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

Return flights

29 Sep - 01 Oct	Air Serbia
29 Sep - 30 Sep	Air Serbia
29 Sep - 06 Oct	Air Serbia
25 Sep - 30 Sep	LOT
26 Sep - 29 Sep	Air Serbia
23 Sep - 30 Sep	LOT
23 Sep - 27 Sep	LOT
30 Sep - 04 Oct	LOT
22 Sep - 24 Sep	Turkish Airlines
22 Sep - 25 Sep	Turkish Airlines
22 Sep - 26 Sep	Turkish Airlines
28 Sep - 01 Oct	Turkish Airlines
25 Sep - 28 Sep	LOT
29 Sep - 29 Sep	LOT
30 Sep - 04 Oct	Brussels Airlines	direct
30 Sep - 01 Oct	Brussels Airlines	direct
28 Sep - 01 Oct	Brussels Airlines	direct
29 Sep - 06 Oct	Brussels Airlines	direct
29 Sep - 01 Oct	Brussels Airlines	direct
30 Sep - 02 Oct	Brussels Airlines	direct

Also check the deals for one-way flights from Ljubljana to Brussels 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 Ljubljana to Brussels in September from $286

Return flights