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

Return flights

01 Sep - 08 Sep	Ryanair
03 Sep - 17 Sep	Ryanair
08 Sep - 22 Sep	Ryanair
11 Sep - 15 Sep	Ryanair
24 Sep - 01 Oct	Ryanair
01 Sep - 13 Sep	Ryanair
03 Sep - 04 Sep	Ryanair
14 Sep - 21 Sep	Ryanair
08 Sep - 13 Sep	Ryanair
25 Sep - 29 Sep	Ryanair
08 Sep - 17 Sep	Ryanair
24 Sep - 06 Oct	Ryanair
29 Sep - 03 Oct	Ryanair
29 Sep - 04 Oct	airBaltic
28 Sep - 03 Oct	airBaltic
27 Sep - 10 Oct	airBaltic
29 Sep - 03 Oct	Finnair	direct
29 Sep - 04 Oct	Finnair	direct
24 Sep - 06 Oct	Finnair	direct
24 Sep - 01 Oct	Finnair	direct

Also check the deals for one-way flights from Frankfurt to Helsinki 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 Frankfurt to Helsinki in September from 147€

Return flights