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

Return flights

30 Sep - 07 Oct	Air France	direct
30 Sep - 06 Oct	Air Serbia
27 Sep - 02 Oct	Lufthansa
29 Sep - 04 Oct	Air Serbia
23 Sep - 30 Sep	SWISS
25 Sep - 30 Sep	Lufthansa
25 Sep - 29 Sep	Lufthansa
23 Sep - 27 Sep	Air Serbia
24 Sep - 29 Sep	Air Serbia
25 Sep - 02 Oct	Lufthansa
29 Sep - 07 Oct	SWISS
17 Sep - 23 Sep	Air Serbia
18 Sep - 22 Sep	Air Serbia
23 Sep - 26 Sep	Air Serbia
29 Sep - 02 Oct	SWISS
22 Sep - 27 Sep	SWISS
20 Sep - 23 Sep	Lufthansa
26 Sep - 03 Oct	SWISS
26 Sep - 02 Oct	SWISS
25 Sep - 02 Oct	Air France	direct

Also check the deals for one-way flights from Paris to Ljubljana 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 Paris to Ljubljana in September from 162€

Return flights