Which airlines fly to Siem Reap?

Vietnam Airlines, Singapore Airlines and Austrian Airlines 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 35% 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 airport is the most popular for stopovers for flights between London Heathrow Airport and Siem Reap?

Singapore (SIN) was the most common stop: 56% of momondo users choosing one-stop flights on this route connected there.

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

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

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 £807.

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.

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 July 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.

£351 Cheap Flights from London Heathrow Airport to 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.

12:10 - 18:55

LHR

SAI

24h 45m

2 stops

19:35 - 08:15

SAI

LHR

18h 40m

2 stops

£593Multiple Airlines

Wed, 2 Sep - Wed, 30 Sep

08:40 - 18:55

LHR

SAI

28h 15m

2 stops

09:40 - 07:55

SAI

LHR

28h 15m

2 stops

£599SWISS

Mon, 14 Sep - Sun, 27 Sep

06:00 - 18:55

LHR

SAI

30h 55m

2 stops

19:35 - 08:20

SAI

LHR

18h 45m

2 stops

£638Austrian Airlines

Wed, 30 Sep - Wed, 21 Oct

06:00 - 18:45

LHR

SAI

29h 45m

2 stops

09:55 - 21:40

SAI

LHR

18h 45m

2 stops

£677Austrian Airlines

Thu, 3 Dec - Mon, 14 Dec

10:40 - 09:50

LHR

SAI

16h 10m

1 stop

16:45 - 07:40

SAI

LHR

21h 55m

1 stop

£755Singapore Airlines

Mon, 23 Nov - Wed, 2 Dec

10:40 - 09:50

LHR

SAI

16h 10m

1 stop

16:45 - 07:40

SAI

LHR

21h 55m

1 stop

£755Singapore Airlines

Tue, 17 Nov - Wed, 2 Dec

18:55 - 17:10

LHR

SAI

16h 15m

1 stop

18:05 - 17:50

SAI

LHR

29h 45m

1 stop

£790Vietnam Airlines

Wed, 2 Sep - Sat, 3 Oct

11:00 - 16:55

LHR

SAI

22h 55m

1 stop

17:55 - 07:15

SAI

LHR

20h 20m

1 stop

£792Vietnam Airlines

Wed, 25 Nov - Sun, 6 Dec

11:50 - 08:45

LHR

SAI

13h 55m

1 stop

09:50 - 19:35

SAI

LHR

16h 45m

1 stop

£958Thai Airways

Fri, 6 Nov - Fri, 20 Nov

11:50 - 08:45

LHR

SAI

13h 55m

1 stop

09:50 - 19:35

SAI

LHR

16h 45m

1 stop

£1,012Thai Airways

Fri, 6 Nov - Sun, 22 Nov

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

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

22 Nov

LHR21:00London Heathrow

41h 00m

2 stops

SAI21:00Siem Reap–Angkor Intl

1 Dec

SAI22:00Siem Reap–Angkor Intl

50h 30m

2 stops

LHR17:30London Heathrow

£701

China Eastern

22 Nov

LHR21:00London Heathrow

41h 00m

2 stops

SAI21:00Siem Reap–Angkor Intl

1 Dec

SAI22:00Siem Reap–Angkor Intl

50h 30m

2 stops

LHR17:30London Heathrow

£701

China Eastern

5 Aug

LHR21:20London Heathrow

40h 50m

2 stops

SAI20:10Siem Reap–Angkor Intl

12 Aug

SAI21:10Siem Reap–Angkor Intl

27h 30m

2 stops

LHR18:40London Heathrow

£1,067

SWISS flights from London Heathrow Airport to Siem Reap

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

SWISS

14 Sept

LHR08:40London Heathrow

28h 15m

2 stops

SAI18:55Siem Reap–Angkor Intl

27 Sept

SAI09:40Siem Reap–Angkor Intl

28h 15m

2 stops

LHR07:55London Heathrow

£599

SWISS

14 Sept

LHR08:40London Heathrow

28h 15m

2 stops

SAI18:55Siem Reap–Angkor Intl

27 Sept

SAI09:40Siem Reap–Angkor Intl

28h 15m

2 stops

LHR07:55London Heathrow

£599

SWISS

2 Sept

LHR12:10London Heathrow

24h 45m

2 stops

SAI18:55Siem Reap–Angkor Intl

1 Oct

SAI09:40Siem Reap–Angkor Intl

28h 15m

2 stops

LHR07:55London Heathrow

£614

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

Wed 2/9

12:10-18:55

2 stops24h 45m

Siem Reap–Angkor Intl

Wed 30/9

19:35-08:15

2 stops18h 40m

£593

LondonSiem Reap

LHR - SAI

LHRSAI

London Heathrow

Mon 14/9

08:40-18:55

2 stops28h 15m

Siem Reap–Angkor Intl

Sun 27/9

09:40-07:55

2 stops28h 15m

£599

LondonSiem Reap

LHR - SAI

LHRSAI

London Heathrow

Wed 30/9

06:00-18:55

2 stops30h 55m

Siem Reap–Angkor Intl

Wed 21/10

19:35-08:20

2 stops18h 45m

£638

LondonSiem Reap

LHR - SAI

LHRSAI

London Heathrow

Thu 3/12

06:00-18:45

2 stops29h 45m

Siem Reap–Angkor Intl

Mon 14/12

09:55-21:40

2 stops18h 45m

£677

LondonSiem Reap

LHR - SAI

LHRSAI

London Heathrow

Mon 23/11

10:40-09:50

1 stop16h 10m

Siem Reap–Angkor Intl

Wed 2/12

16:45-07:40

1 stop21h 55m

£755

LondonSiem Reap

LHR - SAI

LHRSAI

London Heathrow

Tue 17/11

10:40-09:50

1 stop16h 10m

Siem Reap–Angkor Intl

Wed 2/12

16:45-07:40

1 stop21h 55m

£755

LondonSiem Reap

LHR - SAI

LHRSAI

London Heathrow

Wed 2/9

18:55-17:10

1 stop16h 15m

Siem Reap–Angkor Intl

Sat 3/10

18:05-17:50

1 stop29h 45m

£790

LondonSiem Reap

LHR - SAI

LHRSAI

London Heathrow

Wed 25/11

11:00-16:55

1 stop22h 55m

Siem Reap–Angkor Intl

Sun 6/12

17:55-07:15

1 stop20h 20m

£792

Fastest return journey

LondonSiem Reap

LHR - SAI

LHRSAI

London Heathrow

Fri 6/11

11:50-08:45

1 stop13h 55m

Siem Reap–Angkor Intl

Fri 20/11

09:50-19:35

1 stop16h 45m

£958

LondonSiem Reap

LHR - SAI

LHRSAI

London Heathrow

Fri 6/11

11:50-08:45

1 stop13h 55m

Siem Reap–Angkor Intl

Sun 22/11

09:50-19:35

1 stop16h 45m

£1,012

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 cheapest month to fly to Siem Reap?

The month of August is, on average, the cheapest month to fly to Siem Reap from London Heathrow Airport, with most prices found around £0. If you don’t want to visit Siem Reap in August, then you should wait until March to fly from London Heathrow Airport, when ticket prices are also cheap, with an average price of £695.

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

You could potentially save up to 8% 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	16h 15m
Direct flights	None

The fastest flight from London Heathrow Airport to Siem Reap takes 16h 15m

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 16h 15m.
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 July 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 (35% of total bookings). The next most popular airlines are Singapore Airlines (34%), Austrian Airlines (15%), and Thai Airways (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 £543	Free Cancellation	Rating 7.6 949 reviews	Search Austrian Airlines flights
Vietnam Airlines	PriceFrom £621	Free Cancellation	Rating 7.7 280 reviews	Search Vietnam Airlines flights
Singapore Airlines	PriceFrom £669	Free Cancellation	Rating 8.2 1,583 reviews	Search Singapore Airlines flights
Thai Airways	PriceFrom £896	Free Cancellation	Rating 7.9 412 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.

Start using Trips

Find my bookings

Get notified when prices go down

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

1 adult

Wed 26/8

Wed 2/9

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 Cambodia

Airlines

Cabin classes

Other Cambodia destinations

Other flights from London Heathrow Airport

Complete your trip

Feeling lucky

Fly your favourite airline to Siem Reap

Cheap flights from London Heathrow Airport to Siem Reap from £351

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

China Eastern flights from London Heathrow Airport to Siem Reap

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

SWISS flights from London Heathrow Airport to Siem Reap

Our best SWISS 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 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

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

Complete your trip to Siem Reap

Explore popular destinations other users love

According to popular flight searches on momondo this year