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

Return flights

04 Sep - 09 Sep	KLM
01 Sep - 05 Sep	KLM
29 Sep - 02 Oct	Ryanair
06 Sep - 16 Sep	SWISS
01 Sep - 12 Sep	KLM
15 Sep - 19 Sep	KLM
28 Sep - 04 Oct	Lufthansa
23 Sep - 30 Sep	Aer Lingus
17 Sep - 22 Sep	Lufthansa
01 Sep - 06 Sep	KLM
15 Sep - 06 Oct	SWISS
11 Sep - 14 Sep	KLM
08 Sep - 14 Sep	KLM

Also check the deals for one-way flights from Dublin 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.

Book a cheap hotel in Ljubljana

Cheap car rent in Ljubljana

Cheapest return flights from Dublin to Ljubljana in September from $231

Return flights