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

Flights via Singapore (SIN) offer the lowest average return price of £803.

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

Singapore (SIN) was the most common stop: 77% of momondo users choosing one-stop flights on this route connected there.

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.

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

Etihad Airways, Austrian Airlines, and China Eastern are the most popular carriers operating from London Heathrow to Siem Reap–Angkor Intl

Which airlines fly to Siem Reap?

Singapore Airlines, Vietnam Airlines and Thai Airways are the top three most popular airlines that fly to Siem Reap from London Heathrow Airport according to our data. Singapore Airlines is the first choice among our users, with 40% of people opting to fly with this airline when travelling to Siem Reap. Keep in mind that there are 5 different airlines that fly to Siem Reap on a routine basis, so you have a few additional options to choose from.

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 June 2026, there are 5 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.

£181 Cheap Flights from London Heathrow Airport to Siem Reap in 2026

Q: 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 £842 to £739. The lowest price recently found on this route was £216.

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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.

21:45 - 15:55

LHR

SAI

35h 10m

1 stop

10:45 - 05:55

SAI

LHR

26h 10m

1 stop

£216Singapore Airlines

Tue, 10 Nov - Thu, 3 Dec

21:45 - 17:50

LHR

SAI

38h 05m

2 stops

19:20 - 07:00

SAI

LHR

41h 40m

2 stops

£575Etihad Airways

Mon, 22 Jun - Tue, 7 Jul

21:45 - 17:50

LHR

SAI

38h 05m

2 stops

15:10 - 07:00

SAI

LHR

45h 50m

2 stops

£589Etihad Airways

Fri, 26 Jun - Fri, 3 Jul

12:20 - 18:55

LHR

SAI

24h 35m

2 stops

09:40 - 21:45

SAI

LHR

18h 05m

2 stops

£595Multiple Airlines

Tue, 15 Sep - Wed, 23 Sep

18:40 - 09:40

LHR

SAI

33h 00m

2 stops

09:40 - 21:45

SAI

LHR

18h 05m

2 stops

£605SWISS

Mon, 14 Sep - Tue, 22 Sep

14:45 - 11:15

LHR

SAI

38h 30m

2 stops

15:10 - 07:00

SAI

LHR

21h 50m

2 stops

£607Etihad Airways

Wed, 15 Jul - Sat, 25 Jul

06:00 - 18:55

LHR

SAI

30h 55m

2 stops

12:55 - 08:20

SAI

LHR

25h 25m

2 stops

£614Austrian Airlines

Fri, 25 Sep - Tue, 29 Sep

13:50 - 18:55

LHR

SAI

23h 05m

2 stops

09:40 - 21:45

SAI

LHR

18h 05m

2 stops

£616SWISS

Tue, 8 Sep - Sat, 26 Sep

09:30 - 11:15

LHR

SAI

19h 45m

2 stops

15:10 - 18:45

SAI

LHR

33h 35m

2 stops

£617Etihad Airways

Fri, 3 Jul - Fri, 10 Jul

14:45 - 14:20

LHR

SAI

41h 35m

2 stops

15:10 - 07:00

SAI

LHR

21h 50m

2 stops

£619Etihad Airways

Sat, 4 Jul - Sat, 11 Jul

Etihad Airways flights from London Heathrow Airport to Siem Reap

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

Etihad Airways

22 Jun

LHR21:45London Heathrow

38h 05m

2 stops

SAI17:50Siem Reap–Angkor Intl

7 Jul

SAI19:20Siem Reap–Angkor Intl

41h 40m

2 stops

LHR07:00London Heathrow

£575

Etihad Airways

10 Jun

LHR21:45London Heathrow

31h 30m

2 stops

SAI11:15Siem Reap–Angkor Intl

16 Jun

SAI19:20Siem Reap–Angkor Intl

29h 25m

2 stops

LHR18:45London Heathrow

£588

Etihad Airways

26 Jun

LHR21:45London Heathrow

38h 05m

2 stops

SAI17:50Siem Reap–Angkor Intl

3 Jul

SAI15:10Siem Reap–Angkor Intl

45h 50m

2 stops

LHR07:00London Heathrow

£589

China Eastern flights from London Heathrow Airport to Siem Reap

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

China Eastern

10 Nov

LHR21:00London Heathrow

41h 00m

2 stops

SAI21:00Siem Reap–Angkor Intl

3 Dec

SAI22:00Siem Reap–Angkor Intl

50h 30m

2 stops

LHR17:30London Heathrow

£699

China Eastern

10 Nov

LHR21:00London Heathrow

41h 00m

2 stops

SAI21:00Siem Reap–Angkor Intl

5 Dec

SAI22:00Siem Reap–Angkor Intl

50h 30m

3 stops

LHR17:30London Heathrow

£700

China Eastern

15 Nov

LHR21:00London Heathrow

41h 00m

3 stops

SAI21:00Siem Reap–Angkor Intl

3 Dec

SAI22:00Siem Reap–Angkor Intl

50h 30m

3 stops

LHR17:30London Heathrow

£701

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

Tue 10/11

21:45-15:55

1 stop35h 10m

Siem Reap–Angkor Intl

Thu 3/12

10:45-05:55

1 stop26h 10m

£216

LondonSiem Reap

LHR - SAI

LHRSAI

London Heathrow

Mon 22/6

21:45-17:50

2 stops38h 05m

Siem Reap–Angkor Intl

Tue 7/7

19:20-07:00

2 stops41h 40m

£575

LondonSiem Reap

LHR - SAI

LHRSAI

London Heathrow

Fri 26/6

21:45-17:50

2 stops38h 05m

Siem Reap–Angkor Intl

Fri 3/7

15:10-07:00

2 stops45h 50m

£589

LondonSiem Reap

LHR - SAI

LHRSAI

London Heathrow

Tue 15/9

12:20-18:55

2 stops24h 35m

Siem Reap–Angkor Intl

Wed 23/9

09:40-21:45

2 stops18h 05m

£595

LondonSiem Reap

LHR - SAI

LHRSAI

London Heathrow

Mon 14/9

18:40-09:40

2 stops33h 00m

Siem Reap–Angkor Intl

Tue 22/9

09:40-21:45

2 stops18h 05m

£605

LondonSiem Reap

LHR - SAI

LHRSAI

London Heathrow

Wed 15/7

14:45-11:15

2 stops38h 30m

Siem Reap–Angkor Intl

Sat 25/7

15:10-07:00

2 stops21h 50m

£607

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

£614

Fastest return journey

LondonSiem Reap

LHR - SAI

LHRSAI

London Heathrow

Tue 8/9

13:50-18:55

2 stops23h 05m

Siem Reap–Angkor Intl

Sat 26/9

09:40-21:45

2 stops18h 05m

£616

LondonSiem Reap

LHR - SAI

LHRSAI

London Heathrow

Fri 3/7

09:30-11:15

2 stops19h 45m

Siem Reap–Angkor Intl

Fri 10/7

15:10-18:45

2 stops33h 35m

£617

LondonSiem Reap

LHR - SAI

LHRSAI

London Heathrow

Sat 4/7

14:45-14:20

2 stops41h 35m

Siem Reap–Angkor Intl

Sat 11/7

15:10-07:00

2 stops21h 50m

£619

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?

What is the cheapest month to fly to Siem Reap?

The month of September is, on average, the cheapest month to fly to Siem Reap from London Heathrow Airport, with most prices found around £717. If you don’t want to visit Siem Reap in September, then you should wait until November to fly from London Heathrow Airport, when ticket prices are also cheap, with an average price of £760.

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

You could potentially save up to 19% 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

Fastest flight time	24h 35m
Direct flights	None

The fastest flight from London Heathrow Airport to Siem Reap takes 24h 35m

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 24h 35m.
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 June 2026, there are 5 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 Singapore Airlines (37% of total bookings). The next most popular airlines are Vietnam Airlines (34%), Thai Airways (11%), and Austrian Airlines (10%).

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 £541	Free Cancellation	Rating 7.6 923 reviews	Search Austrian Airlines flights
Lufthansa	PriceFrom £599	Free Cancellation	Rating 6.8 8,036 reviews	Search Lufthansa flights
Vietnam Airlines	PriceFrom £621	Free Cancellation	Rating 7.7 271 reviews	Search Vietnam Airlines flights
Singapore Airlines	PriceFrom £666	Free Cancellation	Rating 8.2 1,532 reviews	Search Singapore Airlines flights
Thai Airways	PriceFrom £872	Free Cancellation	Rating 7.9 404 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

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.

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Cheap flights from London Heathrow Airport to Siem Reap from £181

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Etihad Airways flights from London Heathrow Airport to Siem Reap

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

China Eastern flights from London Heathrow Airport to Siem Reap

Our best China Eastern 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?

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

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

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

Fly to other destinations from London Heathrow Airport

According to popular flight searches on momondo this year

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