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

Return flights

15 Dec - 26 Jan	Brussels Airlines	direct
12 Dec - 15 Dec	LOT
05 Dec - 16 Dec	LOT
06 Dec - 08 Dec	LOT
09 Dec - 16 Dec	LOT
09 Dec - 15 Dec	LOT
01 Dec - 12 Dec	LOT
03 Dec - 10 Dec	LOT
03 Dec - 07 Dec	LOT
05 Dec - 12 Dec	LOT
10 Dec - 14 Dec	LOT
18 Dec - 06 Jan	Ryanair
23 Dec - 05 Jan	LOT
27 Dec - 04 Jan	LOT
17 Dec - 04 Jan	LOT
29 Dec - 02 Jan	Brussels Airlines
18 Dec - 05 Jan	Ryanair
22 Dec - 04 Jan	LOT
29 Dec - 04 Jan	LOT
29 Dec - 01 Jan	Brussels Airlines

Also check the deals for one-way flights from Brussels to Ljubljana in December.

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 Brussels to Ljubljana in December from 125€

Return flights