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

Return flights

16 Sep - 28 Sep	Wizz Air Malta
23 Sep - 29 Sep	Wizz Air Malta
11 Sep - 16 Sep	Brussels Airlines
12 Sep - 20 Sep	SWISS
16 Sep - 23 Sep	SWISS
25 Sep - 07 Oct	SWISS
26 Sep - 07 Oct	SWISS
27 Sep - 07 Oct	SWISS
11 Sep - 15 Sep	Wizz Air Malta
08 Sep - 21 Sep	Volotea
07 Sep - 14 Sep	Vueling Airlines
23 Sep - 27 Sep	Wizz Air Malta
17 Sep - 21 Sep	Wizz Air Malta
26 Sep - 06 Oct	Wizz Air Malta
23 Sep - 02 Oct	Wizz Air Malta
30 Sep - 10 Oct	Wizz Air Malta
28 Sep - 04 Oct	Wizz Air Malta
28 Sep - 05 Oct	Wizz Air Malta
23 Sep - 03 Oct	Wizz Air Malta
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 162€

Return flights