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

Return flights

01 Dec - 05 Dec	Brussels Airlines	direct
02 Dec - 05 Dec	Brussels Airlines	direct
22 Dec - 02 Jan	LOT
17 Dec - 29 Dec	Brussels Airlines
22 Dec - 30 Dec	LOT
22 Dec - 06 Jan	LOT
18 Dec - 26 Dec	Lufthansa
17 Dec - 29 Dec	Brussels Airlines	direct
22 Dec - 26 Dec	LOT
31 Dec - 04 Jan	LOT
09 Dec - 11 Dec	Vueling Airlines
30 Dec - 15 Jan	Vueling Airlines
26 Dec - 04 Jan	LOT
09 Dec - 14 Dec	Vueling Airlines
22 Dec - 29 Dec	LOT
26 Dec - 04 Jan	Brussels Airlines	direct
24 Dec - 02 Jan	LOT
19 Dec - 04 Jan	Brussels Airlines	direct
20 Dec - 04 Jan	LOT
21 Dec - 05 Jan	Brussels Airlines	direct

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 122€

Return flights