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

Return flights

06 Dec - 13 Dec	Air Serbia
01 Dec - 05 Dec	Air Serbia
12 Dec - 15 Dec	Air Serbia
08 Dec - 12 Dec	Air Serbia
11 Dec - 15 Dec	Air Serbia
09 Dec - 12 Dec	Air Serbia
11 Dec - 14 Dec	Air Serbia
05 Dec - 12 Dec	Air Serbia
29 Dec - 02 Jan	Air Serbia
30 Dec - 03 Jan	Air Serbia
01 Dec - 05 Dec	Aegean Airlines	direct
08 Dec - 12 Dec	Aegean Airlines	direct
29 Dec - 02 Jan	Aegean Airlines	direct

Also check the deals for one-way flights from Athens 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 Athens to Ljubljana in December from 151€

Return flights