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Cheap flights from the United Kingdom to Siem Reap from £343

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 15/9. 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
0 bags

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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.
Multiple Airlines Logo
16:15 - 18:45
LHR
-
SAI
20h 30m
2 stops
Multiple Airlines Logo
19:30 - 07:30
SAI
-
LHR
42h 00m
2 stops
£573Multiple Airlines
Wed, 20 May - Wed, 27 May
China Eastern Logo
21:20 - 20:10
LHR
-
SAI
40h 50m
3 stops
China Eastern Logo
21:10 - 18:40
SAI
-
LHR
27h 30m
2 stops
£608China Eastern
Wed, 29 Apr - Wed, 20 May
SWISS Logo
18:50 - 09:40
BHX
-
SAI
32h 50m
2 stops
SWISS Logo
09:40 - 08:05
SAI
-
BHX
28h 25m
2 stops
£625SWISS
Thu, 10 Sep - Thu, 24 Sep
Multiple Airlines Logo
11:35 - 08:45
LGW
-
SAI
39h 10m
2 stops
Multiple Airlines Logo
21:10 - 15:00
SAI
-
LGW
47h 50m
3 stops
£632Multiple Airlines
Fri, 10 Apr - Wed, 6 May
SWISS Logo
08:45 - 18:45
LHR
-
SAI
28h 00m
2 stops
SWISS Logo
09:40 - 07:55
SAI
-
LHR
28h 15m
2 stops
£635SWISS
Thu, 10 Sep - Thu, 24 Sep
SWISS Logo
14:05 - 18:45
MAN
-
SAI
22h 40m
2 stops
SWISS Logo
09:40 - 13:20
SAI
-
MAN
33h 40m
2 stops
£650SWISS
Thu, 10 Sep - Thu, 24 Sep
Etihad Airways Logo
09:20 - 12:20
MAN
-
SAI
21h 00m
2 stops
Etihad Airways Logo
19:30 - 06:55
SAI
-
MAN
41h 25m
2 stops
£677Etihad Airways
Sat, 2 May - Sat, 16 May
Emirates Logo
21:05 - 21:30
STN
-
SAI
42h 25m
2 stops
Emirates Logo
23:50 - 18:45
SAI
-
STN
24h 55m
2 stops
£717Emirates
Sun, 12 Apr - Tue, 12 May
Emirates Logo
21:45 - 21:30
LGW
-
SAI
41h 45m
2 stops
Emirates Logo
23:50 - 19:45
SAI
-
LGW
25h 55m
2 stops
£724Emirates
Sun, 12 Apr - Tue, 12 May
KLM Logo
13:45 - 12:20
LCY
-
SAI
16h 35m
2 stops
KLM Logo
19:30 - 20:15
SAI
-
LCY
30h 45m
2 stops
£1,222KLM
Sun, 31 May - Sat, 27 Jun

China Eastern flights from United Kingdom to Region of Siem Reap

Our best China Eastern deals on United Kingdom to Region of Siem Reap flight tickets
China Eastern
29 Apr
LHR21:20London Heathrow
40h 50m
3 stops
SAI20:10Siem Reap–Angkor Intl
20 May
SAI21:10Siem Reap–Angkor Intl
27h 30m
2 stops
LHR18:40London Heathrow
£608
China Eastern
29 Apr
LHR21:20London Heathrow
40h 50m
2 stops
SAI20:10Siem Reap–Angkor Intl
22 May
SAI21:10Siem Reap–Angkor Intl
51h 30m
2 stops
LHR18:40London Heathrow
£695
China Eastern
29 Apr
LHR21:20London Heathrow
40h 50m
3 stops
SAI20:10Siem Reap–Angkor Intl
20 May
SAI21:10Siem Reap–Angkor Intl
51h 30m
3 stops
LHR18:40London Heathrow
£721

Etihad Airways flights from United Kingdom to Region of Siem Reap

Our best Etihad Airways deals on United Kingdom to Region of Siem Reap flight tickets
Etihad Airways
2 May
MAN09:20Manchester
21h 00m
2 stops
SAI12:20Siem Reap–Angkor Intl
16 May
SAI19:30Siem Reap–Angkor Intl
41h 25m
2 stops
MAN06:55Manchester
£677
Etihad Airways
10 Apr
LHR09:15London Heathrow
21h 05m
2 stops
SAI12:20Siem Reap–Angkor Intl
6 May
SAI19:30Siem Reap–Angkor Intl
23h 15m
2 stops
LHR12:45London Heathrow
£788
Etihad Airways
4 May
LHR20:45London Heathrow
30h 20m
2 stops
SAI09:05Siem Reap–Angkor Intl
29 May
SAI19:30Siem Reap–Angkor Intl
29h 15m
2 stops
LHR18:45London Heathrow
£793

momondo Fare Finder

 
Customise your flight search to find flights from United Kingdom to Region of 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 26 March 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

Wed 20/5

16:15-18:45

2 stops20h 30m

Siem Reap–Angkor Intl

Wed 27/5

19:30-07:30

2 stops42h 00m

£573

LondonSiem Reap

LHR - SAI

LHRSAI

London Heathrow

Wed 29/4

21:20-20:10

3 stops40h 50m

Siem Reap–Angkor Intl

Wed 20/5

21:10-18:40

2 stops27h 30m

£608

BirminghamSiem Reap

BHX - SAI

BHXSAI

Birmingham

Thu 10/9

18:50-09:40

2 stops32h 50m

Siem Reap–Angkor Intl

Thu 24/9

09:40-08:05

2 stops28h 25m

£625

LondonSiem Reap

LGW - SAI

LGWSAI

London Gatwick

Fri 10/4

11:35-08:45

2 stops39h 10m

Siem Reap–Angkor Intl

Wed 6/5

21:10-15:00

3 stops47h 50m

£632

LondonSiem Reap

LHR - SAI

LHRSAI

London Heathrow

Thu 10/9

08:45-18:45

2 stops28h 00m

Siem Reap–Angkor Intl

Thu 24/9

09:40-07:55

2 stops28h 15m

£635

ManchesterSiem Reap

MAN - SAI

MANSAI

Manchester

Thu 10/9

14:05-18:45

2 stops22h 40m

Siem Reap–Angkor Intl

Thu 24/9

09:40-13:20

2 stops33h 40m

£650

ManchesterSiem Reap

MAN - SAI

MANSAI

Manchester

Sat 2/5

09:20-12:20

2 stops21h 00m

Siem Reap–Angkor Intl

Sat 16/5

19:30-06:55

2 stops41h 25m

£677

LondonSiem Reap

STN - SAI

STNSAI

London Stansted

Sun 12/4

21:05-21:30

2 stops42h 25m

Siem Reap–Angkor Intl

Tue 12/5

23:50-18:45

2 stops24h 55m

£717

LondonSiem Reap

LGW - SAI

LGWSAI

London Gatwick

Sun 12/4

21:45-21:30

2 stops41h 45m

Siem Reap–Angkor Intl

Tue 12/5

23:50-19:45

2 stops25h 55m

£724
Fastest return journey

LondonSiem Reap

LCY - SAI

LCYSAI

London City

Sun 31/5

13:45-12:20

2 stops16h 35m

Siem Reap–Angkor Intl

Sat 27/6

19:30-20:15

2 stops30h 45m

£1,222

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Siem Reap from

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

If you’re not able to fly to Region of Siem Reap in September, then January is your next best option. Flight prices from United Kingdom to Region of Siem Reap during January average around £749.

How far in advance should I book a flight to Region of Siem Reap?

You are more likely to see cheaper flights to Region of Siem Reap from United Kingdom when booking weeks ahead of your departure date. In general, you can expect to find flights to Region of Siem Reap for around £806 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Region of Siem Reap from United Kingdom for as low as £667 on momondo.

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

You could potentially save up to 4% on your flight if you consider stops on a United Kingdom to Region of Siem Reap flight.

Cheap United Kingdom to Region of Siem Reap flight deals and tips

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

Fastest flight time

16h 35m

Direct flights

None
The fastest flight from United Kingdom to Region of Siem Reap takes 16h 35m
There are no direct flights from United Kingdom to Region of Siem Reap. There are no popular flight routes from United Kingdom to Region of Siem Reap.
Search flight deals

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

    Prices for flights from United Kingdom to Siem Reap were last updated today.

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

  • How old do you have to be to fly from United Kingdom to Siem Reap?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from United Kingdom to Siem Reap.

  • What documentation or ID do you need to fly to Siem Reap?

    The travel and health documents required for your trip to Siem Reap can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Siem Reap. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

Best airlines flying from United Kingdom to Region of Siem Reap

Compare and see reviews for airlines that fly from United Kingdom to Region of Siem Reap with momondo
Airline
Rating
Free Cancellation
Price
Austrian AirlinesPriceFrom £543Free CancellationRating
7.6
902 reviews
Search Austrian Airlines flights
LufthansaPriceFrom £602Free CancellationRating
6.8
7,871 reviews
Search Lufthansa flights
Vietnam AirlinesPriceFrom £621Free CancellationRating
7.7
248 reviews
Search Vietnam Airlines flights
Singapore AirlinesPriceFrom £668Free CancellationRating
8.2
1,484 reviews
Search Singapore Airlines flights
Thai AirwaysPriceFrom £864Free CancellationRating
7.8
394 reviews
Search Thai Airways flights
EmiratesPriceFrom £909Free CancellationRating
8.1
3,542 reviews
Search Emirates flights

Why use momondo?

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

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Siem Reap from United Kingdom.

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?

Yes. momondo can track prices for United Kingdom to Siem Reap flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

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