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

Return flights

24 Aug - 23 Sep	Pegasus Airlines
25 Aug - 24 Sep	Pegasus Airlines
25 Aug - 01 Sep	Pegasus Airlines
29 Aug - 08 Sep	Ryanair
30 Aug - 15 Sep	Pegasus Airlines
25 Aug - 09 Sep	AJet
19 Aug - 08 Sep	Ryanair
23 Aug - 02 Sep	AJet
24 Aug - 08 Sep	Pegasus Airlines
20 Aug - 10 Sep	Ryanair
23 Aug - 30 Aug	AJet
16 Aug - 30 Aug	Pegasus Airlines
18 Aug - 31 Aug	Ryanair
17 Aug - 31 Aug	Ryanair
19 Aug - 31 Aug	Ryanair
19 Aug - 26 Aug	Emirates
21 Aug - 28 Aug	Ryanair
18 Aug - 22 Aug	Ryanair
15 Aug - 31 Aug	Ryanair
18 Aug - 25 Aug	Ryanair

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 692€

Return flights