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

Return flights

05 Dec - 07 Dec	Air Serbia
16 Dec - 25 Dec	KLM
31 Dec - 02 Jan	Air Serbia
27 Dec - 02 Jan	LOT
19 Dec - 21 Dec	Air Serbia
24 Dec - 28 Dec	Air Serbia
22 Dec - 29 Dec	Air Serbia
23 Dec - 04 Jan	LOT
01 Dec - 04 Dec	Air France
24 Dec - 04 Jan	Lufthansa	direct
13 Dec - 14 Dec	LOT
23 Dec - 28 Dec	Air Serbia
23 Dec - 04 Jan	Lufthansa	direct
25 Dec - 04 Jan	Lufthansa	direct
22 Dec - 29 Dec	Lufthansa	direct
05 Dec - 07 Dec	Lufthansa	direct
30 Dec - 01 Jan	KLM

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 $243

Return flights