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

Return flights

07 Dec - 16 Dec	Ryanair
10 Dec - 16 Dec	Iberia
06 Dec - 09 Dec	Vueling Airlines
18 Dec - 22 Dec	Ryanair
05 Dec - 09 Dec	Ryanair
16 Dec - 19 Dec	Vueling Airlines
18 Dec - 04 Jan	Vueling Airlines
28 Dec - 04 Jan	Ryanair
04 Dec - 11 Dec	Vueling Airlines
01 Dec - 05 Dec	Ryanair
28 Dec - 15 Jan	Vueling Airlines
28 Dec - 08 Jan	Vueling Airlines
28 Dec - 02 Jan	Air Europa
28 Dec - 11 Jan	Vueling Airlines
18 Dec - 25 Dec	Vueling Airlines
19 Dec - 03 Jan	Lufthansa

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 $207

Return flights