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Cheap flights from Siem Reap to London Heathrow Airport 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 — LHR
4 Apr — 11 Apr1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Siem Reap to Heathrow

Enter your travel dates to find the best prices.

Cheapest flights from Siem Reap to Heathrow
Explore the most affordable flight options available from Siem Reap to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 5 March 2026.

Wed 3/621:10
SAI
-
LHR
2 stops27h 30m
China Eastern
Wed 24/621:20
LHR
-
SAI
3 stops40h 50m
China Eastern
Deal found 4/3£545
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£730
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£767
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
Sat 13/623:50
SAI
-
LHR
2 stops24h 50m
Emirates
Tue 30/609:05
LHR
-
SAI
2 stops21h 10m
Emirates
Deal found 1/3£786
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
Sun 14/618:05
SAI
-
LHR
1 stop29h 00m
Vietnam Airlines
Tue 30/619:50
LHR
-
SAI
1 stop16h 20m
Vietnam Airlines
Deal found 1/3£843
Sat 13/619:05
SAI
-
LHR
2 stops29h 35m
Multiple Airlines
Tue 30/619:50
LHR
-
SAI
1 stop16h 20m
Multiple Airlines
Deal found 1/3£863
Mon 1/610:30
SAI
-
LHR
1 stop35h 15m
Singapore Airlines
Tue 23/611:20
LHR
-
SAI
1 stop16h 20m
Singapore Airlines
Deal found 4/3£875

Find flight deals from Siem Reap to Heathrow

Keep the following information in mind while searching for Siem Reap to Heathrow flight deals. Data was last updated 5 March 2026.

Round-trip from

£545

One-way from

£248
China Eastern
  • China Eastern
  • 3/6-24/6
  • 4 total stops
  • 68h 20m 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 Heathrow 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 5 March 2026.
Use the filters below to find and compare flights from Siem Reap to London Heathrow Airport 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

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

Sun 14/6

12:55-07:05

2 stops24h 10m

London Heathrow

Tue 30/6

09:05-12:15

2 stops21h 10m

£786

Siem ReapLondon

SAI - LHR

SAILHR

Siem Reap–Angkor Intl

Sat 13/6

23:50-18:40

2 stops24h 50m

London Heathrow

Tue 30/6

09:05-12:15

2 stops21h 10m

£786

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

£836

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

£836

Siem ReapLondon

SAI - LHR

SAILHR

Siem Reap–Angkor Intl

Sun 14/6

18:05-17:05

1 stop29h 00m

London Heathrow

Tue 30/6

19:50-18:10

1 stop16h 20m

£843

Siem ReapLondon

SAI - LHR

SAILHR

Siem Reap–Angkor Intl

Mon 15/6

19:10-17:50

1 stop28h 40m

London Heathrow

Tue 30/6

19:50-18:10

1 stop16h 20m

£887

Siem ReapLondon

SAI - LHR

SAILHR

Siem Reap–Angkor Intl

Sat 13/6

18:05-17:50

1 stop29h 45m

London Heathrow

Tue 30/6

19:50-18:10

1 stop16h 20m

£887

Siem ReapLondon

SAI - LHR

SAILHR

Siem Reap–Angkor Intl

Tue 2/6

18:05-16:55

1 stop28h 50m

London Heathrow

Thu 25/6

18:55-21:05

1 stop20h 10m

£899

Flights are sorted by cheapest return flights first.

Deals found on 4/3

Showing 1-10 of 21 resultsSorted by cheapest first
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Best time to book a flight from Siem Reap to Heathrow

Have a flexible travel schedule? Discover the best time to fly to Heathrow 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 Heathrow Airport
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 Heathrow. 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 Heathrow Airport?

    Emirates can get you from Region of Siem Reap to London Heathrow Airport in just under 26h 25m. Your travel time can differ by up to . The distance from Region of Siem Reap to London Heathrow Airport is about 6106 mi.

  • Can I find deals for flights from Siem Reap to Heathrow that include hotel bookings?

    Yes. In addition to deals on Siem Reap to Heathrow flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Siem Reap to Heathrow?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Siem Reap to Heathrow.

  • Can I find deals for business class flights from Siem Reap to Heathrow?

    Yes. Cheapflights offers flight deals from Siem Reap to Heathrow 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 Heathrow Airport?

Book flights to London Heathrow Airport if you plan to visit one of these locations
Milton Keynes
Croydon
Wembley
Northampton
Luton
Gatwick
Slough
Hounslow
Ilford
Hayes
Brentford
Colchester
Guildford
Watford
Kingston upon Thames
Eastbourne
Chelmsford
Ipswich
Swindon
Bedford

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Siem Reap to Heathrow

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
Phnom Penh to Gatwick flights
Phnom Penh 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 Heathrow?

Cheapflights makes it easy to find Siem Reap to Heathrow flights by helping our users search from 900+ travel sites for deals. We also provide you with filters for cabin, price, airline, airports, number of stops, and many more to narrow down that perfect flight.

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

Millions of users choose and trust Cheapflights to book the best flight deals from Siem Reap to Heathrow for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

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

Cheapflights does show flights with no change fees to all users. To see these options for flights from Siem Reap to Heathrow, users can toggle the no change fees filter when performing a flight search.

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

Yes, Cheapflights offers price alerts on Siem Reap to Heathrow flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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