h 45m2 stops Bangkok Suvarnabhumi Zurich

£689Multiple Airlines

Wed, 23 Sep - Wed, 21 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, 23 Sep - Wed, 21 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

£722Vietnam 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

£722Vietnam Airlines

Thu, 24 Sep - Wed, 7 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

£724Vietnam Airlines

Wed, 23 Sep - Wed, 21 Oct

22:05 - 09:40LHR London Heathrow-SAI Siem Reap–Angkor Intl

29h 35m1 stop Singapore Changi

16:00 - 05:55SAI Siem Reap–Angkor Intl-LHR London Heathrow

19h 55m1 stop Singapore Changi

£1,562Singapore Airlines

Sat, 19 Sep - Fri, 2 Oct

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Vietnam Airlines flights from London Heathrow Airport to Siem Reap

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

Vietnam Airlines

23 Sept

LHR18:55London Heathrow

16h 15m

1 stop

SAI17:10Siem Reap–Angkor Intl

21 Oct

SAI22:35Siem Reap–Angkor Intl

24h 20m

1 stop

LHR16:55London Heathrow

£718

Vietnam Airlines

23 Sept

LHR18:55London Heathrow

16h 15m

1 stop

SAI17:10Siem Reap–Angkor Intl

21 Oct

SAI22:35Siem Reap–Angkor Intl

24h 20m

1 stop

LHR16:55London Heathrow

£722

Vietnam Airlines

23 Sept

LHR18:55London Heathrow

16h 15m

1 stop

SAI17:10Siem Reap–Angkor Intl

21 Oct

SAI22:35Siem Reap–Angkor Intl

24h 20m

1 stop

LHR16:55London Heathrow

£724

Emirates flights from London Heathrow Airport to Siem Reap

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

Emirates

27 Sept

LHR22:15London Heathrow

41h 15m

2 stops

SAI21:30Siem Reap–Angkor Intl

27 Oct

SAI23:50Siem Reap–Angkor Intl

38h 20m

2 stops

LHR07:10London Heathrow

£761

Emirates

27 Sept

LHR19:40London Heathrow

43h 50m

2 stops

SAI21:30Siem Reap–Angkor Intl

20 Oct

SAI23:50Siem Reap–Angkor Intl

24h 50m

2 stops

LHR18:40London Heathrow

£766

Emirates

20 Sept

LHR16:50London Heathrow

46h 40m

2 stops

SAI21:30Siem Reap–Angkor Intl

29 Sept

SAI23:50Siem Reap–Angkor Intl

26h 25m

2 stops

LHR20:15London Heathrow

£768

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

09:55-21:40

2 stops18h 45m

£632

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

09:55-21:40

2 stops18h 45m

£633

LondonSiem Reap

LHR London Heathrow - SAI Siem Reap–Angkor Intl

LHRSAI

London Heathrow

Sun 17/1

09:05-18:45

2 stops26h 40m

Siem Reap–Angkor Intl

Sun 24/1

09:55-21:40

2 stops18h 45m

£636

LondonSiem Reap

LHR London Heathrow - SAI Siem Reap–Angkor Intl

LHRSAI

London Heathrow

Sat 23/1

19:25-18:45

2 stops16h 20m

Siem Reap–Angkor Intl

Sat 6/2

09:55-21:40

2 stops18h 45m

£638

LondonSiem Reap

LHR London Heathrow - SAI Siem Reap–Angkor Intl

LHRSAI

London Heathrow

Wed 30/9

18:55-17:10

1 stop16h 15m

Siem Reap–Angkor Intl

Wed 21/10

22:35-16:55

1 stop24h 20m

£718

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

£718

LondonSiem Reap

LHR London Heathrow - SAI Siem Reap–Angkor Intl

LHRSAI

London Heathrow

Sat 7/11

21:45-16:00

1 stop35h 15m

Siem Reap–Angkor Intl

Sat 23/1

10:45-19:10

1 stop39h 25m

£760

LondonSiem Reap

LHR London Heathrow - SAI Siem Reap–Angkor Intl

LHRSAI

London Heathrow

Tue 10/11

10:40-16:00

1 stop22h 20m

Siem Reap–Angkor Intl

Thu 26/11

16:50-19:10

1 stop33h 20m

£762

Fastest return journey

LondonSiem Reap

LHR London Heathrow - SAI Siem Reap–Angkor Intl

LHRSAI

London Heathrow

Sun 13/12

11:50-08:45

1 stop13h 55m

Siem Reap–Angkor Intl

Sun 3/1

09:50-19:35

1 stop16h 45m

£1,047

LondonSiem Reap

LHR London Heathrow - SAI Siem Reap–Angkor Intl

LHRSAI

London Heathrow

Sun 1/11

11:50-08:45

1 stop13h 55m

Siem Reap–Angkor Intl

Sun 17/1

09:50-19:35

1 stop16h 45m

£1,061

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 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

Stopovers

What is the typical price of a round-trip flight between London Heathrow Airport and Siem Reap?

Prices are currently low for flights on this route.

Typical prices usually range from £638 to £799.
The lowest price recently found on this route was £624.

What is the cheapest month to fly to Siem Reap?

The month of March is, on average, the cheapest month to fly to Siem Reap from London Heathrow Airport, with most prices found around £692. If you don’t want to visit Siem Reap in March, then you should wait until September to fly from London Heathrow Airport, when ticket prices are also cheap, with an average price of £697.

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

You could potentially save up to 14% on your flight if you consider stops on a London Heathrow Airport to Siem Reap flight.

When to book flights from London Heathrow Airport to Siem Reap

Are you open to changing your travel dates? Check out the ideal times to fly from London Heathrow Airport to Siem Reap according to our flight data. Find out which month and days have the cheapest flights.

Estimated return price

Cheap London Heathrow Airport to Siem Reap (LHR to SAI) flight deals and tips

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

Best price found	£366
Fastest flight time	14h 25m
Direct flights	None

The best one-way flight to Siem Reap from London Heathrow Airport in the past 72 hours is £366. The best return flight deal from London Heathrow Airport to Siem Reap found on momondo in the last 72 hours is £632.

The fastest flight from London Heathrow Airport to Siem Reap takes 14h 25m

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

Search flight deals

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

How far is London Heathrow to Siem Reap–Angkor Intl by plane?
A flight from London Heathrow to Siem Reap–Angkor Intl will travel around 6091.7 mi. In terms of flight time, this usually takes a little over 14h 25m.
When did momondo last update prices for flights from London Heathrow Airport to Siem Reap–Angkor Intl Airport?
Prices for flights from London Heathrow Airport to Siem Reap–Angkor Intl Airport were last updated today.
How many operators does momondo search for flights from London Heathrow Airport to Siem Reap–Angkor Intl Airport?
As of September 2026, there are 4 operators available to choose from for flights from London Heathrow Airport to Siem Reap–Angkor Intl Airport.
How old do you have to be to fly from London Heathrow Airport to Siem Reap–Angkor Intl 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 London Heathrow Airport to Siem Reap–Angkor Intl Airport.
What documentation or ID do you need to fly to Siem Reap–Angkor Intl Airport?
The travel and health documents required for your trip to Siem Reap–Angkor Intl Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Siem Reap–Angkor Intl Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.
What is the most popular airline from London Heathrow Airport to Siem Reap?
Based on momondo bookings for this flight route, the most popular airline on flight routes from London Heathrow Airport to Siem Reap is Vietnam Airlines (36% of total bookings). The next most popular airlines are Singapore Airlines (32%), Thai Airways (17%), and Austrian Airlines (15%).

Best airlines flying from London Heathrow Airport to Siem Reap

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

Airline	Rating	Free Cancellation	Price
Austrian Airlines	PriceFrom £542	Free Cancellation	Rating 7.6 964 reviews	Search Austrian Airlines flights
Vietnam Airlines	PriceFrom £620	Free Cancellation	Rating 7.7 288 reviews	Search Vietnam Airlines flights
Singapore Airlines	PriceFrom £667	Free Cancellation	Rating 8.2 1,605 reviews	Search Singapore Airlines flights
Thai Airways	PriceFrom £913	Free Cancellation	Rating 7.9 420 reviews	Search Thai Airways flights

Why use momondo?

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

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from London to Siem Reap. momondo saves you time and could save you money on your trip.

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

Flights from London to Siem Reap with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

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

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Siem Reap from London.

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

Price alerts on flights to Siem Reap from London 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.

An easier way to manage your Siem Reap trip

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Vietnam Airlines flights from London Heathrow Airport to Siem Reap

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

Emirates flights from London Heathrow Airport to Siem Reap

Our best Emirates deals on London Heathrow Airport to 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 Siem Reap

What is the typical price of a round-trip flight between London Heathrow Airport and Siem Reap?

What is the cheapest month to fly to Siem Reap?

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

Which airlines fly to Siem Reap?

Which airport is the most popular for stopovers for flights between London Heathrow Airport and Siem Reap?

Which stopover airport offers the lowest fares from London Heathrow Airport to Siem Reap?

Which stopover airport has the shortest travel time from London Heathrow Airport to Siem Reap?

Which stopover airport has the shortest connection time from London Heathrow Airport to Siem Reap?

When to book flights from London Heathrow Airport to Siem Reap

Cheap London Heathrow Airport to Siem Reap (LHR to SAI) 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 Siem Reap

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

Why use momondo?

An easier way to manage your 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 Cambodia

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.

Popular Cities in Cambodia

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

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According to popular flight searches on momondo this year

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