AirHint found the following cheapest return flights from London (LHR) to Phnom-penh (PNH) in August 2025 (see full year).

Return flights

26 Aug - 17 Sep	Vietnam Airlines
23 Aug - 07 Sep	China Southern
14 Aug - 03 Sep	Vietnam Airlines
06 Aug - 13 Aug	Scandinavian Airlines
14 Aug - 04 Sep	Etihad Airways
11 Aug - 18 Aug	Etihad Airways
18 Aug - 25 Aug	Vietnam Airlines
06 Aug - 28 Aug	Scandinavian Airlines
16 Aug - 06 Sep	Shenzhen Airlines
26 Aug - 31 Aug	China Southern
13 Aug - 27 Aug	Vietnam Airlines
01 Aug - 08 Aug	Air China
05 Aug - 21 Aug	Scandinavian Airlines
01 Aug - 22 Aug	Shenzhen Airlines
01 Aug - 15 Aug	Shenzhen Airlines
02 Aug - 20 Sep	Air India

Also check the deals for one-way flights from London to Phnom-penh in August.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from London to Phnom-penh in August from $958

Return flights