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

Return flights

02 Sep - 18 Sep	China Southern
29 Sep - 06 Oct	Cambodia Airways
12 Sep - 23 Sep	China Southern
03 Sep - 16 Sep	China Southern
30 Sep - 07 Oct	Cambodia Airways
18 Sep - 30 Sep	EVA Air
12 Sep - 14 Sep	EVA Air

Also check the deals for one-way flights from Phnom-penh to London 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 Phnom-penh to London in September from 666€

Return flights