AirHint found the following cheapest return flights from London (LCY) to Ljubljana (LJU) in September 2025 (see full year).

Return flights

30 Sep - 06 Oct	SWISS
26 Sep - 02 Oct	SWISS
26 Sep - 01 Oct	SWISS
23 Sep - 30 Sep	SWISS
26 Sep - 29 Sep	SWISS
17 Sep - 24 Sep	SWISS
16 Sep - 23 Sep	SWISS
23 Sep - 29 Sep	SWISS
24 Sep - 30 Sep	SWISS
19 Sep - 25 Sep	SWISS
20 Sep - 29 Sep	SWISS
24 Sep - 01 Oct	SWISS
27 Sep - 08 Oct	SWISS
27 Sep - 02 Oct	SWISS
27 Sep - 01 Oct	SWISS
27 Sep - 29 Sep	SWISS
22 Sep - 30 Sep	Lufthansa
27 Sep - 11 Oct	SWISS
29 Sep - 02 Oct	Lufthansa
29 Sep - 03 Oct	KLM

Also check the deals for one-way flights from London to Ljubljana 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 Ljubljana in September from 224€

Return flights