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Cheap flights from the United Kingdom to Siem Reap, Cambodia from £271

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 8/3. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SAI
20 Feb — 27 Feb1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from United Kingdom to Siem Reap

Enter your travel dates to find the best prices.

Cheapest flights from United Kingdom to Siem Reap
Explore the most affordable flight options available from United Kingdom to Siem Reap. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 21 January 2026.

Mon 2/308:05
STN
-
SAI
3 stops25h 00m
Multiple Airlines
Tue 24/316:50
SAI
-
STN
3 stops38h 00m
Multiple Airlines
Deal found 20/1£522
Mon 2/306:15
LGW
-
SAI
3 stops25h 45m
Multiple Airlines
Tue 24/322:00
SAI
-
LGW
2 stops39h 30m
Multiple Airlines
Deal found 20/1£572
Mon 2/319:25
LHR
-
SAI
2 stops40h 15m
Multiple Airlines
Tue 24/316:45
SAI
-
LHR
2 stops30h 35m
Multiple Airlines
Deal found 20/1£586
Sun 8/313:35
MAN
-
SAI
3 stops42h 25m
Multiple Airlines
Mon 23/307:20
SAI
-
MAN
2 stops33h 10m
Multiple Airlines
Deal found 18/1£600
Mon 13/406:00
LHR
-
SAI
2 stops30h 45m
Multiple Airlines
Sun 26/416:00
SAI
-
LHR
2 stops22h 15m
Multiple Airlines
Deal found 19/1£611
Sun 15/321:25
LHR
-
SAI
1 stop29h 35m
Malaysia Airlines
Tue 31/311:00
SAI
-
LHR
1 stop35h 35m
Malaysia Airlines
Deal found 19/1£615
Thu 9/421:35
LHR
-
SAI
1 stop30h 25m
Malaysia Airlines
Tue 28/411:00
SAI
-
LHR
1 stop35h 35m
Malaysia Airlines
Deal found 19/1£617
Tue 17/221:25
LHR
-
SAI
1 stop29h 35m
Multiple Airlines
Fri 3/421:10
SAI
-
LHR
2 stops27h 30m
Multiple Airlines
Deal found 20/1£618
Tue 7/421:35
LHR
-
SAI
1 stop30h 25m
Malaysia Airlines
Tue 28/411:00
SAI
-
LHR
1 stop35h 35m
Malaysia Airlines
Deal found 19/1£627
Mon 23/208:50
LHR
-
SAI
2 stops19h 00m
Multiple Airlines
Mon 23/321:40
SAI
-
LHR
2 stops40h 00m
Multiple Airlines
Deal found 19/1£631
Sun 15/313:55
LHR
-
SAI
2 stops37h 55m
Multiple Airlines
Sun 22/321:40
SAI
-
LHR
2 stops40h 00m
Multiple Airlines
Deal found 20/1£633
Mon 23/1118:45
MAN
-
SAI
2 stops32h 05m
SWISS
Fri 4/1216:45
SAI
-
MAN
2 stops22h 35m
SWISS
Deal found 20/1£636

Find flight deals from United Kingdom to Siem Reap

Keep the following information in mind while searching for United Kingdom to Siem Reap flight deals. Data was last updated 21 January 2026.

Round-trip from

£522

One-way from

£271

Popular in

December

Cheapest in

September

Average price

£729
2/3-24/3
  • 2/3-24/3
  • 6 total stops
  • 63h 00m total
  • United Kingdom to Siem Reap
Search Deals
8/3
  • 8/3
  • 2 total stops
  • 41h 45m total
  • United Kingdom to Siem Reap
Search Deals
Highest demand for flights based on searches. 7% potential increase in price (£52 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (£24 potential savings vs. average return price).
Search Deals
Average for round-trip flights in January 2026
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from United Kingdom to Siem Reap 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 21 January 2026.
Use the filters below to find and compare flights from the United Kingdom to Siem Reap that are best for you.

Fly from

United Kingdom

Fly to

Siem Reap

Route

Depart

Return

Price

LondonSiem Reap

STN - SAI

STNSAI

London Stansted

Mon 2/3

08:05-16:05

3 stops25h 00m

Siem Reap–Angkor Intl

Tue 24/3

16:50-23:50

3 stops38h 00m

£522

LondonSiem Reap

LGW - SAI

LGWSAI

London Gatwick

Mon 2/3

06:15-15:00

3 stops25h 45m

Siem Reap–Angkor Intl

Tue 24/3

22:00-06:30

3 stops39h 30m

£572

LondonSiem Reap

LHR - SAI

LHRSAI

London Heathrow

Tue 17/2

21:25-10:00

1 stop29h 35m

Siem Reap–Angkor Intl

Fri 3/4

21:10-18:40

2 stops27h 30m

£618

LondonSiem Reap

LHR - SAI

LHRSAI

London Heathrow

Mon 2/3

06:00-15:00

3 stops26h 00m

Siem Reap–Angkor Intl

Tue 24/3

11:45-16:20

2 stops35h 35m

£639

LondonSiem Reap

LGW - SAI

LGWSAI

London Gatwick

Mon 2/3

10:30-21:00

3 stops27h 30m

Siem Reap–Angkor Intl

Tue 24/3

22:00-06:30

2 stops39h 30m

£639

LondonSiem Reap

LGW - SAI

LGWSAI

London Gatwick

Sat 21/3

18:40-18:45

2 stops41h 05m

Siem Reap–Angkor Intl

Sat 28/3

22:00-05:40

2 stops38h 40m

£642

ManchesterSiem Reap

MAN - SAI

MANSAI

Manchester

Sun 8/3

13:35-15:00

3 stops42h 25m

Siem Reap–Angkor Intl

Mon 23/3

07:20-09:30

3 stops33h 10m

£643

LondonSiem Reap

LGW - SAI

LGWSAI

London Gatwick

Tue 17/3

10:30-21:00

2 stops51h 30m

Siem Reap–Angkor Intl

Mon 30/3

21:10-15:00

2 stops47h 50m

£663

ManchesterSiem Reap

MAN - SAI

MANSAI

Manchester

Sun 22/2

19:55-10:50

2 stops31h 55m

Siem Reap–Angkor Intl

Mon 9/3

19:45-06:10

2 stops41h 25m

£668

LondonSiem Reap

LGW - SAI

LGWSAI

London Gatwick

Mon 2/3

09:25-15:55

1 stop23h 30m

Siem Reap–Angkor Intl

Tue 24/3

10:45-06:25

1 stop26h 40m

£672

Flights are sorted by cheapest return flights first.

Deals found on 18/1

Showing 1-10 of 60 results
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Best time to book a flight from United Kingdom to Siem Reap

Have a flexible travel schedule? Discover the best time to fly to Siem Reap from United Kingdom 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 the United Kingdom to Siem Reap

What is the cheapest month to book a flight from United Kingdom to Siem Reap?

Currently, March is the cheapest month in which you can book a flight from United Kingdom to Siem Reap (average of £583). Flying from United Kingdom to Siem Reap in August is currently the most expensive (average of £893). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

Reviews of airlines servicing Siem Reap

Get insights into the airlines that provide service to Siem Reap. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Siem Reap. Reviews last updated 21 January 2026.
Read through reviews of airlines operating flights from the United Kingdom to Siem Reap, such as Emirates, Singapore Airlines, andThai Airways. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Emirates
8.1
Very Good
3,484 reviews
Check prices

Overall

8.1

Crew

8.3

Food

7.9

Entertainment

8.2

Boarding

8.1

Comfort

8.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

DXB - MAN

A380 is best airplane in the world for long haul flights. And Emirates one of the top airlines.
Emirates
8.1
Very Good
3,484 reviews
Emirates
8.1
Very Good
3,484 reviews
Check prices

Overall

8.1

Crew

8.3

Food

7.9

Entertainment

8.2

Boarding

8.1

Comfort

8.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

DXB - MAN

A380 is best airplane in the world for long haul flights. And Emirates one of the top airlines.
Singapore Airlines
8.1
Very Good
1,433 reviews
Emirates
8.1
Very Good
3,484 reviews
Check prices

Overall

8.1

Crew

8.3

Food

7.9

Entertainment

8.2

Boarding

8.1

Comfort

8.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

DXB - MAN

A380 is best airplane in the world for long haul flights. And Emirates one of the top airlines.
Thai Airways
7.8
Good
379 reviews
Emirates
8.1
Very Good
3,484 reviews
Check prices

Overall

8.1

Crew

8.3

Food

7.9

Entertainment

8.2

Boarding

8.1

Comfort

8.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

DXB - MAN

A380 is best airplane in the world for long haul flights. And Emirates one of the top airlines.
Vietnam Airlines
7.6
Good
220 reviews
Emirates
8.1
Very Good
3,484 reviews
Check prices

Overall

8.1

Crew

8.3

Food

7.9

Entertainment

8.2

Boarding

8.1

Comfort

8.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

DXB - MAN

A380 is best airplane in the world for long haul flights. And Emirates one of the top airlines.
British Airways
6.7
Okay
7,690 reviews
Emirates
8.1
Very Good
3,484 reviews
Check prices

Overall

8.1

Crew

8.3

Food

7.9

Entertainment

8.2

Boarding

8.1

Comfort

8.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

DXB - MAN

A380 is best airplane in the world for long haul flights. And Emirates one of the top airlines.

Related info for your journey

Find useful and relevant information for your journey from United Kingdom to Siem Reap. 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 into for flights to Siem Reap from United Kingdom?

    Siem Reap–Angkor Intl (SAI) is the airport you will fly into if you book a flight from United Kingdom to Siem Reap. It is only a 24.7 mi journey from Siem Reap–Angkor Intl (SAI) to Siem Reap’s city center.

  • How long is the flight from United Kingdom to Siem Reap?

    A quick flight from United Kingdom to Siem Reap can take about 24h 05m. China Eastern provides one of the quickest options available for as low as £702. United Kingdom and Siem Reap are separated by a distance of 6068 mi. Both multi-stop and direct flights can be found to your destination and back.

  • What are the cheapest airlines to fly from United Kingdom to Siem Reap one-way?

    One-way options have recently been found by users for as low as £421 on Vietnam Airlines. Other airlines that offer cheap prices include Singapore Airlines from £482 and Thai Airways from £537 one-way.

  • What are the most popular routes from United Kingdom to Siem Reap?

    Most travelers choose London Heathrow - Siem Reap–Angkor Intl, London City - Siem Reap–Angkor Intl or London Gatwick - Siem Reap–Angkor Intl when deciding on the best route from United Kingdom to Siem Reap.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from United Kingdom to Siem Reap by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from United Kingdom to Siem Reap?

    Currently, March is the cheapest month in which you can book a flight from United Kingdom to Siem Reap (average of £583). Flying from United Kingdom to Siem Reap in August is currently the most expensive (average of £893). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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.

Top 6 airlines flying from United Kingdom to Siem Reap

Discover the top 6 airlines that operate flights from United Kingdom to Siem Reap. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 21 January 2026.
AirlineCheapestAverageFlexibilityOn-time
Austrian AirlinesCheapest£539Average£689FlexibilityNo cancel feeOn-time78%
Search Austrian Airlines flights
Vietnam AirlinesCheapest£615Average£717FlexibilityNo cancel feeOn-time81%
Search Vietnam Airlines flights
Singapore AirlinesCheapest£668Average£884FlexibilityNo cancel feeOn-time81%
Search Singapore Airlines flights
LufthansaCheapest£732Average£767FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
Thai AirwaysCheapest£858Average£946FlexibilityNo cancel feeOn-time77%
Search Thai Airways flights
EmiratesCheapest£895Average£967FlexibilityNo cancel feeOn-time75%
Search Emirates 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 United Kingdom to Siem Reap?

Cheapflights helps you search for flights from United Kingdom to Siem Reap 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 United Kingdom to Siem Reap?

By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to Siem Reap from United Kingdom.

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

Yes! Cheapflights helps users easily find flights from United Kingdom to Siem Reap with no change fees.

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

Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and provide a valid email address to enable Price Alerts. That’s it!

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