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Cheap flights from London to Phnom Penh from C$ 1,486

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from London to Phnom Penh departing on 15/8. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

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LON
-
PNH
16104 kmmulti-stop
Multiple Airlines Logo
PNH
-
LON
16104 kmmulti-stop
Multiple Airlines

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Customize your flight search to find flights from London 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, momondo users made 96,600 searches. Data last updated 16 June 2026.
Use the filters below to find and compare flights from London to Phnom Penh that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest one-way
Quickest one-way

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

Sat 15/8

9:30 p.m.-10:00 a.m.

1 stop30h 30m

C$ 1,486

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

Thu 15/10

9:30 p.m.-10:00 a.m.

1 stop30h 30m

C$ 1,672

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

Tue 14/7

9:30 p.m.-10:00 a.m.

1 stop30h 30m

C$ 1,743

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

Tue 14/7

9:30 p.m.-10:00 a.m.

1 stop30h 30m

C$ 1,925

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

Tue 14/7

9:30 p.m.-10:00 a.m.

1 stop30h 30m

C$ 2,109

LondonPhnom Penh

LHR - PNH

LHRPNH

London Heathrow

Tue 21/7

9:30 p.m.-10:00 a.m.

1 stop30h 30m

C$ 2,301

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

See travel insights to Phnom Penh from

How to get the cheapest flight ticket from London to Phnom Penh

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 Phnom Penh?

The cheapest month to fly to Phnom Penh from London is in September. Flight prices, which tend to average around C$ 579, are often lower during this time because this is during the off-season. If you aren’t able to travel to Phnom Penh during the month of September, then flying in November is also cheap. Prices for this month can be found on momondo for an average of C$ 678.

How far in advance should I book a flight from London to Phnom Penh?

You are more likely to see cheaper flights to Phnom Penh from London when booking weeks ahead of your departure date. In general, you can expect to find flights to Phnom Penh for around C$ 1,313 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Phnom Penh from London for as low as C$ 1,092 on momondo.

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

As of June 2026, prices for London to Phnom Penh flights are approximately 17% more expensive when compared to flights at the same time last year.

When to book flights from London to Phnom Penh

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

Cheap London to Phnom Penh (LON to PNH) flight deals and tips

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

Fastest flight time

20h 40m

Direct flights

None
The fastest flight from London to Phnom Penh takes 20h 40m
There are no direct flights from London to Phnom Penh. There are no popular flight routes from London to Phnom Penh.
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Frequently asked questions about flying from London to Phnom Penh

  • How far is London to Phnom Penh Pochentong by plane?

    The distance between London and Phnom Penh Pochentong is about 10009.6 km. 20h 40m is a normal flight duration for this route.

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

    Prices for flights from London to Phnom Penh Pochentong Airport are updated daily.

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

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from London to Phnom Penh Pochentong Airport.

  • What documentation or ID do you need to fly to Phnom Penh Pochentong Airport?

    The required travel and health documents for your Phnom Penh Pochentong Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Phnom Penh Pochentong Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

Why use momondo?

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

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from London to Phnom Penh for you.

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

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

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

Once all potential London to Phnom Penh flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

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

Price alerts on flights to Phnom Penh from London 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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