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Cheap flights from London Heathrow Airport to Phnom Penh

LHR — PNH
21 Nov — 28 Nov1
1 adult
1 adult, Economy

Cheapflights Tip: The best prices from London Heathrow to Phnom Penh Pochentong are usually found in November or May, booked 36 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 22 October 2025.

Popular in

July

Cheapest in

November

Average price

£604
Highest demand for flights based on searches. 16% potential increase in price (£103 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 October 2025
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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 17 October 2025.

The best time to book flights from London Heathrow Airport to Phnom Penh is 36 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 £395). Flying from London Heathrow Airport to Phnom Penh in July is currently the most expensive (average of £687). 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 22 October 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 38% 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.

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 22 October 2025.
Read through reviews of airlines operating flights from London Heathrow Airport to Phnom Penh, such as Thai Airways, Etihad Airways, andChina Southern. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Thai Airways
7.8
Good
360 reviews
Check prices

Comfort

7.6

Overall

7.8

Crew

8.3

Food

7.3

Boarding

7.9

Entertainment

6.9

Reviews

1 / 18
10.0
Excellent

Joe,Jun 2025

BKK - TPE

The flight was very comfortable, and I really appreciated that each seat had an electric outlet to charge devices. The staff was great.
Thai Airways
7.8
Good
360 reviews
Thai Airways
7.8
Good
360 reviews
Check prices

Comfort

7.6

Overall

7.8

Crew

8.3

Food

7.3

Boarding

7.9

Entertainment

6.9

Reviews

1 / 18
10.0
Excellent

Joe,Jun 2025

BKK - TPE

The flight was very comfortable, and I really appreciated that each seat had an electric outlet to charge devices. The staff was great.
Etihad Airways
7.4
Good
1,282 reviews
Thai Airways
7.8
Good
360 reviews
Check prices

Comfort

7.6

Overall

7.8

Crew

8.3

Food

7.3

Boarding

7.9

Entertainment

6.9

Reviews

1 / 18
10.0
Excellent

Joe,Jun 2025

BKK - TPE

The flight was very comfortable, and I really appreciated that each seat had an electric outlet to charge devices. The staff was great.
China Southern
7.4
Good
116 reviews
Thai Airways
7.8
Good
360 reviews
Check prices

Comfort

7.6

Overall

7.8

Crew

8.3

Food

7.3

Boarding

7.9

Entertainment

6.9

Reviews

1 / 18
10.0
Excellent

Joe,Jun 2025

BKK - TPE

The flight was very comfortable, and I really appreciated that each seat had an electric outlet to charge devices. The staff was great.
Malaysia Airlines
7.3
Good
278 reviews
Thai Airways
7.8
Good
360 reviews
Check prices

Comfort

7.6

Overall

7.8

Crew

8.3

Food

7.3

Boarding

7.9

Entertainment

6.9

Reviews

1 / 18
10.0
Excellent

Joe,Jun 2025

BKK - TPE

The flight was very comfortable, and I really appreciated that each seat had an electric outlet to charge devices. The staff was great.
Air China
7.2
Good
115 reviews
Thai Airways
7.8
Good
360 reviews
Check prices

Comfort

7.6

Overall

7.8

Crew

8.3

Food

7.3

Boarding

7.9

Entertainment

6.9

Reviews

1 / 18
10.0
Excellent

Joe,Jun 2025

BKK - TPE

The flight was very comfortable, and I really appreciated that each seat had an electric outlet to charge devices. The staff was great.

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 £384, Shenzhen Airlines will fly you from London Heathrow Airport to Phnom Penh and back. In addition to Shenzhen Airlines, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Air China and China Southern - these airlines can fly you to your destination from £404 and £418, respectively. You may be able to fly from London Heathrow Airport to Phnom Penh for 45% less than the average price by searching for these airlines.

  • 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 £395). Flying from London Heathrow Airport to Phnom Penh in July is currently the most expensive (average of £687). 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 22 October 2025.
AirlineCheapestAverageFlexibilityOn-time
Shenzhen AirlinesCheapest£384Average£456FlexibilityNo cancel feeOn-time63%
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Air ChinaCheapest£404Average£502FlexibilityNo cancel feeOn-time67%
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China SouthernCheapest£418Average£558FlexibilityNo cancel feeOn-time69%
Search China Southern flights
Etihad AirwaysCheapest£515Average£600FlexibilityNo cancel feeOn-time75%
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China EasternCheapest£566Average£651FlexibilityNo cancel feeOn-time62%
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Singapore AirlinesCheapest£589Average£704FlexibilityNo cancel feeOn-time81%
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Malaysia AirlinesCheapest£598Average£706FlexibilityNo cancel feeOn-time67%
Search Malaysia Airlines flights
British AirwaysCheapest£650Average£789FlexibilityNo cancel feeOn-time70%
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Vietnam AirlinesCheapest£660Average£717FlexibilityNo cancel feeOn-time81%
Search Vietnam Airlines flights
Cathay PacificCheapest£678Average£801FlexibilityNo cancel feeOn-time72%
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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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