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

Return flights

10 Sep - 18 Sep	Emirates
17 Sep - 24 Sep	Emirates
15 Sep - 30 Sep	Emirates
25 Sep - 09 Oct	Emirates
01 Sep - 01 Oct	Emirates
19 Sep - 20 Oct	Emirates
01 Sep - 15 Sep	Emirates
29 Sep - 10 Oct	Emirates
29 Sep - 05 Oct	Emirates
21 Sep - 04 Oct	Emirates
21 Sep - 26 Sep	Emirates
26 Sep - 05 Oct	Emirates
13 Sep - 27 Sep	Emirates
27 Sep - 04 Oct	Emirates
06 Sep - 13 Sep	Emirates
11 Sep - 14 Sep	Emirates
10 Sep - 14 Sep	Emirates

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

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 September from $1008

Return flights