Phnom Penh

$507+ 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 9/24. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — PNH
Aug 2 — Aug 91
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Cheapflights Tip: The best prices from London Heathrow to Phnom Penh Pochentong are usually found in November or March, booked 79 days in advance, depart on a Friday or Thursday and return on a Sunday

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 July 28, 2025.

Round-trip from

$686
(China Southern)

One-way from

$507
(SWISS)

Popular in

July

Cheapest in

November

Average price

$1,321
From London Heathrow to Phnom Penh Pochentong
One-way flight from London Heathrow to Phnom Penh Pochentong
Highest demand for flights based on searches. 15% potential increase in price ($172 potential increase over avg. RT price).
Cheapest flight prices on average. 3% potential price decrease ($34 potential savings vs. average RT price).
Average for round-trip flights in July 2025

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 July 28, 2025.

This China Southern deal was found by Cheapflights users on 7/27. 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 China Southern is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/59:30 pmLHR - PNH
2 stops30h 20mChina Southern
Wed 11/268:00 amPNH - LHR
1 stop17h 15mChina Southern
Deal found 7/27$686
This FlightHub deal was found by Cheapflights users on 7/27. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/55:40 pmLHR - PNH
1 stop22h 30mAir China
Tue 11/2512:25 amPNH - LHR
1 stop24h 25mAir China
Deal found 7/27$702
This Shenzhen Airlines deal was found by Cheapflights users on 7/28. 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 Shenzhen Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/110:05 pmLHR - PNH
1 stop31h 05mShenzhen Airlines
Sat 9/1312:15 pmPNH - LHR
1 stop37h 45mShenzhen Airlines
Deal found 7/28$705
This SWISS deal was found by Cheapflights users on 7/27. 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 SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/276:00 amLHR - PNH
2 stops43h 35mSWISS
Thu 11/137:40 pmPNH - LHR
2 stops29h 10mSWISS
Deal found 7/27$742
This Lufthansa deal was found by Cheapflights users on 7/27. 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 Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/147:25 amLHR - PNH
2 stops43h 15mLufthansa
Mon 3/237:40 pmPNH - LHR
2 stops28h 10mLufthansa
Deal found 7/27$774
This Vietnam Airlines deal was found by Cheapflights users on 7/28. 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 Vietnam Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/77:50 pmLHR - PNH
1 stop18h 10mVietnam Airlines
Wed 9/108:45 pmPNH - LHR
1 stop26h 10mVietnam Airlines
Deal found 7/28$984
This Austrian Airlines deal was found by Cheapflights users on 7/28. 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 Austrian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/17:30 pmLHR - PNH
2 stops17h 05mAustrian Airlines
Mon 9/87:25 pmPNH - LHR
2 stops32h 15mAustrian Airlines
Deal found 7/28$992
This oojo deal was found by Cheapflights users on 7/28. 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.
Sat 10/410:05 pmLHR - PNH
1 stop31h 05mMultiple Airlines
Sat 11/2912:25 amPNH - LHR
1 stop24h 25mMultiple Airlines
Deal found 7/28$1,028
This British Airways deal was found by Cheapflights users on 7/28. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/37:25 pmLHR - PNH
2 stops38h 50mBritish Airways
Sat 9/135:40 pmPNH - LHR
2 stops26h 30mBritish Airways
Deal found 7/28$1,053
This China Airlines deal was found by Cheapflights users on 7/27. 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 China Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/169:10 pmLHR - PNH
1 stop36h 55mChina Airlines
Fri 3/2711:35 amPNH - LHR
1 stop36h 20mChina Airlines
Deal found 7/27$1,063
This Etihad Airways deal was found by Cheapflights users on 7/27. 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 Etihad Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/87:20 pmLHR - PNH
1 stop16h 10mEtihad Airways
Mon 12/297:55 amPNH - LHR
1 stop29h 50mEtihad Airways
Deal found 7/27$1,107

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 July 28, 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

Wed 11/5

9:30 pm-10:50 am

2 stops30h 20m

Phnom Penh Pochentong

Wed 11/26

8:00 am-6:15 pm

1 stop17h 15m

$686

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

Wed 11/5

5:40 pm-11:10 pm

1 stop22h 30m

Phnom Penh Pochentong

Tue 11/25

12:25 am-5:50 pm

1 stop24h 25m

$702

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

Mon 9/1

10:05 pm-11:10 am

1 stop31h 05m

Phnom Penh Pochentong

Sat 9/13

12:15 pm-8:00 pm

1 stop37h 45m

$705

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

Mon 10/27

6:00 am-8:35 am

2 stops43h 35m

Phnom Penh Pochentong

Thu 11/13

7:40 pm-5:50 pm

2 stops29h 10m

$742

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

Sun 9/14

9:00 am-8:40 am

2 stops41h 40m

Phnom Penh Pochentong

Thu 3/26

7:40 pm-2:50 pm

2 stops26h 10m

$774

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

Sat 1/10

8:55 pm-6:30 am

1 stop26h 35m

Phnom Penh Pochentong

Sat 1/31

7:55 pm-6:45 am

1 stop17h 50m

$889

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

Sun 9/7

7:50 pm-8:00 pm

1 stop18h 10m

Phnom Penh Pochentong

Wed 9/10

8:45 pm-4:55 pm

1 stop26h 10m

$984

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

Mon 9/1

7:30 pm-6:35 pm

2 stops17h 05m

Phnom Penh Pochentong

Mon 9/8

7:25 pm-9:40 pm

2 stops32h 15m

$992

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

Sat 10/4

10:05 pm-11:10 am

1 stop31h 05m

Phnom Penh Pochentong

Sat 11/29

12:25 am-5:50 pm

1 stop24h 25m

$1,028

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

Wed 9/3

7:25 pm-4:15 pm

2 stops38h 50m

Phnom Penh Pochentong

Sat 9/13

5:40 pm-2:10 pm

2 stops26h 30m

$1,053

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/27

Showing 1-10 of 22 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 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?

Use this chart to determine the optimal time to book a round-trip flight from Heathrow to Phnom Penh. Price data was last updated on July 25, 2025.

The best time to book flights from London Heathrow Airport to Phnom Penh is 79 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, March is the cheapest month in which you can book a flight from London Heathrow Airport to Phnom Penh (average of $988). Flying from London Heathrow Airport to Phnom Penh in June is currently the most expensive (average of $1,549). 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 July 28, 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 afternoon, which can drop the price by up to 31% versus a flight at noon.

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

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 July 28, 2025.
Read reviews from past customers who have flown China Airlines, Emirates, and Singapore Airlines from London Heathrow Airport to Phnom Penh. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.

Boarding

8.3

Food

7.8

Comfort

8.0

Crew

8.5

Entertainment

8.0

Overall

8.3

Reviews

1 / 20
2.0
Mediocre

Anonymous,Jul 2025

SFO - TPE

Bad News - The flight was delayed and it was due to ground crew issues but the staff were moving things along. The seat size was cramp and i am a lean person. The attendant kept asking me in Chinese when i already stated i don’t speak the language. The food was bad. The taste, aroma, consistent of mush. Even a cafeteria lady can cook better food. Kudos - the pilot made up for lost time to the best of his ability. He made sure that the flight was smooth even though there was occasional turbulence. The landing was great.

Boarding

8.3

Food

7.8

Comfort

8.0

Crew

8.5

Entertainment

8.0

Overall

8.3

Reviews

1 / 20
2.0
Mediocre

Anonymous,Jul 2025

SFO - TPE

Bad News - The flight was delayed and it was due to ground crew issues but the staff were moving things along. The seat size was cramp and i am a lean person. The attendant kept asking me in Chinese when i already stated i don’t speak the language. The food was bad. The taste, aroma, consistent of mush. Even a cafeteria lady can cook better food. Kudos - the pilot made up for lost time to the best of his ability. He made sure that the flight was smooth even though there was occasional turbulence. The landing was great.

Boarding

8.3

Food

7.8

Comfort

8.0

Crew

8.5

Entertainment

8.0

Overall

8.3

Reviews

1 / 20
2.0
Mediocre

Anonymous,Jul 2025

SFO - TPE

Bad News - The flight was delayed and it was due to ground crew issues but the staff were moving things along. The seat size was cramp and i am a lean person. The attendant kept asking me in Chinese when i already stated i don’t speak the language. The food was bad. The taste, aroma, consistent of mush. Even a cafeteria lady can cook better food. Kudos - the pilot made up for lost time to the best of his ability. He made sure that the flight was smooth even though there was occasional turbulence. The landing was great.

Boarding

8.3

Food

7.8

Comfort

8.0

Crew

8.5

Entertainment

8.0

Overall

8.3

Reviews

1 / 20
2.0
Mediocre

Anonymous,Jul 2025

SFO - TPE

Bad News - The flight was delayed and it was due to ground crew issues but the staff were moving things along. The seat size was cramp and i am a lean person. The attendant kept asking me in Chinese when i already stated i don’t speak the language. The food was bad. The taste, aroma, consistent of mush. Even a cafeteria lady can cook better food. Kudos - the pilot made up for lost time to the best of his ability. He made sure that the flight was smooth even though there was occasional turbulence. The landing was great.

Boarding

8.3

Food

7.8

Comfort

8.0

Crew

8.5

Entertainment

8.0

Overall

8.3

Reviews

1 / 20
2.0
Mediocre

Anonymous,Jul 2025

SFO - TPE

Bad News - The flight was delayed and it was due to ground crew issues but the staff were moving things along. The seat size was cramp and i am a lean person. The attendant kept asking me in Chinese when i already stated i don’t speak the language. The food was bad. The taste, aroma, consistent of mush. Even a cafeteria lady can cook better food. Kudos - the pilot made up for lost time to the best of his ability. He made sure that the flight was smooth even though there was occasional turbulence. The landing was great.

Boarding

8.3

Food

7.8

Comfort

8.0

Crew

8.5

Entertainment

8.0

Overall

8.3

Reviews

1 / 20
2.0
Mediocre

Anonymous,Jul 2025

SFO - TPE

Bad News - The flight was delayed and it was due to ground crew issues but the staff were moving things along. The seat size was cramp and i am a lean person. The attendant kept asking me in Chinese when i already stated i don’t speak the language. The food was bad. The taste, aroma, consistent of mush. Even a cafeteria lady can cook better food. Kudos - the pilot made up for lost time to the best of his ability. He made sure that the flight was smooth even though there was occasional turbulence. The landing 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?

    If you book a flight to Phnom Penh from London Heathrow, you will be flying to Pochentong, which is the city’s only airport. Phnom Penh Pochentong (PNH) is located 5.0 mi from the center of Phnom Penh. There are 0 flights from London Heathrow to Pochentong per day from 4 different airlines.

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

    According to our current data, China Southern ($686), Air China ($702), and Shenzhen Airlines ($705) offers the cheapest pricing from London Heathrow Airport to Phnom Penh. Users have found that China Southern is 27% cheaper than the other options available to this destination.

  • What are the cheapest airlines to fly from London Heathrow Airport to Phnom Penh one-way?

    $507 is the cheapest one-way deal found within the past few days, from SWISS. You may also be able to find cheap deals on Etihad Airways and Austrian Airlines, with prices starting from $508 and $527, respectively.

  • 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 vacation 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, March is the cheapest month in which you can book a flight from London Heathrow Airport to Phnom Penh (average of $988). Flying from London Heathrow Airport to Phnom Penh in June is currently the most expensive (average of $1,549). 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

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Complete your trip

Complete your trip to Phnom Penh by adding a car rental and/or hotel reservation to your travel itinerary.

Top 4 airlines flying from Heathrow to Phnom Penh

Discover the top 4 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 2,558,603 searches. Data last updated July 28, 2025.
AirlineCheapestAverageFlexibilityOn-time
China SouthernCheapest$555Average$792FlexibilityNo cancel feeOn-time69%
Air ChinaCheapest$641Average$1,165FlexibilityNo cancel feeOn-time67%
Singapore AirlinesCheapest$776Average$1,053FlexibilityNo cancel feeOn-time81%
Thai AirwaysCheapest$1,031Average$1,167FlexibilityNo cancel feeOn-time77%

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