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

Return flights

13 Sep - 20 Sep	SWISS
30 Sep - 04 Oct	SWISS
20 Sep - 27 Sep	SWISS
06 Sep - 07 Sep	Air Serbia
27 Sep - 01 Oct	Air Serbia
08 Sep - 16 Sep	Transavia France
14 Sep - 16 Sep	Wizz Air Malta
05 Sep - 08 Sep	SWISS
09 Sep - 12 Sep	Air Serbia
02 Sep - 07 Sep	Transavia France
15 Sep - 18 Sep	Wizz Air Malta

Also check the deals for one-way flights from Rome 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 Rome to Ljubljana in September from 184€

Return flights