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Cheap flights from London Heathrow Airport to Phnom Penh from £321

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from London Heathrow Airport to Phnom Penh departing on 12/9. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Find the cheapest flights from London Heathrow Airport to Phnom Penh

Cheap return flights

Air China Logo
17:40 - 23:10LHR-PNH
22h 30m1 stop
Air China Logo
00:25 - 17:50PNH-LHR
24h 25m1 stop
£383Air China
Find Deal
Mon, 17 Nov - Sun, 30 Nov
Air China Logo
17:40 - 23:10LHR-PNH
22h 30m1 stop
Air China Logo
00:25 - 17:50PNH-LHR
24h 25m1 stop
£404Air China
Find Deal
Mon, 3 Nov - Sun, 16 Nov
Air China Logo
20:25 - 23:10LHR-PNH
19h 45m1 stop
Air China Logo
00:25 - 17:50PNH-LHR
24h 25m1 stop
£404Air China
Find Deal
Mon, 3 Nov - Sun, 16 Nov
Shenzhen Airlines Logo
22:05 - 11:10LHR-PNH
31h 05m1 stop
Shenzhen Airlines Logo
12:15 - 20:10PNH-LHR
37h 55m1 stop
£442Shenzhen Airlines
Find Deal
Mon, 13 Oct - Sat, 25 Oct
Shenzhen Airlines Logo
22:05 - 11:10LHR-PNH
31h 05m1 stop
Shenzhen Airlines Logo
12:15 - 20:00PNH-LHR
37h 45m1 stop
£445Shenzhen Airlines
Find Deal
Mon, 15 Sep - Tue, 30 Sep
Shenzhen Airlines Logo
22:05 - 11:10LHR-PNH
31h 05m1 stop
Shenzhen Airlines Logo
12:15 - 19:50PNH-LHR
37h 35m1 stop
£446Shenzhen Airlines
Find Deal
Fri, 12 Sep - Sun, 28 Sep
China Southern Logo
21:30 - 10:50LHR-PNH
30h 20m2 stops
China Southern Logo
11:55 - 18:15PNH-LHR
37h 20m1 stop
£475China Southern
Find Deal
Mon, 3 Nov - Sat, 15 Nov
China Southern Logo
21:30 - 14:35LHR-PNH
34h 05m2 stops
China Southern Logo
08:00 - 18:15PNH-LHR
17h 15m1 stop
£476China Southern
Find Deal
Wed, 5 Nov - Wed, 19 Nov
China Southern Logo
21:00 - 00:10LHR-PNH
21h 10m2 stops
China Southern Logo
15:35 - 19:00PNH-LHR
33h 25m1 stop
£478China Southern
Find Deal
Wed, 1 Oct - Wed, 15 Oct
China Southern Logo
21:30 - 10:50LHR-PNH
30h 20m2 stops
China Southern Logo
11:55 - 18:15PNH-LHR
37h 20m1 stop
£481China Southern
Find Deal
Wed, 29 Oct - Fri, 14 Nov

Air China flights from London Heathrow Airport to Phnom Penh

Our best Air China deals on London Heathrow Airport to Phnom Penh flight tickets
Air China
17 Nov
LHR17:40London Heathrow
22h 30m
1 stop
PNH23:10Phnom Penh Pochentong
30 Nov
PNH00:25Phnom Penh Pochentong
24h 25m
1 stop
LHR17:50London Heathrow
£383
Find similar
Air China
3 Nov
LHR17:40London Heathrow
22h 30m
1 stop
PNH23:10Phnom Penh Pochentong
16 Nov
PNH00:25Phnom Penh Pochentong
24h 25m
1 stop
LHR17:50London Heathrow
£404
Find similar
Air China
3 Nov
LHR20:25London Heathrow
19h 45m
1 stop
PNH23:10Phnom Penh Pochentong
16 Nov
PNH00:25Phnom Penh Pochentong
24h 25m
1 stop
LHR17:50London Heathrow
£404
Find similar

Shenzhen Airlines flights from London Heathrow Airport to Phnom Penh

Our best Shenzhen Airlines deals on London Heathrow Airport to Phnom Penh flight tickets
Shenzhen Airlines
13 Oct
LHR22:05London Heathrow
31h 05m
1 stop
PNH11:10Phnom Penh Pochentong
25 Oct
PNH12:15Phnom Penh Pochentong
37h 55m
1 stop
LHR20:10London Heathrow
£442
Find similar
Shenzhen Airlines
15 Sept
LHR22:05London Heathrow
31h 05m
1 stop
PNH11:10Phnom Penh Pochentong
30 Sept
PNH12:15Phnom Penh Pochentong
37h 45m
1 stop
LHR20:00London Heathrow
£445
Find similar
Shenzhen Airlines
12 Sept
LHR22:05London Heathrow
31h 05m
1 stop
PNH11:10Phnom Penh Pochentong
28 Sept
PNH12:15Phnom Penh Pochentong
37h 35m
1 stop
LHR19:50London Heathrow
£446
Find similar

momondo Fare Finder

 
Customise your flight search to find flights from London Heathrow Airport to Phnom Penh 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 1 August 2025.
Use the filters below to find and compare flights from London Heathrow Airport to Phnom Penh that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

Mon 17/11

17:40-23:10

1 stop22h 30m

Phnom Penh Pochentong

Sun 30/11

00:25-17:50

1 stop24h 25m

£383

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

Mon 3/11

17:40-23:10

1 stop22h 30m

Phnom Penh Pochentong

Sun 16/11

00:25-17:50

1 stop24h 25m

£404

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

Mon 3/11

20:25-23:10

1 stop19h 45m

Phnom Penh Pochentong

Sun 16/11

00:25-17:50

1 stop24h 25m

£404

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

Mon 13/10

22:05-11:10

1 stop31h 05m

Phnom Penh Pochentong

Sat 25/10

12:15-20:10

1 stop37h 55m

£442

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

Mon 15/9

22:05-11:10

1 stop31h 05m

Phnom Penh Pochentong

Tue 30/9

12:15-20:00

1 stop37h 45m

£445

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

Fri 12/9

22:05-11:10

1 stop31h 05m

Phnom Penh Pochentong

Sun 28/9

12:15-19:50

1 stop37h 35m

£446

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

Mon 3/11

21:30-10:50

2 stops30h 20m

Phnom Penh Pochentong

Sat 15/11

11:55-18:15

1 stop37h 20m

£475

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

Wed 5/11

21:30-14:35

2 stops34h 05m

Phnom Penh Pochentong

Wed 19/11

08:00-18:15

1 stop17h 15m

£476

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

Wed 1/10

21:00-00:10

2 stops21h 10m

Phnom Penh Pochentong

Wed 15/10

15:35-19:00

1 stop33h 25m

£478

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

Wed 29/10

21:30-10:50

2 stops30h 20m

Phnom Penh Pochentong

Fri 14/11

11:55-18:15

1 stop37h 20m

£481

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
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See travel insights to Phnom Penh from

How to get the cheapest flight ticket from London Heathrow Airport to Phnom Penh

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 Phnom Penh?

The month of March is another great option to travel to Phnom Penh, with average flight prices from London Heathrow Airport averaging around £593.

What is the cheapest day to depart on your flight to Phnom Penh?

Our data shows that Monday is the least expensive day to fly to Phnom Penh. Tickets to fly out on this day can be as low as £627. Be sure to avoid booking your departure on a Friday as prices are generally higher than usual. According to our data, the average ticket price to Phnom Penh on Friday is £730.

What is the cheapest time of day to depart on your flight to Phnom Penh?

Our data shows that the cheapest London Heathrow Airport to Phnom Penh flights are usually those with departure times in the evening. Our users have found flights to Phnom Penh in the evening for as low as £535. At midday is when there is more demand to fly to Phnom Penh, so prices are often more expensive at around £823 per ticket.

How far in advance should I book a flight to Phnom Penh?

You are more likely to see cheaper flights to Phnom Penh from London Heathrow Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to Phnom Penh for around £719 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Phnom Penh from London Heathrow Airport for as low as £619 on momondo.

How have London Heathrow Airport to Phnom Penh flight prices changed over time?

As of August 2025, prices for London Heathrow Airport to Phnom Penh flights are approximately 25% cheaper when compared to flights at the same time last year.

When to book flights from London Heathrow Airport to Phnom Penh

Are you open to changing your travel dates? Check out the ideal times to fly from London Heathrow Airport to Phnom Penh according to our flight data. Find out which month and days have the cheapest flights.
Estimated return price

Cheap London Heathrow Airport to Phnom Penh (LHR to PNH) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from London Heathrow Airport to Phnom Penh

Best price found

£321

Fastest flight time

15h 25m

Direct flights

None

Airports in Phnom Penh

1 airport
The best one-way flight to Phnom Penh from London Heathrow Airport in the past 72 hours is £321. The best return flight deal from London Heathrow Airport to Phnom Penh found on momondo in the last 72 hours is £383.
The fastest flight from London Heathrow Airport to Phnom Penh takes 15h 25m
There are no direct flights from London Heathrow Airport to Phnom Penh. Popular non-direct route for this connection is London Heathrow Airport - Phnom Penh Pochentong Airport.
There is 1 airport near Phnom Penh: Phnom Penh Pochentong (PNH)
Search flight deals

  • How far is London Heathrow to Phnom Penh Pochentong by plane?

    Phnom Penh Pochentong is 6233.8 mi away from London Heathrow. A reasonable flight in good conditions will take 18h 25m.

  • When did momondo last update prices for flights from London Heathrow Airport to Phnom Penh Pochentong Airport?

    Prices for flights from London Heathrow Airport to Phnom Penh Pochentong Airport are updated daily.

  • How many operators does momondo search for flights from London Heathrow Airport to Phnom Penh Pochentong Airport?

  • How old do you have to be to fly from London Heathrow Airport to Phnom Penh Pochentong 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 London Heathrow Airport to Phnom Penh Pochentong Airport.

  • What documentation or ID do you need to fly to Phnom Penh Pochentong Airport?

    The required travel and health documents for your Phnom Penh Pochentong Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Phnom Penh Pochentong Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

  • What is the most popular airline from London Heathrow Airport to Phnom Penh?

Best airlines flying from London Heathrow Airport to Phnom Penh

Compare and see reviews for airlines that fly from London Heathrow Airport to Phnom Penh with momondo
Airline
Rating
Free Cancellation
Price
Shenzhen AirlinesPriceFrom £388Free CancellationRating
6.8
15 reviews
Search Shenzhen Airlines flights
Air ChinaPriceFrom £430Free CancellationRating
7.3
93 reviews
Search Air China flights
China SouthernPriceFrom £436Free CancellationRating
7.6
104 reviews
Search China Southern flights
Etihad AirwaysPriceFrom £525Free CancellationRating
7.4
1,230 reviews
Search Etihad Airways flights
China EasternPriceFrom £572Free CancellationRating
7.2
158 reviews
Search China Eastern flights
Singapore AirlinesPriceFrom £602Free CancellationRating
8.1
1,338 reviews
Search Singapore Airlines flights
Malaysia AirlinesPriceFrom £605Free CancellationRating
7.4
271 reviews
Search Malaysia Airlines flights
British AirwaysPriceFrom £657Free CancellationRating
6.6
7,222 reviews
Search British Airways flights
Vietnam AirlinesPriceFrom £667Free CancellationRating
7.5
197 reviews
Search Vietnam Airlines flights
Cathay PacificPriceFrom £684Free CancellationRating
7.6
949 reviews
Search Cathay Pacific flights

Why use momondo?

Why should I use momondo to find a flight deal from London to Phnom Penh?

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from London to Phnom Penh for you.

Can I find flights from London to Phnom Penh with flexible booking policies on momondo?

All flight searches from London to Phnom Penh on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from London to Phnom Penh?

Once all potential London to Phnom Penh flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from London to Phnom Penh right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of London to Phnom Penh flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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