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

Return flights

27 Dec - 31 Dec	Air Serbia
31 Dec - 05 Jan	Air Serbia
29 Dec - 05 Jan	Air Serbia
26 Dec - 31 Dec	Aegean Airlines
28 Dec - 02 Jan	Air Serbia
29 Dec - 02 Jan	Air Serbia
29 Dec - 01 Jan	Air Serbia
26 Dec - 02 Jan	Air Serbia
28 Dec - 01 Jan	Air Serbia
28 Dec - 05 Jan	Air Serbia
31 Dec - 04 Jan	Air Serbia
25 Dec - 04 Jan	Air Serbia
27 Dec - 30 Dec	Air Serbia
24 Dec - 30 Dec	Air France
23 Dec - 29 Dec	Air Serbia
25 Dec - 30 Dec	KLM
26 Dec - 29 Dec	Aegean Airlines
26 Dec - 30 Dec	Turkish Airlines
23 Dec - 26 Dec	Air Serbia
23 Dec - 24 Dec	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 224€

Return flights