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Cheap flights from Siem Reap to London from £254

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 3/3. Fares are subject to change and may not be available on all flights or dates of travel.
SAI — LON
12 Mar — 19 Mar1
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 10 February 2026.

Tue 10/222:00
SAI
-
LHR
2 stops26h 30m
China Eastern
Tue 17/221:00
LHR
-
SAI
3 stops41h 00m
China Eastern
Deal found 9/2£626
Sun 21/612:55
SAI
-
LHR
2 stops24h 10m
Emirates
Mon 27/719:50
LHR
-
SAI
2 stops34h 25m
Emirates
Deal found 7/2£809
Tue 10/220:30
SAI
-
LHR
1 stop17h 45m
Multiple Airlines
Tue 17/222:00
LHR
-
SAI
2 stops25h 20m
Multiple Airlines
Deal found 9/2£816
Tue 10/220:30
SAI
-
LHR
1 stop17h 45m
Vietnam Airlines
Tue 17/211:00
LHR
-
SAI
1 stop23h 30m
Vietnam Airlines
Deal found 9/2£851
Tue 10/223:50
SAI
-
LGW
2 stops37h 50m
Emirates
Tue 17/220:25
LGW
-
SAI
2 stops41h 45m
Emirates
Deal found 9/2£922
Tue 10/223:50
SAI
-
LGW
1 stop25h 40m
Multiple Airlines
Tue 17/216:00
LGW
-
SAI
2 stops21h 30m
Multiple Airlines
Deal found 9/2£955
Sun 21/614:55
SAI
-
LHR
3 stops21h 30m
Multiple Airlines
Mon 27/709:30
LHR
-
SAI
2 stops20h 45m
Multiple Airlines
Deal found 7/2£966
Sun 21/616:00
SAI
-
LGW
1 stop20h 55m
Singapore Airlines
Mon 27/710:15
LGW
-
SAI
1 stop17h 25m
Singapore Airlines
Deal found 7/2£971
Sun 21/612:55
SAI
-
LGW
2 stops32h 15m
Multiple Airlines
Mon 27/711:35
LGW
-
SAI
2 stops25h 10m
Multiple Airlines
Deal found 7/2£976
Sun 21/616:00
SAI
-
LHR
1 stop29h 45m
Singapore Airlines
Mon 27/711:20
LHR
-
SAI
1 stop16h 20m
Singapore Airlines
Deal found 7/2£1,044
Mon 2/309:50
SAI
-
LHR
1 stop16h 45m
Multiple Airlines
Mon 2/321:50
LHR
-
SAI
2 stops31h 50m
Multiple Airlines
Deal found 8/2£1,111

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 10 February 2026.

Round-trip from

£809

One-way from

£254
Emirates
  • Emirates
  • 21/6-27/7
  • 4 total stops
  • 58h 35m total
  • Siem Reap to London
Search Deals
China Eastern
  • China Eastern
  • 3/3
  • 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 10 February 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

Sun 21/6

12:55-07:05

2 stops24h 10m

London Heathrow

Mon 27/7

19:50-12:15

2 stops34h 25m

£809

Siem ReapLondon

SAI - LHR

SAILHR

Siem Reap–Angkor Intl

Sun 21/6

14:55-06:25

3 stops21h 30m

London Heathrow

Mon 27/7

09:30-12:15

2 stops20h 45m

£966

Siem ReapLondon

SAI - LGW

SAILGW

Siem Reap–Angkor Intl

Sun 21/6

16:00-06:55

1 stop20h 55m

London Gatwick

Mon 27/7

10:15-09:40

1 stop17h 25m

£971

Siem ReapLondon

SAI - LGW

SAILGW

Siem Reap–Angkor Intl

Sun 21/6

12:55-15:10

2 stops32h 15m

London Gatwick

Mon 27/7

11:35-18:45

2 stops25h 10m

£976

Siem ReapLondon

SAI - LHR

SAILHR

Siem Reap–Angkor Intl

Sun 21/6

16:00-15:45

1 stop29h 45m

London Heathrow

Mon 27/7

11:20-09:40

1 stop16h 20m

£1,044

Siem ReapLondon

SAI - LHR

SAILHR

Siem Reap–Angkor Intl

Mon 2/3

09:50-19:35

1 stop16h 45m

London Heathrow

Mon 2/3

21:50-12:40

2 stops31h 50m

£1,111

Siem ReapLondon

SAI - LHR

SAILHR

Siem Reap–Angkor Intl

Tue 3/3

22:00-17:30

2 stops26h 30m

£254

Siem ReapLondon

SAI - LGW

SAILGW

Siem Reap–Angkor Intl

Tue 3/3

22:00-06:30

3 stops39h 30m

£256

Siem ReapLondon

SAI - LHR

SAILHR

Siem Reap–Angkor Intl

Sat 14/3

22:00-17:30

2 stops26h 30m

£256

Siem ReapLondon

SAI - LGW

SAILGW

Siem Reap–Angkor Intl

Tue 31/3

14:55-01:05

3 stops40h 10m

£282

Flights are sorted by cheapest return flights first.

Deals found on 9/2

Showing 1-10 of 23 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.

  • 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 20h 55m. Fly via Emirates or Singapore Airlines to get the fastest option. The distance between Region of Siem Reap and London is about 6102 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

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

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