Cheap flights from the United Kingdom to Siem Reap, Cambodia from £362

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 19/6. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SAI
22 Jun — 29 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 23 May 2026.

Fri 19/621:45
LHR
-
SAI
2 stops29h 15m
Etihad Airways
Fri 26/619:20
SAI
-
LHR
2 stops29h 25m
Etihad Airways
Deal found 20/5£587
Sat 4/721:45
LHR
-
SAI
2 stops31h 30m
Etihad Airways
Sun 19/719:20
SAI
-
LHR
2 stops29h 25m
Etihad Airways
Deal found 22/5£589
Tue 16/609:30
LHR
-
SAI
2 stops19h 45m
Etihad Airways
Tue 30/619:20
SAI
-
LHR
2 stops47h 25m
Etihad Airways
Deal found 22/5£596
Thu 19/1110:30
LGW
-
SAI
2 stops51h 30m
China Eastern
Tue 8/1222:00
SAI
-
LGW
2 stops39h 30m
China Eastern
Deal found 19/5£598
Fri 5/620:25
LHR
-
SAI
2 stops30h 35m
Etihad Airways
Thu 11/619:20
SAI
-
LHR
2 stops29h 25m
Etihad Airways
Deal found 21/5£599
Sun 21/609:30
LHR
-
SAI
2 stops22h 50m
Etihad Airways
Sun 28/619:20
SAI
-
LHR
2 stops29h 25m
Etihad Airways
Deal found 22/5£607
Thu 5/1110:30
LGW
-
SAI
2 stops51h 30m
China Eastern
Sat 28/1122:00
SAI
-
LGW
2 stops39h 30m
China Eastern
Deal found 18/5£613
Thu 4/609:30
LHR
-
SAI
2 stops25h 25m
Etihad Airways
Sun 14/613:00
SAI
-
LHR
2 stops56h 05m
Etihad Airways
Deal found 21/5£614
Thu 24/911:35
LGW
-
SAI
3 stops26h 35m
China Eastern
Fri 16/1021:10
SAI
-
LGW
3 stops39h 30m
China Eastern
Deal found 20/5£619
Sat 6/621:45
LHR
-
SAI
2 stops31h 30m
Etihad Airways
Sat 13/615:10
SAI
-
LHR
2 stops21h 50m
Etihad Airways
Deal found 21/5£622
Sun 7/609:30
LHR
-
SAI
2 stops19h 45m
Etihad Airways
Thu 11/615:10
SAI
-
LHR
2 stops33h 35m
Etihad Airways
Deal found 21/5£630
Thu 28/509:30
LHR
-
SAI
2 stops25h 25m
Etihad Airways
Thu 18/615:10
SAI
-
LHR
2 stops27h 35m
Etihad Airways
Deal found 18/5£639

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 23 May 2026.

Round-trip from

£587

One-way from

£362

Popular in

December

Cheapest in

September

Average price

£750
Etihad Airways
  • Etihad Airways
  • 19/6-26/6
  • 4 total stops
  • 58h 40m total
  • United Kingdom to Siem Reap
Etihad Airways
  • Etihad Airways
  • 19/6
  • 2 total stops
  • 29h 15m total
  • United Kingdom to Siem Reap
Highest demand for flights based on searches. 7% potential increase in price (£50 potential increase over avg. return price).
Cheapest flight prices on average. 3% potential price decrease (£24 potential savings vs. average return price).
Average for round-trip flights in May 2026

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 23 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

LGW - SAI

LGWSAI

London Gatwick

Tue 10/11

10:30-21:00

2 stops51h 30m

Siem Reap–Angkor Intl

Sat 28/11

22:00-06:30

3 stops39h 30m

£613

LondonSiem Reap

LGW - SAI

LGWSAI

London Gatwick

Tue 22/9

11:35-20:10

3 stops26h 35m

Siem Reap–Angkor Intl

Wed 14/10

21:10-06:40

2 stops39h 30m

£619

LondonSiem Reap

LGW - SAI

LGWSAI

London Gatwick

Thu 24/9

11:35-20:10

3 stops26h 35m

Siem Reap–Angkor Intl

Wed 14/10

21:10-06:40

3 stops39h 30m

£619

LondonSiem Reap

LHR - SAI

LHRSAI

London Heathrow

Sun 7/6

09:30-11:15

2 stops19h 45m

Siem Reap–Angkor Intl

Thu 11/6

15:10-18:45

2 stops33h 35m

£630

LondonSiem Reap

LGW - SAI

LGWSAI

London Gatwick

Fri 13/11

10:30-21:00

3 stops27h 30m

Siem Reap–Angkor Intl

Thu 3/12

22:00-06:30

2 stops39h 30m

£669

LondonSiem Reap

LGW - SAI

LGWSAI

London Gatwick

Thu 19/11

10:30-21:00

2 stops51h 30m

Siem Reap–Angkor Intl

Sat 28/11

22:00-06:30

3 stops39h 30m

£669

LondonSiem Reap

LGW - SAI

LGWSAI

London Gatwick

Tue 27/10

10:30-21:00

2 stops51h 30m

Siem Reap–Angkor Intl

Sat 21/11

22:00-06:30

3 stops39h 30m

£719

LondonSiem Reap

STN - SAI

STNSAI

London Stansted

Tue 22/9

21:05-21:30

2 stops42h 25m

Siem Reap–Angkor Intl

Tue 20/10

23:50-12:55

2 stops43h 05m

£730

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

£730

LondonSiem Reap

LGW - SAI

LGWSAI

London Gatwick

Mon 28/9

10:05-21:30

2 stops29h 25m

Siem Reap–Angkor Intl

Tue 20/10

23:50-21:30

2 stops27h 40m

£736

Flights are sorted by cheapest return flights first.

Deals found on 21/5

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, May is the cheapest month in which you can book a flight from United Kingdom to Siem Reap (average of £529). Flying from United Kingdom to Siem Reap in July is currently the most expensive (average of £911). 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 23 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.

Overall

8.2

Entertainment

8.0

Crew

8.6

Boarding

8.3

Food

7.8

Comfort

8.0

Reviews

1 / 20
10.0
Excellent

Wee Keng,May 2026

SIN - MNL

Was upgraded to Premium Economy seat as PPS member. SQ steward team prepared birthday cake for a colleague which I requested and didn’t follow up. Great service and a great way to fly.

Overall

8.2

Entertainment

8.0

Crew

8.6

Boarding

8.3

Food

7.8

Comfort

8.0

Reviews

1 / 20
10.0
Excellent

Wee Keng,May 2026

SIN - MNL

Was upgraded to Premium Economy seat as PPS member. SQ steward team prepared birthday cake for a colleague which I requested and didn’t follow up. Great service and a great way to fly.

Overall

8.2

Entertainment

8.0

Crew

8.6

Boarding

8.3

Food

7.8

Comfort

8.0

Reviews

1 / 20
10.0
Excellent

Wee Keng,May 2026

SIN - MNL

Was upgraded to Premium Economy seat as PPS member. SQ steward team prepared birthday cake for a colleague which I requested and didn’t follow up. Great service and a great way to fly.

Overall

8.2

Entertainment

8.0

Crew

8.6

Boarding

8.3

Food

7.8

Comfort

8.0

Reviews

1 / 20
10.0
Excellent

Wee Keng,May 2026

SIN - MNL

Was upgraded to Premium Economy seat as PPS member. SQ steward team prepared birthday cake for a colleague which I requested and didn’t follow up. Great service and a great way to fly.

Overall

8.2

Entertainment

8.0

Crew

8.6

Boarding

8.3

Food

7.8

Comfort

8.0

Reviews

1 / 20
10.0
Excellent

Wee Keng,May 2026

SIN - MNL

Was upgraded to Premium Economy seat as PPS member. SQ steward team prepared birthday cake for a colleague which I requested and didn’t follow up. Great service and a great way to fly.

Overall

8.2

Entertainment

8.0

Crew

8.6

Boarding

8.3

Food

7.8

Comfort

8.0

Reviews

1 / 20
10.0
Excellent

Wee Keng,May 2026

SIN - MNL

Was upgraded to Premium Economy seat as PPS member. SQ steward team prepared birthday cake for a colleague which I requested and didn’t follow up. Great service and a great way to fly.

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. China Eastern provides one of the quickest options available for as low as £630. 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 £422 on Vietnam Airlines. Other airlines that offer cheap prices include Emirates from £440 and Singapore Airlines from £482 one-way.

  • What are the most popular routes 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 £529). Flying from United Kingdom to Siem Reap in July is currently the most expensive (average of £911). 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 23 May 2026.
AirlineCheapestAverageFlexibilityOn-time
Austrian AirlinesCheapest£539Average£685FlexibilityNo cancel feeOn-time78%
Search Austrian Airlines flights
LufthansaCheapest£598Average£768FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
Vietnam AirlinesCheapest£619Average£815FlexibilityNo cancel feeOn-time81%
Search Vietnam Airlines flights
Singapore AirlinesCheapest£664Average£904FlexibilityNo cancel feeOn-time81%
Search Singapore Airlines flights
EmiratesCheapest£853Average£929FlexibilityNo cancel feeOn-time75%
Search Emirates flights
Thai AirwaysCheapest£863Average£943FlexibilityNo cancel feeOn-time77%
Search Thai Airways 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.