How long is the flight from London to Siem Reap?

A quick flight from London to Siem Reap can take about 14h 30m. SWISS provides one of the quickest options available for as low as £753. London and Siem Reap are separated by a distance of 6102 mi. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

What are the cheapest airlines flying from London to Siem Reap round-trip?

Our cheapest airline available from London to Siem Reap is Austrian Airlines. Our recent data shows that you can find tickets from as low as £537 on this airline. Additional options worth looking into are Vietnam Airlines and Singapore Airlines, starting at £614 and £661 round-trip. Austrian Airlines is priced at 34% lower than the current average price of a flight leaving 3 months from now.

What are the cheapest airlines to fly from London to Siem Reap one-way?

The cheapest airline one-way is Austrian Airlines, with whom users have recently found tickets for as low as £377. However, be on the lookout for offers from Vietnam Airlines and Singapore Airlines, as they are both options that can get you from London to Siem Reap for a low price.

In terms of precipitation, rainfall in Siem Reap ranges from 0.0 - 260.0 inches per month. September is typically the wettest month, when rainfall can reach 260.0 mm. January is typically the driest time to visit Siem Reap when rainfall is around 0.0 mm.

If weather is an important factor for your trip to Siem Reap, use this chart to help with planning. For those seeking warmer temperatures, April is the ideal time of year to visit, when temperatures reach an average of 29.0 C. Travellers hoping to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 24.0 C).

What are the most popular routes from London to Siem Reap?

When deciding which route to take from London to Siem Reap consider London Heathrow - Siem Reap–Angkor Intl, London Gatwick - Siem Reap–Angkor Intl or London Stansted - Siem Reap–Angkor Intl as they are the most popular.

What are the most popular airlines that fly from London to Siem Reap?

When booking a flight from London to Siem Reap, you may want to consider flying on Singapore Airlines, Vietnam Airlines or Thai Airways as they are the most popular for this route.

What is the cheapest time of day to fly from LON to SAI?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from London to Siem Reap as you normally would.

What airport do you fly into for flights to Siem Reap from London?

Located just 24.7 mi from the city center, Siem Reap–Angkor Intl is the airport most travelers will use when flying to Siem Reap from London. Booking flights from London to Siem Reap–Angkor Intl (SAI) should be relatively easy as there are 0 daily inbound flights from London from 4 different airlines.

Can I find deals for flights from London to Siem Reap that include hotel bookings?

Yes. In addition to deals on London to Siem Reap flights, Cheapflights offers holiday packages that include both flights and hotel.

How can I find direct flights from London to Siem Reap?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from London to Siem Reap.

Can I find deals for business class flights from London to Siem Reap?

Yes. Cheapflights offers flight deals from London to Siem Reap by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

£290+ Cheap Flights from London to Siem Reap, Cambodia

Cheap flight deals from London to Siem Reap

Enter your travel dates to find the best prices.

Cheapest

Best

Last-minute

One-way

Cheapest flights from London to Siem Reap
Explore the most affordable flight options available from London to Siem Reap. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 15 September 2026.

Wed 23/911:00 -

2 stops21h 20m

Wed 21/1019:20 -

2 stops41h 10m

Deal found 12/9£534

Wed 16/911:15 -

2 stops23h 55m

Wed 14/1018:05 -

2 stops42h 50m

Deal found 13/9£538

Thu 24/911:35 -

2 stops26h 35m

Wed 21/1021:10 -

2 stops39h 30m

Deal found 11/9£591

Wed 23/912:35 -

2 stops20h 40m

Wed 21/1019:05 -

2 stops30h 15m

Deal found 14/9£618

Mon 9/1117:45 -

3 stops34h 15m

Mon 23/1116:50 -

2 stops30h 05m

Deal found 11/9£627

Thu 3/1206:00 -

2 stops29h 30m

Mon 14/1209:55 -

2 stops18h 45m

Deal found 15/9£627

Thu 26/1113:45 -

2 stops21h 45m

Fri 4/1209:55 -

2 stops18h 45m

Deal found 12/9£648

Tue 10/1107:10 -

3 stops25h 55m

Wed 18/1119:05 -

3 stops31h 25m

Deal found 10/9£653

Thu 26/1117:45 -

3 stops34h 15m

Fri 4/1216:50 -

2 stops33h 30m

Deal found 12/9£656

Wed 16/922:00 -

2 stops38h 05m

Wed 14/1019:10 -

1 stop27h 45m

Deal found 11/9£665

Mon 21/907:15 -

3 stops27h 55m

Tue 29/923:50 -

3 stops28h 20m

Deal found 15/9£670

Tue 10/1107:10 -

3 stops25h 55m

Tue 17/1112:45 -

2 stops24h 45m

Deal found 10/9£672

Best flights from London to Siem Reap
Discover carefully curated flight deals from London to Siem Reap that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 15 September 2026.

Tue 16/208:40 -

2 stops27h 05m

Tue 2/316:50 -

2 stops22h 00m

Deal found 12/9£681

Sat 26/922:15 -

1 stop14h 30m

Wed 21/1019:30 -

1 stop16h 25m

Deal found 12/9£753

Thu 3/1211:00 -

1 stop26h 30m

Mon 14/1218:40 -

1 stop19h 35m

Deal found 13/9£782

Fri 25/914:55 -

2 stops24h 35m

Tue 20/1023:50 -

2 stops24h 55m

Deal found 12/9£786

Thu 31/1207:00 -

2 stops26h 55m

Thu 14/117:05 -

2 stops30h 10m

Deal found 13/9£828

Fri 30/1019:20 -

2 stops32h 35m

Mon 23/1109:55 -

2 stops27h 45m

Deal found 12/9£894

Tue 10/1110:40 -

1 stop22h 20m

Sat 5/1210:45 -

1 stop26h 10m

Deal found 12/9£945

Thu 3/1209:20 -

2 stops20h 20m

Mon 14/1219:25 -

2 stops42h 50m

Deal found 14/9£1,324

Sun 17/118:40 -

2 stops32h 15m

Sun 24/109:55 -

2 stops28h 55m

Deal found 15/9£742

Sat 26/922:15 -

1 stop14h 30m

Fri 23/1019:30 -

1 stop16h 25m

Deal found 13/9£753

Sat 26/914:55 -

2 stops39h 20m

Tue 20/1023:50 -

2 stops24h 55m

Deal found 11/9£788

Tue 10/1111:00 -

1 stop26h 30m

Sat 5/1221:30 -

2 stops40h 45m

Deal found 15/9£828

Tue 10/1108:35 -

2 stops26h 55m

Wed 18/1109:55 -

2 stops28h 45m

Deal found 10/9£759

Thu 1/1017:35 -

2 stops19h 20m

Wed 14/1012:55 -

2 stops33h 45m

Deal found 12/9£836

Thu 3/1221:20 -

1 stop14h 10m

Mon 14/1219:25 -

1 stop17h 00m

Deal found 14/9£779

Thu 3/1209:40 -

2 stops20h 00m

Mon 14/1213:20 -

2 stops29h 20m

Deal found 13/9£811

Wed 30/912:45 -

3 stops26h 45m

Wed 6/119:10 -

3 stops30h 00m

Deal found 14/9£837

Tue 10/1111:00 -

3 stops46h 10m

Thu 3/1217:05 -

2 stops21h 10m

Deal found 11/9£845

Mon 1/213:30 -

2 stops22h 15m

Thu 11/216:50 -

2 stops22h 50m

Deal found 10/9£772

Sat 26/914:55 -

2 stops39h 20m

Sat 24/1023:50 -

2 stops43h 15m

Deal found 13/9£814

Sat 2/108:15 -

3 stops28h 15m

Thu 21/123:50 -

2 stops22h 40m

Deal found 13/9£851

Mon 12/1008:00 -

2 stops28h 55m

Mon 26/1009:55 -

2 stops29h 45m

Deal found 13/9£788

Fri 25/909:05 -

2 stops30h 25m

Tue 29/923:50 -

2 stops20h 35m

Deal found 13/9£819

Wed 30/1211:00 -

2 stops22h 10m

Wed 20/118:40 -

1 stop19h 35m

Deal found 14/9£914

Fri 2/1012:50 -

3 stops26h 20m

Fri 8/119:10 -

3 stops27h 40m

Deal found 14/9£886

Sun 17/113:20 -

2 stops22h 25m

Sun 24/109:55 -

2 stops29h 45m

Deal found 15/9£808

Fri 30/1020:15 -

2 stops17h 55m

Tue 24/1123:50 -

2 stops25h 05m

Deal found 12/9£822

Wed 11/1113:20 -

3 stops24h 50m

Mon 4/115:45 -

3 stops29h 50m

Deal found 13/9£906

Tue 12/109:15 -

2 stops26h 30m

Sun 31/109:55 -

2 stops29h 45m

Deal found 14/9£854

Thu 1/1021:05 -

2 stops42h 25m

Wed 14/1012:55 -

2 stops30h 05m

Deal found 10/9£865

Find flight deals from London to Siem Reap

Round-trip from	£627
One-way from	£290
Popular in	December
Cheapest in	July
Average price	£768

9/11-23/11
5 total stops
64h 20m total
London to Siem Reap

Search Deals

21/9-31/12
3 total stops
39h 30m total
London to Siem Reap

Search Deals

Highest demand for flights based on searches. 6% potential increase in price (£44 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 3% potential price decrease (£22 potential savings vs. average return price).

Search Deals

Average for round-trip flights in September 2026

Search Deals

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

LondonSiem Reap

LTN London Luton - SAI Siem Reap–Angkor Intl

LTNSAI

London Luton

Mon 21/9

20:35-18:05

3 stops39h 30m

Siem Reap–Angkor Intl

Wed 31/12

00:00-18:00

Nonstop0h 00m

£290

LondonSiem Reap

STN London Stansted - SAI Siem Reap–Angkor Intl

STNSAI

London Stansted

Sun 1/11

11:15-15:00

3 stops44h 45m

Siem Reap–Angkor Intl

Wed 31/12

00:00-18:00

Nonstop0h 00m

£334

LondonSiem Reap

STN London Stansted - SAI Siem Reap–Angkor Intl

STNSAI

London Stansted

Tue 8/12

23:20-15:00

2 stops32h 40m

Siem Reap–Angkor Intl

Wed 31/12

00:00-18:00

Nonstop0h 00m

£345

LondonSiem Reap

LGW London Gatwick - SAI Siem Reap–Angkor Intl

LGWSAI

London Gatwick

Tue 8/12

12:15-15:00

2 stops43h 45m

Siem Reap–Angkor Intl

Wed 31/12

00:00-18:00

Nonstop0h 00m

£347

LondonSiem Reap

LGW London Gatwick - SAI Siem Reap–Angkor Intl

LGWSAI

London Gatwick

Wed 20/1

11:35-18:05

2 stops23h 30m

Siem Reap–Angkor Intl

Wed 31/12

00:00-18:00

Nonstop0h 00m

£347

LondonSiem Reap

LTN London Luton - SAI Siem Reap–Angkor Intl

LTNSAI

London Luton

Sun 1/11

19:45-15:00

3 stops36h 15m

Siem Reap–Angkor Intl

Wed 31/12

00:00-18:00

Nonstop0h 00m

£363

LondonSiem Reap

LTN London Luton - SAI Siem Reap–Angkor Intl

LTNSAI

London Luton

Mon 2/11

05:00-15:00

3 stops27h 00m

Siem Reap–Angkor Intl

Wed 31/12

00:00-18:00

Nonstop0h 00m

£365

LondonSiem Reap

LGW London Gatwick - SAI Siem Reap–Angkor Intl

LGWSAI

London Gatwick

Mon 12/10

06:55-14:50

3 stops25h 55m

Siem Reap–Angkor Intl

Wed 31/12

00:00-18:00

Nonstop0h 00m

£366

LondonSiem Reap

LTN London Luton - SAI Siem Reap–Angkor Intl

LTNSAI

London Luton

Sat 31/10

19:45-15:00

3 stops36h 15m

Siem Reap–Angkor Intl

Wed 31/12

00:00-18:00

Nonstop0h 00m

£368

LondonSiem Reap

LGW London Gatwick - SAI Siem Reap–Angkor Intl

LGWSAI

London Gatwick

Thu 15/10

06:40-14:50

3 stops26h 10m

Siem Reap–Angkor Intl

Wed 31/12

00:00-18:00

Nonstop0h 00m

£369

Flights are sorted by cheapest return flights first.

Deals found on 15/9

Showing 1-10 of 60 resultsSorted by cheapest first

...

Best time to book a flight from London to Siem Reap

Have a flexible travel schedule? Discover the best time to fly to Siem Reap from London with our price prediction graph.

LON-SAI

LGW-SAI

LHR-SAI

LTN-SAI

STN-SAI

Estimated return price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from London to Siem Reap

LON-SAI

LGW-SAI

LHR-SAI

LTN-SAI

STN-SAI

What is the cheapest month to book a flight from London to Siem Reap?

Currently, March is the cheapest month in which you can book a flight from London to Siem Reap (average of £740). Flying from London to Siem Reap in December is currently the most expensive (average of £979). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

How much does it cost for a return flight from London to Siem Reap?

Airfare is below average for this route at the moment.

London to Siem Reap flights typically cost between £742 and £839 in November.
The cheapest return price found within the last 5 days was £627 on Multiple Airlines (9 Nov–23 Nov).

What’s the top stopover airport for flights from London to Siem Reap?

Singapore (SIN) – chosen by Cheapflights users on 54% of one-stop itineraries from London to Siem Reap on Cheapflights.

What’s the cheapest stopover airport for flights from London to Siem Reap?

Ho Chi Minh City (SGN) is the most affordable one-stop option, with an average return flight price of £751.

What’s the fastest stopover option from London to Siem Reap?

Flights via Bangkok (BKK) have the shortest average one-way travel time for one-stop routes: 13h 55m.

Which airport typically offers the quickest stopover for flights from London to Siem Reap?

Flights via Bangkok (BKK) offer the fastest connection on this route, with an average stopover time of 1h 39m.

Reviews of airlines servicing Siem Reap

Read through reviews of airlines operating flights from London to Siem Reap, such as Singapore Airlines,Vietnam Airlines, andAustrian Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Singapore Airlines

8.2

Very Good

1,602 reviews

Check prices

Reviews

1 / 20

6.0

Good

Anonymous,Feb 2026

SAI - SIN

The only issue we had was seat selection. Was not easy to change, after they assigned seats. Also, the premium economy seats, are nothing special.. All and all safe flight with minor back issues.

Singapore Airlines

8.2

Very Good

1,602 reviews

Singapore Airlines

8.2

Very Good

1,602 reviews

Check prices

Reviews

1 / 20

6.0

Good

Anonymous,Feb 2026

SAI - SIN

The only issue we had was seat selection. Was not easy to change, after they assigned seats. Also, the premium economy seats, are nothing special.. All and all safe flight with minor back issues.

Vietnam Airlines

7.7

Good

288 reviews

Singapore Airlines

8.2

Very Good

1,602 reviews

Check prices

Reviews

1 / 20

6.0

Good

Anonymous,Feb 2026

SAI - SIN

The only issue we had was seat selection. Was not easy to change, after they assigned seats. Also, the premium economy seats, are nothing special.. All and all safe flight with minor back issues.

Austrian Airlines

7.6

Good

959 reviews

Singapore Airlines

8.2

Very Good

1,602 reviews

Check prices

Reviews

1 / 20

6.0

Good

Anonymous,Feb 2026

SAI - SIN

The only issue we had was seat selection. Was not easy to change, after they assigned seats. Also, the premium economy seats, are nothing special.. All and all safe flight with minor back issues.

British Airways

6.7

Okay

8,226 reviews

Singapore Airlines

8.2

Very Good

1,602 reviews

Check prices

Reviews

1 / 20

6.0

Good

Anonymous,Feb 2026

SAI - SIN

The only issue we had was seat selection. Was not easy to change, after they assigned seats. Also, the premium economy seats, are nothing special.. All and all safe flight with minor back issues.

Related info for your journey

What airport do you fly into for flights to Siem Reap from London?
Located just 24.7 mi from the city center, Siem Reap–Angkor Intl is the airport most travelers will use when flying to Siem Reap from London. Booking flights from London to Siem Reap–Angkor Intl (SAI) should be relatively easy as there are 0 daily inbound flights from London from 4 different airlines.
How long is the flight from London to Siem Reap?
A quick flight from London to Siem Reap can take about 14h 30m. SWISS provides one of the quickest options available for as low as £753. London and Siem Reap are separated by a distance of 6102 mi. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.
What are the cheapest airlines flying from London to Siem Reap round-trip?
Our cheapest airline available from London to Siem Reap is Austrian Airlines. Our recent data shows that you can find tickets from as low as £537 on this airline. Additional options worth looking into are Vietnam Airlines and Singapore Airlines, starting at £614 and £661 round-trip. Austrian Airlines is priced at 34% lower than the current average price of a flight leaving 3 months from now.
What are the cheapest airlines to fly from London to Siem Reap one-way?
The cheapest airline one-way is Austrian Airlines, with whom users have recently found tickets for as low as £377. However, be on the lookout for offers from Vietnam Airlines and Singapore Airlines, as they are both options that can get you from London to Siem Reap for a low price.
What are the most popular routes from London to Siem Reap?
When deciding which route to take from London to Siem Reap consider London Heathrow - Siem Reap–Angkor Intl, London Gatwick - Siem Reap–Angkor Intl or London Stansted - Siem Reap–Angkor Intl as they are the most popular.
Can I find deals for flights from London to Siem Reap that include hotel bookings?
Yes. In addition to deals on London to Siem Reap flights, Cheapflights offers holiday packages that include both flights and hotel.
How can I find direct flights from London to Siem Reap?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from London to Siem Reap.
Can I find deals for business class flights from London to Siem Reap?
Yes. Cheapflights offers flight deals from London to Siem Reap by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
What is the cheapest month to book a flight from London to Siem Reap?
Currently, March is the cheapest month in which you can book a flight from London to Siem Reap (average of £740). Flying from London to Siem Reap in December is currently the most expensive (average of £979). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

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Edinburgh to Siem Reap flights

Top 4 airlines flying from London to Siem Reap

Airline	Cheapest	Average	Flexibility	On-time
Austrian Airlines	Cheapest£537	Average£684	FlexibilityNo cancel fee	On-time78%	Search Austrian Airlines flights
Vietnam Airlines	Cheapest£614	Average£812	FlexibilityNo cancel fee	On-time81%	Search Vietnam Airlines flights
Singapore Airlines	Cheapest£661	Average£927	FlexibilityNo cancel fee	On-time81%	Search Singapore Airlines flights
Thai Airways	Cheapest£905	Average£1,017	FlexibilityNo cancel fee	On-time77%	Search Thai Airways flights

Fly with Cheapflights

How does Cheapflights help users find flights from London to Siem Reap?

When you search for this flight from London to Siem Reap, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.

Why should you use Cheapflights to find cheap flight tickets from London to Siem Reap?

Cheapflights helps you find that perfect flight to Siem Reap from London by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

Can Cheapflights find flights from London to Siem Reap with no change fees?

Need flexible booking options for your flight to Siem Reap from London? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.

Can Cheapflights notify me if prices for flights from London to Siem Reap become cheaper?

Of course! You can now track prices for flights from London to Siem Reap and get an alert from Cheapflights when they change. Have a valid email address ready and click the bell icon next to the flight deals above to set up your price alerts.

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Cheap flights from London to Siem Reap, Cambodia from £290

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 21/9. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from London to Siem Reap

Cheapest flights from London to Siem ReapExplore the most affordable flight options available from London to Siem Reap. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 15 September 2026.

Explore the most affordable flight options available from London to Siem Reap. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 15 September 2026.

Best flights from London to Siem ReapDiscover carefully curated flight deals from London to Siem Reap that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 15 September 2026.

Discover carefully curated flight deals from London to Siem Reap that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 15 September 2026.

Last-minute flights from London to Siem ReapDiscover last-minute flight deals from London to Siem Reap. Data last updated 15 September 2026 and is based on user searches.

Discover last-minute flight deals from London to Siem Reap. Data last updated 15 September 2026 and is based on user searches.

One-way flights from London to Siem ReapSearch for one-way flight options from London to Siem Reap. Find affordable one-way fares based on user searches. Data last updated 15 September 2026.

Search for one-way flight options from London to Siem Reap. Find affordable one-way fares based on user searches. Data last updated 15 September 2026.

Find flight deals from London to Siem Reap

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Cheapflights Fare Finder

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

Best time to book a flight from London to Siem Reap

Have a flexible travel schedule? Discover the best time to fly to Siem Reap from London with our price prediction graph.

Cheapflights Insights

What is the cheapest month to book a flight from London to Siem Reap?

How much does it cost for a return flight from London to Siem Reap?

Airfare is below average for this route at the moment.

London to Siem Reap flights typically cost between £742 and £839 in November.The cheapest return price found within the last 5 days was £627 on Multiple Airlines (9 Nov–23 Nov).

What’s the top stopover airport for flights from London to Siem Reap?

Share of one-stop return flights from London to Siem Reap chosen by Cheapflights users in the past 12 months, using the same stopover each way.

Singapore (SIN) – chosen by Cheapflights users on 54% of one-stop itineraries from London to Siem Reap on Cheapflights.

What’s the cheapest stopover airport for flights from London to Siem Reap?

Average return fare for one-stop flights from London to Siem Reap, chosen by Cheapflights users in the past 12 months, with the same stopover each way.

Ho Chi Minh City (SGN) is the most affordable one-stop option, with an average return flight price of £751.

What’s the fastest stopover option from London to Siem Reap?

Shortest average travel time for one-stop one-way flights from London to Siem Reap, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by stopover airport.

Flights via Bangkok (BKK) have the shortest average one-way travel time for one-stop routes: 13h 55m.

Which airport typically offers the quickest stopover for flights from London to Siem Reap?

Average stopover duration for one-stop one-way flights from London to Siem Reap, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.

Flights via Bangkok (BKK) offer the fastest connection on this route, with an average stopover time of 1h 39m.

Reviews of airlines servicing Siem Reap

Read through reviews of airlines operating flights from London to Siem Reap, such as Singapore Airlines,Vietnam Airlines, andAustrian Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

What airport do you fly into for flights to Siem Reap from London?

How long is the flight from London to Siem Reap?

What are the cheapest airlines flying from London to Siem Reap round-trip?

What are the cheapest airlines to fly from London to Siem Reap one-way?

What are the most popular routes from London to Siem Reap?

Can I find deals for flights from London to Siem Reap that include hotel bookings?

How can I find direct flights from London to Siem Reap?

Can I find deals for business class flights from London to Siem Reap?

What is the cheapest month to book a flight from London to Siem Reap?

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for London to Siem Reap

See prices for flight routes from nearby airports that may be better suited for you.

Complete your trip

Complete your trip to Siem Reap by adding a car hire and/or hotel booking to your travel itinerary.

Search flights from London to Siem Reap by cabin class

Find flights from London to Siem Reap, based on your preferred cabin class, be it economy, premium economy, business, or first class.

London and Siem Reap flights

Browse other London and Siem Reap flight options. Last updated on 15 September 2026.

Other flights from London

Browse through other flights departing from London. Flights are based on user searches made on Cheapflights and were last updated on 15 September 2026.

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Top 4 airlines flying from London to Siem Reap

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Cheapest flights from London to Siem Reap
Explore the most affordable flight options available from London to Siem Reap. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 15 September 2026.

Best flights from London to Siem Reap
Discover carefully curated flight deals from London to Siem Reap that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 15 September 2026.

Last-minute flights from London to Siem Reap
Discover last-minute flight deals from London to Siem Reap. Data last updated 15 September 2026 and is based on user searches.

One-way flights from London to Siem Reap
Search for one-way flight options from London to Siem Reap. Find affordable one-way fares based on user searches. Data last updated 15 September 2026.

London to Siem Reap flights typically cost between £742 and £839 in November.
The cheapest return price found within the last 5 days was £627 on Multiple Airlines (9 Nov–23 Nov).