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

Return flights

26 Sep - 07 Oct	Air Serbia
28 Sep - 09 Oct	Air Serbia
28 Sep - 10 Oct	Air Serbia
28 Sep - 11 Oct	Air Serbia
30 Sep - 14 Oct	Air Serbia
29 Sep - 09 Oct	Air Serbia
30 Sep - 10 Oct	Air Serbia
29 Sep - 10 Oct	Air Serbia
30 Sep - 03 Oct	Air Serbia
29 Sep - 04 Oct	Air Serbia
25 Sep - 29 Sep	Air Serbia
26 Sep - 30 Sep	Air Serbia
02 Sep - 12 Sep	Air Serbia
09 Sep - 19 Sep	Air Serbia
05 Sep - 12 Sep	Air Serbia
02 Sep - 05 Sep	Air Serbia
22 Sep - 29 Sep	Air Serbia
16 Sep - 26 Sep	Air Serbia
16 Sep - 19 Sep	Air Serbia
04 Sep - 14 Sep	Air Serbia

Also check the deals for one-way flights from Ljubljana to Athens 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 Athens in September from 144€

Return flights