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Cheap flights from Siem Reap, Cambodia to London from £248

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 26/3. Fares are subject to change and may not be available on all flights or dates of travel.
SAI — LON
5 Apr — 12 Apr1
1 adult
1 adult, Economy, 0 bags

Cheap 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 6 March 2026.

Wed 3/621:10
SAI
-
LGW
2 stops63h 30m
China Eastern
Wed 24/618:25
LGW
-
SAI
2 stops43h 45m
China Eastern
Deal found 4/3£530
Wed 3/621:10
SAI
-
LHR
2 stops27h 30m
China Eastern
Wed 24/621:20
LHR
-
SAI
2 stops40h 50m
China Eastern
Deal found 4/3£545
Mon 11/509:40
SAI
-
LHR
2 stops27h 15m
Multiple Airlines
Fri 29/510:00
LHR
-
SAI
2 stops26h 45m
Multiple Airlines
Deal found 6/3£722
Wed 3/621:10
SAI
-
LHR
2 stops27h 30m
Multiple Airlines
Wed 24/618:55
LHR
-
SAI
1 stop16h 15m
Multiple Airlines
Deal found 4/3£731
Mon 11/519:30
SAI
-
LGW
2 stops41h 25m
Multiple Airlines
Fri 29/510:40
LGW
-
SAI
2 stops26h 05m
Multiple Airlines
Deal found 6/3£743
Tue 2/623:50
SAI
-
LGW
2 stops18h 45m
Emirates
Thu 25/610:05
LGW
-
SAI
2 stops20h 10m
Emirates
Deal found 4/3£759
Mon 1/614:50
SAI
-
LHR
3 stops21h 40m
Multiple Airlines
Tue 23/616:00
LHR
-
SAI
3 stops36h 50m
Multiple Airlines
Deal found 4/3£768
Mon 1/612:55
SAI
-
LHR
2 stops37h 20m
Emirates
Tue 23/620:40
LHR
-
SAI
2 stops42h 50m
Emirates
Deal found 4/3£785
Mon 1/612:55
SAI
-
LGW
2 stops29h 40m
Emirates
Tue 23/610:05
LGW
-
SAI
2 stops20h 10m
Emirates
Deal found 4/3£808
Tue 2/619:05
SAI
-
LHR
2 stops29h 35m
Multiple Airlines
Thu 25/618:55
LHR
-
SAI
1 stop17h 25m
Multiple Airlines
Deal found 4/3£841
Wed 3/616:00
SAI
-
LGW
1 stop20h 55m
Singapore Airlines
Wed 24/610:15
LGW
-
SAI
1 stop17h 25m
Singapore Airlines
Deal found 4/3£850
Mon 11/510:30
SAI
-
LHR
1 stop35h 15m
Singapore Airlines
Fri 29/520:35
LHR
-
SAI
1 stop36h 35m
Singapore Airlines
Deal found 6/3£865

Find 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 6 March 2026.

Round-trip from

£530

One-way from

£248
China Eastern
  • China Eastern
  • 3/6-24/6
  • 4 total stops
  • 107h 15m total
  • Siem Reap to London
Search Deals
China Eastern
  • China Eastern
  • 26/3
  • 2 total stops
  • 26h 30m total
  • Siem Reap to London
Search Deals

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 6 March 2026.
Use the filters below to find and compare flights from Siem Reap to London that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

Siem ReapLondon

SAI - LGW

SAILGW

Siem Reap–Angkor Intl

Wed 3/6

21:10-06:40

3 stops39h 30m

London Gatwick

Wed 24/6

18:25-20:10

3 stops43h 45m

£542

Siem ReapLondon

SAI - LGW

SAILGW

Siem Reap–Angkor Intl

Mon 11/5

19:30-06:55

2 stops41h 25m

London Gatwick

Fri 29/5

10:40-18:45

2 stops26h 05m

£743

Siem ReapLondon

SAI - LGW

SAILGW

Siem Reap–Angkor Intl

Tue 2/6

23:50-12:35

2 stops18h 45m

London Gatwick

Thu 25/6

10:05-12:15

2 stops20h 10m

£759

Siem ReapLondon

SAI - LHR

SAILHR

Siem Reap–Angkor Intl

Mon 11/5

14:50-06:25

3 stops21h 35m

London Heathrow

Fri 29/5

15:35-09:00

3 stops35h 25m

£767

Siem ReapLondon

SAI - LHR

SAILHR

Siem Reap–Angkor Intl

Tue 2/6

23:50-20:15

2 stops26h 25m

London Heathrow

Thu 25/6

09:05-12:15

2 stops21h 10m

£785

Siem ReapLondon

SAI - LHR

SAILHR

Siem Reap–Angkor Intl

Mon 1/6

12:55-20:15

2 stops37h 20m

London Heathrow

Tue 23/6

20:40-21:30

2 stops42h 50m

£785

Siem ReapLondon

SAI - LHR

SAILHR

Siem Reap–Angkor Intl

Wed 3/6

16:00-15:45

1 stop29h 45m

London Heathrow

Wed 24/6

09:25-09:40

1 stop18h 15m

£837

Siem ReapLondon

SAI - LHR

SAILHR

Siem Reap–Angkor Intl

Mon 1/6

07:20-17:45

2 stops40h 25m

London Heathrow

Tue 23/6

19:50-18:20

1 stop16h 30m

£837
Fastest return journey

Siem ReapLondon

SAI - LGW

SAILGW

Siem Reap–Angkor Intl

Wed 3/6

16:00-06:55

1 stop20h 55m

London Gatwick

Wed 24/6

10:15-09:40

1 stop17h 25m

£850

Siem ReapLondon

SAI - LGW

SAILGW

Siem Reap–Angkor Intl

Mon 11/5

10:30-06:55

1 stop26h 25m

London Gatwick

Fri 29/5

10:15-09:40

1 stop17h 25m

£891

Flights are sorted by cheapest return flights first.

Deals found on 3/3

Showing 1-10 of 34 resultsSorted by cheapest first
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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 18h 45m. China Eastern provides one of the quickest options available for as low as £759. The distance from Siem Reap to London is about 6102 mi. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

  • 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?

Book flights to London if you plan to visit one of these locations
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Croydon
Wembley
Luton
Gatwick
Slough
Hounslow
Ilford
Hayes
Brentford
Colchester
Guildford
Watford
Kingston upon Thames
Eastbourne
Chelmsford
Ipswich
Bedford
Romford
Southend-on-Sea

Browse thousands of different options on Cheapflights for your next trip

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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

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

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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