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

Return flights

29 Sep - 04 Oct	Ryanair
06 Sep - 13 Sep	Ryanair
25 Sep - 29 Sep	Ryanair
09 Sep - 16 Sep	Ryanair
06 Sep - 15 Sep	Ryanair
15 Sep - 24 Sep	Ryanair
29 Sep - 01 Oct	Ryanair
08 Sep - 16 Sep	Ryanair
06 Sep - 14 Sep	Ryanair
13 Sep - 16 Sep	Ryanair
09 Sep - 15 Sep	Ryanair
25 Sep - 30 Sep	Ryanair
26 Sep - 01 Oct	Ryanair
29 Sep - 01 Oct	Finnair	direct
26 Sep - 01 Oct	Finnair	direct
29 Sep - 04 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 145€

Return flights