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 16h 50m. China Eastern provides one of the quickest options available for as low as £799. London and Region of Siem Reap are separated by a distance of 6106 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 £384. Users have also found prices from £458 and £511 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.

£304+ 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 13 November 2026.

Sun 6/1210:30 -

3 stops50h 35m

Sun 20/1221:05 -

3 stops40h 25m

Deal found 11/11£608

Sat 5/1206:40 -

2 stops27h 15m

Sun 20/1219:05 -

2 stops25h 55m

Deal found 12/11£634

Fri 4/1210:30 -

2 stops26h 35m

Sat 19/1221:05 -

2 stops40h 25m

Deal found 11/11£645

Sat 5/1210:30 -

2 stops26h 35m

Sat 19/1221:05 -

2 stops40h 25m

Deal found 8/11£647

Sun 6/1213:55 -

2 stops39h 10m

Sun 20/1219:05 -

2 stops31h 05m

Deal found 11/11£656

Tue 1/1210:30 -

2 stops22h 45m

Mon 7/1209:50 -

2 stops27h 40m

Deal found 11/11£661

Sun 15/1119:20 -

2 stops39h 05m

Tue 24/1120:30 -

2 stops29h 40m

Deal found 10/11£663

Mon 16/1108:40 -

2 stops25h 45m

Tue 24/1121:05 -

3 stops51h 25m

Deal found 10/11£669

Mon 7/1220:55 -

2 stops32h 10m

Mon 21/1217:55 -

2 stops29h 00m

Deal found 11/11£670

Sat 5/1206:40 -

2 stops27h 15m

Sat 19/1219:05 -

2 stops25h 55m

Deal found 11/11£677

Sat 5/1212:30 -

2 stops24h 35m

Sat 19/1221:05 -

2 stops27h 25m

Deal found 8/11£684

Sat 5/1212:30 -

2 stops24h 35m

Sun 27/1221:05 -

2 stops40h 20m

Deal found 10/11£688

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 13 November 2026.

Sat 5/1212:30 -

2 stops24h 35m

Sat 19/1221:05 -

2 stops27h 25m

Deal found 8/11£684

Sat 5/1210:30 -

2 stops26h 35m

Sun 27/1222:25 -

2 stops22h 35m

Deal found 10/11£708

Fri 23/406:20 -

2 stops30h 20m

Wed 12/519:40 -

1 stop27h 15m

Deal found 13/11£770

Sat 5/1217:10 -

2 stops42h 20m

Sat 19/1209:55 -

2 stops34h 05m

Deal found 8/11£775

Fri 23/410:10 -

1 stop17h 30m

Wed 12/510:30 -

1 stop26h 25m

Deal found 13/11£837

Thu 3/1220:15 -

2 stops41h 55m

Mon 14/1213:20 -

2 stops35h 55m

Deal found 10/11£842

Sun 3/108:40 -

2 stops27h 05m

Thu 4/217:55 -

2 stops31h 15m

Deal found 12/11£965

Thu 3/1221:20 -

1 stop14h 10m

Mon 14/1219:25 -

1 stop17h 00m

Deal found 13/11£1,031

Sat 5/1210:30 -

3 stops26h 35m

Sat 19/1221:05 -

3 stops47h 55m

Deal found 8/11£705

Mon 14/1210:55 -

2 stops18h 45m

Wed 23/1219:25 -

2 stops21h 30m

Deal found 12/11£1,422

Sat 5/1215:10 -

2 stops34h 35m

Sat 19/1209:50 -

1 stop37h 05m

Deal found 8/11£713

Thu 3/1211:00 -

1 stop26h 30m

Mon 14/1221:30 -

1 stop16h 45m

Deal found 10/11£803

Sat 5/1212:30 -

2 stops22h 35m

Sat 19/1219:05 -

2 stops29h 25m

Deal found 8/11£751

Mon 3/509:25 -

2 stops27h 20m

Sun 9/509:40 -

2 stops28h 45m

Deal found 10/11£903

Thu 14/107:00 -

3 stops28h 45m

Sun 31/109:55 -

3 stops31h 55m

Deal found 9/11£770

Fri 8/111:00 -

1 stop22h 55m

Thu 4/217:05 -

2 stops21h 10m

Deal found 12/11£900

Fri 15/110:30 -

2 stops50h 35m

Sun 31/121:05 -

3 stops40h 25m

Deal found 9/11£917

Tue 12/107:00 -

3 stops24h 50m

Tue 2/215:35 -

2 stops25h 20m

Deal found 9/11£776

Mon 4/111:00 -

1 stop25h 40m

Thu 4/217:05 -

2 stops21h 10m

Deal found 12/11£900

Thu 18/320:15 -

2 stops41h 55m

Sat 10/423:50 -

2 stops43h 05m

Deal found 11/11£1,122

Sat 5/1206:25 -

2 stops27h 30m

Sun 27/1219:05 -

3 stops31h 00m

Deal found 10/11£779

Sun 2/519:50 -

1 stop15h 20m

Sat 8/519:40 -

2 stops28h 10m

Deal found 10/11£907

Sat 5/1206:25 -

3 stops26h 40m

Sat 19/1220:05 -

3 stops33h 50m

Deal found 8/11£810

Mon 4/111:00 -

2 stops23h 40m

Mon 18/121:30 -

1 stop16h 45m

Deal found 13/11£910

Thu 14/119:55 -

3 stops37h 15m

Sun 31/117:40 -

1 stop28h 55m

Deal found 9/11£845

Sat 9/111:00 -

3 stops46h 10m

Thu 4/217:05 -

2 stops21h 10m

Deal found 12/11£983

Mon 14/1214:50 -

3 stops35h 25m

Wed 23/1221:05 -

3 stops31h 30m

Deal found 12/11£916

Thu 14/106:25 -

3 stops26h 50m

Sun 31/118:55 -

2 stops24h 10m

Deal found 9/11£932

Wed 6/108:45 -

2 stops25h 10m

Mon 11/109:05 -

2 stops29h 40m

Deal found 10/11£972

Wed 6/108:20 -

3 stops20h 25m

Mon 11/115:35 -

3 stops26h 00m

Deal found 10/11£975

Find flight deals from London to Siem Reap

Round-trip from	£608
One-way from	£304
Popular in	December
Cheapest in	July
Average price	£786

China Eastern
6/12-20/12
6 total stops
91h 00m total
London to Siem Reap

Search Deals

21/1-31/12
3 total stops
44h 05m total
London to Siem Reap

Search Deals

Highest demand for flights based on searches. 7% potential increase in price (£51 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 3% potential price decrease (£23 potential savings vs. average return price).

Search Deals

Average for round-trip flights in November 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

Sat 5/12

19:45-14:50

3 stops36h 05m

Siem Reap–Angkor Intl

Wed 31/12

00:00-18:00

Nonstop0h 00m

£377

LondonSiem Reap

STN London Stansted - SAI Siem Reap–Angkor Intl

STNSAI

London Stansted

Sat 5/12

12:30-14:50

2 stops43h 20m

Siem Reap–Angkor Intl

Wed 31/12

00:00-18:00

Nonstop0h 00m

£380

LondonSiem Reap

LTN London Luton - SAI Siem Reap–Angkor Intl

LTNSAI

London Luton

Mon 18/1

19:05-16:05

3 stops38h 00m

Siem Reap–Angkor Intl

Wed 31/12

00:00-18:00

Nonstop0h 00m

£388

LondonSiem Reap

LGW London Gatwick - SAI Siem Reap–Angkor Intl

LGWSAI

London Gatwick

Sat 5/12

12:15-14:50

2 stops43h 35m

Siem Reap–Angkor Intl

Wed 31/12

00:00-18:00

Nonstop0h 00m

£392

LondonSiem Reap

LTN London Luton - SAI Siem Reap–Angkor Intl

LTNSAI

London Luton

Tue 8/12

08:05-08:45

3 stops41h 40m

Siem Reap–Angkor Intl

Wed 31/12

00:00-18:00

Nonstop0h 00m

£395

LondonSiem Reap

LTN London Luton - SAI Siem Reap–Angkor Intl

LTNSAI

London Luton

Sat 16/1

04:30-14:50

3 stops27h 20m

Siem Reap–Angkor Intl

Wed 31/12

00:00-18:00

Nonstop0h 00m

£399

LondonSiem Reap

LGW London Gatwick - SAI Siem Reap–Angkor Intl

LGWSAI

London Gatwick

Wed 18/11

10:30-20:05

3 stops26h 35m

Siem Reap–Angkor Intl

Wed 31/12

00:00-18:00

Nonstop0h 00m

£402

LondonSiem Reap

LTN London Luton - SAI Siem Reap–Angkor Intl

LTNSAI

London Luton

Wed 18/11

09:10-16:55

3 stops48h 45m

Siem Reap–Angkor Intl

Wed 31/12

00:00-18:00

Nonstop0h 00m

£405

LondonSiem Reap

LTN London Luton - SAI Siem Reap–Angkor Intl

LTNSAI

London Luton

Mon 14/12

06:00-18:05

3 stops29h 05m

Siem Reap–Angkor Intl

Wed 31/12

00:00-18:00

Nonstop0h 00m

£407

LondonSiem Reap

LHR London Heathrow - SAI Siem Reap–Angkor Intl

LHRSAI

London Heathrow

Mon 7/12

08:40-17:25

2 stops25h 45m

Siem Reap–Angkor Intl

Wed 31/12

00:00-18:00

Nonstop0h 00m

£409

Flights are sorted by cheapest return flights first.

Deals found on 8/11

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.

LGW-SAI

LHR-SAI

STN-SAI

LTN-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

LGW-SAI

LHR-SAI

STN-SAI

LTN-SAI

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

Currently, September is the cheapest month in which you can book a flight from London to Region of Siem Reap (average of £777). Flying from London to Region of Siem Reap in December is currently the most expensive (average of £1,154). 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 £635 and £820 in December.
The cheapest return price found within the last 5 days was £608 on China Eastern (6 Dec–20 Dec).

Reviews of airlines servicing Siem Reap

Check out reviews from past customers who have flown with Singapore Airlines,Vietnam Airlines, andBritish Airways 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

1,633 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

1,633 reviews

Singapore Airlines

8.2

Very Good

1,633 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Anonymous,Jul 2025

DAD - SIN

Vietnam Airlines

7.7

Good

296 reviews

Singapore Airlines

8.2

Very Good

1,633 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Anonymous,Jul 2025

DAD - SIN

British Airways

6.7

Okay

8,282 reviews

Singapore Airlines

8.2

Very Good

1,633 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 16h 50m. China Eastern provides one of the quickest options available for as low as £799. London and Region of Siem Reap are separated by a distance of 6106 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 £384. Users have also found prices from £458 and £511 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, September is the cheapest month in which you can book a flight from London to Region of Siem Reap (average of £777). Flying from London to Region of Siem Reap in December is currently the most expensive (average of £1,154). 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

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Gatwick to Krong Preah Sihanouk flights

Heathrow to Krong Preah Sihanouk flights

Luton to Siem Reap flights

Manchester to Krong Preah Sihanouk flights

Birmingham to Siem Reap flights

Top 3 airlines flying from London to Siem Reap

Airline	Cheapest	Average	Flexibility	On-time
Singapore Airlines	Cheapest£673	Average£836	FlexibilityNo cancel fee	On-time81%	Search Singapore Airlines flights
Vietnam Airlines	Cheapest£753	Average£831	FlexibilityNo cancel fee	On-time81%	Search Vietnam Airlines flights
Thai Airways	Cheapest£902	Average£1,036	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 £304

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 21/1. 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 13 November 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 13 November 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 13 November 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 13 November 2026.

Last-minute flights from London to Siem ReapDiscover last-minute flight deals from London to Siem Reap. Data last updated 13 November 2026 and is based on user searches.

Discover last-minute flight deals from London to Siem Reap. Data last updated 13 November 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 13 November 2026.

Search for one-way flight options from London to Siem Reap. Find affordable one-way fares based on user searches. Data last updated 13 November 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 £635 and £820 in December.The cheapest return price found within the last 5 days was £608 on China Eastern (6 Dec–20 Dec).

Reviews of airlines servicing Siem Reap

Check out reviews from past customers who have flown with Singapore Airlines,Vietnam Airlines, andBritish Airways 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 13 November 2026.

Popular flight searches

Check out other popular destinations found by fellow travellers in 2026

Top 3 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 13 November 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 13 November 2026.

Last-minute flights from London to Siem Reap
Discover last-minute flight deals from London to Siem Reap. Data last updated 13 November 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 13 November 2026.

London to Region of Siem Reap flights typically cost between £635 and £820 in December.
The cheapest return price found within the last 5 days was £608 on China Eastern (6 Dec–20 Dec).