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

Return flights

27 Sep - 30 Sep	Eurowings	direct
27 Sep - 02 Oct	Eurowings	direct
20 Sep - 02 Oct	Eurowings	direct
20 Sep - 27 Sep	Eurowings	direct
20 Sep - 23 Sep	Eurowings	direct
20 Sep - 25 Sep	Eurowings	direct
25 Sep - 27 Sep	Eurowings	direct
20 Sep - 30 Sep	Eurowings	direct
30 Sep - 02 Oct	Eurowings	direct
27 Sep - 04 Oct	Eurowings	direct
23 Sep - 30 Sep	Air Serbia
18 Sep - 20 Sep	Eurowings	direct
18 Sep - 27 Sep	Eurowings	direct
30 Sep - 04 Oct	Eurowings	direct
21 Sep - 27 Sep	Air Serbia
25 Sep - 05 Oct	Eurowings
29 Sep - 06 Oct	Air Serbia
21 Sep - 03 Oct	Air Serbia
26 Sep - 06 Oct	Lufthansa

Also check the deals for one-way flights from Duesseldorf 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 Duesseldorf to Ljubljana in September from 109€

Return flights