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

Return flights

20 Sep - 27 Sep	Eurowings	direct
30 Sep - 04 Oct	Eurowings	direct
18 Sep - 25 Sep	Eurowings	direct
23 Sep - 25 Sep	Eurowings	direct
23 Sep - 30 Sep	Eurowings	direct
27 Sep - 30 Sep	Eurowings	direct
20 Sep - 23 Sep	Eurowings
18 Sep - 19 Sep	Eurowings
25 Sep - 26 Sep	Eurowings
17 Sep - 20 Sep	Air Serbia
17 Sep - 30 Sep	Air Serbia

Also check the deals for one-way flights from Ljubljana to Duesseldorf 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 Duesseldorf in September from 110€

Return flights