Which stopover airport has the shortest travel time from London 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 to Siem Reap–Angkor Intl?

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

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

Singapore (SIN) was the most common stop: 58% of momondo users choosing one-stop flights on this route connected there.

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

Flights via Kuala Lumpur (KUL) offer the lowest average return price of £564.

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 according to our data. Singapore Airlines is the first choice among our users, with 41% of people opting to fly with this airline when travelling to Siem Reap. Keep in mind that there are 3 different airlines that fly to Siem Reap on a routine basis, so you have a few additional options to choose from.

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

Bangkok (BKK) has the shortest average stopover time for this route: 1h 53m.

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

Prices for flights from London to Siem Reap–Angkor Intl Airport are updated daily.

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

As of November 2026, there are 3 operators available to choose from for flights from London to Siem Reap–Angkor Intl Airport.

How old do you have to be to fly from London 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 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 you'll need for your trip to Siem Reap–Angkor Intl Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Siem Reap–Angkor Intl Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

£297 Cheap Flights from London to Siem Reap in 2026/27

Find the cheapest flights from London to Siem Reap

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Enter your travel dates to find the best prices.

10:30 - 20:05LGW London Gatwick-SAI Siem Reap–Angkor Intl

26h 35m2 stops Shanghai Pu Dong Kunming Changshui

21:05 - 06:30SAI Siem Reap–Angkor Intl-LGW London Gatwick

40h 25m2 stops Kunming Changshui Shanghai Hongqiao Intl

£588China Eastern

Mon, 23 Nov - Tue, 8 Dec

10:30 - 20:05LGW London Gatwick-SAI Siem Reap–Angkor Intl

26h 35m3 stops Shanghai Pu Dong Fuzhou Kunming Changshui

21:05 - 06:30SAI Siem Reap–Angkor Intl-LGW London Gatwick

40h 25m2 stops Kunming Changshui Shanghai Pu Dong

£593China Eastern

Mon, 23 Nov - Tue, 8 Dec

10:30 - 20:05LGW London Gatwick-SAI Siem Reap–Angkor Intl

26h 35m2 stops Shanghai Pu Dong Kunming Changshui

21:05 - 06:30SAI Siem Reap–Angkor Intl-LGW London Gatwick

40h 25m2 stops Kunming Changshui Shanghai Pu Dong

£593China Eastern

Mon, 30 Nov - Tue, 15 Dec

10:40 - 09:55LHR London Heathrow-SAI Siem Reap–Angkor Intl

16h 15m1 stop Singapore Changi

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

29h 30m1 stop Singapore Changi

£756Singapore Airlines

Wed, 17 Feb - Wed, 17 Mar

11:00 - 21:45LHR London Heathrow-SAI Siem Reap–Angkor Intl

27h 45m1 stop Ho Chi Minh City

17:55 - 07:15SAI Siem Reap–Angkor Intl-LHR London Heathrow

20h 20m1 stop Hanoi Noibai

£771Vietnam Airlines

Thu, 26 Nov - Thu, 10 Dec

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

£782Singapore Airlines

Wed, 10 Feb - Tue, 16 Feb

11:00 - 19:40LHR London Heathrow-SAI Siem Reap–Angkor Intl

25h 40m1 stop Hanoi Noibai

18:40 - 07:15SAI Siem Reap–Angkor Intl-LHR London Heathrow

19h 35m1 stop Ho Chi Minh City

£803Vietnam Airlines

Mon, 23 Nov - Mon, 21 Dec

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

22h 20m1 stop Singapore Changi

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

29h 30m1 stop Singapore Changi

£816Singapore Airlines

Sat, 16 Jan - Wed, 17 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

£1,044Thai Airways

Fri, 15 Jan - Sat, 23 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

£1,044Thai Airways

Wed, 13 Jan - Sun, 24 Jan

Cheap last-minute flights

Enter your travel dates to find the best prices.

21:00 - 20:05LHR London Heathrow-SAI Siem Reap–Angkor Intl

40h 05m2 stops Shanghai Pu Dong Kunming Changshui

21:05 - 17:30SAI Siem Reap–Angkor Intl-LHR London Heathrow

51h 25m2 stops Kunming Changshui Shanghai Pu Dong

£624China Eastern

Tue, 10 Nov - Sat, 5 Dec

21:00 - 20:05LHR London Heathrow-SAI Siem Reap–Angkor Intl

40h 05m2 stops Shanghai Pu Dong Kunming Changshui

21:05 - 17:30SAI Siem Reap–Angkor Intl-LHR London Heathrow

51h 25m2 stops Kunming Changshui Shanghai Pu Dong

£627China Eastern

Tue, 10 Nov - Sat, 5 Dec

07:00 - 18:30LTN London Luton-SAI Siem Reap–Angkor Intl

28h 30m3 stops Paris Charles de Gaulle Abu Dhabi Zayed Intl Bangkok Suvarnabhumi

19:25 - 22:00SAI Siem Reap–Angkor Intl-LTN London Luton

33h 35m3 stops Bangkok Suvarnabhumi Abu Dhabi Zayed Intl Paris Charles de Gaulle

£651Multiple Airlines

Tue, 10 Nov - Tue, 17 Nov

13:05 - 16:00LGW London Gatwick-SAI Siem Reap–Angkor Intl

19h 55m1 stop Singapore Changi

16:50 - 06:25SAI Siem Reap–Angkor Intl-LGW London Gatwick

20h 35m1 stop Singapore Changi

£821Singapore Airlines

Tue, 10 Nov - Tue, 17 Nov

11:00 - 21:45LHR London Heathrow-SAI Siem Reap–Angkor Intl

27h 45m1 stop Ho Chi Minh City

17:55 - 07:15SAI Siem Reap–Angkor Intl-LHR London Heathrow

20h 20m1 stop Hanoi Noibai

£837Vietnam Airlines

Tue, 10 Nov - Thu, 3 Dec

11:00 - 21:45LHR London Heathrow-SAI Siem Reap–Angkor Intl

27h 45m1 stop Ho Chi Minh City

17:55 - 07:15SAI Siem Reap–Angkor Intl-LHR London Heathrow

20h 20m1 stop Hanoi Noibai

£838Vietnam Airlines

Tue, 10 Nov - Thu, 3 Dec

20:35 - 16:00LHR London Heathrow-SAI Siem Reap–Angkor Intl

36h 25m1 stop Singapore Changi

10:45 - 15:20SAI Siem Reap–Angkor Intl-LHR London Heathrow

35h 35m1 stop Singapore Changi

£848Singapore Airlines

Tue, 10 Nov - Thu, 3 Dec

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

22h 20m1 stop Singapore Changi

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

29h 30m1 stop Singapore Changi

£851Singapore Airlines

Tue, 10 Nov - Tue, 17 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

£982Thai Airways

Tue, 10 Nov - Sat, 5 Dec

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

£985Thai Airways

Tue, 10 Nov - Sat, 5 Dec

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Austrian Airlines flights from London to Siem Reap

Our best Austrian Airlines deals on London to Siem Reap flight tickets

Austrian Airlines

23 Nov

LHR06:00London Heathrow

29h 30m

2 stops

SAI18:30Siem Reap–Angkor Intl

8 Dec

SAI09:55Siem Reap–Angkor Intl

18h 45m

2 stops

LHR21:40London Heathrow

£741

Austrian Airlines

23 Nov

LHR06:00London Heathrow

29h 30m

2 stops

SAI18:30Siem Reap–Angkor Intl

8 Dec

SAI09:55Siem Reap–Angkor Intl

18h 45m

2 stops

LHR21:40London Heathrow

£750

Singapore Airlines flights from London to Siem Reap

Our best Singapore Airlines deals on London to Siem Reap flight tickets

Singapore Airlines

17 Feb

LHR10:40London Heathrow

16h 15m

1 stop

SAI09:55Siem Reap–Angkor Intl

17 Mar

SAI16:50Siem Reap–Angkor Intl

29h 30m

1 stop

LHR15:20London Heathrow

£756

Singapore Airlines

10 Nov

LGW13:05London Gatwick

19h 55m

1 stop

SAI16:00Siem Reap–Angkor Intl

17 Nov

SAI16:50Siem Reap–Angkor Intl

20h 35m

1 stop

LGW06:25London Gatwick

£821

Singapore Airlines

10 Nov

LHR20:35London Heathrow

36h 25m

1 stop

SAI16:00Siem Reap–Angkor Intl

3 Dec

SAI10:45Siem Reap–Angkor Intl

35h 35m

1 stop

LHR15:20London Heathrow

£848

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

LondonSiem Reap

LGW London Gatwick - SAI Siem Reap–Angkor Intl

LGWSAI

London Gatwick

Mon 23/11

10:30-20:05

2 stops26h 35m

Siem Reap–Angkor Intl

Tue 8/12

21:05-06:30

2 stops40h 25m

£588

LondonSiem Reap

LGW London Gatwick - SAI Siem Reap–Angkor Intl

LGWSAI

London Gatwick

Mon 23/11

10:30-20:05

3 stops26h 35m

Siem Reap–Angkor Intl

Tue 8/12

21:05-06:30

2 stops40h 25m

£593

LondonSiem Reap

LGW London Gatwick - SAI Siem Reap–Angkor Intl

LGWSAI

London Gatwick

Mon 30/11

10:30-20:05

2 stops26h 35m

Siem Reap–Angkor Intl

Tue 15/12

21:05-06:30

2 stops40h 25m

£593

LondonSiem Reap

LHR London Heathrow - SAI Siem Reap–Angkor Intl

LHRSAI

London Heathrow

Wed 17/2

10:40-09:55

1 stop16h 15m

Siem Reap–Angkor Intl

Wed 17/3

16:50-15:20

1 stop29h 30m

£756

LondonSiem Reap

LHR London Heathrow - SAI Siem Reap–Angkor Intl

LHRSAI

London Heathrow

Thu 26/11

11:00-21:45

1 stop27h 45m

Siem Reap–Angkor Intl

Thu 10/12

17:55-07:15

1 stop20h 20m

£771

LondonSiem Reap

LHR London Heathrow - SAI Siem Reap–Angkor Intl

LHRSAI

London Heathrow

Wed 10/2

09:10-09:55

1 stop17h 45m

Siem Reap–Angkor Intl

Tue 16/2

16:50-15:20

1 stop29h 30m

£782

LondonSiem Reap

LHR London Heathrow - SAI Siem Reap–Angkor Intl

LHRSAI

London Heathrow

Mon 23/11

11:00-19:40

1 stop25h 40m

Siem Reap–Angkor Intl

Mon 21/12

18:40-07:15

1 stop19h 35m

£803

LondonSiem Reap

LHR London Heathrow - SAI Siem Reap–Angkor Intl

LHRSAI

London Heathrow

Sat 16/1

10:40-16:00

1 stop22h 20m

Siem Reap–Angkor Intl

Wed 17/2

16:50-15:20

1 stop29h 30m

£816

Fastest return journey

LondonSiem Reap

LHR London Heathrow - SAI Siem Reap–Angkor Intl

LHRSAI

London Heathrow

Fri 15/1

11:50-08:45

1 stop13h 55m

Siem Reap–Angkor Intl

Sat 23/1

09:50-19:35

1 stop16h 45m

£1,044

LondonSiem Reap

LHR London Heathrow - SAI Siem Reap–Angkor Intl

LHRSAI

London Heathrow

Wed 13/1

11:50-08:45

1 stop13h 55m

Siem Reap–Angkor Intl

Sun 24/1

09:50-19:35

1 stop16h 45m

£1,044

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 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 and Siem Reap?

Prices are currently low for flights on this route.

Typical prices usually range from £630 to £814.
The lowest price recently found on this route was £588.

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, with most prices found around £771. If you don’t want to visit Siem Reap in September, then you should wait until January to fly from London, when ticket prices are also cheap, with an average price of £776.

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

You could potentially save up to 27% on your flight if you consider stops on a London to Siem Reap flight.

How have London to Siem Reap flight prices changed over time?

As of November 2026, prices for London to Siem Reap flights are approximately 28% more expensive when compared to flights at the same time last year.

When to book flights from London to Siem Reap

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

Estimated return price

Cheap London to Siem Reap (LON to SAI) flight deals and tips

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

Best price found	£297
Fastest flight time	16h 30m
Direct flights	None

The best one-way flight to Siem Reap from London in the past 72 hours is £297. The best return flight deal from London to Siem Reap found on momondo in the last 72 hours is £588.

The fastest flight from London to Siem Reap takes 16h 30m

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

Search flight deals

Frequently asked questions about flying from London to Siem Reap

How far is London to Siem Reap–Angkor Intl by plane?
The straight-line distance from London to Siem Reap–Angkor Intl is 6077.6 mi. By plane, this route typically takes 16h 30m.
When did momondo last update prices for flights from London to Siem Reap–Angkor Intl Airport?
Prices for flights from London to Siem Reap–Angkor Intl Airport are updated daily.
How many operators does momondo search for flights from London to Siem Reap–Angkor Intl Airport?
As of November 2026, there are 3 operators available to choose from for flights from London to Siem Reap–Angkor Intl Airport.
How old do you have to be to fly from London 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 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 you'll need for your trip to Siem Reap–Angkor Intl Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Siem Reap–Angkor Intl Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.
What is the most popular airline from London to Siem Reap?
Based on momondo bookings for this flight route, the most popular airline on flight routes from London to Siem Reap is Singapore Airlines (59% of total bookings). The next most popular airlines are Vietnam Airlines (21%) and British Airways (20%).

Best airlines flying from London to Siem Reap

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

Airline	Rating	Free Cancellation	Price
Singapore Airlines	PriceFrom £668	Free Cancellation	Rating 8.2 1,633 reviews	Search Singapore Airlines flights
Vietnam Airlines	PriceFrom £747	Free Cancellation	Rating 7.7 297 reviews	Search Vietnam Airlines flights
Thai Airways	PriceFrom £895	Free Cancellation	Rating 7.9 433 reviews	Search Thai Airways flights

Why use momondo?

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

Finding the right flight to Siem Reap from London is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Siem Reap quick and easy, saving you time and money.

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?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from London to Siem Reap.

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 Siem Reap trip

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Cheap flights from London to Siem Reap from £297

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from London to Siem Reap departing on 28/1. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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Austrian Airlines flights from London to Siem Reap

Our best Austrian Airlines deals on London to Siem Reap flight tickets

Singapore Airlines flights from London to Siem Reap

Our best Singapore Airlines deals on London to Siem Reap flight tickets

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Use the filters below to find and compare flights from London to Siem Reap that are best for you.

See travel insights to Siem Reap from

How to get the cheapest flight ticket from London to Siem Reap

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

What is the cheapest month to fly to Siem Reap?

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

How have London to Siem Reap flight prices changed over time?

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

Which airlines fly to Siem Reap?

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

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

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

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

When to book flights from London to Siem Reap

Cheap London to Siem Reap (LON to SAI) flight deals and tips

Best price found

Fastest flight time

Direct flights

Frequently asked questions about flying from London to Siem Reap

Best airlines flying from London to Siem Reap

Compare and see reviews for airlines that fly from London 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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