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Cheap flights from London Heathrow Airport to Phnom Penh from £312

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 20/4. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — PNH
30 Mar — 6 Apr1
1 adult

Cheapflights Tip: The best prices from London Heathrow to Phnom Penh Pochentong are usually found in May or March, booked 67 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 25 March 2025.

Round-trip from

£502

One-way from

£312

Popular in

August

Cheapest in

May

Average price

£604
12/5-22/5
  • 12/5-22/5
  • 4 total stops
  • 52h 40m total
  • London to Phnom Penh
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20/4
  • 20/4
  • 3 total stops
  • 33h 00m total
  • London to Phnom Penh
Search Deals
Highest demand for flights based on searches. 15% potential increase in price (£106 potential increase over avg. return price).
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Cheapest flight prices on average. 3% potential price decrease (£20 potential savings vs. average return price).
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Average for round-trip flights in March 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 25 March 2025.

Thu 6/1120:25LHR - PNH
1 stop19h 45mAir China
Wed 12/1100:25PNH - LHR
1 stop24h 25mAir China
Deal found 25/3£502
Mon 12/510:00LHR - PNH
2 stops26h 15mMultiple Airlines
Thu 22/511:05PNH - LHR
2 stops26h 25mMultiple Airlines
Deal found 25/3£502
Thu 8/521:00LHR - PNH
2 stops21h 10mChina Southern
Thu 15/515:35PNH - LHR
1 stop33h 25mChina Southern
Deal found 23/3£506
Mon 5/521:20LHR - PNH
1 stop19h 55mChina Eastern
Mon 26/500:10PNH - LHR
1 stop24h 30mChina Eastern
Deal found 24/3£541
Mon 14/422:05LHR - PNH
1 stop31h 05mShenzhen Airlines
Thu 1/512:15PNH - LHR
1 stop37h 45mShenzhen Airlines
Deal found 24/3£553
Thu 6/1120:55LHR - PNH
2 stops30h 10mEtihad Airways
Thu 13/1119:25PNH - LHR
2 stops23h 40mEtihad Airways
Deal found 25/3£565
Wed 3/909:25LHR - PNH
1 stop26h 15mSingapore Airlines
Wed 17/918:55PNH - LHR
1 stop30h 35mSingapore Airlines
Deal found 24/3£623
Wed 23/416:00LHR - PNH
2 stops18h 15mBritish Airways
Wed 7/518:20PNH - LHR
1 stop17h 05mBritish Airways
Deal found 24/3£682
Thu 8/519:10LHR - PNH
1 stop15h 45mVietnam Airlines
Thu 29/507:05PNH - LHR
1 stop15h 50mVietnam Airlines
Deal found 24/3£706
Thu 8/511:00LHR - PNH
1 stop24h 25mMalaysia Airlines
Thu 29/518:20PNH - LHR
1 stop17h 35mMalaysia Airlines
Deal found 25/3£707

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 25 March 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 12/5

10:00-18:15

2 stops26h 15m

Phnom Penh Pochentong

Thu 22/5

11:05-07:30

2 stops26h 25m

£502

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

Sat 7/6

20:25-23:05

1 stop20h 40m

Phnom Penh Pochentong

Sat 21/6

00:20-20:30

1 stop26h 10m

£503

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

Thu 8/5

21:00-00:10

2 stops21h 10m

Phnom Penh Pochentong

Thu 15/5

15:35-19:00

1 stop33h 25m

£506

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

Mon 5/5

21:20-23:15

1 stop19h 55m

Phnom Penh Pochentong

Mon 26/5

00:10-18:40

1 stop24h 30m

£541

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

Mon 14/4

22:05-11:10

1 stop31h 05m

Phnom Penh Pochentong

Thu 1/5

12:15-20:00

1 stop37h 45m

£553

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

Wed 3/9

09:25-17:40

1 stop26h 15m

Phnom Penh Pochentong

Wed 17/9

18:55-19:30

1 stop30h 35m

£623

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

Wed 17/9

18:55-13:00

2 stops36h 05m

Phnom Penh Pochentong

Wed 1/10

14:10-16:55

1 stop32h 45m

£679

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

Wed 23/4

16:00-16:15

2 stops18h 15m

Phnom Penh Pochentong

Wed 7/5

18:20-05:25

1 stop17h 05m

£682

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

Sat 6/9

21:10-16:05

1 stop36h 55m

Phnom Penh Pochentong

Sun 21/9

10:50-16:30

1 stop35h 40m

£716

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

Mon 19/5

13:45-16:15

2 stops20h 30m

Phnom Penh Pochentong

Wed 28/5

17:40-13:20

2 stops25h 40m

£728

Flights are sorted by cheapest return flights first.

Deals found on 24/3

Showing 1-10 of 24 results
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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 21 March 2025.

The best time to book flights from London Heathrow Airport to Phnom Penh is 67 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 25 March 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 25 March 2025.
Read reviews from past customers who have flown China Airlines, Singapore Airlines and Emirates 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.
China Airlines
8.2
Very Good
722 reviews
Check prices

Food

7.8

Overall

8.2

Boarding

8.3

Entertainment

8.0

Comfort

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Sopharith,Feb 2025

TPE - PNH

All are excellence, but we had to pay 150$ extra charge each person with our names in passports and tickets. It was just swiping between first names and last names. It might be our mistake when we bought the tickets, but I thought it was expensive just to swipe the names. Anyway, thanks a lot. All excellence
China Airlines
8.2
Very Good
722 reviews
China Airlines
8.2
Very Good
722 reviews
Check prices

Food

7.8

Overall

8.2

Boarding

8.3

Entertainment

8.0

Comfort

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Sopharith,Feb 2025

TPE - PNH

All are excellence, but we had to pay 150$ extra charge each person with our names in passports and tickets. It was just swiping between first names and last names. It might be our mistake when we bought the tickets, but I thought it was expensive just to swipe the names. Anyway, thanks a lot. All excellence
Singapore Airlines
8.1
Very Good
1,284 reviews
China Airlines
8.2
Very Good
722 reviews
Check prices

Food

7.8

Overall

8.2

Boarding

8.3

Entertainment

8.0

Comfort

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Sopharith,Feb 2025

TPE - PNH

All are excellence, but we had to pay 150$ extra charge each person with our names in passports and tickets. It was just swiping between first names and last names. It might be our mistake when we bought the tickets, but I thought it was expensive just to swipe the names. Anyway, thanks a lot. All excellence
Emirates
8.0
Very Good
3,190 reviews
China Airlines
8.2
Very Good
722 reviews
Check prices

Food

7.8

Overall

8.2

Boarding

8.3

Entertainment

8.0

Comfort

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Sopharith,Feb 2025

TPE - PNH

All are excellence, but we had to pay 150$ extra charge each person with our names in passports and tickets. It was just swiping between first names and last names. It might be our mistake when we bought the tickets, but I thought it was expensive just to swipe the names. Anyway, thanks a lot. All excellence
Thai Airways
7.8
Good
316 reviews
China Airlines
8.2
Very Good
722 reviews
Check prices

Food

7.8

Overall

8.2

Boarding

8.3

Entertainment

8.0

Comfort

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Sopharith,Feb 2025

TPE - PNH

All are excellence, but we had to pay 150$ extra charge each person with our names in passports and tickets. It was just swiping between first names and last names. It might be our mistake when we bought the tickets, but I thought it was expensive just to swipe the names. Anyway, thanks a lot. All excellence
Vietnam Airlines
7.6
Good
192 reviews
China Airlines
8.2
Very Good
722 reviews
Check prices

Food

7.8

Overall

8.2

Boarding

8.3

Entertainment

8.0

Comfort

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Sopharith,Feb 2025

TPE - PNH

All are excellence, but we had to pay 150$ extra charge each person with our names in passports and tickets. It was just swiping between first names and last names. It might be our mistake when we bought the tickets, but I thought it was expensive just to swipe the names. Anyway, thanks a lot. All excellence

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 £503, Air China will fly you from London Heathrow Airport to Phnom Penh and back. In addition to Air China, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from China Southern and China Eastern - these airlines can fly you to your destination from £506 and £541, respectively. You may be able to fly from London Heathrow Airport to Phnom Penh for 31% 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 £322. Singapore Airlines flights start at £331 while deals on China Southern start at £361 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 25 March 2025.
AirlineCheapestAverageFlexibilityOn-time
Shenzhen AirlinesCheapest£397Average£469FlexibilityNo cancel feeOn-time63%
Search Shenzhen Airlines flights
China SouthernCheapest£422Average£553FlexibilityNo cancel feeOn-time69%
Search China Southern flights
Air ChinaCheapest£452Average£518FlexibilityNo cancel feeOn-time67%
Search Air China flights
China EasternCheapest£595Average£657FlexibilityNo cancel feeOn-time62%
Search China Eastern flights
Singapore AirlinesCheapest£630Average£730FlexibilityNo cancel feeOn-time81%
Search Singapore Airlines flights
British AirwaysCheapest£670Average£871FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Malaysia AirlinesCheapest£671Average£770FlexibilityNo cancel feeOn-time67%
Search Malaysia Airlines flights
Cathay PacificCheapest£684Average£810FlexibilityNo cancel feeOn-time72%
Search Cathay Pacific flights
Vietnam AirlinesCheapest£701Average£782FlexibilityNo cancel feeOn-time81%
Search Vietnam Airlines flights
Qatar AirwaysCheapest£710Average£892FlexibilityNo cancel feeOn-time68%
Search Qatar Airways flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

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

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Heathrow to Phnom Penh. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

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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