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

Return flights

14 Dec - 18 Dec	Vueling Airlines
20 Dec - 30 Dec	Vueling Airlines
06 Dec - 08 Dec	Ryanair
07 Dec - 14 Dec	Vueling Airlines
07 Dec - 08 Dec	Vueling Airlines
14 Dec - 01 Jan	Vueling Airlines
07 Dec - 18 Dec	Vueling Airlines
05 Dec - 09 Dec	Lufthansa
05 Dec - 08 Dec	Air Serbia
25 Dec - 01 Jan	Vueling Airlines
26 Dec - 31 Dec	Air Serbia
27 Dec - 01 Jan	Vueling Airlines
26 Dec - 30 Dec	Air Serbia
28 Dec - 01 Jan	Vueling Airlines
29 Dec - 02 Jan	Air Serbia

Also check the deals for one-way flights from Porto 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 Porto to Ljubljana in December from 176€

Return flights