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

Return flights

31 Aug - 11 Sep	Shenzhen Airlines
29 Aug - 13 Sep	China Southern
30 Aug - 05 Sep	China Southern
26 Aug - 04 Sep	China Southern
31 Aug - 09 Sep	Shenzhen Airlines
28 Aug - 04 Sep	China Southern
26 Aug - 16 Sep	Etihad Airways
30 Aug - 20 Sep	China Southern
20 Aug - 10 Sep	SWISS
23 Aug - 06 Sep	Oman Air
11 Aug - 17 Aug	Aegean Airlines
25 Aug - 31 Aug	China Southern
11 Aug - 16 Aug	Aegean Airlines
21 Aug - 31 Aug	Air China
22 Aug - 31 Aug	Air China
20 Aug - 31 Aug	Air China
22 Aug - 29 Aug	Air China
09 Aug - 17 Aug	Air Serbia
17 Aug - 24 Aug	Air India
07 Aug - 14 Aug	Brussels Airlines

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 568€

Return flights