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Cheap flights from the United Kingdom to Siem Reap, Cambodia from £353

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 6/5. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SAI
1 Jun — 8 Jun1
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 May 2026.

Wed 6/521:45
LHR
-
SAI
2 stops31h 30m
Etihad Airways
Sat 16/515:10
SAI
-
LHR
2 stops21h 50m
Etihad Airways
Deal found 29/4£559
Fri 12/621:45
LHR
-
SAI
2 stops29h 15m
Etihad Airways
Thu 25/615:10
SAI
-
LHR
2 stops21h 50m
Etihad Airways
Deal found 1/5£583
Sun 10/509:30
LHR
-
SAI
2 stops22h 50m
Etihad Airways
Sat 16/515:10
SAI
-
LHR
2 stops21h 50m
Etihad Airways
Deal found 30/4£591
Thu 7/509:30
LHR
-
SAI
2 stops25h 25m
Etihad Airways
Thu 28/515:10
SAI
-
LHR
2 stops33h 35m
Etihad Airways
Deal found 1/5£593
Fri 12/621:45
LHR
-
SAI
2 stops29h 15m
Etihad Airways
Tue 23/615:10
SAI
-
LHR
2 stops27h 35m
Etihad Airways
Deal found 29/4£601
Sat 2/520:45
MAN
-
SAI
2 stops32h 30m
Etihad Airways
Sat 16/515:10
SAI
-
MAN
2 stops21h 45m
Etihad Airways
Deal found 30/4£616
Fri 12/616:15
LHR
-
SAI
2 stops20h 40m
Multiple Airlines
Sat 27/609:40
SAI
-
LHR
2 stops27h 50m
Multiple Airlines
Deal found 29/4£667
Sat 31/1017:00
LGW
-
SAI
2 stops37h 15m
Multiple Airlines
Sat 12/1222:00
SAI
-
LGW
2 stops39h 30m
Multiple Airlines
Deal found 28/4£689
Sun 1/1121:00
LHR
-
SAI
2 stops41h 00m
China Eastern
Sat 12/1222:00
SAI
-
LHR
2 stops50h 30m
China Eastern
Deal found 28/4£691
Sun 1/1121:00
LHR
-
SAI
2 stops41h 00m
China Eastern
Tue 15/1222:00
SAI
-
LHR
2 stops50h 30m
China Eastern
Deal found 1/5£692
Tue 15/921:20
LHR
-
SAI
3 stops64h 50m
Multiple Airlines
Tue 29/912:55
SAI
-
LHR
2 stops24h 00m
Multiple Airlines
Deal found 28/4£701
Fri 25/906:00
LHR
-
SAI
2 stops30h 55m
Austrian Airlines
Tue 29/912:55
SAI
-
LHR
2 stops25h 25m
Austrian Airlines
Deal found 27/4£711

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 May 2026.

Round-trip from

£583

One-way from

£353

Popular in

December

Cheapest in

September

Average price

£737
Etihad Airways
  • Etihad Airways
  • 12/6-25/6
  • 4 total stops
  • 51h 05m total
  • United Kingdom to Siem Reap
Search Deals
6/5
  • 6/5
  • 3 total stops
  • 39h 00m total
  • United Kingdom to Siem Reap
Search Deals
Highest demand for flights based on searches. 7% potential increase in price (£46 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (£23 potential savings vs. average return price).
Search Deals
Average for round-trip flights in May 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 May 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

Thu 14/5

09:30-11:15

2 stops19h 45m

Siem Reap–Angkor Intl

Thu 4/6

15:10-18:45

2 stops33h 35m

£593

LondonSiem Reap

LGW - SAI

LGWSAI

London Gatwick

Fri 12/6

09:25-18:55

2 stops27h 30m

Siem Reap–Angkor Intl

Thu 25/6

09:40-08:25

2 stops28h 45m

£711

LondonSiem Reap

LGW - SAI

LGWSAI

London Gatwick

Sun 14/6

09:05-18:55

2 stops27h 50m

Siem Reap–Angkor Intl

Mon 6/7

09:40-08:25

2 stops28h 45m

£711

LondonSiem Reap

STN - SAI

STNSAI

London Stansted

Mon 15/6

14:55-21:30

2 stops24h 35m

Siem Reap–Angkor Intl

Tue 7/7

23:50-18:45

2 stops24h 55m

£726

LondonSiem Reap

LGW - SAI

LGWSAI

London Gatwick

Tue 16/6

21:45-21:30

2 stops41h 45m

Siem Reap–Angkor Intl

Tue 7/7

23:50-21:30

2 stops27h 40m

£731

LondonSiem Reap

STN - SAI

STNSAI

London Stansted

Tue 16/6

21:05-21:30

2 stops42h 25m

Siem Reap–Angkor Intl

Tue 7/7

23:50-18:45

2 stops24h 55m

£743

LondonSiem Reap

STN - SAI

STNSAI

London Stansted

Mon 22/6

21:05-21:30

2 stops18h 25m

Siem Reap–Angkor Intl

Mon 29/6

12:55-18:45

2 stops35h 50m

£756

LondonSiem Reap

LHR - SAI

LHRSAI

London Heathrow

Mon 15/6

14:25-21:30

2 stops25h 05m

Siem Reap–Angkor Intl

Tue 7/7

23:50-18:40

2 stops24h 50m

£757

LondonSiem Reap

LGW - SAI

LGWSAI

London Gatwick

Sun 14/6

23:55-21:30

2 stops39h 35m

Siem Reap–Angkor Intl

Sat 4/7

23:50-21:30

2 stops27h 40m

£762

LondonSiem Reap

LGW - SAI

LGWSAI

London Gatwick

Mon 15/6

10:05-21:30

2 stops29h 25m

Siem Reap–Angkor Intl

Sat 4/7

23:50-21:30

2 stops27h 40m

£762

Flights are sorted by cheapest return flights first.

Deals found on 30/4

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

How far ahead should I book a flight from United Kingdom to Siem Reap?

The best time to book flights from United Kingdom to Siem Reap is 53 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

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 £522). Flying from United Kingdom to Siem Reap in July is currently the most expensive (average of £900). 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 May 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
1,506 reviews
Check prices

Comfort

8.0

Overall

8.2

Food

7.8

Entertainment

8.0

Boarding

8.3

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
1,506 reviews
Singapore Airlines
8.2
Very Good
1,506 reviews
Check prices

Comfort

8.0

Overall

8.2

Food

7.8

Entertainment

8.0

Boarding

8.3

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
3,567 reviews
Singapore Airlines
8.2
Very Good
1,506 reviews
Check prices

Comfort

8.0

Overall

8.2

Food

7.8

Entertainment

8.0

Boarding

8.3

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
7.9
Good
401 reviews
Singapore Airlines
8.2
Very Good
1,506 reviews
Check prices

Comfort

8.0

Overall

8.2

Food

7.8

Entertainment

8.0

Boarding

8.3

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
264 reviews
Singapore Airlines
8.2
Very Good
1,506 reviews
Check prices

Comfort

8.0

Overall

8.2

Food

7.8

Entertainment

8.0

Boarding

8.3

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
7,939 reviews
Singapore Airlines
8.2
Very Good
1,506 reviews
Check prices

Comfort

8.0

Overall

8.2

Food

7.8

Entertainment

8.0

Boarding

8.3

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 19h 45m. Etihad Airways provides one of the quickest options available for as low as £593. 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 £417 on Vietnam Airlines. Other airlines that offer cheap prices include Singapore Airlines from £476 and Thai Airways from £551 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 £522). Flying from United Kingdom to Siem Reap in July is currently the most expensive (average of £900). 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 2 May 2026.
AirlineCheapestAverageFlexibilityOn-time
Austrian AirlinesCheapest£533Average£679FlexibilityNo cancel feeOn-time78%
Search Austrian Airlines flights
LufthansaCheapest£591Average£759FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
Vietnam AirlinesCheapest£609Average£798FlexibilityNo cancel feeOn-time81%
Search Vietnam Airlines flights
Singapore AirlinesCheapest£656Average£889FlexibilityNo cancel feeOn-time81%
Search Singapore Airlines flights
EmiratesCheapest£842Average£920FlexibilityNo cancel feeOn-time75%
Search Emirates flights
Thai AirwaysCheapest£852Average£932FlexibilityNo 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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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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