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

Return flights

19 Sep - 23 Sep	Air Serbia
27 Sep - 01 Oct	Brussels Airlines
26 Sep - 02 Oct	Air Serbia
19 Sep - 28 Sep	Air Serbia
23 Sep - 30 Sep	Wizz Air Malta
25 Sep - 30 Sep	Wizz Air Malta
19 Sep - 25 Sep	Air Serbia
19 Sep - 24 Sep	Air Serbia
24 Sep - 26 Sep	Air Serbia
19 Sep - 21 Sep	Air Serbia
23 Sep - 28 Sep	Wizz Air Malta
25 Sep - 28 Sep	Wizz Air Malta
29 Sep - 02 Oct	Wizz Air
29 Sep - 03 Oct	Air Europa
29 Sep - 07 Oct	Air Europa
30 Sep - 05 Oct	Transavia France
22 Sep - 03 Oct	Brussels Airlines

Also check the deals for one-way flights from Madrid 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 Madrid to Ljubljana in September from $211

Return flights