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

Return flights

13 Dec - 16 Dec	Ryanair
01 Dec - 03 Dec	Air Serbia
13 Dec - 15 Dec	Ryanair
01 Dec - 08 Dec	Air Serbia
08 Dec - 21 Dec	Air Serbia
12 Dec - 14 Dec	Air Serbia
12 Dec - 15 Dec	Air Serbia
10 Dec - 21 Dec	Air Serbia
05 Dec - 07 Dec	Air Serbia
07 Dec - 20 Dec	Lufthansa
18 Dec - 05 Jan	Lufthansa	direct
30 Dec - 05 Jan	Lufthansa	direct
07 Dec - 14 Jan	Wizz Air Malta
30 Dec - 04 Jan	LOT
31 Dec - 04 Jan	LOT
28 Dec - 03 Jan	Lufthansa	direct
20 Dec - 03 Jan	Lufthansa	direct
20 Dec - 02 Jan	LOT
29 Dec - 02 Jan	Air Serbia
23 Dec - 02 Jan	Lufthansa

Also check the deals for one-way flights from Frankfurt 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 Frankfurt to Ljubljana in December from 170€

Return flights