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Cheap flights from London Heathrow Airport to Phnom Penh from £316

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 1/10. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — PNH
18 jun — 25 jun1
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 13 junho 2025.

Round-trip from

£506

One-way from

£316

Popular in

August

Cheapest in

November

Average price

£605
Etihad Airways
  • Etihad Airways
  • 3/11-17/11
  • 2 total stops
  • 49h 45m total
  • London to Phnom Penh
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Shenzhen Airlines
  • Shenzhen Airlines
  • 1/10
  • 1 total stop
  • 31h 05m total
  • London to Phnom Penh
Search Deals
Highest demand for flights based on searches. 14% potential increase in price (£90 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 June 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 13 junho 2025.

seg 3/1120:55LHR - PNH
1 stop14h 35mEtihad Airways
seg 17/1107:55PNH - LHR
1 stop35h 10mEtihad Airways
Deal found 11/6£506
seg 16/622:05LHR - PNH
1 stop31h 05mShenzhen Airlines
dom 22/612:15PNH - LHR
1 stop37h 35mShenzhen Airlines
Deal found 11/6£509
sáb 1/1121:30LHR - PNH
2 stops34h 05mChina Southern
sáb 15/1115:50PNH - LHR
1 stop33h 25mChina Southern
Deal found 11/6£511
dom 15/621:20LHR - PNH
1 stop19h 55mChina Eastern
dom 22/612:40PNH - LHR
2 stops60h 00mChina Eastern
Deal found 11/6£562
sex 7/1121:10LHR - PNH
1 stop31h 05mMultiple Airlines
dom 23/1100:15PNH - LHR
1 stop24h 15mMultiple Airlines
Deal found 12/6£564
qua 26/1120:25LHR - PNH
1 stop19h 45mAir China
qua 25/300:25PNH - LHR
1 stop22h 30mAir China
Deal found 12/6£581
sex 5/1210:25LHR - PNH
1 stop16h 25mMalaysia Airlines
qui 15/118:30PNH - LHR
1 stop18h 05mMalaysia Airlines
Deal found 11/6£591
sáb 1/1111:00LHR - PNH
1 stop22h 40mVietnam Airlines
sáb 15/1117:30PNH - LHR
2 stops20h 45mVietnam Airlines
Deal found 13/6£731
sáb 1/1113:05LHR - PNH
2 stops19h 20mBritish Airways
dom 16/1118:30PNH - LHR
1 stop17h 50mBritish Airways
Deal found 12/6£748

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 13 junho 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

seg 3/11

20:55-18:30

1 stop14h 35m

Phnom Penh Pochentong

seg 17/11

07:55-12:05

1 stop35h 10m

£506

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

sáb 1/11

21:30-14:35

2 stops34h 05m

Phnom Penh Pochentong

sáb 15/11

15:50-18:15

1 stop33h 25m

£511

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

sex 7/11

21:10-11:15

1 stop31h 05m

Phnom Penh Pochentong

dom 23/11

00:15-17:30

1 stop24h 15m

£564

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

sáb 20/9

22:05-11:10

1 stop31h 05m

Phnom Penh Pochentong

sáb 27/9

12:15-20:00

1 stop37h 45m

£567

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

qua 26/11

20:25-23:10

1 stop19h 45m

Phnom Penh Pochentong

qua 25/3

00:25-15:55

1 stop22h 30m

£581

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

sex 5/12

10:25-09:50

1 stop16h 25m

Phnom Penh Pochentong

qui 15/1

18:30-05:35

1 stop18h 05m

£591

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

qua 2/7

21:20-11:35

2 stops32h 15m

Phnom Penh Pochentong

seg 7/7

00:10-18:40

1 stop24h 30m

£698

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

sáb 1/11

11:00-16:40

1 stop22h 40m

Phnom Penh Pochentong

sáb 15/11

17:30-07:15

2 stops20h 45m

£731

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

sáb 1/11

13:05-15:25

2 stops19h 20m

Phnom Penh Pochentong

dom 16/11

18:30-05:20

1 stop17h 50m

£748

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

seg 18/8

16:00-16:15

1 stop18h 15m

Phnom Penh Pochentong

qui 18/9

17:40-07:30

1 stop19h 50m

£766

Flights are sorted by cheapest return flights first.

Deals found on 11/6

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 9 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 £1,203). 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 13 junho 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 13 junho 2025.
Read reviews from past customers who have flown Emirates, Singapore Airlines and Austrian Airlines 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.
Emirates
8.1
Very Good
3,265 reviews
Check prices

Boarding

8.1

Comfort

8.0

Entertainment

8.2

Overall

8.1

Food

7.8

Crew

8.3

Reviews

1 / 20
10.0
Excellent

Steven,Feb 2025

GLA - DXB

Although I was in economy it made no difference where the staff were concerned they were attentive and pleasant throughout the flight maybe one day I'll get the chance to see if there's a difference in business or 1st class service but in truth for the way I was treated I can only see the menu being an upgrade as the staff don't need upgrading and are indeed the biggest asset on a long journey a credit to the company.
Emirates
8.1
Very Good
3,265 reviews
Emirates
8.1
Very Good
3,265 reviews
Check prices

Boarding

8.1

Comfort

8.0

Entertainment

8.2

Overall

8.1

Food

7.8

Crew

8.3

Reviews

1 / 20
10.0
Excellent

Steven,Feb 2025

GLA - DXB

Although I was in economy it made no difference where the staff were concerned they were attentive and pleasant throughout the flight maybe one day I'll get the chance to see if there's a difference in business or 1st class service but in truth for the way I was treated I can only see the menu being an upgrade as the staff don't need upgrading and are indeed the biggest asset on a long journey a credit to the company.
Singapore Airlines
8.1
Very Good
1,304 reviews
Emirates
8.1
Very Good
3,265 reviews
Check prices

Boarding

8.1

Comfort

8.0

Entertainment

8.2

Overall

8.1

Food

7.8

Crew

8.3

Reviews

1 / 20
10.0
Excellent

Steven,Feb 2025

GLA - DXB

Although I was in economy it made no difference where the staff were concerned they were attentive and pleasant throughout the flight maybe one day I'll get the chance to see if there's a difference in business or 1st class service but in truth for the way I was treated I can only see the menu being an upgrade as the staff don't need upgrading and are indeed the biggest asset on a long journey a credit to the company.
Austrian Airlines
7.6
Good
802 reviews
Emirates
8.1
Very Good
3,265 reviews
Check prices

Boarding

8.1

Comfort

8.0

Entertainment

8.2

Overall

8.1

Food

7.8

Crew

8.3

Reviews

1 / 20
10.0
Excellent

Steven,Feb 2025

GLA - DXB

Although I was in economy it made no difference where the staff were concerned they were attentive and pleasant throughout the flight maybe one day I'll get the chance to see if there's a difference in business or 1st class service but in truth for the way I was treated I can only see the menu being an upgrade as the staff don't need upgrading and are indeed the biggest asset on a long journey a credit to the company.
Cathay Pacific
7.6
Good
892 reviews
Emirates
8.1
Very Good
3,265 reviews
Check prices

Boarding

8.1

Comfort

8.0

Entertainment

8.2

Overall

8.1

Food

7.8

Crew

8.3

Reviews

1 / 20
10.0
Excellent

Steven,Feb 2025

GLA - DXB

Although I was in economy it made no difference where the staff were concerned they were attentive and pleasant throughout the flight maybe one day I'll get the chance to see if there's a difference in business or 1st class service but in truth for the way I was treated I can only see the menu being an upgrade as the staff don't need upgrading and are indeed the biggest asset on a long journey a credit to the company.
SWISS
7.5
Good
1,624 reviews
Emirates
8.1
Very Good
3,265 reviews
Check prices

Boarding

8.1

Comfort

8.0

Entertainment

8.2

Overall

8.1

Food

7.8

Crew

8.3

Reviews

1 / 20
10.0
Excellent

Steven,Feb 2025

GLA - DXB

Although I was in economy it made no difference where the staff were concerned they were attentive and pleasant throughout the flight maybe one day I'll get the chance to see if there's a difference in business or 1st class service but in truth for the way I was treated I can only see the menu being an upgrade as the staff don't need upgrading and are indeed the biggest asset on a long journey a credit to the company.

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 £506, Etihad Airways will fly you from London Heathrow Airport to Phnom Penh and back. In addition to Etihad Airways, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from China Southern and Shenzhen Airlines - these airlines can fly you to your destination from £511 and £567, respectively. You may be able to fly from London Heathrow Airport to Phnom Penh for 27% 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 £316. Air China flights start at £373 while deals on China Southern start at £376 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 £1,203). 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 13 junho 2025.
AirlineCheapestAverageFlexibilityOn-time
Shenzhen AirlinesCheapest£378Average£455FlexibilityNo cancel feeOn-time63%
Search Shenzhen Airlines flights
Air ChinaCheapest£421Average£490FlexibilityNo cancel feeOn-time67%
Search Air China flights
China SouthernCheapest£430Average£543FlexibilityNo 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£589Average£697FlexibilityNo cancel feeOn-time81%
Search Singapore Airlines flights
Malaysia AirlinesCheapest£590Average£718FlexibilityNo cancel feeOn-time67%
Search Malaysia Airlines flights
British AirwaysCheapest£640Average£824FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Vietnam AirlinesCheapest£650Average£742FlexibilityNo cancel feeOn-time81%
Search Vietnam Airlines flights
Cathay PacificCheapest£651Average£771FlexibilityNo cancel feeOn-time72%
Search Cathay Pacific 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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