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

Return flights

01 Sep - 01 Oct	Wizz Air UK
25 Sep - 06 Oct	Wizz Air UK
20 Sep - 30 Sep	Wizz Air UK
10 Sep - 17 Sep	Wizz Air
02 Sep - 24 Sep	Wizz Air
06 Sep - 26 Sep	Wizz Air
03 Sep - 01 Oct	easyJet
29 Sep - 06 Oct	easyJet
25 Sep - 09 Oct	Wizz Air
11 Sep - 25 Sep	Wizz Air
25 Sep - 16 Oct	Wizz Air
01 Sep - 16 Sep	easyJet
12 Sep - 24 Sep	easyJet
22 Sep - 08 Oct	easyJet
09 Sep - 09 Oct	Wizz Air
15 Sep - 08 Oct	easyJet
03 Sep - 19 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 640€

Return flights