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Cheap flights from London Heathrow Airport to Phnom Penh from £854

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 29/9. 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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Find the cheapest flights from London Heathrow Airport to Phnom Penh

Cheap return flights

Enter your travel dates to find the best prices.
British Airways Logo
19:25 - 10:00
LHR
-
PNH
32h 35m
2 stops
British Airways Logo
18:20 - 05:25
PNH
-
LHR
17h 05m
1 stop
£950British Airways
Fri, 9 Oct - Fri, 23 Oct
British Airways Logo
21:30 - 10:00
LHR
-
PNH
30h 30m
1 stop
British Airways Logo
18:20 - 05:25
PNH
-
LHR
17h 05m
1 stop
£1,276British Airways
Fri, 9 Oct - Fri, 23 Oct
British Airways Logo
19:25 - 10:00
LHR
-
PNH
32h 35m
2 stops
British Airways Logo
18:20 - 05:25
PNH
-
LHR
17h 05m
1 stop
£1,815British Airways
Thu, 9 Jul - Thu, 23 Jul
British Airways Logo
21:30 - 10:00
LHR
-
PNH
30h 30m
1 stop
British Airways Logo
18:20 - 05:25
PNH
-
LHR
17h 05m
1 stop
£1,949British Airways
Thu, 9 Jul - Thu, 23 Jul
British Airways Logo
19:25 - 10:00
LHR
-
PNH
32h 35m
2 stops
British Airways Logo
18:20 - 05:25
PNH
-
LHR
17h 05m
1 stop
£2,005British Airways
Fri, 10 Jul - Fri, 24 Jul
British Airways Logo
21:30 - 10:00
LHR
-
PNH
30h 30m
1 stop
British Airways Logo
18:20 - 05:25
PNH
-
LHR
17h 05m
1 stop
£2,235British Airways
Fri, 10 Jul - Fri, 24 Jul

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 10 May 2026.
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

Cheapest return flight

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

Fri 9/10

19:25-10:00

2 stops32h 35m

Phnom Penh Pochentong

Fri 23/10

18:20-05:25

1 stop17h 05m

£950
Fastest return journey

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

Fri 9/10

21:30-10:00

1 stop30h 30m

Phnom Penh Pochentong

Fri 23/10

18:20-05:25

1 stop17h 05m

£1,276

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

Thu 9/7

19:25-10:00

2 stops32h 35m

Phnom Penh Pochentong

Thu 23/7

18:20-05:25

1 stop17h 05m

£1,815

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

Thu 9/7

21:30-10:00

1 stop30h 30m

Phnom Penh Pochentong

Thu 23/7

18:20-05:25

1 stop17h 05m

£1,949

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

Fri 10/7

19:25-10:00

2 stops32h 35m

Phnom Penh Pochentong

Fri 24/7

18:20-05:25

1 stop17h 05m

£2,005

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

Fri 10/7

21:30-10:00

1 stop30h 30m

Phnom Penh Pochentong

Fri 24/7

18:20-05:25

1 stop17h 05m

£2,235
Cheapest one-way
Fastest single journey

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

Tue 29/9

21:30-10:00

1 stop30h 30m

£854

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

Wed 22/7

19:25-10:00

2 stops32h 35m

£1,204

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

Wed 22/7

21:30-10:00

1 stop30h 30m

£1,725

Flights are sorted by cheapest return flights first.

Sorted by cheapest first

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 typical price of a round-trip flight between London Heathrow Airport and Phnom Penh?

What is the cheapest month to fly to Phnom Penh?

The month of November is another great option to travel to Phnom Penh, with average flight prices from London Heathrow Airport averaging around £578.

How far in advance should I book a flight from London Heathrow Airport 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 £692 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 £579 on momondo.

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

As of May 2026, prices for London Heathrow Airport to Phnom Penh flights are approximately 30% more expensive 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

Fastest flight time

32h 35m

Direct flights

None
The fastest flight from London Heathrow Airport to Phnom Penh takes 32h 35m
There are no direct flights from London Heathrow Airport to Phnom Penh. There are no popular flight routes from London Heathrow Airport to Phnom Penh.
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Frequently asked questions about flying from London Heathrow Airport to Phnom Penh

  • 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 32h 35m.

  • 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
Air ChinaPriceFrom £380Free CancellationRating
7.3
149 reviews
Search Air China flights
China SouthernPriceFrom £386Free CancellationRating
7.4
151 reviews
Search China Southern flights
Shenzhen AirlinesPriceFrom £409Free CancellationRating
7.8
25 reviews
Search Shenzhen Airlines flights
Etihad AirwaysPriceFrom £506Free CancellationRating
7.3
1,435 reviews
Search Etihad Airways flights
Malaysia AirlinesPriceFrom £582Free CancellationRating
7.4
307 reviews
Search Malaysia Airlines flights
Singapore AirlinesPriceFrom £606Free CancellationRating
8.2
1,510 reviews
Search Singapore Airlines flights
Qatar AirwaysPriceFrom £687Free CancellationRating
7.4
3,728 reviews
Search Qatar Airways flights
British AirwaysPriceFrom £700Free CancellationRating
6.7
7,969 reviews
Search British Airways flights
Thai AirwaysPriceFrom £755Free CancellationRating
7.9
401 reviews
Search Thai Airways flights
Cathay PacificPriceFrom £757Free CancellationRating
7.6
1,326 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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