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$1,038+ Cheap flights from Phnom Penh (PNH) to Heathrow (LHR)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 3/12. Fares are subject to change and may not be available on all flights or dates of travel.
PNH — LHR
Oct 15 — Oct 221
Wed 10/15
Wed 10/22
1 adult, Economy
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Cheapflights Tip: The best prices from Phnom Penh Pochentong to London Heathrow are usually found in August or March, booked 42 days in advance, depart on a Sunday or Saturday and return on a Friday

Cheap flight deals from Phnom Penh to Heathrow

Discover tips and strategies to find the most affordable flight options for your journey from Phnom Penh (PNH) to Heathrow (LHR). 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 September 15, 2025.

Round-trip from

$1,038
(Etihad Airways)

Popular in

February

Cheapest in

August

Average price

$1,168
From Phnom Penh Pochentong to London Heathrow
Search Deals
Highest demand for flights based on searches. 0% potential increase in price ($6 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($22 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in September 2025
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Find flight deals from Phnom Penh to Heathrow

Cheapest flights from Phnom Penh to Heathrow
Explore the most affordable flight options available from Phnom Penh to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 15, 2025.

This Mytrip deal was found by Cheapflights users on 9/15. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/307:55 amPNH - LHR
3 stops31h 10mMultiple Airlines
Thu 11/66:35 amLHR - PNH
2 stops16h 55mMultiple Airlines
Deal found 9/15$1,376

Cheapflights Fare Finder

 
Customize your flight search to find flights from Phnom Penh to Heathrow 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 September 15, 2025.
Use the filters below to find and compare flights from Phnom Penh to London Heathrow Airport that are best for you.

Fly from

Phnom Penh

Fly to

Heathrow

Route

Depart

Return

Price

Phnom PenhLondon

PNH - LHR

PNHLHR

Phnom Penh Pochentong

Thu 3/12

7:50 pm-2:30 pm

1 stop25h 40m

London Heathrow

Mon 3/16

8:55 pm-6:25 pm

1 stop14h 30m

$1,038

Phnom PenhLondon

PNH - LHR

PNHLHR

Phnom Penh Pochentong

Thu 10/30

7:55 am-8:05 am

3 stops31h 10m

London Heathrow

Thu 11/6

6:35 am-6:30 am

2 stops16h 55m

$1,376

Phnom PenhLondon

PNH - LHR

PNHLHR

Phnom Penh Pochentong

Mon 3/9

7:55 am-2:30 pm

1 stop37h 35m

$1,727

Phnom PenhLondon

PNH - LHR

PNHLHR

Phnom Penh Pochentong

Mon 3/9

7:55 am-8:25 am

2 stops31h 30m

$2,244

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/14

Best time to book a flight from Phnom Penh to Heathrow

Have a flexible travel schedule? Discover the best time to fly to Heathrow from Phnom Penh with our price prediction graph.
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 Phnom Penh to London Heathrow Airport

How far ahead should I book a flight from Phnom Penh to London Heathrow Airport?

Use this chart to determine the optimal time to book a round-trip flight from Phnom Penh to Heathrow. Price data was last updated on September 12, 2025.

To ensure you get the cheapest price possible for a flight from Phnom Penh to London Heathrow Airport, you should look to book at least 42 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

What is the cheapest month to book a flight from Phnom Penh to London Heathrow Airport?

Currently, November is the cheapest month in which you can book a flight from Phnom Penh to London Heathrow Airport (average of $661). Flying from Phnom Penh to London Heathrow Airport in June is currently the most expensive (average of $1,097). 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 PNH to LHR?

Find hourly flight availability from Phnom Penh to Heathrow. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 15, 2025.

It’s typically best to fly out from Phnom Penh to London Heathrow Airport in the morning. Doing so could potentially save you 27% on the flight price compared to flying at noon, which is usually more expensive.

How much does it cost to fly round-trip from Phnom Penh to London Heathrow Airport?

Reviews of airlines servicing Heathrow

Get insights into the airlines that provide service to Heathrow. 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 Heathrow. Reviews last updated September 15, 2025.
Read through reviews of airlines operating flights from Phnom Penh to London Heathrow Airport, such as Singapore Airlines, Thai Airways, and China Southern. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Singapore Airlines
8.1
Very good
1,365 reviews

Crew

8.6

Food

7.7

Comfort

8.0

Entertainment

8.0

Overall

8.1

Boarding

8.2

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
1,365 reviews
Singapore Airlines
8.1
Very good
1,365 reviews

Crew

8.6

Food

7.7

Comfort

8.0

Entertainment

8.0

Overall

8.1

Boarding

8.2

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
7.8
Good
350 reviews
Singapore Airlines
8.1
Very good
1,365 reviews

Crew

8.6

Food

7.7

Comfort

8.0

Entertainment

8.0

Overall

8.1

Boarding

8.2

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
China Southern
7.5
Good
110 reviews
Singapore Airlines
8.1
Very good
1,365 reviews

Crew

8.6

Food

7.7

Comfort

8.0

Entertainment

8.0

Overall

8.1

Boarding

8.2

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
China Eastern
7.2
Good
165 reviews
Singapore Airlines
8.1
Very good
1,365 reviews

Crew

8.6

Food

7.7

Comfort

8.0

Entertainment

8.0

Overall

8.1

Boarding

8.2

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
Air China
7.2
Good
99 reviews
Singapore Airlines
8.1
Very good
1,365 reviews

Crew

8.6

Food

7.7

Comfort

8.0

Entertainment

8.0

Overall

8.1

Boarding

8.2

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 Phnom Penh to Heathrow. 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 from for flights from Phnom Penh to London Heathrow?

    Most people fly from Phnom Penh Pochentong (PNH) if they book a flight from Phnom Penh to London Heathrow. On average, Pochentong has 0 outbound flights to London Heathrow per day from 6 airlines. Phnom Penh Pochentong is conveniently located just 5.0 mi from Phnom Penh’s city center.

  • How long is the flight from Phnom Penh to London Heathrow Airport?

    A quick flight from Phnom Penh to London Heathrow Airport can take about 25h 40m. Etihad Airways provides one of the quickest options available for as low as $1,038. Phnom Penh and London Heathrow Airport are separated by a distance of 6232 mi.

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

    Cheapflights users have booked flights from Phnom Penh to London Heathrow Airport round-trip from $564. Other airlines that can offer you cheap pricing are China Southern, from $663, and Air China, from $706. These flights start at 45% lower than the current average price 3 months from now.

  • Can I find deals for flights from Phnom Penh to Heathrow that include hotel bookings?

    Yes. In addition to deals on Phnom Penh to Heathrow flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Phnom Penh to Heathrow?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Phnom Penh to Heathrow.

  • Can I find deals for business class flights from Phnom Penh to Heathrow?

    Yes. Cheapflights offers flight deals from Phnom Penh to Heathrow 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 Phnom Penh to London Heathrow Airport?

    Currently, November is the cheapest month in which you can book a flight from Phnom Penh to London Heathrow Airport (average of $661). Flying from Phnom Penh to London Heathrow Airport in June is currently the most expensive (average of $1,097). 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

Traveling to a place near London Heathrow Airport?

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Top 6 airlines flying from Phnom Penh to Heathrow

Discover the top 6 airlines that operate flights from Phnom Penh to Heathrow. 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 2,558,603 searches. Data last updated September 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
China EasternCheapest$564Average$808FlexibilityNo cancel feeOn-time62%
China SouthernCheapest$663Average$739FlexibilityNo cancel feeOn-time69%
Air ChinaCheapest$706Average$792FlexibilityNo cancel feeOn-time67%
Malaysia AirlinesCheapest$865Average$1,337FlexibilityNo cancel feeOn-time67%
Singapore AirlinesCheapest$921Average$1,273FlexibilityNo cancel feeOn-time81%
Thai AirwaysCheapest$1,120Average$1,314FlexibilityNo cancel feeOn-time77%

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