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.

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

Singapore (SIN) was the most common stop: 61% 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 £562.

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

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

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 55% 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 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 March 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.

£302 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 £755 to £1,430. The lowest price recently found on this route was £605.

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Find the cheapest flights from London to Siem Reap

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One-way

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Enter your travel dates to find the best prices.

21:20 - 20:10

LHR

SAI

40h 50m

2 stops

21:10 - 18:40

SAI

LHR

27h 30m

2 stops

£605China Eastern

Wed, 29 Apr - Wed, 20 May

10:25 - 14:50

LGW

SAI

22h 25m

2 stops

15:35 - 07:25

SAI

LGW

21h 50m

2 stops

£608Multiple Airlines

Fri, 4 Sep - Sat, 3 Oct

11:35 - 18:45

LGW

SAI

25h 10m

2 stops

19:30 - 15:00

SAI

LGW

25h 30m

2 stops

£612Multiple Airlines

Wed, 10 Jun - Wed, 17 Jun

11:35 - 08:45

LGW

SAI

39h 10m

2 stops

21:10 - 15:00

SAI

LGW

47h 50m

3 stops

£630Multiple Airlines

Fri, 10 Apr - Wed, 6 May

08:45 - 18:45

LHR

SAI

28h 00m

2 stops

09:40 - 07:55

SAI

LHR

28h 15m

2 stops

£632SWISS

Thu, 10 Sep - Thu, 24 Sep

09:25 - 18:45

LGW

SAI

27h 20m

2 stops

09:40 - 08:25

SAI

LGW

28h 45m

2 stops

£632SWISS

Tue, 9 Jun - Tue, 16 Jun

10:25 - 14:50

LGW

SAI

22h 25m

2 stops

10:00 - 07:25

SAI

LGW

27h 25m

2 stops

£638Multiple Airlines

Sun, 6 Sep - Sun, 13 Sep

09:25 - 18:45

LGW

SAI

27h 20m

2 stops

09:40 - 08:25

SAI

LGW

28h 45m

2 stops

£647SWISS

Thu, 11 Jun - Tue, 16 Jun

21:05 - 21:30

STN

SAI

42h 25m

2 stops

23:50 - 18:45

SAI

STN

24h 55m

2 stops

£713Emirates

Thu, 16 Apr - Tue, 21 Apr

21:05 - 21:30

STN

SAI

42h 25m

2 stops

23:50 - 18:45

SAI

STN

24h 55m

2 stops

£714Emirates

Sun, 12 Apr - Tue, 12 May

China Eastern flights from London to Siem Reap

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

China Eastern

29 Apr

LHR21:20London Heathrow

40h 50m

3 stops

SAI20:10Siem Reap–Angkor Intl

20 May

SAI21:10Siem Reap–Angkor Intl

27h 30m

2 stops

LHR18:40London Heathrow

£605

China Eastern

29 Apr

LHR21:20London Heathrow

40h 50m

2 stops

SAI20:10Siem Reap–Angkor Intl

22 May

SAI21:10Siem Reap–Angkor Intl

51h 30m

2 stops

LHR18:40London Heathrow

£693

China Eastern

29 Apr

LHR21:20London Heathrow

40h 50m

3 stops

SAI20:10Siem Reap–Angkor Intl

20 May

SAI21:10Siem Reap–Angkor Intl

27h 30m

2 stops

LHR18:40London Heathrow

£706

Etihad Airways flights from London to Siem Reap

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

Etihad Airways

10 Apr

LHR09:15London Heathrow

21h 05m

2 stops

SAI12:20Siem Reap–Angkor Intl

6 May

SAI19:30Siem Reap–Angkor Intl

23h 15m

2 stops

LHR12:45London Heathrow

£785

Etihad Airways

1 Apr

LHR20:45London Heathrow

40h 00m

2 stops

SAI18:45Siem Reap–Angkor Intl

30 Apr

SAI19:30Siem Reap–Angkor Intl

25h 35m

2 stops

LHR15:05London Heathrow

£803

Etihad Airways

29 Mar

LHR09:40London Heathrow

27h 05m

2 stops

SAI18:45Siem Reap–Angkor Intl

30 Apr

SAI19:30Siem Reap–Angkor Intl

23h 15m

2 stops

LHR12:45London Heathrow

£928

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

LondonSiem Reap

LHR - SAI

LHRSAI

London Heathrow

Wed 29/4

21:20-20:10

2 stops40h 50m

Siem Reap–Angkor Intl

Wed 20/5

21:10-18:40

2 stops27h 30m

£605

Fastest return journey

LondonSiem Reap

LGW - SAI

LGWSAI

London Gatwick

Fri 4/9

10:25-14:50

2 stops22h 25m

Siem Reap–Angkor Intl

Sat 3/10

15:35-07:25

2 stops21h 50m

£608

LondonSiem Reap

LGW - SAI

LGWSAI

London Gatwick

Wed 10/6

11:35-18:45

2 stops25h 10m

Siem Reap–Angkor Intl

Wed 17/6

19:30-15:00

2 stops25h 30m

£612

LondonSiem Reap

LGW - SAI

LGWSAI

London Gatwick

Fri 10/4

11:35-08:45

2 stops39h 10m

Siem Reap–Angkor Intl

Wed 6/5

21:10-15:00

3 stops47h 50m

£630

LondonSiem Reap

LHR - SAI

LHRSAI

London Heathrow

Thu 10/9

08:45-18:45

2 stops28h 00m

Siem Reap–Angkor Intl

Thu 24/9

09:40-07:55

2 stops28h 15m

£632

LondonSiem Reap

LGW - SAI

LGWSAI

London Gatwick

Tue 9/6

09:25-18:45

2 stops27h 20m

Siem Reap–Angkor Intl

Tue 16/6

09:40-08:25

2 stops28h 45m

£632

LondonSiem Reap

LGW - SAI

LGWSAI

London Gatwick

Sun 6/9

10:25-14:50

2 stops22h 25m

Siem Reap–Angkor Intl

Sun 13/9

10:00-07:25

2 stops27h 25m

£638

LondonSiem Reap

LGW - SAI

LGWSAI

London Gatwick

Thu 11/6

09:25-18:45

2 stops27h 20m

Siem Reap–Angkor Intl

Tue 16/6

09:40-08:25

2 stops28h 45m

£647

LondonSiem Reap

STN - SAI

STNSAI

London Stansted

Thu 16/4

21:05-21:30

2 stops42h 25m

Siem Reap–Angkor Intl

Tue 21/4

23:50-18:45

2 stops24h 55m

£713

LondonSiem Reap

STN - SAI

STNSAI

London Stansted

Sun 12/4

21:05-21:30

2 stops42h 25m

Siem Reap–Angkor Intl

Tue 12/5

23:50-18:45

2 stops24h 55m

£714

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?

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 £687. 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 £746.

How far in advance should I book a flight to Siem Reap?

You are more likely to see cheaper flights to Siem Reap from London when booking weeks ahead of your departure date. In general, you can expect to find flights to Siem Reap for around £803 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Siem Reap from London for as low as £664 on momondo.

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

You could potentially save up to 4% 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 March 2026, prices for London to Siem Reap flights are approximately 20% 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

Fastest flight time	16h 35m
Direct flights	None

The fastest flight from London to Siem Reap takes 16h 35m

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

Search flight deals

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 35m.
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 March 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 (63% of total bookings). The next most popular airlines are Vietnam Airlines (15%), British Airways (12%), and Thai Airways (9%).

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 £541	Free Cancellation	Rating 7.6 902 reviews	Search Austrian Airlines flights
Lufthansa	PriceFrom £600	Free Cancellation	Rating 6.8 7,870 reviews	Search Lufthansa flights
Vietnam Airlines	PriceFrom £618	Free Cancellation	Rating 7.7 248 reviews	Search Vietnam Airlines flights
Singapore Airlines	PriceFrom £666	Free Cancellation	Rating 8.2 1,484 reviews	Search Singapore Airlines flights
Thai Airways	PriceFrom £861	Free Cancellation	Rating 7.8 394 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 £302

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 11/5. 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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China Eastern flights from London to Siem Reap

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

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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?

How far in advance should I book a flight 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

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.

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