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Cheap flights from Siem Reap, Cambodia to London from £252

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 10/3. Fares are subject to change and may not be available on all flights or dates of travel.
SAI — LON
15 Feb — 22 Feb1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Siem Reap to London

Discover tips and strategies to find the most affordable flight options for your journey from Siem Reap (SAI) to London (LON). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 16 January 2026.

Round-trip from

£815

One-way from

£252
18/2-21/2
  • 18/2-21/2
  • 3 total stops
  • 53h 25m total
  • Siem Reap to London
Search Deals
China Eastern
  • China Eastern
  • 10/3
  • 2 total stops
  • 26h 30m total
  • Siem Reap to London
Search Deals

Find flight deals from Siem Reap to London

Enter your travel dates to find the best prices.

Cheapest flights from Siem Reap to London
Explore the most affordable flight options available from Siem Reap to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 16 January 2026.

Tue 10/322:00
SAI
-
LHR
2 stops26h 30m
China Eastern
Wed 11/321:00
LHR
-
SAI
3 stops65h 00m
China Eastern
Deal found 15/1£613
Wed 1/421:10
SAI
-
LHR
3 stops51h 30m
China Eastern
Tue 7/421:20
LHR
-
SAI
3 stops64h 50m
China Eastern
Deal found 15/1£625
Wed 1/421:10
SAI
-
LHR
2 stops51h 30m
Multiple Airlines
Tue 7/421:35
LHR
-
SAI
1 stop30h 25m
Multiple Airlines
Deal found 15/1£634
Tue 10/322:00
SAI
-
LHR
2 stops26h 30m
Multiple Airlines
Wed 11/321:00
LHR
-
SAI
2 stops29h 10m
Multiple Airlines
Deal found 15/1£745
Wed 18/218:10
SAI
-
LHR
2 stops24h 30m
Multiple Airlines
Sat 21/221:25
LHR
-
SAI
1 stop28h 55m
Multiple Airlines
Deal found 15/1£815
Wed 18/218:50
SAI
-
LGW
2 stops23h 50m
Multiple Airlines
Sat 21/223:55
LGW
-
SAI
2 stops36h 10m
Multiple Airlines
Deal found 15/1£844
Wed 1/416:00
SAI
-
LGW
1 stop20h 55m
Singapore Airlines
Tue 7/410:15
LGW
-
SAI
1 stop17h 25m
Singapore Airlines
Deal found 15/1£875
Tue 10/323:50
SAI
-
LGW
1 stop18h 50m
Emirates
Wed 11/320:25
LGW
-
SAI
2 stops17h 45m
Emirates
Deal found 15/1£878
Sun 1/217:55
SAI
-
LHR
1 stop20h 20m
Multiple Airlines
Sun 8/221:00
LHR
-
SAI
2 stops41h 00m
Multiple Airlines
Deal found 15/1£906
Tue 10/310:45
SAI
-
LHR
1 stop26h 10m
Singapore Airlines
Wed 11/310:40
LHR
-
SAI
1 stop22h 15m
Singapore Airlines
Deal found 15/1£907
Tue 10/323:50
SAI
-
LGW
1 stop18h 50m
Multiple Airlines
Wed 11/316:00
LGW
-
SAI
1 stop22h 10m
Multiple Airlines
Deal found 15/1£919
Sun 1/210:45
SAI
-
LHR
1 stop26h 10m
Singapore Airlines
Sun 8/209:10
LHR
-
SAI
1 stop17h 40m
Singapore Airlines
Deal found 14/1£922

Cheapflights Fare Finder

 
Customise your flight search to find flights from Siem Reap to London that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 16 January 2026.
Use the filters below to find and compare flights from Siem Reap to London that are best for you.

Fly from

Siem Reap

Fly to

London

Route

Depart

Return

Price

Siem ReapLondon

SAI - LHR

SAILHR

Siem Reap–Angkor Intl

Wed 18/2

18:10-11:40

2 stops24h 30m

London Heathrow

Sat 21/2

21:25-09:20

1 stop28h 55m

£815

Siem ReapLondon

SAI - LGW

SAILGW

Siem Reap–Angkor Intl

Wed 18/2

18:50-11:40

2 stops23h 50m

London Gatwick

Sat 21/2

23:55-19:05

2 stops36h 10m

£844

Siem ReapLondon

SAI - LHR

SAILHR

Siem Reap–Angkor Intl

Sun 1/2

17:55-07:15

1 stop20h 20m

London Heathrow

Sun 8/2

21:00-21:00

2 stops41h 00m

£906

Siem ReapLondon

SAI - LHR

SAILHR

Siem Reap–Angkor Intl

Sun 1/2

10:45-05:55

1 stop26h 10m

London Heathrow

Sun 8/2

09:10-09:50

1 stop17h 40m

£922

Siem ReapLondon

SAI - LGW

SAILGW

Siem Reap–Angkor Intl

Sun 1/2

09:20-14:00

2 stops35h 40m

London Gatwick

Sun 8/2

23:55-21:10

2 stops38h 15m

£943

Siem ReapLondon

SAI - LHR

SAILHR

Siem Reap–Angkor Intl

Sun 1/2

09:55-20:40

2 stops41h 45m

London Heathrow

Sun 8/2

10:20-18:45

2 stops25h 25m

£969

Siem ReapLondon

SAI - LHR

SAILHR

Siem Reap–Angkor Intl

Sun 1/2

09:55-06:40

2 stops27h 45m

London Heathrow

Sun 8/2

13:55-18:45

2 stops21h 50m

£980

Siem ReapLondon

SAI - LGW

SAILGW

Siem Reap–Angkor Intl

Sun 1/2

10:45-06:25

1 stop26h 40m

London Gatwick

Sun 8/2

09:25-09:50

1 stop17h 25m

£1,035

Siem ReapLondon

SAI - LGW

SAILGW

Siem Reap–Angkor Intl

Wed 18/2

10:45-06:25

1 stop26h 40m

London Gatwick

Sat 21/2

09:20-15:55

1 stop23h 35m

£1,606

Siem ReapLondon

SAI - LHR

SAILHR

Siem Reap–Angkor Intl

Tue 10/3

22:00-17:30

2 stops26h 30m

£252

Flights are sorted by cheapest return flights first.

Deals found on 14/1

Showing 1-10 of 27 results
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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.
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
No data available for this route at this time. Please check back soon.

Related info for your journey

Find useful and relevant information for your journey from Siem Reap to London. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

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

    Siem Reap–Angkor Intl (SAI), located 24.7 mi from the city center, is the airport you fly out of when you book flights from Siem Reap to London. 0 airlines have flights from Siem Reap–Angkor Intl to London on a regular basis. Booking flights from Siem Reap–Angkor Intl to London should not be difficult; the airport handles an average of 0 outbound flights to London per day.

  • How long is the flight from Siem Reap to London?

    A quick flight from Siem Reap to London can take about 26h 10m. Singapore Airlines provides one of the quickest options available for as low as £922. The distance from Siem Reap to London is about 6106 mi.

  • 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.

See more FAQs

Travelling to a place near London?

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Gatwick
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Wembley
Ilford
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Alternative routes for Siem Reap to London

See prices for flight routes from nearby airports that may be better suited for you.
Siem Reap to Gatwick flights
Siem Reap to Heathrow flights

Fly with Cheapflights

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

900+ travel sites are searched through when a user searches for a flight using Cheapflights. From the search interface, users can use filters to choose airlines, airports, flight times, cabin classes and more to their preference. Book your flight to London from Siem Reap today with Cheapflights!

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

It’s simple! Cheapflights, which is free to use for everyone, saves millions of users time and money every year by helping them find the cheapest and most suitable flights from Siem Reap to London.

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

Certainly. Search results for flights to London from Siem Reap shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

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

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

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