Find flights
When to book
FAQs

Cheap flights from Siem Reap to London from £288

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 14/11. Fares are subject to change and may not be available on all flights or dates of travel.
SAI — LON
26 Jul — 2 Aug1
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 26 June 2026.

Sat 5/1222:00
SAI
-
LGW
2 stops39h 30m
China Eastern
Wed 30/1210:30
LGW
-
SAI
3 stops27h 30m
China Eastern
Deal found 22/6£653
Sat 5/1222:00
SAI
-
LHR
3 stops50h 30m
China Eastern
Tue 29/1221:00
LHR
-
SAI
3 stops41h 00m
China Eastern
Deal found 22/6£706
Sat 5/1222:00
SAI
-
LGW
2 stops39h 30m
China Eastern
Thu 31/1210:30
LGW
-
SAI
2 stops51h 30m
China Eastern
Deal found 22/6£715
Wed 2/921:10
SAI
-
LGW
2 stops28h 00m
China Eastern
Fri 1/110:30
LGW
-
SAI
3 stops27h 30m
China Eastern
Deal found 22/6£736
Sat 5/1222:00
SAI
-
LHR
2 stops50h 30m
China Eastern
Thu 31/1221:00
LHR
-
SAI
3 stops41h 00m
China Eastern
Deal found 22/6£744
Sat 5/1222:00
SAI
-
LGW
3 stops39h 30m
China Eastern
Tue 29/1210:30
LGW
-
SAI
2 stops51h 30m
China Eastern
Deal found 22/6£757
Sat 5/1222:00
SAI
-
LGW
3 stops39h 30m
China Eastern
Sun 27/1217:00
LGW
-
SAI
3 stops45h 00m
China Eastern
Deal found 22/6£795
Sat 5/1219:25
SAI
-
LHR
2 stops24h 10m
Finnair
Fri 1/107:30
LHR
-
SAI
2 stops22h 10m
Finnair
Deal found 22/6£812
Sat 5/1219:25
SAI
-
LHR
2 stops24h 10m
Finnair
Wed 30/1216:15
LHR
-
SAI
2 stops37h 25m
Finnair
Deal found 22/6£814
Thu 16/719:35
SAI
-
LHR
2 stops31h 05m
Multiple Airlines
Tue 28/716:10
LHR
-
SAI
2 stops34h 50m
Multiple Airlines
Deal found 26/6£832
Wed 2/919:35
SAI
-
LHR
2 stops31h 05m
Multiple Airlines
Fri 1/107:30
LHR
-
SAI
2 stops22h 10m
Multiple Airlines
Deal found 22/6£833
Sat 5/1219:25
SAI
-
LHR
2 stops20h 45m
Finnair
Sun 27/1210:20
LHR
-
SAI
2 stops19h 20m
Finnair
Deal found 22/6£842

Find flight deals from Siem Reap to London

Keep the following information in mind while searching for Siem Reap to London flight deals. Data was last updated 26 June 2026.

Round-trip from

£653

One-way from

£288
China Eastern
  • China Eastern
  • 5/12-30/12
  • 5 total stops
  • 67h 00m total
  • Siem Reap to London
Search Deals
14/11
  • 14/11
  • 2 total stops
  • 46h 45m 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 26 June 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 - LHR

SAILHR

Siem Reap–Angkor Intl

Sat 5/12

22:00-17:30

2 stops50h 30m

London Heathrow

Tue 29/12

21:00-21:00

2 stops41h 00m

£706

Siem ReapLondon

SAI - LHR

SAILHR

Siem Reap–Angkor Intl

Sat 5/12

22:00-17:30

2 stops50h 30m

London Heathrow

Thu 31/12

21:00-21:00

2 stops41h 00m

£744

Siem ReapLondon

SAI - LGW

SAILGW

Siem Reap–Angkor Intl

Sat 5/12

22:00-06:30

3 stops39h 30m

London Gatwick

Mon 28/12

10:30-21:00

3 stops27h 30m

£757

Siem ReapLondon

SAI - LGW

SAILGW

Siem Reap–Angkor Intl

Sat 5/12

22:00-06:30

3 stops39h 30m

London Gatwick

Tue 29/12

10:30-21:00

2 stops51h 30m

£757

Siem ReapLondon

SAI - LGW

SAILGW

Siem Reap–Angkor Intl

Sat 5/12

22:00-06:30

2 stops39h 30m

London Gatwick

Sun 27/12

17:00-21:00

3 stops45h 00m

£795

Siem ReapLondon

SAI - LHR

SAILHR

Siem Reap–Angkor Intl

Sat 5/12

19:25-12:35

2 stops24h 10m

London Heathrow

Wed 30/12

16:15-12:40

2 stops37h 25m

£814

Siem ReapLondon

SAI - LHR

SAILHR

Siem Reap–Angkor Intl

Thu 16/7

19:35-20:40

2 stops31h 05m

London Heathrow

Tue 28/7

16:10-09:00

2 stops34h 50m

£832
Fastest return journey

Siem ReapLondon

SAI - LHR

SAILHR

Siem Reap–Angkor Intl

Sat 5/12

19:25-09:10

2 stops20h 45m

London Heathrow

Sun 27/12

10:20-12:40

2 stops19h 20m

£842

Siem ReapLondon

SAI - LHR

SAILHR

Siem Reap–Angkor Intl

Sat 5/12

19:25-15:15

2 stops26h 50m

London Heathrow

Sat 26/12

16:15-12:40

2 stops37h 25m

£844

Siem ReapLondon

SAI - LGW

SAILGW

Siem Reap–Angkor Intl

Thu 16/7

23:50-19:45

2 stops25h 55m

London Gatwick

Tue 28/7

21:45-21:30

2 stops41h 45m

£870

Flights are sorted by cheapest return flights first.

Deals found on 26/6

Showing 1-10 of 34 resultsSorted by cheapest first
1
2
3
4

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.

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

    There are many flights that can get you from Region of Siem Reap to London in 24h 10m. Fly via China Eastern or Finnair to get the fastest option. The distance between Region of Siem Reap and London is about 6106 mi. Both multi-stop and direct flights can be found to your destination and back.

  • 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
Hounslow
Milton Keynes
Wembley
Luton
Gatwick
Croydon
Ilford
Slough
Hayes
Brentford
Colchester
Kingston upon Thames
Eastbourne
Watford
Southall
Romford
Ipswich
Borehamwood
Folkestone
Southend-on-Sea

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.

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?

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.

100% Free

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

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

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.