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Cheap flights from the United Kingdom to Siem Reap, Cambodia from £315

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 16/3. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SAI
22 Mar — 29 Mar1
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 20 February 2026.

Sat 31/1010:30
LGW
-
SAI
2 stops39h 40m
Multiple Airlines
Sat 14/1122:00
SAI
-
LGW
2 stops39h 30m
Multiple Airlines
Deal found 19/2£545
Mon 2/1118:40
LHR
-
SAI
2 stops32h 10m
Multiple Airlines
Mon 16/1116:45
SAI
-
LHR
2 stops24h 40m
Multiple Airlines
Deal found 17/2£552
Sat 7/1118:40
LHR
-
SAI
2 stops32h 10m
SWISS
Tue 24/1109:55
SAI
-
LHR
2 stops18h 45m
SWISS
Deal found 18/2£555
Tue 28/408:50
BHX
-
SAI
2 stops27h 55m
SWISS
Tue 23/609:40
SAI
-
BHX
2 stops28h 25m
SWISS
Deal found 16/2£573
Wed 4/1106:00
LHR
-
SAI
2 stops29h 45m
Austrian Airlines
Wed 18/1119:25
SAI
-
LHR
2 stops19h 55m
Austrian Airlines
Deal found 19/2£582
Mon 2/1109:25
LGW
-
SAI
2 stops22h 35m
Multiple Airlines
Mon 16/1110:10
SAI
-
LGW
2 stops27h 15m
Multiple Airlines
Deal found 17/2£582
Mon 2/1119:05
LCY
-
SAI
2 stops31h 45m
SWISS
Mon 16/1116:45
SAI
-
LCY
2 stops22h 55m
SWISS
Deal found 17/2£599
Fri 13/1118:40
LHR
-
SAI
2 stops32h 10m
Multiple Airlines
Sun 22/1113:20
SAI
-
LHR
2 stops50h 00m
Multiple Airlines
Deal found 16/2£602
Fri 8/518:40
LHR
-
SAI
2 stops33h 00m
SWISS
Thu 28/509:40
SAI
-
LHR
2 stops28h 15m
SWISS
Deal found 19/2£605
Tue 28/408:50
BHX
-
SAI
2 stops27h 55m
Multiple Airlines
Tue 23/610:30
SAI
-
BHX
2 stops37h 05m
Multiple Airlines
Deal found 16/2£617
Fri 28/810:25
LGW
-
SAI
3 stops49h 45m
Multiple Airlines
Thu 10/909:45
SAI
-
LGW
3 stops27h 20m
Multiple Airlines
Deal found 19/2£629
Wed 25/1109:25
LGW
-
SAI
2 stops22h 35m
Multiple Airlines
Sat 5/1222:00
SAI
-
LGW
2 stops47h 00m
Multiple Airlines
Deal found 17/2£632

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 20 February 2026.

Round-trip from

£573

One-way from

£315

Popular in

December

Cheapest in

September

Average price

£815
SWISS
  • SWISS
  • 28/4-23/6
  • 4 total stops
  • 56h 20m total
  • United Kingdom to Siem Reap
Search Deals
16/3
  • 16/3
  • 2 total stops
  • 40h 55m total
  • United Kingdom to Siem Reap
Search Deals
Highest demand for flights based on searches. 7% potential increase in price (£52 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 February 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 20 February 2026.
Use the filters below to find and compare flights from the United Kingdom to Siem Reap that are best for you.

Fly from

United Kingdom

Fly to

Siem Reap

Route

Depart

Return

Price

BirminghamSiem Reap

BHX - SAI

BHXSAI

Birmingham

Tue 28/4

08:50-18:45

2 stops27h 55m

Siem Reap–Angkor Intl

Tue 23/6

09:40-08:05

2 stops28h 25m

£573

BirminghamSiem Reap

BHX - SAI

BHXSAI

Birmingham

Tue 28/4

08:50-18:45

2 stops27h 55m

Siem Reap–Angkor Intl

Tue 23/6

10:30-17:35

2 stops37h 05m

£617

LondonSiem Reap

LGW - SAI

LGWSAI

London Gatwick

Fri 8/5

09:25-18:45

2 stops27h 20m

Siem Reap–Angkor Intl

Thu 28/5

09:40-08:25

2 stops28h 45m

£669

LondonSiem Reap

LHR - SAI

LHRSAI

London Heathrow

Wed 18/3

21:00-21:00

3 stops65h 00m

Siem Reap–Angkor Intl

Mon 30/3

21:10-18:40

2 stops27h 30m

£681

LondonSiem Reap

LHR - SAI

LHRSAI

London Heathrow

Wed 18/3

20:55-08:40

2 stops28h 45m

Siem Reap–Angkor Intl

Mon 30/3

14:50-07:00

2 stops46h 10m

£712

EdinburghSiem Reap

EDI - SAI

EDISAI

Edinburgh Turnhouse

Wed 6/5

08:40-21:30

2 stops30h 50m

Siem Reap–Angkor Intl

Wed 27/5

10:30-17:15

2 stops36h 45m

£729

EdinburghSiem Reap

EDI - SAI

EDISAI

Edinburgh Turnhouse

Wed 29/4

08:40-18:45

2 stops28h 05m

Siem Reap–Angkor Intl

Wed 27/5

10:30-17:15

2 stops36h 45m

£729

ManchesterSiem Reap

MAN - SAI

MANSAI

Manchester

Thu 19/3

08:25-15:15

2 stops23h 50m

Siem Reap–Angkor Intl

Thu 26/3

21:40-17:55

2 stops27h 15m

£762

ManchesterSiem Reap

MAN - SAI

MANSAI

Manchester

Wed 22/4

20:45-10:50

2 stops32h 05m

Siem Reap–Angkor Intl

Sat 2/5

14:50-06:55

2 stops22h 05m

£775

EdinburghSiem Reap

EDI - SAI

EDISAI

Edinburgh Turnhouse

Wed 15/4

05:45-14:50

3 stops27h 05m

Siem Reap–Angkor Intl

Wed 6/5

15:35-21:00

3 stops35h 25m

£777

Flights are sorted by cheapest return flights first.

Deals found on 17/2

Showing 1-10 of 60 results
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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, March is the cheapest month in which you can book a flight from United Kingdom to Siem Reap (average of £580). Flying from United Kingdom to Siem Reap in August is currently the most expensive (average of £891). 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 20 February 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
1,463 reviews
Check prices

Comfort

8.0

Boarding

8.3

Entertainment

8.0

Food

7.8

Overall

8.2

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
1,463 reviews
Singapore Airlines
8.2
Very Good
1,463 reviews
Check prices

Comfort

8.0

Boarding

8.3

Entertainment

8.0

Food

7.8

Overall

8.2

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
3,522 reviews
Singapore Airlines
8.2
Very Good
1,463 reviews
Check prices

Comfort

8.0

Boarding

8.3

Entertainment

8.0

Food

7.8

Overall

8.2

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
382 reviews
Singapore Airlines
8.2
Very Good
1,463 reviews
Check prices

Comfort

8.0

Boarding

8.3

Entertainment

8.0

Food

7.8

Overall

8.2

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
7.6
Good
231 reviews
Singapore Airlines
8.2
Very Good
1,463 reviews
Check prices

Comfort

8.0

Boarding

8.3

Entertainment

8.0

Food

7.8

Overall

8.2

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
7,753 reviews
Singapore Airlines
8.2
Very Good
1,463 reviews
Check prices

Comfort

8.0

Boarding

8.3

Entertainment

8.0

Food

7.8

Overall

8.2

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 17h 25m. SWISS provides one of the quickest options available for as low as £798. United Kingdom and Siem Reap are separated by a distance of 6102 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 £421 on Vietnam Airlines. Other airlines that offer cheap prices include Singapore Airlines from £481 and Thai Airways from £536 one-way.

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

    Most travelers choose London City - Siem Reap–Angkor Intl, London Heathrow - 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, March is the cheapest month in which you can book a flight from United Kingdom to Siem Reap (average of £580). Flying from United Kingdom to Siem Reap in August is currently the most expensive (average of £891). 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 20 February 2026.
AirlineCheapestAverageFlexibilityOn-time
Austrian AirlinesCheapest£538Average£687FlexibilityNo cancel feeOn-time78%
Search Austrian Airlines flights
LufthansaCheapest£596Average£766FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
Vietnam AirlinesCheapest£615Average£747FlexibilityNo cancel feeOn-time81%
Search Vietnam Airlines flights
Singapore AirlinesCheapest£662Average£883FlexibilityNo cancel feeOn-time81%
Search Singapore Airlines flights
Thai AirwaysCheapest£856Average£933FlexibilityNo cancel feeOn-time77%
Search Thai Airways flights
EmiratesCheapest£893Average£965FlexibilityNo cancel feeOn-time75%
Search Emirates 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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