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

Return flights

11 Dec - 15 Dec	Vueling Airlines
11 Dec - 14 Dec	Vueling Airlines
09 Dec - 16 Dec	Vueling Airlines
01 Dec - 13 Dec	easyJet
10 Dec - 15 Dec	easyJet
10 Dec - 16 Dec	Air Serbia
12 Dec - 14 Dec	Wizz Air
06 Dec - 09 Dec	easyJet
04 Dec - 07 Dec	Air Serbia
25 Dec - 01 Jan	Air Serbia
06 Dec - 18 Dec	Air Serbia
25 Dec - 03 Jan	Air Serbia
23 Dec - 02 Jan	easyJet
30 Dec - 02 Jan	Vueling Airlines
28 Dec - 02 Jan	Air Serbia
29 Dec - 05 Jan	KLM
27 Dec - 03 Jan	Air Serbia
26 Dec - 03 Jan	KLM

Also check the deals for one-way flights from Ljubljana to Lisbon 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 Ljubljana to Lisbon in December from $147

Return flights