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

Return flights

05 Dec - 12 Dec	Aegean Airlines	direct
05 Dec - 09 Dec	Aegean Airlines
03 Dec - 07 Dec	Air Serbia
13 Dec - 16 Dec	Air Serbia
11 Dec - 14 Dec	Air Serbia
09 Dec - 16 Dec	Air Serbia
18 Dec - 23 Dec	Air Serbia
02 Dec - 05 Dec	Air Serbia
11 Dec - 12 Dec	Air Serbia
09 Dec - 12 Dec	Air Serbia
26 Dec - 01 Jan	Air Serbia
29 Dec - 03 Jan	Aegean Airlines
29 Dec - 04 Jan	Aegean Airlines
29 Dec - 05 Jan	Air Serbia
31 Dec - 04 Jan	Air Serbia
27 Dec - 04 Jan	Air Serbia
28 Dec - 02 Jan	Air Serbia
28 Dec - 04 Jan	Air Serbia
27 Dec - 03 Jan	Air Serbia
28 Dec - 05 Jan	Air Serbia

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 137€

Return flights