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Cheap flights from Phnom Penh to London from £260

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Phnom Penh to London departing on 18/8. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Find the cheapest flights from Phnom Penh to London

Cheap return flights

China Eastern Logo
00:10 - 18:40PNH-LHR
24h 30m1 stop
China Eastern Logo
21:20 - 23:15LHR-PNH
19h 55m1 stop
£548China Eastern
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Wed, 13 Aug - Thu, 21 Aug
China Southern Logo
08:00 - 19:00PNH-LHR
17h 00m1 stop
China Southern Logo
22:10 - 10:40LHR-PNH
30h 30m1 stop
£558China Southern
Find Deal
Sat, 11 Oct - Thu, 23 Oct
China Southern Logo
08:00 - 19:00PNH-LHR
17h 00m1 stop
China Southern Logo
21:00 - 00:10LHR-PNH
21h 10m2 stops
£561China Southern
Find Deal
Sat, 11 Oct - Thu, 23 Oct
China Southern Logo
15:35 - 18:05PNH-LHR
56h 30m2 stops
China Southern Logo
22:10 - 10:40LHR-PNH
30h 30m1 stop
£570China Southern
Find Deal
Fri, 22 Aug - Tue, 2 Sep
China Southern Logo
15:35 - 19:00PNH-LHR
33h 25m1 stop
China Southern Logo
22:10 - 14:30LHR-PNH
34h 20m1 stop
£572China Southern
Find Deal
Wed, 10 Sep - Thu, 18 Sep
Logo
08:00 - 18:15PNH-LHR
17h 15m1 stop
Logo
21:10 - 10:40LHR-PNH
30h 30m1 stop
£583
Find Deal
Thu, 6 Nov - Fri, 7 Nov
Air China Logo
00:20 - 20:30PNH-LHR
26h 10m1 stop
Air China Logo
20:25 - 11:10LHR-PNH
32h 45m2 stops
£608Air China
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Thu, 21 Aug - Tue, 2 Sep
Air China Logo
00:20 - 20:30PNH-LHR
26h 10m1 stop
Air China Logo
20:25 - 11:10LHR-PNH
32h 45m2 stops
£611Air China
Find Deal
Thu, 21 Aug - Tue, 2 Sep
Logo
11:40 - 15:55PNH-LHR
35h 15m2 stops
Logo
21:10 - 10:40LHR-PNH
30h 30m1 stop
£642
Find Deal
Thu, 6 Nov - Fri, 7 Nov
Qatar Airways Logo
17:10 - 07:20PNH-LHR
21h 10m2 stops
Qatar Airways Logo
08:40 - 15:25LHR-PNH
23h 45m2 stops
£716Qatar Airways
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Fri, 19 Dec - Fri, 2 Jan

Air China flights from Phnom Penh to London Heathrow Airport

Our best Air China deals on Phnom Penh to London Heathrow Airport flight tickets
Air China
21 Aug
PNH00:20Phnom Penh Pochentong
26h 10m
1 stop
LHR20:30London Heathrow
2 Sept
LHR20:25London Heathrow
32h 45m
2 stops
PNH11:10Phnom Penh Pochentong
£608
Find similar
Air China
21 Aug
PNH00:20Phnom Penh Pochentong
26h 10m
1 stop
LHR20:30London Heathrow
2 Sept
LHR20:25London Heathrow
32h 45m
2 stops
PNH11:10Phnom Penh Pochentong
£611
Find similar
Air China
18 Dec
PNH00:25Phnom Penh Pochentong
24h 25m
1 stop
LHR17:50London Heathrow
2 Jan
LHR17:40London Heathrow
22h 30m
1 stop
PNH23:10Phnom Penh Pochentong
£620
Find similar

China Southern flights from Phnom Penh to London Heathrow Airport

Our best China Southern deals on Phnom Penh to London Heathrow Airport flight tickets
China Southern
11 Oct
PNH08:00Phnom Penh Pochentong
17h 00m
1 stop
LHR19:00London Heathrow
23 Oct
LHR22:10London Heathrow
30h 30m
1 stop
PNH10:40Phnom Penh Pochentong
£558
Find similar
China Southern
11 Oct
PNH08:00Phnom Penh Pochentong
17h 00m
1 stop
LHR19:00London Heathrow
23 Oct
LHR21:00London Heathrow
21h 10m
2 stops
PNH00:10Phnom Penh Pochentong
£561
Find similar
China Southern
22 Aug
PNH15:35Phnom Penh Pochentong
56h 30m
2 stops
LHR18:05London Heathrow
2 Sept
LHR22:10London Heathrow
30h 30m
1 stop
PNH10:40Phnom Penh Pochentong
£570
Find similar

momondo Fare Finder

 
Customise your flight search to find flights from Phnom Penh to London Heathrow Airport 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, momondo users made 279,928 searches. Data last updated 1 August 2025.
Use the filters below to find and compare flights from Phnom Penh to London Heathrow Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Phnom PenhLondon

PNH - LHR

PNHLHR

Phnom Penh Pochentong

Wed 13/8

00:10-18:40

1 stop24h 30m

London Heathrow

Thu 21/8

21:20-23:15

1 stop19h 55m

£548

Phnom PenhLondon

PNH - LHR

PNHLHR

Phnom Penh Pochentong

Sat 11/10

08:00-19:00

1 stop17h 00m

London Heathrow

Thu 23/10

22:10-10:40

1 stop30h 30m

£558

Phnom PenhLondon

PNH - LHR

PNHLHR

Phnom Penh Pochentong

Sat 11/10

08:00-19:00

1 stop17h 00m

London Heathrow

Thu 23/10

21:00-00:10

2 stops21h 10m

£561

Phnom PenhLondon

PNH - LHR

PNHLHR

Phnom Penh Pochentong

Fri 22/8

15:35-18:05

2 stops56h 30m

London Heathrow

Tue 2/9

22:10-10:40

1 stop30h 30m

£570

Phnom PenhLondon

PNH - LHR

PNHLHR

Phnom Penh Pochentong

Wed 10/9

15:35-19:00

1 stop33h 25m

London Heathrow

Thu 18/9

22:10-14:30

1 stop34h 20m

£572

Phnom PenhLondon

PNH - LHR

PNHLHR

Phnom Penh Pochentong

Thu 6/11

08:00-18:15

1 stop17h 15m

London Heathrow

Fri 7/11

21:10-10:40

1 stop30h 30m

£583

Phnom PenhLondon

PNH - LHR

PNHLHR

Phnom Penh Pochentong

Thu 21/8

00:20-20:30

1 stop26h 10m

London Heathrow

Tue 2/9

20:25-11:10

2 stops32h 45m

£608

Phnom PenhLondon

PNH - LHR

PNHLHR

Phnom Penh Pochentong

Thu 21/8

00:20-20:30

1 stop26h 10m

London Heathrow

Tue 2/9

20:25-11:10

2 stops32h 45m

£611

Phnom PenhLondon

PNH - LHR

PNHLHR

Phnom Penh Pochentong

Thu 6/11

11:40-15:55

2 stops35h 15m

London Heathrow

Fri 7/11

21:10-10:40

1 stop30h 30m

£642

Phnom PenhLondon

PNH - LHR

PNHLHR

Phnom Penh Pochentong

Fri 19/12

17:10-07:20

2 stops21h 10m

London Heathrow

Fri 2/1

08:40-15:25

2 stops23h 45m

£716

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
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How to get the cheapest flight ticket from Phnom Penh to London Heathrow Airport

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to London Heathrow Airport?

In general, March is the cheapest month to fly from Phnom Penh to London Heathrow Airport. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around £624. The month of October is another great option to travel to London Heathrow Airport, with average flight prices from Phnom Penh averaging around £635.

What is the cheapest day to depart on your flight to London Heathrow Airport?

On average, the least expensive day to fly to London Heathrow Airport from Phnom Penh is on a Thursday. momondo users have found tickets for Thursday departures for as low as £563. However, this price may fluctuate depending on the airline, the season, and holidays. Be sure to avoid booking your departure on a Saturday as prices are generally higher than usual. According to our data, the average ticket price to London Heathrow Airport on Saturday is £829.

What is the cheapest time of day to depart on your flight to London Heathrow Airport?

According to our data, the cheapest time of day to fly to London Heathrow Airport is in the morning. momondo users have found flights departing from Phnom Penh to London Heathrow Airport in the morning for as low as £534. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. If you have a flexible travel schedule, then try to avoid flying in the afternoon when prices are £1,042 on average. Flights to London Heathrow Airport from Phnom Penh in the afternoon are generally more expensive because this time of day is more convenient for travellers’ schedules.

How far in advance should I book a flight to London Heathrow Airport?

You are more likely to see cheaper flights to London Heathrow Airport from Phnom Penh when booking weeks ahead of your departure date. In general, you can expect to find flights to London Heathrow Airport for around £794 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to London Heathrow Airport from Phnom Penh for as low as £615 on momondo.

How have Phnom Penh to London Heathrow Airport flight prices changed over time?

As of August 2025, prices for Phnom Penh to London Heathrow Airport flights are approximately 30% cheaper when compared to flights at the same time last year.

When to book flights from Phnom Penh to London Heathrow Airport

Are you open to changing your travel dates? Check out the ideal times to fly from Phnom Penh to London Heathrow Airport according to our flight data. Find out which month and days have the cheapest flights.
Estimated return price

Cheap Phnom Penh to London Heathrow Airport (PNH to LHR) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Phnom Penh to London Heathrow Airport

Best price found

£260

Fastest flight time

15h 55m

Direct flights

None
The best one-way flight to London Heathrow Airport from Phnom Penh in the past 72 hours is £260. The best return flight deal from Phnom Penh to London Heathrow Airport found on momondo in the last 72 hours is £548.
The fastest flight from Phnom Penh to London Heathrow Airport takes 15h 55m
There are no direct flights from Phnom Penh to London Heathrow Airport. Popular non-direct route for this connection is Phnom Penh Pochentong Airport - London Heathrow Airport.
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  • How far is Phnom Penh Pochentong to London Heathrow by plane?

    Phnom Penh Pochentong and London Heathrow are 6233.8 mi apart from one another. Flights usually cover this in 17h 00m, depending on flying conditions and air traffic around both airports.

  • When did momondo last update prices for flights from Phnom Penh Pochentong Airport to London Heathrow Airport?

    Prices for flights from Phnom Penh Pochentong Airport to London Heathrow Airport were last updated today.

  • How old do you have to be to fly from Phnom Penh Pochentong Airport to London Heathrow Airport?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Phnom Penh Pochentong Airport to London Heathrow Airport.

  • What documentation or ID do you need to fly to London Heathrow Airport?

    The travel and health documents you'll need for your trip to London Heathrow Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at London Heathrow Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

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Why use momondo?

Why should I use momondo to find a flight deal from Phnom Penh to London?

It is quick and easy to find Phnom Penh to London flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to London that suits you.

Can I find flights from Phnom Penh to London with flexible booking policies on momondo?

momondo does allow users to show only those flights to London from Phnom Penh which offer a flexible booking policy as well as other useful filters and features.

How can momondo help me find flights from Phnom Penh to London?

momondo provides multiple filters to help you find the best flight to London from Phnom Penh. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

I’m not ready to book a flight from Phnom Penh to London right now. Can momondo alert me if prices change?

Price alerts on flights to London from Phnom Penh are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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