$1,641+ Cheap flights from Heathrow (LHR) to Phnom Penh (PNH)
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 7/22. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — PNH
Jun 8 — Jun 151
Round-trip
1 adult, Economy
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One-way
One-way flights from Heathrow to Phnom PenhSearch for one-way flight options from Heathrow to Phnom Penh. Find affordable one-way fares based on user searches. Data last updated May 9, 2026.
Search for one-way flight options from Heathrow to Phnom Penh. Find affordable one-way fares based on user searches. Data last updated May 9, 2026.
This oojo deal was found by Cheapflights users on 5/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/227:25 pm
LHR
- PNH
2 stops32h 35m
British Airways
Deal found 5/6![British Airways logo]()
$1,641
Find 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 May 9, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Popular in | July |
Cheapest in | October |
Average price | $792 |
Cheapflights Fare Finder
Customize 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 2,558,603 searches. Data last updated May 9, 2026.
Use the filters below to find and compare flights from London Heathrow Airport to Phnom Penh that are best for you.
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LondonPhnom Penh
LHR - PNH
LHRPNH
London Heathrow
Wed 7/22
7:25 pm-10:00 am
2 stops32h 35m
$1,641
Sorted by cheapest first
- Most accurate provider: When it comes to deals on London Heathrow Airport-Phnom Penh flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on London Heathrow Airport-Phnom Penh flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from London Heathrow Airport-Phnom Penh flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on London Heathrow Airport-Phnom Penh flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for London Heathrow Airport-Phnom Penh flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
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.
LHR-PNH
Estimated round-trip 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?
The best time to book flights from London Heathrow Airport to Phnom Penh is 13 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, November is the cheapest month in which you can book a flight from London Heathrow Airport to Phnom Penh (average of $771). Flying from London Heathrow Airport to Phnom Penh in July is currently the most expensive (average of $1,339). 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.
Related info for your journey
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