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Cheap flights from the United Kingdom to Siem Reap, Cambodia from £372

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 30/8. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SAI
2 Jul — 9 Jul1
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 2 June 2026.

Fri 26/620:45
MAN
-
SAI
2 stops39h 05m
Etihad Airways
Sun 5/719:20
SAI
-
MAN
2 stops29h 15m
Etihad Airways
Deal found 29/5£547
Sun 14/609:20
MAN
-
SAI
2 stops19h 55m
Etihad Airways
Sun 28/613:00
SAI
-
MAN
2 stops47h 55m
Etihad Airways
Deal found 29/5£561
Fri 26/620:45
MAN
-
SAI
2 stops30h 15m
Etihad Airways
Sat 11/715:10
SAI
-
MAN
2 stops21h 45m
Etihad Airways
Deal found 31/5£576
Wed 24/621:45
LHR
-
SAI
2 stops31h 30m
Etihad Airways
Fri 26/619:20
SAI
-
LHR
2 stops29h 25m
Etihad Airways
Deal found 28/5£599
Fri 25/906:00
LHR
-
SAI
2 stops30h 55m
Austrian Airlines
Tue 29/912:55
SAI
-
LHR
2 stops25h 25m
Austrian Airlines
Deal found 1/6£612
Fri 3/709:30
LHR
-
SAI
2 stops19h 45m
Etihad Airways
Fri 10/715:10
SAI
-
LHR
2 stops33h 35m
Etihad Airways
Deal found 1/6£615
Thu 29/1010:30
LGW
-
SAI
2 stops51h 30m
China Eastern
Sat 7/1122:00
SAI
-
LGW
2 stops47h 00m
China Eastern
Deal found 29/5£618
Wed 29/720:45
LHR
-
SAI
2 stops32h 30m
Etihad Airways
Sat 15/815:10
SAI
-
LHR
2 stops33h 35m
Etihad Airways
Deal found 29/5£643
Mon 22/620:45
LHR
-
SAI
2 stops32h 30m
Etihad Airways
Thu 25/615:10
SAI
-
LHR
2 stops33h 35m
Etihad Airways
Deal found 28/5£644
Wed 29/714:45
LHR
-
SAI
2 stops38h 30m
Etihad Airways
Tue 18/815:10
SAI
-
LHR
2 stops33h 35m
Etihad Airways
Deal found 29/5£655
Thu 29/1010:30
LGW
-
SAI
2 stops51h 30m
China Eastern
Thu 5/1122:00
SAI
-
LGW
3 stops47h 00m
China Eastern
Deal found 29/5£667
Mon 29/620:45
MAN
-
SAI
2 stops32h 30m
Etihad Airways
Mon 6/719:35
SAI
-
MAN
2 stops41h 20m
Etihad Airways
Deal found 30/5£669

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 2 June 2026.

Round-trip from

£547

One-way from

£372

Popular in

December

Cheapest in

September

Average price

£846
Etihad Airways
  • Etihad Airways
  • 26/6-5/7
  • 4 total stops
  • 68h 20m total
  • United Kingdom to Siem Reap
Search Deals
30/8
  • 30/8
  • 3 total stops
  • 37h 10m total
  • United Kingdom to Siem Reap
Search Deals
Highest demand for flights based on searches. 7% potential increase in price (£49 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 June 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 2 June 2026.
Use the filters below to find and compare flights from the United Kingdom to Siem Reap that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

ManchesterSiem Reap

MAN - SAI

MANSAI

Manchester

Sun 14/6

09:20-11:15

2 stops19h 55m

Siem Reap–Angkor Intl

Sun 28/6

13:00-06:55

2 stops47h 55m

£561

LondonSiem Reap

LHR - SAI

LHRSAI

London Heathrow

Mon 22/6

20:45-11:15

2 stops32h 30m

Siem Reap–Angkor Intl

Thu 25/6

15:10-18:45

2 stops33h 35m

£644

LondonSiem Reap

LHR - SAI

LHRSAI

London Heathrow

Wed 29/7

20:45-11:15

2 stops32h 30m

Siem Reap–Angkor Intl

Tue 18/8

19:20-18:45

2 stops29h 25m

£658

LondonSiem Reap

LHR - SAI

LHRSAI

London Heathrow

Tue 10/11

21:00-21:00

3 stops41h 00m

Siem Reap–Angkor Intl

Sat 5/12

22:00-17:30

3 stops50h 30m

£698

LondonSiem Reap

STN - SAI

STNSAI

London Stansted

Thu 29/10

20:15-21:10

2 stops41h 55m

Siem Reap–Angkor Intl

Tue 17/11

23:50-17:55

2 stops25h 05m

£728

LondonSiem Reap

STN - SAI

STNSAI

London Stansted

Sun 1/11

20:15-21:10

2 stops41h 55m

Siem Reap–Angkor Intl

Tue 17/11

23:50-17:55

2 stops25h 05m

£728

LondonSiem Reap

LGW - SAI

LGWSAI

London Gatwick

Fri 30/10

13:35-21:10

2 stops24h 35m

Siem Reap–Angkor Intl

Tue 17/11

23:50-18:25

2 stops25h 35m

£754

LondonSiem Reap

STN - SAI

STNSAI

London Stansted

Mon 2/11

14:05-21:10

2 stops24h 05m

Siem Reap–Angkor Intl

Sat 14/11

23:50-17:55

2 stops25h 05m

£759

LondonSiem Reap

STN - SAI

STNSAI

London Stansted

Mon 2/11

14:05-21:10

2 stops24h 05m

Siem Reap–Angkor Intl

Wed 18/11

13:20-12:05

2 stops29h 45m

£765

LondonSiem Reap

LCY - SAI

LCYSAI

London City

Fri 21/8

13:10-18:55

2 stops23h 45m

Siem Reap–Angkor Intl

Thu 3/9

10:30-08:40

2 stops28h 10m

£766

Flights are sorted by cheapest return flights first.

Deals found on 29/5

Showing 1-10 of 60 resultsSorted by cheapest first
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6

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, May is the cheapest month in which you can book a flight from United Kingdom to Siem Reap (average of £528). Flying from United Kingdom to Siem Reap in July is currently the most expensive (average of £910). 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 2 June 2026.
Read through reviews of airlines operating flights from the United Kingdom to Siem Reap, such as Singapore Airlines,Emirates, andThai Airways. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Singapore Airlines
8.2
Very Good
1,527 reviews
Check prices

Crew

8.6

Entertainment

8.1

Boarding

8.3

Food

7.8

Overall

8.2

Comfort

8.0

Reviews

1 / 20
6.0
Good

Anonymous,Feb 2026

SAI - SIN

The only issue we had was seat selection. Was not easy to change, after they assigned seats. Also, the premium economy seats, are nothing special.. All and all safe flight with minor back issues.
Singapore Airlines
8.2
Very Good
1,527 reviews
Singapore Airlines
8.2
Very Good
1,527 reviews
Check prices

Crew

8.6

Entertainment

8.1

Boarding

8.3

Food

7.8

Overall

8.2

Comfort

8.0

Reviews

1 / 20
6.0
Good

Anonymous,Feb 2026

SAI - SIN

The only issue we had was seat selection. Was not easy to change, after they assigned seats. Also, the premium economy seats, are nothing special.. All and all safe flight with minor back issues.
Emirates
8.1
Very Good
3,577 reviews
Singapore Airlines
8.2
Very Good
1,527 reviews
Check prices

Crew

8.6

Entertainment

8.1

Boarding

8.3

Food

7.8

Overall

8.2

Comfort

8.0

Reviews

1 / 20
6.0
Good

Anonymous,Feb 2026

SAI - SIN

The only issue we had was seat selection. Was not easy to change, after they assigned seats. Also, the premium economy seats, are nothing special.. All and all safe flight with minor back issues.
Thai Airways
7.9
Good
404 reviews
Singapore Airlines
8.2
Very Good
1,527 reviews
Check prices

Crew

8.6

Entertainment

8.1

Boarding

8.3

Food

7.8

Overall

8.2

Comfort

8.0

Reviews

1 / 20
6.0
Good

Anonymous,Feb 2026

SAI - SIN

The only issue we had was seat selection. Was not easy to change, after they assigned seats. Also, the premium economy seats, are nothing special.. All and all safe flight with minor back issues.
Vietnam Airlines
7.7
Good
271 reviews
Singapore Airlines
8.2
Very Good
1,527 reviews
Check prices

Crew

8.6

Entertainment

8.1

Boarding

8.3

Food

7.8

Overall

8.2

Comfort

8.0

Reviews

1 / 20
6.0
Good

Anonymous,Feb 2026

SAI - SIN

The only issue we had was seat selection. Was not easy to change, after they assigned seats. Also, the premium economy seats, are nothing special.. All and all safe flight with minor back issues.
British Airways
6.7
Okay
8,015 reviews
Singapore Airlines
8.2
Very Good
1,527 reviews
Check prices

Crew

8.6

Entertainment

8.1

Boarding

8.3

Food

7.8

Overall

8.2

Comfort

8.0

Reviews

1 / 20
6.0
Good

Anonymous,Feb 2026

SAI - SIN

The only issue we had was seat selection. Was not easy to change, after they assigned seats. Also, the premium economy seats, are nothing special.. All and all safe flight with minor back issues.

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 19h 55m. Etihad Airways provides one of the quickest options available for as low as £561. United Kingdom and Siem Reap are separated by a distance of 6132 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 Emirates from £439 and Singapore Airlines from £481 one-way.

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

    Most travelers choose London Heathrow - Siem Reap–Angkor Intl, London Gatwick - Siem Reap–Angkor Intl or London Stansted - 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, May is the cheapest month in which you can book a flight from United Kingdom to Siem Reap (average of £528). Flying from United Kingdom to Siem Reap in July is currently the most expensive (average of £910). 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 2 June 2026.
AirlineCheapestAverageFlexibilityOn-time
Austrian AirlinesCheapest£538Average£684FlexibilityNo cancel feeOn-time78%
Search Austrian Airlines flights
LufthansaCheapest£597Average£767FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
Vietnam AirlinesCheapest£618Average£814FlexibilityNo cancel feeOn-time81%
Search Vietnam Airlines flights
Singapore AirlinesCheapest£663Average£905FlexibilityNo cancel feeOn-time81%
Search Singapore Airlines flights
EmiratesCheapest£851Average£939FlexibilityNo cancel feeOn-time75%
Search Emirates flights
Thai AirwaysCheapest£868Average£954FlexibilityNo cancel feeOn-time77%
Search Thai Airways flights

Fly with Cheapflights

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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.

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