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

Return flights

24 Dec - 28 Dec	SWISS
05 Dec - 07 Dec	SWISS
10 Dec - 13 Dec	SWISS
05 Dec - 09 Dec	SWISS
05 Dec - 08 Dec	SWISS
12 Dec - 14 Dec	Ryanair
06 Dec - 09 Dec	SWISS
06 Dec - 08 Dec	SWISS
26 Dec - 29 Dec	SWISS
23 Dec - 28 Dec	Lufthansa
26 Dec - 02 Jan	Lufthansa
30 Dec - 05 Jan	Lufthansa
31 Dec - 03 Jan	SWISS
30 Dec - 01 Jan	Air Serbia
31 Dec - 04 Jan	SWISS
30 Dec - 02 Jan	Ryanair

Also check the deals for one-way flights from Rome 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 Rome to Ljubljana in December from $216

Return flights