Latest deals
Insights
FAQs
Reviews
Price Alerts

Cheap flights from the United Kingdom to Siem Reap from £320

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from the United Kingdom to Siem Reap departing on 30/9. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

Discover deals from 900+ travel sites with momondo.

Voted winner of Europe's Best Travel App 2023

Find the cheapest flights from the United Kingdom to Siem Reap

Recent return flight deals from the United Kingdom to Siem Reap

Enter your travel dates to find the best prices.
SWISS Logo
18:40 - 09:50
LHR
-
SAI
32h 10m
2 stops
SWISS Logo
09:55 - 21:40
SAI
-
LHR
18h 45m
2 stops
£599SWISS
Sat, 31 Oct - Mon, 9 Nov
SWISS Logo
18:40 - 09:40
LHR
-
SAI
33h 00m
2 stops
SWISS Logo
09:40 - 21:45
SAI
-
LHR
18h 05m
2 stops
£599SWISS
Wed, 30 Sep - Mon, 5 Oct
SWISS Logo
18:40 - 09:50
LHR
-
SAI
32h 10m
2 stops
SWISS Logo
16:45 - 11:15
SAI
-
LHR
25h 30m
2 stops
£606SWISS
Sat, 31 Oct - Sat, 7 Nov
China Eastern Logo
10:30 - 21:00
LGW
-
SAI
51h 30m
2 stops
China Eastern Logo
22:00 - 06:30
SAI
-
LGW
39h 30m
2 stops
£621China Eastern
Tue, 27 Oct - Tue, 10 Nov
China Eastern Logo
10:30 - 21:00
LGW
-
SAI
51h 30m
2 stops
China Eastern Logo
22:00 - 14:00
SAI
-
LGW
47h 00m
2 stops
£670China Eastern
Thu, 12 Nov - Thu, 19 Nov
Etihad Airways Logo
08:25 - 12:40
MAN
-
SAI
21h 15m
2 stops
Etihad Airways Logo
13:20 - 06:10
SAI
-
MAN
23h 50m
2 stops
£739Etihad Airways
Thu, 12 Nov - Thu, 26 Nov
Emirates Logo
14:05 - 21:10
STN
-
SAI
24h 05m
2 stops
Emirates Logo
23:50 - 17:55
SAI
-
STN
25h 05m
2 stops
£745Emirates
Fri, 30 Oct - Tue, 10 Nov
Emirates Logo
14:05 - 21:10
STN
-
SAI
24h 05m
2 stops
Emirates Logo
23:50 - 17:55
SAI
-
STN
25h 05m
2 stops
£755Emirates
Mon, 2 Nov - Sat, 7 Nov
Singapore Airlines Logo
10:35 - 15:10
MAN
-
SAI
46h 35m
1 stop
Singapore Airlines Logo
10:45 - 08:35
SAI
-
MAN
28h 50m
1 stop
£798Singapore Airlines
Mon, 12 Oct - Sun, 25 Oct
Etihad Airways Logo
08:25 - 12:40
MAN
-
SAI
45h 15m
2 stops
Etihad Airways Logo
19:25 - 17:55
SAI
-
MAN
53h 30m
2 stops
£860Etihad Airways
Wed, 4 Nov - Wed, 11 Nov

Save money when you book flights with momondo

Big names, great deals

Big names, great deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customise your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Emirates flights from United Kingdom to Siem Reap

Our best Emirates deals on United Kingdom to Siem Reap flight tickets
Emirates
30 Oct
STN14:05London Stansted
24h 05m
2 stops
SAI21:10Siem Reap–Angkor Intl
10 Nov
SAI23:50Siem Reap–Angkor Intl
25h 05m
2 stops
STN17:55London Stansted
£745
Emirates
2 Nov
STN14:05London Stansted
24h 05m
2 stops
SAI21:10Siem Reap–Angkor Intl
7 Nov
SAI23:50Siem Reap–Angkor Intl
25h 05m
2 stops
STN17:55London Stansted
£755
Emirates
19 Aug
LGW14:35London Gatwick
24h 55m
2 stops
SAI21:30Siem Reap–Angkor Intl
16 Sept
SAI12:55Siem Reap–Angkor Intl
24h 25m
2 stops
LGW07:20London Gatwick
£766

China Eastern flights from United Kingdom to Siem Reap

Our best China Eastern deals on United Kingdom to Siem Reap flight tickets
China Eastern
27 Oct
LGW10:30London Gatwick
51h 30m
2 stops
SAI21:00Siem Reap–Angkor Intl
7 Nov
SAI22:00Siem Reap–Angkor Intl
47h 00m
2 stops
LGW14:00London Gatwick
£621
China Eastern
12 Nov
LGW10:30London Gatwick
51h 30m
2 stops
SAI21:00Siem Reap–Angkor Intl
19 Nov
SAI22:00Siem Reap–Angkor Intl
47h 00m
2 stops
LGW14:00London Gatwick
£670
China Eastern
27 Oct
LGW10:30London Gatwick
51h 30m
2 stops
SAI21:00Siem Reap–Angkor Intl
5 Nov
SAI22:00Siem Reap–Angkor Intl
39h 30m
2 stops
LGW06:30London Gatwick
£671

momondo 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, momondo users made 279,928 searches. Data last updated 3 July 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

LHR - SAI

LHRSAI

London Heathrow

Sat 31/10

18:40-09:50

2 stops32h 10m

Siem Reap–Angkor Intl

Mon 9/11

09:55-21:40

2 stops18h 45m

£599

LondonSiem Reap

LHR - SAI

LHRSAI

London Heathrow

Wed 30/9

18:40-09:40

2 stops33h 00m

Siem Reap–Angkor Intl

Mon 5/10

09:40-21:45

2 stops18h 05m

£599

LondonSiem Reap

LHR - SAI

LHRSAI

London Heathrow

Sat 31/10

18:40-09:50

2 stops32h 10m

Siem Reap–Angkor Intl

Sat 7/11

16:45-11:15

2 stops25h 30m

£606

LondonSiem Reap

LGW - SAI

LGWSAI

London Gatwick

Tue 27/10

10:30-21:00

2 stops51h 30m

Siem Reap–Angkor Intl

Tue 10/11

22:00-06:30

2 stops39h 30m

£621

LondonSiem Reap

LGW - SAI

LGWSAI

London Gatwick

Thu 12/11

10:30-21:00

2 stops51h 30m

Siem Reap–Angkor Intl

Thu 19/11

22:00-14:00

2 stops47h 00m

£670
Fastest return journey

ManchesterSiem Reap

MAN - SAI

MANSAI

Manchester

Thu 12/11

08:25-12:40

2 stops21h 15m

Siem Reap–Angkor Intl

Thu 26/11

13:20-06:10

2 stops23h 50m

£739

LondonSiem Reap

STN - SAI

STNSAI

London Stansted

Fri 30/10

14:05-21:10

2 stops24h 05m

Siem Reap–Angkor Intl

Tue 10/11

23:50-17:55

2 stops25h 05m

£745

LondonSiem Reap

STN - SAI

STNSAI

London Stansted

Mon 2/11

14:05-21:10

2 stops24h 05m

Siem Reap–Angkor Intl

Sat 7/11

23:50-17:55

2 stops25h 05m

£755

ManchesterSiem Reap

MAN - SAI

MANSAI

Manchester

Mon 12/10

10:35-15:10

1 stop46h 35m

Siem Reap–Angkor Intl

Sun 25/10

10:45-08:35

1 stop28h 50m

£798

ManchesterSiem Reap

MAN - SAI

MANSAI

Manchester

Wed 4/11

08:25-12:40

2 stops45h 15m

Siem Reap–Angkor Intl

Wed 11/11

19:25-17:55

2 stops53h 30m

£860

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

See travel insights to Siem Reap from

How to get the cheapest flight ticket from United Kingdom to Siem Reap

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Siem Reap?

The month of December is, on average, the cheapest month to fly to Siem Reap from United Kingdom, with most prices found around £188. If you don’t want to visit Siem Reap in December, then you should wait until November to fly from United Kingdom, when ticket prices are also cheap, with an average price of £188.

Can stopping save me money on United Kingdom to Siem Reap flights?

You could potentially save up to 53% on your flight if you consider stops on a United Kingdom to Siem Reap flight.

Cheap United Kingdom to Siem Reap flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from United Kingdom to Siem Reap

Fastest flight time

13h 55m

Direct flights

None
The fastest flight from United Kingdom to Siem Reap takes 13h 55m
There are no direct flights from United Kingdom to Siem Reap. There are no popular flight routes from United Kingdom to Siem Reap.
Search flight deals

Frequently asked questions about flying from the United Kingdom to Siem Reap

  • When did momondo last update prices for flights from United Kingdom to Siem Reap–Angkor Intl Airport?

    Prices for flights from United Kingdom to Siem Reap–Angkor Intl Airport refresh daily.

  • How many operators does momondo search for flights from United Kingdom to Siem Reap–Angkor Intl Airport?

  • How old do you have to be to fly from United Kingdom to Siem Reap–Angkor Intl Airport?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from United Kingdom to Siem Reap–Angkor Intl Airport.

  • What documentation or ID do you need to fly to Siem Reap–Angkor Intl Airport?

    The necessary travel and health documents for your Siem Reap–Angkor Intl Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

Best airlines flying from United Kingdom to Siem Reap

Compare and see reviews for airlines that fly from United Kingdom to Siem Reap with momondo
Airline
Rating
Free Cancellation
Price
Austrian AirlinesPriceFrom £543Free CancellationRating
7.6
939 reviews
Search Austrian Airlines flights
Etihad AirwaysPriceFrom £551Free CancellationRating
7.3
1,473 reviews
Search Etihad Airways flights
Vietnam AirlinesPriceFrom £621Free CancellationRating
7.7
275 reviews
Search Vietnam Airlines flights
Singapore AirlinesPriceFrom £669Free CancellationRating
8.2
1,560 reviews
Search Singapore Airlines flights
Thai AirwaysPriceFrom £829Free CancellationRating
7.9
409 reviews
Search Thai Airways flights
EmiratesPriceFrom £859Free CancellationRating
8.1
3,606 reviews
Search Emirates flights

Why use momondo?

Why should I use momondo to find a flight deal from United Kingdom to Siem Reap?

It is quick and easy to find United Kingdom to Siem Reap flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Siem Reap that suits you.

Can I find flights from United Kingdom to Siem Reap with flexible booking policies on momondo?

Yes. All flights to Siem Reap from United Kingdom on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from United Kingdom to Siem Reap?

momondo helps you find the best flight between United Kingdom and Siem Reap by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

I’m not ready to book a flight from United Kingdom to Siem Reap right now. Can momondo alert me if prices change?

If you are not ready to book a flight from United Kingdom to Siem Reap now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Siem Reap and let you know when they change.

An easier way to manage your Siem Reap trip

We make it super easy to schedule, organise and travel with friends or family. Trips is free – and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Sun 2/8
Sun 9/8
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to Cambodia

Fly your favourite airline to Siem Reap

Airlines are sorted and displayed according to clicks in the past 7 days on momondo
Singapore Airlines
Vietnam Airlines
Emirates
Thai Airways
Austrian Airlines
Etihad Airways