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?

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

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

Flights via Kuala Lumpur (KUL) offer the lowest average return price of £556.

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 54m.

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 50% 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.

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

Singapore (SIN) was the most common stop: 63% of momondo users choosing one-stop flights on this route connected there.

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 May 2026, there are 5 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.

£378 Cheap Flights from London to Siem Reap in 2026

Q: 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 £863 to £636. The lowest price recently found on this route was £576.

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Find the cheapest flights from London to Siem Reap

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09:30 - 09:00

LHR

SAI

41h 30m

2 stops

19:20 - 18:45

SAI

LHR

29h 25m

2 stops

£576Etihad Airways

Fri, 12 Jun - Fri, 26 Jun

10:30 - 21:00

LGW

SAI

27h 30m

3 stops

22:00 - 06:30

SAI

LGW

39h 30m

3 stops

£580China Eastern

Wed, 4 Nov - Sat, 28 Nov

09:30 - 11:15

LHR

SAI

19h 45m

2 stops

19:20 - 18:45

SAI

LHR

29h 25m

2 stops

£588Etihad Airways

Sun, 14 Jun - Tue, 30 Jun

09:25 - 18:55

LGW

SAI

27h 30m

2 stops

09:40 - 08:25

SAI

LGW

28h 45m

2 stops

£679SWISS

Sat, 12 Sep - Wed, 23 Sep

17:00 - 19:05

LGW

SAI

43h 05m

2 stops

22:00 - 06:30

SAI

LGW

39h 30m

2 stops

£695Multiple Airlines

Wed, 4 Nov - Sat, 28 Nov

09:05 - 18:55

LGW

SAI

27h 50m

2 stops

09:40 - 08:25

SAI

LGW

28h 45m

2 stops

£719SWISS

Sun, 14 Jun - Tue, 30 Jun

10:30 - 13:15

LGW

SAI

43h 45m

2 stops

22:00 - 06:30

SAI

LGW

39h 30m

2 stops

£744Multiple Airlines

Fri, 6 Nov - Sat, 28 Nov

20:15 - 21:10

STN

SAI

41h 55m

2 stops

23:50 - 12:05

SAI

STN

43h 15m

2 stops

£760Emirates

Tue, 3 Nov - Sat, 21 Nov

13:00 - 15:55

LGW

SAI

19h 55m

1 stop

10:45 - 09:00

SAI

LGW

29h 15m

1 stop

£761Singapore Airlines

Wed, 4 Nov - Sat, 28 Nov

14:05 - 21:10

STN

SAI

24h 05m

2 stops

23:50 - 17:55

SAI

STN

25h 05m

2 stops

£763Emirates

Wed, 4 Nov - Thu, 19 Nov

China Eastern flights from London to Siem Reap

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

China Eastern

4 Nov

LGW10:30London Gatwick

27h 30m

3 stops

SAI21:00Siem Reap–Angkor Intl

28 Nov

SAI22:00Siem Reap–Angkor Intl

39h 30m

2 stops

LGW06:30London Gatwick

£580

China Eastern

8 Nov

LGW17:00London Gatwick

45h 00m

3 stops

SAI21:00Siem Reap–Angkor Intl

28 Nov

SAI22:00Siem Reap–Angkor Intl

39h 30m

3 stops

LGW06:30London Gatwick

£616

China Eastern

6 Nov

LGW10:30London Gatwick

27h 30m

3 stops

SAI21:00Siem Reap–Angkor Intl

28 Nov

SAI22:00Siem Reap–Angkor Intl

39h 30m

3 stops

LGW06:30London Gatwick

£629

Singapore Airlines flights from London to Siem Reap

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

Singapore Airlines

4 Nov

LGW13:00London Gatwick

19h 55m

1 stop

SAI15:55Siem Reap–Angkor Intl

28 Nov

SAI10:45Siem Reap–Angkor Intl

29h 15m

1 stop

LGW09:00London Gatwick

£761

Singapore Airlines

6 Nov

LGW09:20London Gatwick

23h 35m

1 stop

SAI15:55Siem Reap–Angkor Intl

28 Nov

SAI10:45Siem Reap–Angkor Intl

26h 40m

1 stop

LGW06:25London Gatwick

£789

Singapore Airlines

5 Nov

LHR09:10London Heathrow

23h 45m

1 stop

SAI15:55Siem Reap–Angkor Intl

15 Nov

SAI10:45Siem Reap–Angkor Intl

27h 55m

1 stop

LHR07:40London Heathrow

£790

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

LondonSiem Reap

LHR - SAI

LHRSAI

London Heathrow

Fri 12/6

09:30-09:00

2 stops41h 30m

Siem Reap–Angkor Intl

Fri 26/6

19:20-18:45

2 stops29h 25m

£576

LondonSiem Reap

LGW - SAI

LGWSAI

London Gatwick

Wed 4/11

10:30-21:00

3 stops27h 30m

Siem Reap–Angkor Intl

Sat 28/11

22:00-06:30

3 stops39h 30m

£580

Fastest return journey

LondonSiem Reap

LHR - SAI

LHRSAI

London Heathrow

Sun 14/6

09:30-11:15

2 stops19h 45m

Siem Reap–Angkor Intl

Tue 30/6

19:20-18:45

2 stops29h 25m

£588

LondonSiem Reap

LGW - SAI

LGWSAI

London Gatwick

Sat 12/9

09:25-18:55

2 stops27h 30m

Siem Reap–Angkor Intl

Wed 23/9

09:40-08:25

2 stops28h 45m

£679

LondonSiem Reap

LGW - SAI

LGWSAI

London Gatwick

Wed 4/11

17:00-19:05

2 stops43h 05m

Siem Reap–Angkor Intl

Sat 28/11

22:00-06:30

2 stops39h 30m

£695

LondonSiem Reap

LGW - SAI

LGWSAI

London Gatwick

Sun 14/6

09:05-18:55

2 stops27h 50m

Siem Reap–Angkor Intl

Tue 30/6

09:40-08:25

2 stops28h 45m

£719

LondonSiem Reap

LGW - SAI

LGWSAI

London Gatwick

Fri 6/11

10:30-13:15

2 stops43h 45m

Siem Reap–Angkor Intl

Sat 28/11

22:00-06:30

2 stops39h 30m

£744

LondonSiem Reap

STN - SAI

STNSAI

London Stansted

Tue 3/11

20:15-21:10

2 stops41h 55m

Siem Reap–Angkor Intl

Sat 21/11

23:50-12:05

2 stops43h 15m

£760

LondonSiem Reap

LGW - SAI

LGWSAI

London Gatwick

Wed 4/11

13:00-15:55

1 stop19h 55m

Siem Reap–Angkor Intl

Sat 28/11

10:45-09:00

1 stop29h 15m

£761

LondonSiem Reap

STN - SAI

STNSAI

London Stansted

Wed 4/11

14:05-21:10

2 stops24h 05m

Siem Reap–Angkor Intl

Thu 19/11

23:50-17:55

2 stops25h 05m

£763

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

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Stopovers

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?

The month of May is, on average, the cheapest month to fly to Siem Reap from London, with most prices found around £524. If you don’t want to visit Siem Reap in May, then you should wait until March to fly from London, when ticket prices are also cheap, with an average price of £534.

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

You could potentially save up to 13% 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 May 2026, prices for London to Siem Reap flights are approximately 20% cheaper 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

Fastest flight time	17h 30m
Direct flights	None

The fastest flight from London to Siem Reap takes 17h 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 17h 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 May 2026, there are 5 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 (56% of total bookings). The next most popular airlines are Vietnam Airlines (17%), British Airways (14%), and Thai Airways (7%).

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
Austrian Airlines	PriceFrom £535	Free Cancellation	Rating 7.6 915 reviews	Search Austrian Airlines flights
Lufthansa	PriceFrom £593	Free Cancellation	Rating 6.8 7,993 reviews	Search Lufthansa flights
Vietnam Airlines	PriceFrom £614	Free Cancellation	Rating 7.7 268 reviews	Search Vietnam Airlines flights
Singapore Airlines	PriceFrom £659	Free Cancellation	Rating 8.2 1,510 reviews	Search Singapore Airlines flights
Thai Airways	PriceFrom £855	Free Cancellation	Rating 7.9 401 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.

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Cheap flights from London to Siem Reap from £378

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 20/5. 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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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

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

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

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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.

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