How long is the flight from London to Region of Siem Reap?

A quick flight from London to Region of Siem Reap can take about 14h 25m. SWISS provides one of the quickest options available for as low as £754. London and Region of 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 to fly from London to Region of Siem Reap one-way?

For one-way options, check prices for Austrian Airlines. According to our data, you can fly for as low as £376. Users have also found prices from £448 and £500 on Vietnam Airlines and Singapore Airlines, respectively.

In terms of precipitation, rainfall in Region of 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 Region of Siem Reap when rainfall is around 0.0 mm.

If weather is an important factor for your trip to Region of 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 Region of Siem Reap?

Most travelers choose London Heathrow - Siem Reap–Angkor Intl, London Gatwick - Siem Reap–Angkor Intl or London Stansted - Siem Reap–Angkor Intl when deciding on the best route from London to Region of Siem Reap.

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

Consider Singapore Airlines, Vietnam Airlines or Thai Airways when booking your flight. These represent the most popular airlines when flying from London to Region of Siem Reap.

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

When flying from London to Region of Siem Reap, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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.

£286+ Cheap Flights from London to Siem Reap

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 1 September 2026.

Thu 10/911:15 -

2 stops24h 50m

Thu 8/1019:05 -

2 stops41h 55m

Deal found 28/8£529

Thu 3/1206:00 -

2 stops29h 45m

Mon 14/1209:55 -

2 stops35h 10m

Deal found 31/8£612

Mon 28/918:55 -

1 stop16h 15m

Mon 25/121:30 -

1 stop16h 45m

Deal found 30/8£625

Sun 8/1106:00 -

2 stops29h 45m

Wed 27/116:50 -

2 stops25h 25m

Deal found 29/8£626

Mon 30/1106:00 -

2 stops29h 45m

Sun 13/1209:55 -

2 stops18h 45m

Deal found 28/8£635

Sun 27/919:50 -

1 stop15h 20m

Wed 27/118:40 -

1 stop19h 35m

Deal found 30/8£638

Tue 10/1119:25 -

2 stops40h 20m

Sat 5/1209:55 -

2 stops29h 25m

Deal found 31/8£640

Mon 30/1111:35 -

2 stops23h 30m

Sun 13/1213:20 -

1 stop33h 15m

Deal found 28/8£647

Sat 7/1107:55 -

3 stops25h 10m

Fri 13/1119:05 -

3 stops31h 55m

Deal found 28/8£647

Wed 30/906:00 -

2 stops30h 55m

Wed 7/1019:35 -

2 stops18h 45m

Deal found 31/8£652

Thu 3/911:15 -

2 stops24h 50m

Thu 24/912:55 -

2 stops24h 00m

Deal found 29/8£653

Tue 1/1219:25 -

2 stops16h 20m

Sun 13/1209:55 -

2 stops18h 45m

Deal found 28/8£653

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 1 September 2026.

Mon 30/1108:35 -

2 stops27h 10m

Sun 13/1209:55 -

2 stops28h 55m

Deal found 28/8£753

Tue 1/1221:20 -

1 stop14h 25m

Fri 11/1219:25 -

1 stop17h 00m

Deal found 28/8£754

Wed 30/914:55 -

2 stops24h 35m

Tue 6/1023:50 -

2 stops24h 55m

Deal found 31/8£766

Fri 27/1111:00 -

1 stop25h 40m

Tue 15/1217:55 -

2 stops44h 20m

Deal found 28/8£782

Fri 25/919:30 -

2 stops17h 25m

Tue 29/919:35 -

2 stops42h 20m

Deal found 1/9£808

Thu 1/1017:35 -

2 stops19h 20m

Tue 6/1019:35 -

2 stops27h 15m

Deal found 31/8£902

Thu 3/1209:20 -

2 stops20h 20m

Mon 14/1219:25 -

2 stops31h 10m

Deal found 31/8£1,260

Thu 3/1221:20 -

1 stop14h 25m

Mon 14/1219:25 -

1 stop17h 00m

Deal found 29/8£754

Thu 1/1021:05 -

2 stops42h 25m

Wed 14/1012:55 -

2 stops35h 50m

Deal found 27/8£770

Thu 3/1211:00 -

1 stop26h 30m

Mon 14/1218:40 -

1 stop19h 35m

Deal found 29/8£782

Fri 2/1006:20 -

3 stops22h 15m

Tue 6/1019:10 -

2 stops20h 20m

Deal found 30/8£809

Thu 3/1221:20 -

1 stop14h 25m

Fri 11/1219:25 -

1 stop17h 00m

Deal found 28/8£754

Tue 1/1213:30 -

2 stops22h 15m

Mon 14/1209:55 -

2 stops29h 45m

Deal found 28/8£871

Wed 30/909:05 -

2 stops30h 25m

Mon 25/113:20 -

2 stops31h 30m

Deal found 31/8£797

Tue 10/1111:00 -

1 stop26h 30m

Thu 3/1217:05 -

2 stops21h 10m

Deal found 31/8£801

Mon 16/1114:05 -

2 stops24h 05m

Tue 1/1223:50 -

2 stops19h 15m

Deal found 29/8£802

Mon 18/114:05 -

2 stops24h 05m

Mon 1/219:10 -

3 stops29h 45m

Deal found 31/8£909

Tue 10/1111:00 -

1 stop26h 30m

Sat 5/1221:30 -

2 stops40h 45m

Deal found 31/8£828

Tue 1/1209:15 -

2 stops26h 30m

Sat 12/1209:55 -

2 stops33h 45m

Deal found 28/8£970

Tue 29/909:05 -

2 stops21h 10m

Tue 6/1023:50 -

2 stops18h 45m

Deal found 31/8£808

Thu 14/114:20 -

3 stops24h 25m

Mon 1/209:50 -

2 stops19h 05m

Deal found 28/8£971

Thu 3/1223:55 -

2 stops38h 15m

Mon 14/1213:20 -

2 stops29h 20m

Deal found 29/8£811

Tue 29/909:15 -

2 stops27h 40m

Wed 7/1009:40 -

2 stops29h 00m

Deal found 31/8£1,085

Fri 25/909:05 -

2 stops30h 25m

Tue 29/923:50 -

2 stops26h 25m

Deal found 30/8£816

Fri 2/1009:20 -

2 stops20h 55m

Tue 6/1019:35 -

2 stops42h 20m

Deal found 30/8£1,318

Mon 14/1206:50 -

3 stops28h 50m

Sun 3/119:10 -

3 stops29h 35m

Deal found 29/8£1,031

Wed 30/908:25 -

2 stops21h 50m

Wed 28/1019:25 -

2 stops42h 50m

Deal found 31/8£1,332

Wed 30/914:55 -

2 stops24h 35m

Wed 28/1013:20 -

2 stops29h 45m

Deal found 31/8£836

Fri 11/1207:00 -

2 stops24h 25m

Sun 27/1217:55 -

2 stops27h 40m

Deal found 31/8£1,033

Tue 17/1109:15 -

2 stops26h 30m

Tue 1/1209:55 -

2 stops29h 45m

Deal found 29/8£1,187

Find flight deals from London to Siem Reap

Round-trip from	£612
One-way from	£286
Popular in	December
Cheapest in	July
Average price	£765

Austrian Airlines
3/12-14/12
4 total stops
64h 55m total
London to Siem Reap

Search Deals

7/9
3 total stops
42h 25m total
London to Siem Reap

Search Deals

Highest demand for flights based on searches. 9% potential increase in price (£62 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 4% potential price decrease (£24 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

LGW London Gatwick - SAI Siem Reap–Angkor Intl

LGWSAI

London Gatwick

Mon 30/11

08:35-18:45

2 stops27h 10m

Siem Reap–Angkor Intl

Sun 13/12

09:55-07:50

2 stops28h 55m

£753

Fastest return journey

LondonSiem Reap

LGW London Gatwick - SAI Siem Reap–Angkor Intl

LGWSAI

London Gatwick

Tue 1/12

21:20-18:45

1 stop14h 25m

Siem Reap–Angkor Intl

Fri 11/12

19:25-05:25

1 stop17h 00m

£754

LondonSiem Reap

LGW London Gatwick - SAI Siem Reap–Angkor Intl

LGWSAI

London Gatwick

Thu 3/12

21:20-18:45

1 stop14h 25m

Siem Reap–Angkor Intl

Mon 14/12

19:25-05:25

1 stop17h 00m

£754

LondonSiem Reap

LGW London Gatwick - SAI Siem Reap–Angkor Intl

LGWSAI

London Gatwick

Thu 3/12

21:20-18:45

1 stop14h 25m

Siem Reap–Angkor Intl

Fri 11/12

19:25-05:25

1 stop17h 00m

£754

LondonSiem Reap

STN London Stansted - SAI Siem Reap–Angkor Intl

STNSAI

London Stansted

Wed 30/9

14:55-21:30

2 stops24h 35m

Siem Reap–Angkor Intl

Tue 6/10

23:50-18:45

2 stops24h 55m

£766

LondonSiem Reap

STN London Stansted - SAI Siem Reap–Angkor Intl

STNSAI

London Stansted

Thu 1/10

21:05-21:30

2 stops42h 25m

Siem Reap–Angkor Intl

Wed 14/10

12:55-18:45

2 stops35h 50m

£770

LondonSiem Reap

LHR London Heathrow - SAI Siem Reap–Angkor Intl

LHRSAI

London Heathrow

Fri 27/11

11:00-19:40

1 stop25h 40m

Siem Reap–Angkor Intl

Tue 15/12

17:55-07:15

2 stops44h 20m

£782

LondonSiem Reap

LHR London Heathrow - SAI Siem Reap–Angkor Intl

LHRSAI

London Heathrow

Thu 3/12

11:00-20:30

1 stop26h 30m

Siem Reap–Angkor Intl

Mon 14/12

18:40-07:15

1 stop19h 35m

£782

LondonSiem Reap

LHR London Heathrow - SAI Siem Reap–Angkor Intl

LHRSAI

London Heathrow

Wed 30/9

09:05-21:30

2 stops30h 25m

Siem Reap–Angkor Intl

Mon 25/1

13:20-13:50

2 stops31h 30m

£797

LondonSiem Reap

LHR London Heathrow - SAI Siem Reap–Angkor Intl

LHRSAI

London Heathrow

Tue 10/11

11:00-20:30

1 stop26h 30m

Siem Reap–Angkor Intl

Thu 3/12

17:05-07:15

2 stops21h 10m

£801

Flights are sorted by cheapest return flights first.

Deals found on 31/8

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.

STN-SAI

LTN-SAI

LGW-SAI

LHR-SAI

LCY-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-KHSI

STN-SAI

LTN-SAI

LGW-SAI

LHR-SAI

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

Currently, March is the cheapest month in which you can book a flight from London to Region of Siem Reap (average of £710). Flying from London to Region of Siem Reap in December is currently the most expensive (average of £974). 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 Region of Siem Reap?

Airfare is below average for this route at the moment.

London to Region of Siem Reap flights typically cost between £740 and £785 in December.
The cheapest return price found within the last 5 days was £609 on Austrian Airlines (3 Dec–14 Dec).

Reviews of airlines servicing Siem Reap

Check out reviews from past customers who have flown with Singapore Airlines,Thai Airways, andVietnam Airlines from London to Siem Reap to help guide your decision. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Singapore Airlines

8.2

Very Good

1,591 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Anonymous,Jul 2025

DAD - SIN

Person in front laid back his seat. I’m quite tall found it difficult to sit straight lucky seat next to me was empty was able to stretch my legs. Eating my meal was difficult also as seat remained lowered

Singapore Airlines

8.2

Very Good

1,591 reviews

Singapore Airlines

8.2

Very Good

1,591 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Anonymous,Jul 2025

DAD - SIN

Thai Airways

7.9

Good

418 reviews

Singapore Airlines

8.2

Very Good

1,591 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Anonymous,Jul 2025

DAD - SIN

Vietnam Airlines

7.7

Good

286 reviews

Singapore Airlines

8.2

Very Good

1,591 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Anonymous,Jul 2025

DAD - SIN

British Airways

6.7

Okay

8,195 reviews

Singapore Airlines

8.2

Very Good

1,591 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Anonymous,Jul 2025

DAD - SIN

Related info for your journey

How long is the flight from London to Region of Siem Reap?
A quick flight from London to Region of Siem Reap can take about 14h 25m. SWISS provides one of the quickest options available for as low as £754. London and Region of 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 to fly from London to Region of Siem Reap one-way?
For one-way options, check prices for Austrian Airlines. According to our data, you can fly for as low as £376. Users have also found prices from £448 and £500 on Vietnam Airlines and Singapore Airlines, respectively.
What are the most popular routes from London to Region of Siem Reap?
Most travelers choose London Heathrow - Siem Reap–Angkor Intl, London Gatwick - Siem Reap–Angkor Intl or London Stansted - Siem Reap–Angkor Intl when deciding on the best route from London to Region of Siem Reap.
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 Region of Siem Reap?
Currently, March is the cheapest month in which you can book a flight from London to Region of Siem Reap (average of £710). Flying from London to Region of Siem Reap in December is currently the most expensive (average of £974). 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

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Alternative routes for London to Siem Reap

Heathrow to Siem Reap flights

Stansted to Siem Reap flights

Gatwick to Siem Reap flights

London City to Siem Reap flights

Gatwick to Krong Preah Sihanouk flights

Heathrow to Krong Preah Sihanouk flights

Manchester to Siem Reap flights

Luton to Siem Reap flights

Manchester to Krong Preah Sihanouk flights

Birmingham to Siem Reap flights

Edinburgh to Siem Reap flights

Top 4 airlines flying from London to Siem Reap

Airline	Cheapest	Average	Flexibility	On-time
Austrian Airlines	Cheapest£535	Average£682	FlexibilityNo cancel fee	On-time78%	Search Austrian Airlines flights
Vietnam Airlines	Cheapest£612	Average£809	FlexibilityNo cancel fee	On-time81%	Search Vietnam Airlines flights
Singapore Airlines	Cheapest£659	Average£920	FlexibilityNo cancel fee	On-time81%	Search Singapore Airlines flights
Thai Airways	Cheapest£882	Average£1,014	FlexibilityNo cancel fee	On-time77%	Search Thai Airways flights

Fly with Cheapflights

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

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from London to Siem Reap. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

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

Cheapflights taps into our reliable network of hundreds of airlines and travel agencies to find the best deals for flights from London to Siem Reap for you. Better yet — we are completely free to use.

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

Users can book flights with no change fees policies with our dedicated filters. Book flights from London to Siem Reap flexibly with Cheapflights today.

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

Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to Siem Reap from London today and book when prices fit your budget.

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Cheap flights from London to Siem Reap from £286

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 7/9. 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 1 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 1 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 1 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 1 September 2026.

Last-minute flights from London to Siem ReapDiscover last-minute flight deals from London to Siem Reap. Data last updated 1 September 2026 and is based on user searches.

Discover last-minute flight deals from London to Siem Reap. Data last updated 1 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 1 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 1 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 Region of Siem Reap?

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

Airfare is below average for this route at the moment.

London to Region of Siem Reap flights typically cost between £740 and £785 in December.The cheapest return price found within the last 5 days was £609 on Austrian Airlines (3 Dec–14 Dec).

Reviews of airlines servicing Siem Reap

Check out reviews from past customers who have flown with Singapore Airlines,Thai Airways, andVietnam Airlines from London to Siem Reap to help guide your decision. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

How long is the flight from London to Region of Siem Reap?

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

What are the most popular routes from London to Region of 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 Region of 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.

Direct flights to

Book a non-stop flight to one of these other cities located in .

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 1 September 2026.

Popular flight searches

Check out other popular destinations found by fellow travellers in 2026

Top 4 airlines flying from London to Siem Reap

Fly with Cheapflights

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

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

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

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

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Travel Smart

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 1 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 1 September 2026.

Last-minute flights from London to Siem Reap
Discover last-minute flight deals from London to Siem Reap. Data last updated 1 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 1 September 2026.

London to Region of Siem Reap flights typically cost between £740 and £785 in December.
The cheapest return price found within the last 5 days was £609 on Austrian Airlines (3 Dec–14 Dec).