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

Return flights

27 Sep - 05 Oct	Wizz Air UK
02 Sep - 16 Sep	Wizz Air
21 Sep - 05 Oct	Wizz Air
11 Sep - 18 Sep	Wizz Air
06 Sep - 26 Sep	Wizz Air
29 Sep - 05 Oct	Ryanair
06 Sep - 14 Sep	Wizz Air
07 Sep - 14 Sep	Wizz Air
08 Sep - 22 Sep	easyJet
29 Sep - 17 Oct	Ryanair
10 Sep - 22 Sep	easyJet
13 Sep - 20 Sep	easyJet
06 Sep - 13 Sep	Wizz Air
28 Sep - 17 Oct	easyJet
26 Sep - 10 Oct	easyJet
26 Sep - 09 Oct	easyJet
21 Sep - 26 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 688€

Return flights