AirHint found the following cheapest return flights from Ljubljana (LJU) to Thessaloniki (SKG) in September 2025 (see full year).

Return flights

22 Sep - 26 Sep	Air Serbia
21 Sep - 25 Sep	Air Serbia
22 Sep - 27 Sep	Air Serbia
15 Sep - 22 Sep	Air Serbia
14 Sep - 18 Sep	Air Serbia
15 Sep - 20 Sep	Air Serbia
17 Sep - 21 Sep	Turkish Airlines
16 Sep - 21 Sep	Air Serbia

Also check the deals for one-way flights from Ljubljana to Thessaloniki in September.

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 Thessaloniki in September from $192

Return flights