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

Return flights

03 Dec - 10 Dec	Wizz Air Malta
07 Dec - 10 Dec	Wizz Air Malta
04 Dec - 06 Dec	Air Serbia
18 Dec - 21 Dec	Wizz Air Malta
24 Dec - 31 Dec	SWISS
07 Dec - 13 Dec	SWISS
10 Dec - 12 Dec	Air France
02 Dec - 06 Dec	Air Serbia
11 Dec - 14 Dec	Air Serbia
13 Dec - 16 Dec	Air Serbia
31 Dec - 06 Jan	Air Serbia
27 Dec - 01 Jan	SWISS
29 Dec - 02 Jan	Lufthansa
30 Dec - 01 Jan	Ryanair
31 Dec - 03 Jan	SWISS
30 Dec - 05 Jan	SWISS
30 Dec - 02 Jan	Ryanair
31 Dec - 01 Jan	Ryanair
31 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 138€

Return flights