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

Return flights

27 Sep - 04 Oct	Air Serbia
01 Sep - 16 Sep	SWISS
27 Sep - 29 Sep	Lufthansa
27 Sep - 30 Sep	Brussels Airlines
26 Sep - 30 Sep	Brussels Airlines
25 Sep - 30 Sep	SWISS
30 Sep - 07 Oct	Brussels Airlines
19 Sep - 24 Sep	SWISS
12 Sep - 16 Sep	SWISS
01 Sep - 10 Sep	SWISS
19 Sep - 23 Sep	SWISS
05 Sep - 10 Sep	SWISS
29 Sep - 04 Oct	SWISS
30 Sep - 06 Oct	Brussels Airlines
24 Sep - 01 Oct	SWISS
28 Sep - 03 Oct	Air Serbia
30 Sep - 03 Oct	LOT
26 Sep - 05 Oct	British Airways
28 Sep - 02 Oct	British Airways
11 Sep - 16 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 181€

Return flights