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

Return flights

15 Sep - 17 Sep	Ryanair
22 Sep - 25 Sep	Ryanair
16 Sep - 20 Sep	Ryanair
08 Sep - 15 Sep	Ryanair
17 Sep - 21 Sep	Ryanair
20 Sep - 27 Sep	Ryanair
15 Sep - 22 Sep	Ryanair
29 Sep - 03 Oct	Ryanair
25 Sep - 02 Oct	Ryanair
15 Sep - 21 Sep	Ryanair
17 Sep - 22 Sep	Ryanair
11 Sep - 15 Sep	Ryanair
16 Sep - 24 Oct	Lufthansa
25 Sep - 02 Oct	Finnair	direct
16 Sep - 24 Oct	Finnair	direct

Also check the deals for one-way flights from Helsinki to Dublin 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 Dublin in September from $170

Return flights