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

Return flights

12 Dec - 15 Dec	Air Serbia
03 Dec - 08 Dec	Air Serbia
03 Dec - 08 Dec	Turkish Airlines	direct
12 Dec - 15 Dec	Turkish Airlines	direct
20 Dec - 29 Dec	LOT
20 Dec - 29 Dec	Turkish Airlines	direct
25 Dec - 10 Jan	Air Serbia
27 Dec - 03 Jan	Air Serbia
25 Dec - 10 Jan	Turkish Airlines	direct
27 Dec - 03 Jan	Turkish Airlines	direct

Also check the deals for one-way flights from Ljubljana to Istanbul 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 Istanbul in December from $242

Return flights