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Cheap flights from Siem Reap to London from £314

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 26/4. Fares are subject to change and may not be available on all flights or dates of travel.
SAI — LON
21 Apr — 28 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 22 March 2026.

Mon 25/509:45
SAI
-
LHR
2 stops35h 35m
Multiple Airlines
Tue 23/622:05
LHR
-
SAI
2 stops38h 40m
Multiple Airlines
Deal found 18/3£705
Mon 25/513:05
SAI
-
LGW
2 stops38h 25m
Emirates
Tue 23/621:45
LGW
-
SAI
2 stops41h 45m
Emirates
Deal found 18/3£738
Mon 25/514:50
SAI
-
LGW
3 stops21h 50m
Multiple Airlines
Tue 23/614:55
LGW
-
SAI
2 stops21h 50m
Multiple Airlines
Deal found 18/3£867
Mon 25/510:30
SAI
-
LGW
1 stop26h 25m
Singapore Airlines
Tue 23/610:05
LGW
-
SAI
1 stop23h 05m
Singapore Airlines
Deal found 18/3£1,202
Thu 23/419:10
SAI
-
LHR
2 stops29h 35m
Multiple Airlines
Thu 7/509:30
LHR
-
SAI
2 stops19h 20m
Multiple Airlines
Deal found 18/3£1,892
Fri 24/421:10
SAI
-
LGW
2 stops47h 50m
China Eastern
Mon 4/511:35
LGW
-
SAI
2 stops50h 35m
China Eastern
Deal found 18/3£2,278
Thu 23/419:30
SAI
-
LGW
2 stops23h 55m
Multiple Airlines
Thu 7/509:00
LGW
-
SAI
2 stops27h 45m
Multiple Airlines
Deal found 18/3£2,279
Tue 21/419:30
SAI
-
LGW
2 stops23h 55m
Qatar Airways
Fri 8/509:00
LGW
-
SAI
2 stops27h 45m
Qatar Airways
Deal found 18/3£2,318
Fri 24/419:30
SAI
-
LGW
2 stops41h 10m
Qatar Airways
Fri 8/514:55
LGW
-
SAI
2 stops36h 10m
Qatar Airways
Deal found 18/3£2,319
Sat 25/413:05
SAI
-
LHR
2 stops24h 25m
Qatar Airways
Sun 10/515:35
LHR
-
SAI
2 stops21h 10m
Qatar Airways
Deal found 18/3£2,354
Mon 20/413:05
SAI
-
LGW
2 stops24h 15m
Emirates
Thu 7/523:55
LGW
-
SAI
2 stops39h 35m
Emirates
Deal found 18/3£2,572
Mon 20/413:05
SAI
-
LGW
2 stops24h 15m
Emirates
Sun 10/523:55
LGW
-
SAI
2 stops39h 35m
Emirates
Deal found 18/3£2,573

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 22 March 2026.

Round-trip from

£705

One-way from

£314
25/5-23/6
  • 25/5-23/6
  • 4 total stops
  • 74h 15m total
  • Siem Reap to London
Search Deals
26/4
  • 26/4
  • 2 total stops
  • 23h 50m 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 22 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 - LHR

SAILHR

Siem Reap–Angkor Intl

Mon 25/5

09:45-15:20

2 stops35h 35m

London Heathrow

Tue 23/6

22:05-18:45

2 stops38h 40m

£705

Siem ReapLondon

SAI - LGW

SAILGW

Siem Reap–Angkor Intl

Mon 25/5

13:05-21:30

2 stops38h 25m

London Gatwick

Tue 23/6

21:45-21:30

2 stops41h 45m

£738
Fastest return journey

Siem ReapLondon

SAI - LGW

SAILGW

Siem Reap–Angkor Intl

Mon 25/5

14:50-06:40

3 stops21h 50m

London Gatwick

Tue 23/6

14:55-18:45

2 stops21h 50m

£867

Siem ReapLondon

SAI - LGW

SAILGW

Siem Reap–Angkor Intl

Fri 24/4

21:10-15:00

3 stops47h 50m

London Gatwick

Tue 5/5

11:35-20:10

3 stops26h 35m

£2,278

Siem ReapLondon

SAI - LGW

SAILGW

Siem Reap–Angkor Intl

Tue 21/4

19:30-13:25

2 stops23h 55m

London Gatwick

Sat 9/5

09:00-18:45

2 stops27h 45m

£2,318

Siem ReapLondon

SAI - LGW

SAILGW

Siem Reap–Angkor Intl

Thu 23/4

19:30-13:25

2 stops23h 55m

London Gatwick

Mon 4/5

09:00-18:45

2 stops27h 45m

£2,318

Siem ReapLondon

SAI - LGW

SAILGW

Siem Reap–Angkor Intl

Tue 21/4

19:30-13:25

2 stops23h 55m

London Gatwick

Fri 8/5

09:00-18:45

2 stops27h 45m

£2,318

Siem ReapLondon

SAI - LGW

SAILGW

Siem Reap–Angkor Intl

Mon 20/4

13:05-07:20

2 stops24h 15m

London Gatwick

Tue 5/5

23:55-21:30

2 stops39h 35m

£2,572

Siem ReapLondon

SAI - LGW

SAILGW

Siem Reap–Angkor Intl

Wed 22/4

13:05-07:20

2 stops24h 15m

London Gatwick

Thu 7/5

23:55-21:30

2 stops39h 35m

£2,572

Siem ReapLondon

SAI - LHR

SAILHR

Siem Reap–Angkor Intl

Mon 20/4

19:10-17:50

1 stop28h 40m

London Heathrow

Tue 5/5

19:50-18:20

1 stop16h 30m

£3,787

Flights are sorted by cheapest return flights first.

Deals found on 22/3

Showing 1-10 of 32 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.

  • 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 23h 55m. Fly via Emirates, China Eastern, or Qatar Airways 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

Travelling to a place near London?

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

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