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Cheap flights from London to Siem Reap, Cambodia from £153

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 16/11. Fares are subject to change and may not be available on all flights or dates of travel.
LON — SAI
5 Jul — 12 Jul1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from London to Siem Reap

Enter your travel dates to find the best prices.

Cheapest flights from London to Siem Reap
Explore the most affordable flight options available from London to Siem Reap. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 5 June 2026.

Mon 16/1109:20
LGW
-
SAI
1 stop17h 30m
Singapore Airlines
Fri 4/1210:45
SAI
-
LGW
1 stop26h 40m
Singapore Airlines
Deal found 3/6£188
Tue 10/1121:45
LHR
-
SAI
1 stop35h 10m
Singapore Airlines
Thu 3/1210:45
SAI
-
LHR
1 stop26h 10m
Singapore Airlines
Deal found 3/6£216
Mon 22/614:55
STN
-
SAI
1 stop24h 35m
Emirates
Tue 7/723:50
SAI
-
STN
1 stop19h 05m
Emirates
Deal found 3/6£524
Mon 22/614:35
LGW
-
SAI
1 stop24h 55m
Emirates
Tue 7/723:50
SAI
-
LGW
1 stop25h 55m
Emirates
Deal found 3/6£530
Mon 22/621:45
LHR
-
SAI
2 stops38h 05m
Etihad Airways
Tue 7/719:20
SAI
-
LHR
2 stops41h 40m
Etihad Airways
Deal found 3/6£575
Wed 10/621:45
LHR
-
SAI
2 stops31h 30m
Etihad Airways
Tue 16/619:20
SAI
-
LHR
2 stops29h 25m
Etihad Airways
Deal found 5/6£588
Fri 26/621:45
LHR
-
SAI
2 stops38h 05m
Etihad Airways
Fri 3/715:10
SAI
-
LHR
2 stops45h 50m
Etihad Airways
Deal found 4/6£589
Tue 15/912:20
LHR
-
SAI
2 stops24h 35m
Multiple Airlines
Wed 23/909:40
SAI
-
LHR
2 stops18h 05m
Multiple Airlines
Deal found 2/6£595
Tue 15/909:25
LGW
-
SAI
2 stops27h 30m
SWISS
Wed 23/909:40
SAI
-
LGW
2 stops28h 45m
SWISS
Deal found 2/6£598
Mon 14/918:40
LHR
-
SAI
2 stops33h 00m
SWISS
Tue 22/909:40
SAI
-
LHR
2 stops18h 05m
SWISS
Deal found 2/6£605
Wed 15/714:45
LHR
-
SAI
2 stops38h 30m
Etihad Airways
Sat 25/715:10
SAI
-
LHR
2 stops21h 50m
Etihad Airways
Deal found 2/6£607
Fri 25/906:00
LHR
-
SAI
2 stops30h 55m
Austrian Airlines
Tue 29/912:55
SAI
-
LHR
2 stops25h 25m
Austrian Airlines
Deal found 2/6£614

Find flight deals from London to Siem Reap

Discover tips and strategies to find the most affordable flight options for your journey from London (LON) to Siem Reap (SAI). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 5 June 2026.

Round-trip from

£188

One-way from

£153

Popular in

December

Cheapest in

September

Average price

£849
Singapore Airlines
  • Singapore Airlines
  • 16/11-4/12
  • 2 total stops
  • 44h 10m total
  • London to Siem Reap
Search Deals
Singapore Airlines
  • Singapore Airlines
  • 16/11
  • 1 total stop
  • 23h 35m total
  • London to Siem Reap
Search Deals
Highest demand for flights based on searches. 7% potential increase in price (£50 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 June 2026
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from London 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 5 June 2026.
Use the filters below to find and compare flights from London 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

Tue 15/9

13:10-18:55

2 stops23h 45m

Siem Reap–Angkor Intl

Wed 23/9

09:40-08:40

2 stops29h 00m

£628

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

£699

LondonSiem Reap

LGW - SAI

LGWSAI

London Gatwick

Tue 8/9

11:35-20:10

3 stops26h 35m

Siem Reap–Angkor Intl

Sat 26/9

12:55-06:55

2 stops24h 00m

£737

LondonSiem Reap

STN - SAI

STNSAI

London Stansted

Mon 2/11

14:05-21:10

2 stops24h 05m

Siem Reap–Angkor Intl

Tue 10/11

23:50-12:05

2 stops19h 15m

£755

LondonSiem Reap

STN - SAI

STNSAI

London Stansted

Mon 14/9

14:55-21:30

2 stops24h 35m

Siem Reap–Angkor Intl

Tue 22/9

23:50-12:55

2 stops19h 05m

£755

LondonSiem Reap

STN - SAI

STNSAI

London Stansted

Thu 2/7

21:05-21:30

2 stops42h 25m

Siem Reap–Angkor Intl

Thu 9/7

23:50-18:45

2 stops24h 55m

£764

LondonSiem Reap

LCY - SAI

LCYSAI

London City

Fri 21/8

13:10-18:55

2 stops23h 45m

Siem Reap–Angkor Intl

Thu 3/9

10:30-08:40

2 stops28h 10m

£769

LondonSiem Reap

LGW - SAI

LGWSAI

London Gatwick

Sun 5/7

23:55-21:30

2 stops39h 35m

Siem Reap–Angkor Intl

Tue 14/7

23:50-19:45

2 stops25h 55m

£771

LondonSiem Reap

LGW - SAI

LGWSAI

London Gatwick

Tue 1/12

23:55-21:10

2 stops38h 15m

Siem Reap–Angkor Intl

Mon 14/12

13:20-11:40

2 stops29h 20m

£777

LondonSiem Reap

LGW - SAI

LGWSAI

London Gatwick

Sun 15/11

23:55-21:10

2 stops38h 15m

Siem Reap–Angkor Intl

Mon 30/11

13:20-11:40

2 stops29h 20m

£777

Flights are sorted by cheapest return flights first.

Deals found on 3/6

Showing 1-10 of 60 resultsSorted by cheapest first
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Best time to book a flight from London to Siem Reap

Have a flexible travel schedule? Discover the best time to fly to Siem Reap from London 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 London to Siem Reap

What is the cheapest month to book a flight from London to Siem Reap?

Currently, May is the cheapest month in which you can book a flight from London to Siem Reap (average of £530). Flying from London to Siem Reap in July is currently the most expensive (average of £913). 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.

How much does it cost for a return flight from London to Siem Reap?

What’s the top stopover airport for flights from London to Siem Reap?

Share of one-stop return flights from London to Siem Reap chosen by Cheapflights users in the past 12 months, using the same stopover each way.

Singapore (SIN) – chosen by Cheapflights users on 68% of one-stop itineraries from London to Siem Reap on Cheapflights.

What’s the cheapest stopover airport for flights from London to Siem Reap?

Average return fare for one-stop flights from London to Siem Reap, chosen by Cheapflights users in the past 12 months, with the same stopover each way.

Singapore (SIN) is the most affordable one-stop option, with an average return flight price of £758.

What’s the fastest stopover option from London to Siem Reap?

Shortest average travel time for one-stop one-way flights from London to Siem Reap, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by stopover airport.

Flights via Bangkok (BKK) have the shortest average one-way travel time for one-stop routes: 13h 58m.

Which airport typically offers the quickest stopover for flights from London to Siem Reap?

Average stopover duration for one-stop one-way flights from London to Siem Reap, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.

Flights via Bangkok (BKK) offer the fastest connection on this route, with an average stopover time of 1h 46m.

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 5 June 2026.
Read through reviews of airlines operating flights from London 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
1,532 reviews
Check prices

Overall

8.2

Food

7.8

Comfort

8.0

Crew

8.6

Entertainment

8.1

Boarding

8.3

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.
Singapore Airlines
8.2
Very Good
1,532 reviews
Singapore Airlines
8.2
Very Good
1,532 reviews
Check prices

Overall

8.2

Food

7.8

Comfort

8.0

Crew

8.6

Entertainment

8.1

Boarding

8.3

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.
Emirates
8.1
Very Good
3,576 reviews
Singapore Airlines
8.2
Very Good
1,532 reviews
Check prices

Overall

8.2

Food

7.8

Comfort

8.0

Crew

8.6

Entertainment

8.1

Boarding

8.3

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.
Thai Airways
7.9
Good
404 reviews
Singapore Airlines
8.2
Very Good
1,532 reviews
Check prices

Overall

8.2

Food

7.8

Comfort

8.0

Crew

8.6

Entertainment

8.1

Boarding

8.3

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.
Vietnam Airlines
7.7
Good
271 reviews
Singapore Airlines
8.2
Very Good
1,532 reviews
Check prices

Overall

8.2

Food

7.8

Comfort

8.0

Crew

8.6

Entertainment

8.1

Boarding

8.3

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.
British Airways
6.7
Okay
8,028 reviews
Singapore Airlines
8.2
Very Good
1,532 reviews
Check prices

Overall

8.2

Food

7.8

Comfort

8.0

Crew

8.6

Entertainment

8.1

Boarding

8.3

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 London 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 London?

    Located just 24.7 mi from the city center, Siem Reap–Angkor Intl is the airport most travelers will use when flying to Siem Reap from London. Booking flights from London to Siem Reap–Angkor Intl (SAI) should be relatively easy as there are 0 daily inbound flights from London from 5 different airlines.

  • How long is the flight from London to Siem Reap?

    A quick flight from London to Siem Reap can take about 23h 45m. SWISS provides one of the quickest options available for as low as £628. London and Siem Reap are separated by a distance of 6084 mi. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

  • What are the cheapest airlines flying from London to Siem Reap round-trip?

    Our cheapest airline available from London to Siem Reap is Austrian Airlines. Our recent data shows that you can find tickets from as low as £541 on this airline. Additional options worth looking into are Lufthansa and Vietnam Airlines, starting at £599 and £621 round-trip. Austrian Airlines is priced at 35% lower than the current average price of a flight leaving 3 months from now.

  • What are the cheapest airlines to fly from London to Siem Reap one-way?

    The cheapest airline one-way is Vietnam Airlines, with whom users have recently found tickets for as low as £453. However, be on the lookout for offers from Singapore Airlines and Thai Airways, as they are both options that can get you from London to Siem Reap for a low price.

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

    When deciding which route to take from London to Siem Reap consider London Heathrow - Siem Reap–Angkor Intl, London Gatwick - Siem Reap–Angkor Intl or London Stansted - Siem Reap–Angkor Intl as they are the most popular.

  • Can I find deals for flights from London to Siem Reap that include hotel bookings?

    Yes. In addition to deals on London to Siem Reap flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from London to Siem Reap?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from London to Siem Reap.

  • Can I find deals for business class flights from London to Siem Reap?

    Yes. Cheapflights offers flight deals from London 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 London to Siem Reap?

    Currently, May is the cheapest month in which you can book a flight from London to Siem Reap (average of £530). Flying from London to Siem Reap in July is currently the most expensive (average of £913). 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 5 airlines flying from London to Siem Reap

Discover the top 5 airlines that operate flights from London 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 5 June 2026.
AirlineCheapestAverageFlexibilityOn-time
Austrian AirlinesCheapest£541Average£686FlexibilityNo cancel feeOn-time78%
Search Austrian Airlines flights
LufthansaCheapest£599Average£770FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
Vietnam AirlinesCheapest£621Average£817FlexibilityNo cancel feeOn-time81%
Search Vietnam Airlines flights
Singapore AirlinesCheapest£666Average£911FlexibilityNo cancel feeOn-time81%
Search Singapore Airlines flights
Thai AirwaysCheapest£872Average£958FlexibilityNo 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 London to Siem Reap?

When you search for this flight from London to Siem Reap, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.

Why should you use Cheapflights to find cheap flight tickets from London to Siem Reap?

Cheapflights helps you find that perfect flight to Siem Reap from London by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

Can Cheapflights find flights from London to Siem Reap with no change fees?

Need flexible booking options for your flight to Siem Reap from London? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.

Can Cheapflights notify me if prices for flights from London to Siem Reap become cheaper?

Of course! You can now track prices for flights from London to Siem Reap and get an alert from Cheapflights when they change. Have a valid email address ready and click the bell icon next to the flight deals above to set up your price alerts.

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