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

Return flights

01 Sep - 10 Sep	easyJet
01 Sep - 14 Sep	easyJet
27 Sep - 11 Oct	easyJet
06 Sep - 16 Sep	easyJet
14 Sep - 04 Oct	easyJet
25 Sep - 16 Oct	easyJet
22 Sep - 28 Sep	easyJet
21 Sep - 28 Sep	easyJet
12 Sep - 20 Sep	easyJet
06 Sep - 13 Sep	easyJet
13 Sep - 20 Sep	easyJet
15 Sep - 29 Sep	easyJet
20 Sep - 27 Sep	easyJet

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 $951

Return flights