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Cheap flights from the United Kingdom to Siem Reap, Cambodia from £293

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 19/5. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SAI
12 Apr — 19 Apr1
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 13 March 2026.

Thu 12/1110:30
LGW
-
SAI
2 stops51h 30m
China Eastern
Thu 26/1122:00
SAI
-
LGW
2 stops39h 30m
China Eastern
Deal found 13/3£537
Tue 24/1121:00
LHR
-
SAI
3 stops41h 00m
China Eastern
Tue 8/1222:00
SAI
-
LHR
3 stops50h 30m
China Eastern
Deal found 13/3£566
Thu 4/611:35
LGW
-
SAI
3 stops26h 35m
China Eastern
Wed 10/621:10
SAI
-
LGW
3 stops47h 50m
China Eastern
Deal found 12/3£571
Fri 30/1021:00
LHR
-
SAI
2 stops29h 10m
Multiple Airlines
Thu 12/1122:00
SAI
-
LHR
2 stops50h 30m
Multiple Airlines
Deal found 10/3£578
Tue 2/613:50
LHR
-
SAI
2 stops22h 55m
SWISS
Tue 9/609:40
SAI
-
LHR
2 stops18h 05m
SWISS
Deal found 11/3£584
Mon 23/1119:25
LHR
-
SAI
2 stops16h 20m
Multiple Airlines
Tue 8/1209:55
SAI
-
LHR
2 stops18h 45m
Multiple Airlines
Deal found 13/3£592
Mon 23/1119:25
LHR
-
SAI
2 stops16h 20m
Austrian Airlines
Wed 9/1219:25
SAI
-
LHR
2 stops25h 40m
Austrian Airlines
Deal found 13/3£593
Sun 31/508:45
LHR
-
SAI
2 stops28h 00m
SWISS
Tue 9/609:40
SAI
-
LHR
2 stops18h 05m
SWISS
Deal found 12/3£595
Sun 22/1121:00
LHR
-
SAI
2 stops41h 00m
China Eastern
Sat 5/1222:00
SAI
-
LHR
2 stops50h 30m
China Eastern
Deal found 13/3£598
Mon 18/509:25
LGW
-
SAI
2 stops27h 20m
SWISS
Tue 16/609:40
SAI
-
LGW
2 stops28h 45m
SWISS
Deal found 11/3£598
Wed 20/513:50
LHR
-
SAI
2 stops22h 55m
SWISS
Tue 16/609:40
SAI
-
LHR
2 stops28h 15m
SWISS
Deal found 11/3£599
Tue 17/1121:00
LHR
-
SAI
3 stops41h 00m
China Eastern
Thu 3/1222:00
SAI
-
LHR
2 stops50h 30m
China Eastern
Deal found 12/3£599

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 13 March 2026.

Round-trip from

£571

One-way from

£293

Popular in

December

Cheapest in

September

Average price

£854
China Eastern
  • China Eastern
  • 4/6-10/6
  • 6 total stops
  • 74h 25m total
  • United Kingdom to Siem Reap
Search Deals
19/5
  • 19/5
  • 3 total stops
  • 50h 15m total
  • United Kingdom to Siem Reap
Search Deals
Highest demand for flights based on searches. 6% potential increase in price (£47 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 March 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 13 March 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

LondonSiem Reap

LHR - SAI

LHRSAI

London Heathrow

Tue 2/6

13:50-18:45

2 stops22h 55m

Siem Reap–Angkor Intl

Tue 9/6

09:40-21:45

2 stops18h 05m

£595

LondonSiem Reap

LHR - SAI

LHRSAI

London Heathrow

Sun 31/5

08:45-18:45

2 stops28h 00m

Siem Reap–Angkor Intl

Tue 9/6

09:40-21:45

2 stops18h 05m

£595

LondonSiem Reap

LHR - SAI

LHRSAI

London Heathrow

Tue 19/5

21:20-20:10

3 stops64h 50m

Siem Reap–Angkor Intl

Wed 17/6

21:10-18:40

2 stops27h 30m

£599

LondonSiem Reap

LHR - SAI

LHRSAI

London Heathrow

Mon 18/5

08:40-18:45

2 stops28h 05m

Siem Reap–Angkor Intl

Wed 17/6

16:00-07:55

2 stops21h 55m

£621

LondonSiem Reap

LHR - SAI

LHRSAI

London Heathrow

Tue 2/6

13:50-18:45

2 stops22h 55m

Siem Reap–Angkor Intl

Mon 8/6

10:30-07:55

2 stops27h 25m

£627

LondonSiem Reap

LHR - SAI

LHRSAI

London Heathrow

Sun 31/5

08:45-18:45

2 stops28h 00m

Siem Reap–Angkor Intl

Mon 8/6

10:30-07:55

2 stops27h 25m

£627

LondonSiem Reap

LCY - SAI

LCYSAI

London City

Wed 20/5

09:15-18:45

2 stops27h 30m

Siem Reap–Angkor Intl

Tue 16/6

09:40-08:40

2 stops29h 00m

£642

LondonSiem Reap

LHR - SAI

LHRSAI

London Heathrow

Thu 30/4

18:55-18:20

1 stop17h 25m

Siem Reap–Angkor Intl

Mon 25/5

19:10-17:50

1 stop28h 40m

£645

LondonSiem Reap

LCY - SAI

LCYSAI

London City

Tue 2/6

09:15-18:45

2 stops27h 30m

Siem Reap–Angkor Intl

Tue 9/6

10:30-08:40

2 stops28h 10m

£657

LondonSiem Reap

LGW - SAI

LGWSAI

London Gatwick

Tue 12/5

11:35-20:10

2 stops26h 35m

Siem Reap–Angkor Intl

Sun 17/5

22:35-15:00

2 stops22h 25m

£682

Flights are sorted by cheapest return flights first.

Deals found on 11/3

Showing 1-10 of 60 resultsSorted by cheapest first
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2
3
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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, March is the cheapest month in which you can book a flight from United Kingdom to Siem Reap (average of £590). Flying from United Kingdom to Siem Reap in August is currently the most expensive (average of £1,053). 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 13 March 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
1,475 reviews
Check prices

Overall

8.2

Boarding

8.3

Comfort

8.0

Crew

8.6

Entertainment

8.0

Food

7.8

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
1,475 reviews
Singapore Airlines
8.2
Very Good
1,475 reviews
Check prices

Overall

8.2

Boarding

8.3

Comfort

8.0

Crew

8.6

Entertainment

8.0

Food

7.8

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
3,542 reviews
Singapore Airlines
8.2
Very Good
1,475 reviews
Check prices

Overall

8.2

Boarding

8.3

Comfort

8.0

Crew

8.6

Entertainment

8.0

Food

7.8

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
7.8
Good
392 reviews
Singapore Airlines
8.2
Very Good
1,475 reviews
Check prices

Overall

8.2

Boarding

8.3

Comfort

8.0

Crew

8.6

Entertainment

8.0

Food

7.8

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
239 reviews
Singapore Airlines
8.2
Very Good
1,475 reviews
Check prices

Overall

8.2

Boarding

8.3

Comfort

8.0

Crew

8.6

Entertainment

8.0

Food

7.8

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
7,786 reviews
Singapore Airlines
8.2
Very Good
1,475 reviews
Check prices

Overall

8.2

Boarding

8.3

Comfort

8.0

Crew

8.6

Entertainment

8.0

Food

7.8

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 22h 55m. SWISS provides one of the quickest options available for as low as £595. United Kingdom and Siem Reap are separated by a distance of 6106 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 £427 on Vietnam Airlines. Other airlines that offer cheap prices include Singapore Airlines from £488 and Thai Airways from £559 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 £590). Flying from United Kingdom to Siem Reap in August is currently the most expensive (average of £1,053). 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

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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 13 March 2026.
AirlineCheapestAverageFlexibilityOn-time
Austrian AirlinesCheapest£546Average£698FlexibilityNo cancel feeOn-time78%
Search Austrian Airlines flights
LufthansaCheapest£605Average£777FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
Vietnam AirlinesCheapest£624Average£744FlexibilityNo cancel feeOn-time81%
Search Vietnam Airlines flights
Singapore AirlinesCheapest£672Average£899FlexibilityNo cancel feeOn-time81%
Search Singapore Airlines flights
Thai AirwaysCheapest£869Average£924FlexibilityNo cancel feeOn-time77%
Search Thai Airways flights
EmiratesCheapest£907Average£979FlexibilityNo cancel feeOn-time75%
Search Emirates 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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