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Cheap flights from the United Kingdom to Siem Reap, Cambodia from £394

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 20/5. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SAI
15 Jun — 22 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 16 May 2026.

Wed 10/614:45
LHR
-
SAI
2 stops38h 30m
Etihad Airways
Fri 26/615:10
SAI
-
LHR
2 stops33h 35m
Etihad Airways
Deal found 13/5£587
Sat 6/621:45
LHR
-
SAI
2 stops31h 30m
Etihad Airways
Tue 16/619:20
SAI
-
LHR
2 stops29h 25m
Etihad Airways
Deal found 14/5£588
Wed 4/1110:30
LGW
-
SAI
3 stops27h 30m
China Eastern
Sat 28/1122:00
SAI
-
LGW
2 stops39h 30m
China Eastern
Deal found 11/5£589
Sun 14/609:30
LHR
-
SAI
2 stops19h 45m
Etihad Airways
Tue 30/619:20
SAI
-
LHR
2 stops29h 25m
Etihad Airways
Deal found 11/5£597
Wed 10/621:45
LHR
-
SAI
2 stops31h 30m
Etihad Airways
Thu 25/615:10
SAI
-
LHR
2 stops21h 50m
Etihad Airways
Deal found 13/5£602
Sun 21/609:30
LHR
-
SAI
2 stops19h 45m
Etihad Airways
Sun 28/619:20
SAI
-
LHR
2 stops29h 25m
Etihad Airways
Deal found 14/5£604
Thu 28/509:30
LHR
-
SAI
2 stops25h 25m
Etihad Airways
Thu 18/615:10
SAI
-
LHR
2 stops29h 55m
Etihad Airways
Deal found 11/5£618
Thu 14/509:30
LHR
-
SAI
2 stops25h 25m
Etihad Airways
Thu 4/619:20
SAI
-
LHR
2 stops29h 25m
Etihad Airways
Deal found 13/5£619
Thu 5/1110:30
LGW
-
SAI
2 stops51h 30m
China Eastern
Thu 19/1122:00
SAI
-
LGW
3 stops39h 30m
China Eastern
Deal found 14/5£686
Sun 29/1117:00
LGW
-
SAI
2 stops45h 00m
Multiple Airlines
Sun 20/1219:10
SAI
-
LGW
2 stops25h 50m
Multiple Airlines
Deal found 12/5£692
Wed 4/1117:00
LGW
-
SAI
2 stops43h 05m
Multiple Airlines
Sat 28/1122:00
SAI
-
LGW
2 stops39h 30m
Multiple Airlines
Deal found 11/5£706
Mon 2/1111:20
LGW
-
SAI
1 stop14h 55m
Multiple Airlines
Mon 16/1120:45
SAI
-
LGW
1 stop24h 00m
Multiple Airlines
Deal found 14/5£720

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 16 May 2026.

Round-trip from

£587

One-way from

£394

Popular in

December

Cheapest in

September

Average price

£754
Etihad Airways
  • Etihad Airways
  • 10/6-26/6
  • 4 total stops
  • 72h 05m total
  • United Kingdom to Siem Reap
Search Deals
Etihad Airways
  • Etihad Airways
  • 20/5
  • 2 total stops
  • 32h 30m total
  • United Kingdom to Siem Reap
Search Deals
Highest demand for flights based on searches. 7% potential increase in price (£51 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 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 16 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
Fastest return journey

LondonSiem Reap

LHR - SAI

LHRSAI

London Heathrow

Thu 28/5

09:30-11:15

2 stops19h 45m

Siem Reap–Angkor Intl

Thu 18/6

15:10-07:00

2 stops21h 50m

£649

LondonSiem Reap

LHR - SAI

LHRSAI

London Heathrow

Sun 21/6

08:45-18:55

2 stops28h 10m

Siem Reap–Angkor Intl

Mon 29/6

09:40-07:55

2 stops28h 15m

£682

LondonSiem Reap

LHR - SAI

LHRSAI

London Heathrow

Thu 5/11

21:00-21:00

2 stops41h 00m

Siem Reap–Angkor Intl

Thu 19/11

22:00-17:30

2 stops50h 30m

£703

LondonSiem Reap

LHR - SAI

LHRSAI

London Heathrow

Tue 10/11

21:00-21:00

2 stops41h 00m

Siem Reap–Angkor Intl

Sat 5/12

22:00-17:30

2 stops50h 30m

£705

LondonSiem Reap

LTN - SAI

LTNSAI

London Luton

Tue 9/6

12:30-19:05

3 stops24h 35m

Siem Reap–Angkor Intl

Fri 26/6

09:40-09:25

3 stops29h 45m

£735

LondonSiem Reap

STN - SAI

STNSAI

London Stansted

Wed 4/11

14:05-21:10

2 stops24h 05m

Siem Reap–Angkor Intl

Tue 17/11

23:50-17:55

2 stops25h 05m

£740

LondonSiem Reap

LHR - SAI

LHRSAI

London Heathrow

Tue 9/6

20:45-12:15

2 stops33h 30m

Siem Reap–Angkor Intl

Tue 7/7

19:20-18:45

2 stops29h 25m

£745

LondonSiem Reap

LGW - SAI

LGWSAI

London Gatwick

Mon 2/11

09:40-21:10

2 stops28h 30m

Siem Reap–Angkor Intl

Tue 17/11

23:50-18:25

2 stops25h 35m

£746

LondonSiem Reap

LHR - SAI

LHRSAI

London Heathrow

Tue 14/7

09:30-17:50

2 stops26h 20m

Siem Reap–Angkor Intl

Tue 11/8

15:10-15:05

2 stops29h 55m

£750

LondonSiem Reap

LTN - SAI

LTNSAI

London Luton

Tue 9/6

12:30-19:05

3 stops24h 35m

Siem Reap–Angkor Intl

Thu 25/6

09:40-09:25

3 stops29h 45m

£753

Flights are sorted by cheapest return flights first.

Deals found on 14/5

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 £532). Flying from United Kingdom to Siem Reap in July is currently the most expensive (average of £917). 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 16 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
1,517 reviews
Check prices

Entertainment

8.0

Comfort

8.0

Boarding

8.3

Crew

8.6

Food

7.8

Overall

8.2

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
1,517 reviews
Singapore Airlines
8.2
Very Good
1,517 reviews
Check prices

Entertainment

8.0

Comfort

8.0

Boarding

8.3

Crew

8.6

Food

7.8

Overall

8.2

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
3,572 reviews
Singapore Airlines
8.2
Very Good
1,517 reviews
Check prices

Entertainment

8.0

Comfort

8.0

Boarding

8.3

Crew

8.6

Food

7.8

Overall

8.2

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
1,517 reviews
Check prices

Entertainment

8.0

Comfort

8.0

Boarding

8.3

Crew

8.6

Food

7.8

Overall

8.2

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
268 reviews
Singapore Airlines
8.2
Very Good
1,517 reviews
Check prices

Entertainment

8.0

Comfort

8.0

Boarding

8.3

Crew

8.6

Food

7.8

Overall

8.2

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
7,982 reviews
Singapore Airlines
8.2
Very Good
1,517 reviews
Check prices

Entertainment

8.0

Comfort

8.0

Boarding

8.3

Crew

8.6

Food

7.8

Overall

8.2

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 £649. 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 £425 on Vietnam Airlines. Other airlines that offer cheap prices include Singapore Airlines from £485 and Thai Airways from £562 one-way.

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

    Most travelers choose London Heathrow - Siem Reap–Angkor Intl, London Stansted - 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, May is the cheapest month in which you can book a flight from United Kingdom to Siem Reap (average of £532). Flying from United Kingdom to Siem Reap in July is currently the most expensive (average of £917). 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 16 May 2026.
AirlineCheapestAverageFlexibilityOn-time
Austrian AirlinesCheapest£543Average£692FlexibilityNo cancel feeOn-time78%
Search Austrian Airlines flights
LufthansaCheapest£602Average£773FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
Vietnam AirlinesCheapest£623Average£820FlexibilityNo cancel feeOn-time81%
Search Vietnam Airlines flights
Singapore AirlinesCheapest£668Average£910FlexibilityNo cancel feeOn-time81%
Search Singapore Airlines flights
EmiratesCheapest£858Average£928FlexibilityNo cancel feeOn-time75%
Search Emirates flights
Thai AirwaysCheapest£868Average£949FlexibilityNo 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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