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

Return flights

14 Sep - 18 Sep	airBaltic
14 Sep - 21 Sep	airBaltic
07 Sep - 11 Sep	airBaltic
21 Sep - 25 Sep	airBaltic
13 Sep - 18 Sep	airBaltic
06 Sep - 11 Sep	airBaltic
30 Sep - 04 Oct	Finnair	direct
30 Sep - 05 Oct	Finnair
13 Sep - 17 Sep	airBaltic
16 Sep - 18 Sep	Finnair
13 Sep - 14 Sep	airBaltic
20 Sep - 23 Sep	airBaltic

Also check the deals for one-way flights from Helsinki 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 Helsinki to Ljubljana in September from 188€

Return flights