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Cheap flights from London Heathrow Airport to Phnom Penh from £318

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 31/8. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — PNH
16 Jul — 23 Jul1
1 adult

Cheapflights Tip: The best prices from London Heathrow to Phnom Penh Pochentong are usually found in November or March, booked 63 days in advance, depart on a Monday or Saturday and return on a Wednesday

Cheap flight deals from Heathrow to Phnom Penh

Discover tips and strategies to find the most affordable flight options for your journey from Heathrow (LHR) to Phnom Penh (PNH). 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 11 July 2025.

Round-trip from

£551

One-way from

£318

Popular in

August

Cheapest in

November

Average price

£923
China Southern
  • China Southern
  • 4/10-30/11
  • 2 total stops
  • 51h 35m total
  • London to Phnom Penh
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Shenzhen Airlines
  • Shenzhen Airlines
  • 31/8
  • 1 total stop
  • 31h 05m total
  • London to Phnom Penh
Search Deals
Highest demand for flights based on searches. 14% potential increase in price (£88 potential increase over avg. return price).
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Cheapest flight prices on average. 3% potential price decrease (£16 potential savings vs. average return price).
Search Deals
Average for round-trip flights in July 2025
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Find flight deals from Heathrow to Phnom Penh

Cheapest flights from Heathrow to Phnom Penh
Explore the most affordable flight options available from Heathrow to Phnom Penh. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 11 July 2025.

Sat 4/1022:10LHR - PNH
1 stop34h 20mChina Southern
Sun 30/1108:00PNH - LHR
1 stop17h 15mChina Southern
Deal found 11/7£551
Sat 30/822:05LHR - PNH
1 stop31h 05mShenzhen Airlines
Tue 30/912:15PNH - LHR
1 stop37h 45mShenzhen Airlines
Deal found 9/7£555
Mon 1/1220:25LHR - PNH
2 stops31h 15mAir China
Sat 13/1211:40PNH - LHR
2 stops35h 15mAir China
Deal found 10/7£560
Wed 15/1022:05LHR - PNH
1 stop31h 05mMultiple Airlines
Tue 25/1100:15PNH - LHR
1 stop24h 15mMultiple Airlines
Deal found 11/7£564
Sun 16/1121:00LHR - PNH
2 stops54h 00mChina Eastern
Wed 26/1100:15PNH - LHR
1 stop24h 15mChina Eastern
Deal found 10/7£592

Cheapflights Fare Finder

Customise your flight search to find flights from Heathrow 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, Cheapflights users made 858,174 searches. Data last updated 11 July 2025.
Use the filters below to find and compare flights from London Heathrow Airport to Phnom Penh that are best for you.

Fly from

Heathrow

Fly to

Phnom Penh

Route

Depart

Return

Price

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

Sat 4/10

22:10-14:30

1 stop34h 20m

Phnom Penh Pochentong

Sun 30/11

08:00-18:15

1 stop17h 15m

£551

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

Sat 30/8

22:05-11:10

1 stop31h 05m

Phnom Penh Pochentong

Tue 30/9

12:15-20:00

1 stop37h 45m

£555

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

Sat 4/10

22:40-23:05

1 stop18h 25m

Phnom Penh Pochentong

Mon 3/11

00:25-15:55

1 stop22h 30m

£576

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

Mon 6/10

20:50-17:25

2 stops38h 35m

Phnom Penh Pochentong

Sat 18/10

08:30-07:00

1 stop28h 30m

£578

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

Tue 2/9

11:00-17:25

1 stop24h 25m

Phnom Penh Pochentong

Wed 1/10

18:20-16:35

1 stop28h 15m

£650

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

Tue 2/9

09:05-16:35

2 stops25h 30m

Phnom Penh Pochentong

Wed 1/10

20:50-20:15

2 stops29h 25m

£733

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

Sun 31/8

22:05-11:10

1 stop31h 05m

£318

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

Sun 31/8

19:05-08:55

3 stops55h 50m

£364

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

Tue 23/9

22:10-14:30

1 stop34h 20m

£383

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

Sun 31/8

21:20-11:35

2 stops32h 15m

£386

Flights are sorted by cheapest return flights first.

Deals found on 10/7

Showing 1-10 of 15 results
1
2

Best time to book a flight from Heathrow to Phnom Penh

Have a flexible travel schedule? Discover the best time to fly to Phnom Penh from Heathrow 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 Heathrow Airport to Phnom Penh

How far ahead should I book a flight from London Heathrow Airport to Phnom Penh?

Use this chart to determine the optimal time to book a return flight from Heathrow to Phnom Penh. Price data was last updated on 27 June 2025.

The best time to book flights from London Heathrow Airport to Phnom Penh is 63 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest month to book a flight from London Heathrow Airport to Phnom Penh?

Currently, September is the cheapest month in which you can book a flight from London Heathrow Airport to Phnom Penh (average of £689). Flying from London Heathrow Airport to Phnom Penh in July is currently the most expensive (average of £1,232). 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.

What is the cheapest time of day to fly from LHR to PNH?

Find hourly flight availability from Heathrow to Phnom Penh. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 11 July 2025.

When flying from London Heathrow Airport to Phnom Penh, the time of day you fly usually plays a role in the price. Save by searching for a flight in the evening, which can drop the price by up to 39% versus a flight at midday.

What is the cheapest day to fly from London Heathrow Airport to Phnom Penh?

Use this chart to determine the cheapest time to fly return from Heathrow to Phnom Penh. Price data was last updated on 16 December 2024.

Travellers seeking maximum savings on their London Heathrow Airport to Phnom Penh flight should consider departing on Monday evenings when fares are most often at their lowest. Friday at midday flights should be avoided if possible as fares are typically the most expensive at this time.

How much does it cost for a return flight from London Heathrow Airport to Phnom Penh?

Reviews of airlines servicing Phnom Penh

Get insights into the airlines that provide service to Phnom Penh. 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 Phnom Penh. Reviews last updated 11 July 2025.
Read through reviews of airlines operating flights from London Heathrow Airport to Phnom Penh, such as Emirates, China Southern, andQatar Airways. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Emirates
8.1
Very Good
3,285 reviews
Check prices

Crew

8.3

Food

7.8

Comfort

8.0

Boarding

8.1

Entertainment

8.2

Overall

8.1

Reviews

1 / 20
2.0
Mediocre

Hemshika,Jun 2025

DXB - LGW

It was not good. As soon as we entered the plane, 2 girls in front of us bend their seats down completely and startes sleeping within the next 2 minutes. I asked one of the air hostess to ask the girls to make them sit straight because we just entered the plane and we wanted to sit properly put our seat belts etc. The air hostess replied to me in the EK 009 plane that it's her right she can bend it but when we take off, she will have to straighten her seat. She never did because the air hostess never told her. The girls left their seats bent down and I had to intervene to ask them to straighten their seats because we had to eat. The girls kept telling us to please eat fast so they can bend down. What rubbish is this. Pressure to eat for their comfort and our discomfort.
Emirates
8.1
Very Good
3,285 reviews
Emirates
8.1
Very Good
3,285 reviews
Check prices

Crew

8.3

Food

7.8

Comfort

8.0

Boarding

8.1

Entertainment

8.2

Overall

8.1

Reviews

1 / 20
2.0
Mediocre

Hemshika,Jun 2025

DXB - LGW

It was not good. As soon as we entered the plane, 2 girls in front of us bend their seats down completely and startes sleeping within the next 2 minutes. I asked one of the air hostess to ask the girls to make them sit straight because we just entered the plane and we wanted to sit properly put our seat belts etc. The air hostess replied to me in the EK 009 plane that it's her right she can bend it but when we take off, she will have to straighten her seat. She never did because the air hostess never told her. The girls left their seats bent down and I had to intervene to ask them to straighten their seats because we had to eat. The girls kept telling us to please eat fast so they can bend down. What rubbish is this. Pressure to eat for their comfort and our discomfort.
China Southern
7.6
Good
103 reviews
Emirates
8.1
Very Good
3,285 reviews
Check prices

Crew

8.3

Food

7.8

Comfort

8.0

Boarding

8.1

Entertainment

8.2

Overall

8.1

Reviews

1 / 20
2.0
Mediocre

Hemshika,Jun 2025

DXB - LGW

It was not good. As soon as we entered the plane, 2 girls in front of us bend their seats down completely and startes sleeping within the next 2 minutes. I asked one of the air hostess to ask the girls to make them sit straight because we just entered the plane and we wanted to sit properly put our seat belts etc. The air hostess replied to me in the EK 009 plane that it's her right she can bend it but when we take off, she will have to straighten her seat. She never did because the air hostess never told her. The girls left their seats bent down and I had to intervene to ask them to straighten their seats because we had to eat. The girls kept telling us to please eat fast so they can bend down. What rubbish is this. Pressure to eat for their comfort and our discomfort.
Qatar Airways
7.4
Good
3,596 reviews
Emirates
8.1
Very Good
3,285 reviews
Check prices

Crew

8.3

Food

7.8

Comfort

8.0

Boarding

8.1

Entertainment

8.2

Overall

8.1

Reviews

1 / 20
2.0
Mediocre

Hemshika,Jun 2025

DXB - LGW

It was not good. As soon as we entered the plane, 2 girls in front of us bend their seats down completely and startes sleeping within the next 2 minutes. I asked one of the air hostess to ask the girls to make them sit straight because we just entered the plane and we wanted to sit properly put our seat belts etc. The air hostess replied to me in the EK 009 plane that it's her right she can bend it but when we take off, she will have to straighten her seat. She never did because the air hostess never told her. The girls left their seats bent down and I had to intervene to ask them to straighten their seats because we had to eat. The girls kept telling us to please eat fast so they can bend down. What rubbish is this. Pressure to eat for their comfort and our discomfort.
Etihad Airways
7.4
Good
1,222 reviews
Emirates
8.1
Very Good
3,285 reviews
Check prices

Crew

8.3

Food

7.8

Comfort

8.0

Boarding

8.1

Entertainment

8.2

Overall

8.1

Reviews

1 / 20
2.0
Mediocre

Hemshika,Jun 2025

DXB - LGW

It was not good. As soon as we entered the plane, 2 girls in front of us bend their seats down completely and startes sleeping within the next 2 minutes. I asked one of the air hostess to ask the girls to make them sit straight because we just entered the plane and we wanted to sit properly put our seat belts etc. The air hostess replied to me in the EK 009 plane that it's her right she can bend it but when we take off, she will have to straighten her seat. She never did because the air hostess never told her. The girls left their seats bent down and I had to intervene to ask them to straighten their seats because we had to eat. The girls kept telling us to please eat fast so they can bend down. What rubbish is this. Pressure to eat for their comfort and our discomfort.
Malaysia Airlines
7.4
Good
266 reviews
Emirates
8.1
Very Good
3,285 reviews
Check prices

Crew

8.3

Food

7.8

Comfort

8.0

Boarding

8.1

Entertainment

8.2

Overall

8.1

Reviews

1 / 20
2.0
Mediocre

Hemshika,Jun 2025

DXB - LGW

It was not good. As soon as we entered the plane, 2 girls in front of us bend their seats down completely and startes sleeping within the next 2 minutes. I asked one of the air hostess to ask the girls to make them sit straight because we just entered the plane and we wanted to sit properly put our seat belts etc. The air hostess replied to me in the EK 009 plane that it's her right she can bend it but when we take off, she will have to straighten her seat. She never did because the air hostess never told her. The girls left their seats bent down and I had to intervene to ask them to straighten their seats because we had to eat. The girls kept telling us to please eat fast so they can bend down. What rubbish is this. Pressure to eat for their comfort and our discomfort.

Related info for your journey

Find useful and relevant information for your journey from Heathrow to Phnom Penh. 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 Phnom Penh from London Heathrow?

    Located just 5.0 mi from the city center, Phnom Penh Pochentong is the airport most travelers will use when flying to Phnom Penh from London Heathrow. Booking flights from London Heathrow to Pochentong (PNH) should be relatively easy as there are 0 daily inbound flights from London Heathrow from 13 different airlines.

  • What are the cheapest airlines flying from London Heathrow Airport to Phnom Penh round-trip?

    Currently priced at £551, China Southern will fly you from London Heathrow Airport to Phnom Penh and back. In addition to China Southern, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Shenzhen Airlines and Air China - these airlines can fly you to your destination from £555 and £576, respectively. You may be able to fly from London Heathrow Airport to Phnom Penh for 21% less than the average price by searching for these airlines.

  • What are the cheapest airlines to fly from London Heathrow Airport to Phnom Penh one-way?

    To fly one-way, consider booking your trip with Shenzhen Airlines, which is currently one of the cheapest options available, starting at £318. China Southern flights start at £383 while deals on China Eastern start at £386 one-way.

  • Can I find deals for flights from Heathrow to Phnom Penh that include hotel bookings?

    Yes. In addition to deals on Heathrow to Phnom Penh flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Heathrow to Phnom Penh?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Heathrow to Phnom Penh.

  • Can I find deals for business class flights from Heathrow to Phnom Penh?

    Yes. Cheapflights offers flight deals from Heathrow to Phnom Penh 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 Heathrow Airport to Phnom Penh?

    Currently, September is the cheapest month in which you can book a flight from London Heathrow Airport to Phnom Penh (average of £689). Flying from London Heathrow Airport to Phnom Penh in July is currently the most expensive (average of £1,232). 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

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Top 10 airlines flying from Heathrow to Phnom Penh

Discover the top 10 airlines that operate flights from Heathrow to Phnom Penh. 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 11 July 2025.
AirlineCheapestAverageFlexibilityOn-time
Shenzhen AirlinesCheapest£378Average£451FlexibilityNo cancel feeOn-time63%
Search Shenzhen Airlines flights
Air ChinaCheapest£422Average£492FlexibilityNo cancel feeOn-time67%
Search Air China flights
China SouthernCheapest£428Average£538FlexibilityNo cancel feeOn-time69%
Search China Southern flights
Etihad AirwaysCheapest£512Average£589FlexibilityNo cancel feeOn-time75%
Search Etihad Airways flights
China EasternCheapest£557Average£625FlexibilityNo cancel feeOn-time62%
Search China Eastern flights
Singapore AirlinesCheapest£586Average£696FlexibilityNo cancel feeOn-time81%
Search Singapore Airlines flights
Malaysia AirlinesCheapest£589Average£705FlexibilityNo cancel feeOn-time67%
Search Malaysia Airlines flights
British AirwaysCheapest£640Average£812FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Vietnam AirlinesCheapest£650Average£742FlexibilityNo cancel feeOn-time81%
Search Vietnam Airlines flights
Cathay PacificCheapest£666Average£785FlexibilityNo cancel feeOn-time72%
Search Cathay Pacific flights

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How does Cheapflights help users find flights from Heathrow to Phnom Penh?

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Why should you use Cheapflights to find cheap flight tickets from Heathrow to Phnom Penh?

By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to Phnom Penh from Heathrow.

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Yes! Cheapflights helps users easily find flights from Heathrow to Phnom Penh with no change fees.

Can Cheapflights notify me if prices for flights from Heathrow to Phnom Penh become cheaper?

Not ready to book yet? You can track prices for flights from Heathrow to Phnom Penh on Cheapflights with our Price Alert feature and get notified when better prices are available.

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