Find flights
When to book
Airlines
FAQs

Cheap flights from the United Kingdom to Siem Reap, Cambodia from £355

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 26/5. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SAI
11 May — 18 May1
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 11 April 2026.

Tue 10/1121:00
LHR
-
SAI
3 stops41h 00m
China Eastern
Thu 3/1222:00
SAI
-
LHR
2 stops50h 30m
China Eastern
Deal found 7/4£643
Thu 5/1121:00
LHR
-
SAI
2 stops41h 00m
China Eastern
Sat 21/1122:00
SAI
-
LHR
2 stops50h 30m
China Eastern
Deal found 9/4£651
Wed 6/506:15
LTN
-
SAI
3 stops30h 50m
Multiple Airlines
Thu 21/515:10
SAI
-
LTN
3 stops29h 25m
Multiple Airlines
Deal found 5/4£675
Mon 1/615:15
LTN
-
SAI
3 stops24h 15m
Multiple Airlines
Tue 23/612:55
SAI
-
LTN
3 stops37h 00m
Multiple Airlines
Deal found 10/4£689
Tue 3/1121:00
LHR
-
SAI
3 stops41h 00m
China Eastern
Thu 3/1222:00
SAI
-
LHR
2 stops50h 30m
China Eastern
Deal found 6/4£690
Tue 10/1121:00
LHR
-
SAI
2 stops41h 00m
China Eastern
Sat 5/1222:00
SAI
-
LHR
2 stops50h 30m
China Eastern
Deal found 7/4£693
Wed 4/1121:00
LHR
-
SAI
2 stops29h 10m
Multiple Airlines
Sat 21/1122:00
SAI
-
LHR
3 stops50h 30m
Multiple Airlines
Deal found 9/4£698
Mon 1/605:40
LTN
-
SAI
3 stops27h 10m
Multiple Airlines
Tue 16/612:55
SAI
-
LTN
3 stops37h 00m
Multiple Airlines
Deal found 5/4£700
Tue 28/421:05
STN
-
SAI
2 stops42h 25m
Emirates
Tue 19/523:50
SAI
-
STN
2 stops24h 55m
Emirates
Deal found 7/4£706
Tue 3/1110:30
LGW
-
SAI
2 stops51h 30m
China Eastern
Thu 3/1222:00
SAI
-
LGW
3 stops39h 30m
China Eastern
Deal found 6/4£712
Sun 26/421:45
LGW
-
SAI
2 stops41h 45m
Emirates
Tue 19/523:50
SAI
-
LGW
2 stops25h 55m
Emirates
Deal found 7/4£713
Sun 1/1121:00
LHR
-
SAI
2 stops41h 00m
Multiple Airlines
Sun 29/1119:10
SAI
-
LHR
2 stops29h 20m
Multiple Airlines
Deal found 9/4£715

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 11 April 2026.

Round-trip from

£689

One-way from

£355

Popular in

December

Cheapest in

September

Average price

£800
1/6-23/6
  • 1/6-23/6
  • 6 total stops
  • 61h 15m total
  • United Kingdom to Siem Reap
Search Deals
26/5
  • 26/5
  • 2 total stops
  • 56h 15m total
  • United Kingdom to Siem Reap
Search Deals
Highest demand for flights based on searches. 7% potential increase in price (£53 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease (£24 potential savings vs. average return price).
Search Deals
Average for round-trip flights in April 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 11 April 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

LTN - SAI

LTNSAI

London Luton

Wed 6/5

06:15-19:05

3 stops30h 50m

Siem Reap–Angkor Intl

Thu 21/5

15:10-14:35

3 stops29h 25m

£675

LondonSiem Reap

LTN - SAI

LTNSAI

London Luton

Mon 1/6

15:15-21:30

3 stops24h 15m

Siem Reap–Angkor Intl

Tue 23/6

12:55-19:55

3 stops37h 00m

£689

LondonSiem Reap

LTN - SAI

LTNSAI

London Luton

Mon 1/6

05:40-14:50

3 stops27h 10m

Siem Reap–Angkor Intl

Tue 16/6

12:55-19:55

3 stops37h 00m

£700
Fastest return journey

LondonSiem Reap

STN - SAI

STNSAI

London Stansted

Mon 27/4

21:05-21:30

2 stops18h 25m

Siem Reap–Angkor Intl

Tue 19/5

23:50-18:45

2 stops24h 55m

£738

LondonSiem Reap

STN - SAI

STNSAI

London Stansted

Sun 26/4

21:05-12:20

2 stops33h 15m

Siem Reap–Angkor Intl

Tue 19/5

23:50-18:45

2 stops24h 55m

£739

LondonSiem Reap

STN - SAI

STNSAI

London Stansted

Sun 3/5

21:05-21:30

2 stops42h 25m

Siem Reap–Angkor Intl

Mon 18/5

13:05-18:45

2 stops35h 40m

£739

LondonSiem Reap

LGW - SAI

LGWSAI

London Gatwick

Wed 29/4

14:35-21:30

2 stops24h 55m

Siem Reap–Angkor Intl

Sat 23/5

23:50-21:30

2 stops27h 40m

£742

LondonSiem Reap

LGW - SAI

LGWSAI

London Gatwick

Mon 27/4

14:35-21:30

2 stops24h 55m

Siem Reap–Angkor Intl

Mon 18/5

13:05-12:35

2 stops29h 30m

£744

LondonSiem Reap

LGW - SAI

LGWSAI

London Gatwick

Wed 29/4

14:35-21:30

2 stops24h 55m

Siem Reap–Angkor Intl

Mon 25/5

13:05-12:35

2 stops29h 30m

£747

LondonSiem Reap

LTN - SAI

LTNSAI

London Luton

Sat 6/6

09:00-19:05

3 stops28h 05m

Siem Reap–Angkor Intl

Sat 13/6

09:40-14:15

3 stops34h 35m

£752

Flights are sorted by cheapest return flights first.

Deals found on 8/4

Showing 1-10 of 60 resultsSorted by cheapest first
1
2
3
...
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, November is the cheapest month in which you can book a flight from United Kingdom to Siem Reap (average of £555). Flying from United Kingdom to Siem Reap in August is currently the most expensive (average of £1,040). 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 11 April 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
1,491 reviews
Check prices

Entertainment

8.0

Overall

8.2

Comfort

8.0

Boarding

8.3

Food

7.8

Crew

8.6

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
1,491 reviews
Singapore Airlines
8.2
Very Good
1,491 reviews
Check prices

Entertainment

8.0

Overall

8.2

Comfort

8.0

Boarding

8.3

Food

7.8

Crew

8.6

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
3,554 reviews
Singapore Airlines
8.2
Very Good
1,491 reviews
Check prices

Entertainment

8.0

Overall

8.2

Comfort

8.0

Boarding

8.3

Food

7.8

Crew

8.6

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
396 reviews
Singapore Airlines
8.2
Very Good
1,491 reviews
Check prices

Entertainment

8.0

Overall

8.2

Comfort

8.0

Boarding

8.3

Food

7.8

Crew

8.6

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
255 reviews
Singapore Airlines
8.2
Very Good
1,491 reviews
Check prices

Entertainment

8.0

Overall

8.2

Comfort

8.0

Boarding

8.3

Food

7.8

Crew

8.6

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
7,871 reviews
Singapore Airlines
8.2
Very Good
1,491 reviews
Check prices

Entertainment

8.0

Overall

8.2

Comfort

8.0

Boarding

8.3

Food

7.8

Crew

8.6

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 18h 25m. Emirates provides one of the quickest options available for as low as £738. 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 £422 on Vietnam Airlines. Other airlines that offer cheap prices include Singapore Airlines from £482 and Thai Airways from £558 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, November is the cheapest month in which you can book a flight from United Kingdom to Siem Reap (average of £555). Flying from United Kingdom to Siem Reap in August is currently the most expensive (average of £1,040). 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 11 April 2026.
AirlineCheapestAverageFlexibilityOn-time
Austrian AirlinesCheapest£539Average£687FlexibilityNo cancel feeOn-time78%
Search Austrian Airlines flights
LufthansaCheapest£598Average£767FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
Vietnam AirlinesCheapest£619Average£804FlexibilityNo cancel feeOn-time81%
Search Vietnam Airlines flights
Singapore AirlinesCheapest£664Average£895FlexibilityNo cancel feeOn-time81%
Search Singapore Airlines flights
Thai AirwaysCheapest£858Average£926FlexibilityNo cancel feeOn-time77%
Search Thai Airways flights
EmiratesCheapest£902Average£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!

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.