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

Return flights

17 Sep - 20 Sep	LOT
10 Sep - 13 Sep	LOT
09 Sep - 13 Sep	LOT
06 Sep - 13 Sep	LOT
06 Sep - 11 Sep	LOT
06 Sep - 08 Sep	LOT
04 Sep - 11 Sep	LOT
06 Sep - 10 Sep	LOT
06 Sep - 09 Sep	LOT
30 Sep - 07 Oct	Lufthansa
30 Sep - 08 Oct	Lufthansa
30 Sep - 09 Oct	Lufthansa
15 Sep - 20 Sep	LOT
24 Sep - 02 Oct	Lufthansa
21 Sep - 04 Oct	SWISS
29 Sep - 02 Oct	SWISS
20 Sep - 04 Oct	LOT
30 Sep - 08 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 $215

Return flights