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Cheap flights from London Heathrow Airport to Phnom Penh from £279

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 26/4. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — PNH
23 Apr — 30 Apr1
1 adult

Cheapflights Tip: The best prices from London Heathrow to Phnom Penh Pochentong are usually found in March or November, booked 84 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 18 April 2025.

Round-trip from

£492

One-way from

£279

Popular in

August

Cheapest in

March

Average price

£834
China Southern
  • China Southern
  • 5/5-27/5
  • 3 total stops
  • 54h 10m total
  • London to Phnom Penh
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26/4
  • 26/4
  • 3 total stops
  • 37h 10m total
  • London to Phnom Penh
Search Deals
Highest demand for flights based on searches. 15% potential increase in price (£97 potential increase over avg. return price).
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Cheapest flight prices on average. 3% potential price decrease (£18 potential savings vs. average return price).
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Average for round-trip flights in April 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 18 April 2025.

Mon 5/522:10LHR - PNH
1 stop20h 00mChina Southern
Tue 27/512:05PNH - LHR
2 stops34h 10mChina Southern
Deal found 17/4£492
Fri 6/622:05LHR - PNH
1 stop31h 05mShenzhen Airlines
Sun 6/712:15PNH - LHR
1 stop37h 35mShenzhen Airlines
Deal found 17/4£500
Sun 1/622:05LHR - PNH
1 stop31h 05mMultiple Airlines
Sat 7/600:20PNH - LHR
1 stop26h 10mMultiple Airlines
Deal found 17/4£533
Fri 2/521:20LHR - PNH
1 stop19h 55mChina Eastern
Tue 13/500:10PNH - LHR
1 stop24h 30mChina Eastern
Deal found 17/4£561
Fri 2/520:25LHR - PNH
1 stop20h 40mAir China
Tue 13/500:20PNH - LHR
1 stop26h 10mAir China
Deal found 17/4£563
Thu 8/511:25LHR - PNH
1 stop24h 15mSingapore Airlines
Sun 25/514:05PNH - LHR
1 stop31h 40mSingapore Airlines
Deal found 17/4£645
Thu 8/519:10LHR - PNH
1 stop15h 45mVietnam Airlines
Thu 29/507:05PNH - LHR
1 stop15h 50mVietnam Airlines
Deal found 17/4£672
Sun 1/621:45LHR - PNH
2 stops28h 50mEtihad Airways
Mon 16/619:25PNH - LHR
2 stops23h 20mEtihad Airways
Deal found 17/4£727
Tue 14/1021:35LHR - PNH
1 stop37h 50mMalaysia Airlines
Sat 15/1118:30PNH - LHR
1 stop27h 55mMalaysia Airlines
Deal found 17/4£733
Tue 10/616:00LHR - PNH
2 stops18h 15mQatar Airways
Tue 1/717:40PNH - LHR
2 stops26h 25mQatar Airways
Deal found 17/4£736
Tue 14/1016:50LHR - PNH
2 stops41h 45mEmirates
Wed 19/1120:35PNH - LHR
2 stops24h 15mEmirates
Deal found 17/4£777
Thu 28/809:20LHR - PNH
2 stops18h 55mCathay Pacific
Thu 18/918:30PNH - LHR
1 stop26h 45mCathay Pacific
Deal found 17/4£800

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 18 April 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

Mon 5/5

22:10-00:10

1 stop20h 00m

Phnom Penh Pochentong

Tue 27/5

12:05-16:15

2 stops34h 10m

£492

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

Fri 6/6

22:05-11:10

1 stop31h 05m

Phnom Penh Pochentong

Sun 6/7

12:15-19:50

1 stop37h 35m

£500

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

Sun 1/6

22:05-11:10

1 stop31h 05m

Phnom Penh Pochentong

Sat 7/6

00:20-20:30

1 stop26h 10m

£533

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

Fri 2/5

21:20-23:15

1 stop19h 55m

Phnom Penh Pochentong

Tue 13/5

00:10-18:40

1 stop24h 30m

£561

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

Fri 2/5

20:25-23:05

1 stop20h 40m

Phnom Penh Pochentong

Tue 13/5

00:20-20:30

1 stop26h 10m

£563

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

Mon 1/9

20:35-13:10

1 stop34h 35m

Phnom Penh Pochentong

Mon 15/9

18:55-15:45

1 stop26h 50m

£629

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

Thu 8/5

19:10-16:55

1 stop15h 45m

Phnom Penh Pochentong

Thu 29/5

07:05-16:55

1 stop15h 50m

£672

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

Sun 1/6

21:45-08:35

2 stops28h 50m

Phnom Penh Pochentong

Mon 16/6

19:25-12:45

2 stops23h 20m

£727

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

Tue 14/10

21:35-17:25

1 stop37h 50m

Phnom Penh Pochentong

Thu 20/11

18:30-15:25

1 stop27h 55m

£733

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

Tue 10/6

16:00-16:15

2 stops18h 15m

Phnom Penh Pochentong

Tue 1/7

17:40-14:05

2 stops26h 25m

£736

Flights are sorted by cheapest return flights first.

Deals found on 17/4

Showing 1-10 of 24 results
1
2
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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 11 April 2025.

The best time to book flights from London Heathrow Airport to Phnom Penh is 84 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 18 April 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.

Rainfall in Phnom Penh by month

Plan your trip to Phnom Penh by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Phnom Penh ranges from 0.0 - 250.0 inches per month. October is typically the wettest month, when rainfall can reach 250.0 mm. January is typically the driest time to visit Phnom Penh when rainfall is around 0.0 mm.

Temperature in Phnom Penh by month

Plan your trip to Phnom Penh by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Phnom Penh, use this chart to help with planning. For those seeking warmer temperatures, April is the ideal time of year to visit, when temperatures reach an average of 29.0 C. Travellers hoping to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 25.0 C).

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 18 April 2025.
Read reviews from past customers who have flown Singapore Airlines, Emirates and Thai Airways from London to Phnom Penh. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Singapore Airlines
8.1
Very Good
1,289 reviews
Check prices

Boarding

8.2

Entertainment

8.0

Food

7.7

Crew

8.6

Comfort

7.9

Overall

8.1

Reviews

1 / 20
6.0
Good

Gina,Dec 2024

BLR - SIN

Overall the experience was good. First flight of 17 hours had no entertainment since Singapore airline has technical issues. Was informed that passengers would get a $350 voucher for future flight. Uncertain how that is being distributed but would like to understand if an email is required from my end or if it is an automatic email sent to me by Singapore Airlines. -Gina Robles
Singapore Airlines
8.1
Very Good
1,289 reviews
Singapore Airlines
8.1
Very Good
1,289 reviews
Check prices

Boarding

8.2

Entertainment

8.0

Food

7.7

Crew

8.6

Comfort

7.9

Overall

8.1

Reviews

1 / 20
6.0
Good

Gina,Dec 2024

BLR - SIN

Overall the experience was good. First flight of 17 hours had no entertainment since Singapore airline has technical issues. Was informed that passengers would get a $350 voucher for future flight. Uncertain how that is being distributed but would like to understand if an email is required from my end or if it is an automatic email sent to me by Singapore Airlines. -Gina Robles
Emirates
8.0
Very Good
3,200 reviews
Singapore Airlines
8.1
Very Good
1,289 reviews
Check prices

Boarding

8.2

Entertainment

8.0

Food

7.7

Crew

8.6

Comfort

7.9

Overall

8.1

Reviews

1 / 20
6.0
Good

Gina,Dec 2024

BLR - SIN

Overall the experience was good. First flight of 17 hours had no entertainment since Singapore airline has technical issues. Was informed that passengers would get a $350 voucher for future flight. Uncertain how that is being distributed but would like to understand if an email is required from my end or if it is an automatic email sent to me by Singapore Airlines. -Gina Robles
Thai Airways
7.7
Good
323 reviews
Singapore Airlines
8.1
Very Good
1,289 reviews
Check prices

Boarding

8.2

Entertainment

8.0

Food

7.7

Crew

8.6

Comfort

7.9

Overall

8.1

Reviews

1 / 20
6.0
Good

Gina,Dec 2024

BLR - SIN

Overall the experience was good. First flight of 17 hours had no entertainment since Singapore airline has technical issues. Was informed that passengers would get a $350 voucher for future flight. Uncertain how that is being distributed but would like to understand if an email is required from my end or if it is an automatic email sent to me by Singapore Airlines. -Gina Robles
Vietnam Airlines
7.6
Good
194 reviews
Singapore Airlines
8.1
Very Good
1,289 reviews
Check prices

Boarding

8.2

Entertainment

8.0

Food

7.7

Crew

8.6

Comfort

7.9

Overall

8.1

Reviews

1 / 20
6.0
Good

Gina,Dec 2024

BLR - SIN

Overall the experience was good. First flight of 17 hours had no entertainment since Singapore airline has technical issues. Was informed that passengers would get a $350 voucher for future flight. Uncertain how that is being distributed but would like to understand if an email is required from my end or if it is an automatic email sent to me by Singapore Airlines. -Gina Robles
Cathay Pacific
7.5
Good
849 reviews
Singapore Airlines
8.1
Very Good
1,289 reviews
Check prices

Boarding

8.2

Entertainment

8.0

Food

7.7

Crew

8.6

Comfort

7.9

Overall

8.1

Reviews

1 / 20
6.0
Good

Gina,Dec 2024

BLR - SIN

Overall the experience was good. First flight of 17 hours had no entertainment since Singapore airline has technical issues. Was informed that passengers would get a $350 voucher for future flight. Uncertain how that is being distributed but would like to understand if an email is required from my end or if it is an automatic email sent to me by Singapore Airlines. -Gina Robles

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 12 different airlines.

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

    Currently priced at £492, 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 China Eastern - these airlines can fly you to your destination from £500 and £561, respectively. You may be able to fly from London Heathrow Airport to Phnom Penh for 32% 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 £321. Singapore Airlines flights start at £338 while deals on Air China start at £353 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

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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 18 April 2025.
AirlineCheapestAverageFlexibilityOn-time
Shenzhen AirlinesCheapest£388Average£459FlexibilityNo cancel feeOn-time63%
Search Shenzhen Airlines flights
Air ChinaCheapest£441Average£504FlexibilityNo cancel feeOn-time67%
Search Air China flights
China SouthernCheapest£451Average£559FlexibilityNo cancel feeOn-time69%
Search China Southern flights
China EasternCheapest£581Average£642FlexibilityNo cancel feeOn-time62%
Search China Eastern flights
Singapore AirlinesCheapest£613Average£713FlexibilityNo cancel feeOn-time81%
Search Singapore Airlines flights
Malaysia AirlinesCheapest£656Average£752FlexibilityNo cancel feeOn-time67%
Search Malaysia Airlines flights
British AirwaysCheapest£657Average£861FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Cathay PacificCheapest£668Average£788FlexibilityNo cancel feeOn-time72%
Search Cathay Pacific flights
Vietnam AirlinesCheapest£685Average£764FlexibilityNo cancel feeOn-time81%
Search Vietnam Airlines flights
Qatar AirwaysCheapest£711Average£848FlexibilityNo cancel feeOn-time68%
Search Qatar Airways flights

Fly with Cheapflights

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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.

Can Cheapflights find flights from Heathrow to Phnom Penh with no change fees?

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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