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

Return flights

17 Sep - 24 Sep	LOT
23 Sep - 30 Sep	LOT
01 Sep - 06 Sep	KLM
06 Sep - 13 Sep	LOT
11 Sep - 18 Sep	LOT
15 Sep - 22 Sep	LOT
16 Sep - 25 Sep	LOT
30 Sep - 09 Oct	Lufthansa
06 Sep - 11 Sep	LOT
07 Sep - 13 Sep	LOT
23 Sep - 28 Sep	LOT
29 Sep - 06 Oct	SWISS
30 Sep - 03 Oct	LOT
27 Sep - 06 Oct	Lufthansa
29 Sep - 03 Oct	SWISS

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 177€

Return flights