AirHint found the following cheapest return flights from London (LCY) to Cluj-napoca (CLJ) in September 2025 (see full year).

Return flights

22 Sep - 28 Sep	SWISS
15 Sep - 21 Sep	SWISS
22 Sep - 25 Sep	SWISS
17 Sep - 21 Sep	Lufthansa
11 Sep - 14 Sep	ITA Airways
24 Sep - 28 Sep	Lufthansa
29 Sep - 02 Oct	SWISS
16 Sep - 20 Sep	ITA Airways
16 Sep - 18 Sep	Lufthansa
17 Sep - 18 Sep	Lufthansa
19 Sep - 23 Sep	Lufthansa
15 Sep - 03 Oct	KLM
01 Sep - 01 Oct	ITA Airways

Also check the deals for one-way flights from London to Cluj-napoca 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 Cluj-napoca in September from $346

Return flights