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

Return flights

06 Dec - 09 Dec	Vueling Airlines
16 Dec - 18 Dec	Vueling Airlines
29 Dec - 04 Jan	Air Serbia
07 Dec - 14 Dec	Vueling Airlines
17 Dec - 31 Dec	Vueling Airlines
07 Dec - 11 Dec	Vueling Airlines
04 Dec - 11 Dec	SWISS
04 Dec - 07 Dec	SWISS
05 Dec - 08 Dec	SWISS
16 Dec - 21 Dec	Vueling Airlines
04 Dec - 14 Dec	Vueling Airlines
16 Dec - 04 Jan	Vueling Airlines
28 Dec - 04 Jan	Vueling Airlines
23 Dec - 04 Jan	Vueling Airlines
18 Dec - 04 Jan	Vueling Airlines

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 160€

Return flights