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Cheap flights from the United Kingdom to Siem Reap, Cambodia from £340

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 13/8. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SAI
29 Jul — 5 Aug1
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 29 June 2026.

Thu 3/919:30
LHR
-
SAI
2 stops17h 25m
Multiple Airlines
Tue 29/909:40
SAI
-
LHR
2 stops18h 05m
Multiple Airlines
Deal found 28/6£593
Wed 2/909:25
LGW
-
SAI
2 stops27h 30m
SWISS
Thu 1/1009:40
SAI
-
LGW
2 stops28h 45m
SWISS
Deal found 28/6£595
Wed 2/913:50
LHR
-
SAI
2 stops23h 05m
SWISS
Thu 1/1009:40
SAI
-
LHR
2 stops28h 15m
SWISS
Deal found 28/6£596
Wed 30/918:40
LHR
-
SAI
2 stops33h 00m
SWISS
Tue 27/1016:45
SAI
-
LHR
2 stops22h 20m
SWISS
Deal found 27/6£610
Tue 1/909:25
LGW
-
SAI
2 stops27h 30m
SWISS
Tue 29/909:40
SAI
-
LGW
2 stops28h 45m
SWISS
Deal found 28/6£610
Tue 1/908:45
LHR
-
SAI
2 stops28h 10m
SWISS
Tue 29/909:40
SAI
-
LHR
2 stops31h 40m
SWISS
Deal found 28/6£611
Wed 2/909:15
LCY
-
SAI
2 stops27h 40m
SWISS
Tue 29/909:40
SAI
-
LCY
2 stops29h 00m
SWISS
Deal found 28/6£611
Tue 1/909:15
LCY
-
SAI
2 stops27h 40m
SWISS
Thu 1/1009:40
SAI
-
LCY
2 stops29h 00m
SWISS
Deal found 28/6£626
Mon 31/822:00
LGW
-
SAI
3 stops40h 10m
China Eastern
Fri 2/1021:10
SAI
-
LGW
2 stops52h 05m
China Eastern
Deal found 28/6£626
Sat 3/1017:50
LHR
-
SAI
2 stops19h 05m
Lufthansa
Sun 18/1019:35
SAI
-
LHR
2 stops27h 30m
Lufthansa
Deal found 25/6£629
Thu 1/1013:50
LHR
-
SAI
2 stops23h 05m
SWISS
Sun 11/1009:40
SAI
-
LHR
2 stops18h 05m
SWISS
Deal found 28/6£631
Thu 3/912:20
LHR
-
SAI
2 stops24h 35m
Multiple Airlines
Wed 30/909:40
SAI
-
LHR
2 stops18h 05m
Multiple Airlines
Deal found 28/6£633

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 29 June 2026.

Round-trip from

£593

One-way from

£340

Popular in

December

Cheapest in

July

Average price

£807
SWISS
  • SWISS
  • 3/9-29/9
  • 4 total stops
  • 35h 30m total
  • United Kingdom to Siem Reap
Search Deals
13/8
  • 13/8
  • 3 total stops
  • 42h 40m total
  • United Kingdom to Siem Reap
Search Deals
Highest demand for flights based on searches. 12% potential increase in price (£84 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease (£28 potential savings vs. average return price).
Search Deals
Average for round-trip flights in June 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 29 June 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

LCY - SAI

LCYSAI

London City

Thu 3/9

13:10-18:55

2 stops23h 45m

Siem Reap–Angkor Intl

Thu 1/10

09:40-08:40

2 stops29h 00m

£611

LondonSiem Reap

LCY - SAI

LCYSAI

London City

Wed 2/9

09:15-18:55

2 stops27h 40m

Siem Reap–Angkor Intl

Thu 1/10

09:40-08:40

2 stops29h 00m

£611

LondonSiem Reap

LGW - SAI

LGWSAI

London Gatwick

Wed 4/11

10:30-21:00

3 stops27h 30m

Siem Reap–Angkor Intl

Thu 26/11

22:00-14:00

3 stops47h 00m

£626

LondonSiem Reap

LGW - SAI

LGWSAI

London Gatwick

Wed 2/9

09:25-18:55

2 stops27h 30m

Siem Reap–Angkor Intl

Wed 30/9

09:40-08:25

2 stops28h 45m

£635

LondonSiem Reap

LGW - SAI

LGWSAI

London Gatwick

Mon 31/8

09:25-18:55

2 stops27h 30m

Siem Reap–Angkor Intl

Sun 13/9

09:40-08:25

2 stops28h 45m

£649

LondonSiem Reap

LCY - SAI

LCYSAI

London City

Wed 2/9

13:10-18:55

2 stops23h 45m

Siem Reap–Angkor Intl

Wed 30/9

09:40-08:40

2 stops29h 00m

£651

LondonSiem Reap

LGW - SAI

LGWSAI

London Gatwick

Wed 4/11

10:30-21:00

3 stops27h 30m

Siem Reap–Angkor Intl

Sat 21/11

22:00-06:30

2 stops39h 30m

£676

LondonSiem Reap

LGW - SAI

LGWSAI

London Gatwick

Fri 6/11

10:30-21:00

3 stops27h 30m

Siem Reap–Angkor Intl

Sat 21/11

22:00-14:00

2 stops47h 00m

£676

LondonSiem Reap

LTN - SAI

LTNSAI

London Luton

Tue 1/9

16:10-09:00

3 stops34h 50m

Siem Reap–Angkor Intl

Tue 22/9

12:55-14:35

3 stops31h 40m

£679

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

3 stops50h 30m

£704

Flights are sorted by cheapest return flights first.

Deals found on 26/6

Showing 1-10 of 60 resultsSorted by cheapest first
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2
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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, February is the cheapest month in which you can book a flight from United Kingdom to Siem Reap (average of £190). Flying from United Kingdom to Siem Reap in August is currently the most expensive (average of £779). 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 29 June 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
1,556 reviews
Check prices

Overall

8.2

Comfort

8.0

Entertainment

8.1

Crew

8.6

Boarding

8.3

Food

7.8

Reviews

1 / 20
8.0
Excellent

Matt,Jun 2026

SIN - CMB

Crew were flat or busy but so awesome and polite. There was one guy, prob the senior crew member, looked and acted way too serious and too important to smile and say hello
Singapore Airlines
8.2
Very Good
1,556 reviews
Singapore Airlines
8.2
Very Good
1,556 reviews
Check prices

Overall

8.2

Comfort

8.0

Entertainment

8.1

Crew

8.6

Boarding

8.3

Food

7.8

Reviews

1 / 20
8.0
Excellent

Matt,Jun 2026

SIN - CMB

Crew were flat or busy but so awesome and polite. There was one guy, prob the senior crew member, looked and acted way too serious and too important to smile and say hello
Emirates
8.1
Very Good
3,602 reviews
Singapore Airlines
8.2
Very Good
1,556 reviews
Check prices

Overall

8.2

Comfort

8.0

Entertainment

8.1

Crew

8.6

Boarding

8.3

Food

7.8

Reviews

1 / 20
8.0
Excellent

Matt,Jun 2026

SIN - CMB

Crew were flat or busy but so awesome and polite. There was one guy, prob the senior crew member, looked and acted way too serious and too important to smile and say hello
Thai Airways
7.9
Good
407 reviews
Singapore Airlines
8.2
Very Good
1,556 reviews
Check prices

Overall

8.2

Comfort

8.0

Entertainment

8.1

Crew

8.6

Boarding

8.3

Food

7.8

Reviews

1 / 20
8.0
Excellent

Matt,Jun 2026

SIN - CMB

Crew were flat or busy but so awesome and polite. There was one guy, prob the senior crew member, looked and acted way too serious and too important to smile and say hello
Vietnam Airlines
7.7
Good
274 reviews
Singapore Airlines
8.2
Very Good
1,556 reviews
Check prices

Overall

8.2

Comfort

8.0

Entertainment

8.1

Crew

8.6

Boarding

8.3

Food

7.8

Reviews

1 / 20
8.0
Excellent

Matt,Jun 2026

SIN - CMB

Crew were flat or busy but so awesome and polite. There was one guy, prob the senior crew member, looked and acted way too serious and too important to smile and say hello
British Airways
6.7
Okay
8,082 reviews
Singapore Airlines
8.2
Very Good
1,556 reviews
Check prices

Overall

8.2

Comfort

8.0

Entertainment

8.1

Crew

8.6

Boarding

8.3

Food

7.8

Reviews

1 / 20
8.0
Excellent

Matt,Jun 2026

SIN - CMB

Crew were flat or busy but so awesome and polite. There was one guy, prob the senior crew member, looked and acted way too serious and too important to smile and say hello

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 23h 45m. SWISS provides one of the quickest options available for as low as £611. United Kingdom and Siem Reap are separated by a distance of 6084 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 £169 on Singapore Airlines. Other airlines that offer cheap prices include Vietnam Airlines from £429 and Etihad Airways from £457 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, February is the cheapest month in which you can book a flight from United Kingdom to Siem Reap (average of £190). Flying from United Kingdom to Siem Reap in August is currently the most expensive (average of £779). 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 5 airlines flying from United Kingdom to Siem Reap

Discover the top 5 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 29 June 2026.
AirlineCheapestAverageFlexibilityOn-time
Austrian AirlinesCheapest£549Average£697FlexibilityNo cancel feeOn-time78%
Search Austrian Airlines flights
Vietnam AirlinesCheapest£627Average£829FlexibilityNo cancel feeOn-time81%
Search Vietnam Airlines flights
Singapore AirlinesCheapest£676Average£951FlexibilityNo cancel feeOn-time81%
Search Singapore Airlines flights
Thai AirwaysCheapest£837Average£973FlexibilityNo cancel feeOn-time77%
Search Thai Airways flights
EmiratesCheapest£867Average£980FlexibilityNo 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!

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