In terms of precipitation, rainfall in London ranges from 40.0 - 70.0 inches per month. January is typically the wettest month, when rainfall can reach 70.0 mm. July is typically the driest time to visit London when rainfall is around 40.0 mm.

If weather is an important factor for your trip to London, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 17.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 4.0 C).

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

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

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

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

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

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

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

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

£253+ Cheap Flights from Siem Reap to London

Cheap flight deals from Siem Reap to London

Enter your travel dates to find the best prices.

One-way

One-way flights from Siem Reap to London
Search for one-way flight options from Siem Reap to London. Find affordable one-way fares based on user searches. Data last updated 19 September 2026.

Sun 29/1119:05 -

2 stops30h 10m

Wed 31/1200:00 -

Nonstop0h 00m

Deal found 19/9£253

Fri 13/1119:05 -

3 stops31h 05m

Wed 31/1200:00 -

Nonstop0h 00m

Deal found 15/9£271

Sun 15/1119:30 -

2 stops54h 05m

Wed 31/1200:00 -

Nonstop0h 00m

Deal found 15/9£275

Sat 14/1119:05 -

3 stops31h 05m

Wed 31/1200:00 -

Nonstop0h 00m

Deal found 15/9£285

Sun 29/1119:05 -

3 stops46h 10m

Wed 31/1200:00 -

Nonstop0h 00m

Deal found 16/9£287

Tue 9/309:55 -

2 stops35h 50m

Wed 31/1200:00 -

Nonstop0h 00m

Deal found 15/9£295

Mon 23/1119:30 -

2 stops32h 00m

Wed 31/1200:00 -

Nonstop0h 00m

Deal found 14/9£296

Fri 13/1119:05 -

3 stops46h 10m

Wed 31/1200:00 -

Nonstop0h 00m

Deal found 15/9£299

Sun 22/1121:30 -

2 stops28h 40m

Wed 31/1200:00 -

Nonstop0h 00m

Deal found 14/9£301

Tue 9/322:00 -

3 stops39h 30m

Wed 31/1200:00 -

Nonstop0h 00m

Deal found 15/9£310

Sat 13/322:00 -

3 stops39h 30m

Wed 31/1200:00 -

Nonstop0h 00m

Deal found 16/9£311

Wed 10/319:25 -

2 stops41h 55m

Wed 31/1200:00 -

Nonstop0h 00m

Deal found 15/9£319

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

Siem ReapLondon

SAI Siem Reap–Angkor Intl - LHR London Heathrow

SAILHR

Siem Reap–Angkor Intl

Mon 23/11

19:30-20:30

2 stops32h 00m

London Heathrow

Wed 31/12

00:00-06:00

Nonstop0h 00m

£296

Siem ReapLondon

SAI Siem Reap–Angkor Intl - LHR London Heathrow

SAILHR

Siem Reap–Angkor Intl

Sat 21/11

22:00-17:30

2 stops50h 30m

London Heathrow

Wed 31/12

00:00-06:00

Nonstop0h 00m

£310

Fastest return journey

Siem ReapLondon

SAI Siem Reap–Angkor Intl - LHR London Heathrow

SAILHR

Siem Reap–Angkor Intl

Mon 2/11

21:30-07:15

1 stop16h 45m

London Heathrow

Wed 31/12

00:00-06:00

Nonstop0h 00m

£313

Siem ReapLondon

SAI Siem Reap–Angkor Intl - LGW London Gatwick

SAILGW

Siem Reap–Angkor Intl

Fri 13/11

12:45-06:30

2 stops24h 45m

London Gatwick

Wed 31/12

00:00-06:00

Nonstop0h 00m

£314

Siem ReapLondon

SAI Siem Reap–Angkor Intl - LGW London Gatwick

SAILGW

Siem Reap–Angkor Intl

Sat 14/11

23:50-11:40

2 stops18h 50m

London Gatwick

Wed 31/12

00:00-06:00

Nonstop0h 00m

£322

Siem ReapLondon

SAI Siem Reap–Angkor Intl - LGW London Gatwick

SAILGW

Siem Reap–Angkor Intl

Tue 3/11

13:20-18:25

2 stops36h 05m

London Gatwick

Wed 31/12

00:00-06:00

Nonstop0h 00m

£322

Siem ReapLondon

SAI Siem Reap–Angkor Intl - LHR London Heathrow

SAILHR

Siem Reap–Angkor Intl

Wed 30/12

19:05-20:30

2 stops32h 25m

London Heathrow

Wed 31/12

00:00-06:00

Nonstop0h 00m

£332

Siem ReapLondon

SAI Siem Reap–Angkor Intl - LHR London Heathrow

SAILHR

Siem Reap–Angkor Intl

Thu 29/10

17:05-07:15

2 stops21h 10m

London Heathrow

Wed 31/12

00:00-06:00

Nonstop0h 00m

£338

Siem ReapLondon

SAI Siem Reap–Angkor Intl - LHR London Heathrow

SAILHR

Siem Reap–Angkor Intl

Mon 2/11

13:20-13:50

2 stops55h 30m

London Heathrow

Wed 31/12

00:00-06:00

Nonstop0h 00m

£349

Siem ReapLondon

SAI Siem Reap–Angkor Intl - LGW London Gatwick

SAILGW

Siem Reap–Angkor Intl

Fri 25/9

12:55-12:35

2 stops29h 40m

London Gatwick

Wed 31/12

00:00-06:00

Nonstop0h 00m

£352

Flights are sorted by cheapest return flights first.

Deals found on 14/9

Showing 1-10 of 23 resultsSorted by cheapest first

Best time to book a flight from Siem Reap to London

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

SAI-LHR

SAI-LGW

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 Siem Reap to London

KHSI-LON

SAI-LHR

SAI-LGW

No data available for this route at this time. Please check back soon.

Related info for your journey

Can I find deals for flights from Siem Reap to London that include hotel bookings?
Yes. In addition to deals on Siem Reap to London flights, Cheapflights offers holiday packages that include both flights and hotel.
How can I find direct flights from Siem Reap to London?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Siem Reap to London.
Can I find deals for business class flights from Siem Reap to London?
Yes. Cheapflights offers flight deals from Siem Reap to London by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

Hounslow

Luton

Milton Keynes

Gatwick

Wembley

Slough

Ilford

Hayes

Croydon

Colchester

Eastbourne

Brentford

Enfield

Southend-on-Sea

Barnet

Southall

Watford

Kingston upon Thames

Dagenham

Dover

Browse thousands of different options on Cheapflights for your next trip

Alternative routes

Complete your trip

Direct flights to England

Flights by cabin class

London flight routes

Other flight options

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Alternative routes for Siem Reap to London

Siem Reap to Gatwick flights

Siem Reap to Heathrow flights

Fly with Cheapflights

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

Cheapflights helps you search for flights from Siem Reap to London via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.

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

Cheapflights helps you find that perfect flight to London from Siem Reap 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 Siem Reap to London with no change fees?

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

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

Not ready to book yet? You can track prices for flights from Siem Reap to London on Cheapflights with our Price Alert feature and get notified when better prices are available.

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Cheapflights is completely free to use, so you can start saving the moment you arrive.

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Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 29/11. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Siem Reap to London

One-way flights from Siem Reap to London
Search for one-way flight options from Siem Reap to London. Find affordable one-way fares based on user searches. Data last updated 19 September 2026.

Search for one-way flight options from Siem Reap to London. Find affordable one-way fares based on user searches. Data last updated 19 September 2026.

Cheapflights Fare Finder

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

Best time to book a flight from Siem Reap to London

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

Cheapflights Insights

Related info for your journey

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

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

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

Travelling to a place near London?

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 Siem Reap to London

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

Complete your trip

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

Direct flights to England

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

Search flights from Siem Reap to London by cabin class

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

Other flights to London

Explore flights to London departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on 19 September 2026.

Siem Reap and London flights

Browse other Siem Reap and London flight options. Last updated on 19 September 2026.

Popular flight searches

Check out other popular destinations found by fellow travellers in 2026

Fly with Cheapflights

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

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

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

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

100% Free

Book with Flexibility

Travel Smart

Cheap flights from Siem Reap to London from £253

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 29/11. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Siem Reap to London

One-way flights from Siem Reap to LondonSearch for one-way flight options from Siem Reap to London. Find affordable one-way fares based on user searches. Data last updated 19 September 2026.

Search for one-way flight options from Siem Reap to London. Find affordable one-way fares based on user searches. Data last updated 19 September 2026.

Cheapflights Fare Finder

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

Best time to book a flight from Siem Reap to London

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

Cheapflights Insights

Related info for your journey

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

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

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

Travelling to a place near London?

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 Siem Reap to London

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

Complete your trip

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

Direct flights to England

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

Search flights from Siem Reap to London by cabin class

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

Other flights to London

Explore flights to London departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on 19 September 2026.

Siem Reap and London flights

Browse other Siem Reap and London flight options. Last updated on 19 September 2026.

Popular flight searches

Check out other popular destinations found by fellow travellers in 2026

Fly with Cheapflights

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

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

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

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

100% Free

Book with Flexibility

Travel Smart

One-way flights from Siem Reap to London
Search for one-way flight options from Siem Reap to London. Find affordable one-way fares based on user searches. Data last updated 19 September 2026.