AirHint found the following cheapest return flights from London (LCY) to Ljubljana (LJU) in September 2026 (see full year).

Return flights

01 Sep - 15 Sep	SWISS
15 Sep - 22 Sep	SWISS
08 Sep - 16 Sep	SWISS
08 Sep - 15 Sep	SWISS
22 Sep - 30 Sep	SWISS
01 Sep - 09 Sep	SWISS
23 Sep - 29 Sep	SWISS
01 Sep - 10 Sep	SWISS
02 Sep - 08 Sep	SWISS
11 Sep - 15 Sep	SWISS
24 Sep - 06 Oct	SWISS
29 Sep - 04 Oct	SWISS
25 Sep - 01 Oct	SWISS
26 Sep - 01 Oct	SWISS
28 Sep - 05 Oct	SWISS
28 Sep - 02 Oct	SWISS
26 Sep - 02 Oct	SWISS
29 Sep - 02 Oct	KLM
27 Sep - 02 Oct	SWISS
30 Sep - 02 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 214€

Return flights