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

Return flights

11 Sep - 15 Sep	Ryanair
20 Sep - 30 Sep	Ryanair
19 Sep - 22 Sep	Ryanair
25 Sep - 29 Sep	Ryanair
18 Sep - 22 Sep	Ryanair
26 Sep - 29 Sep	Ryanair
13 Sep - 20 Sep	Ryanair
05 Sep - 09 Sep	Ryanair
10 Sep - 13 Sep	Ryanair
24 Sep - 28 Sep	Ryanair
25 Sep - 02 Oct	airBaltic
27 Sep - 02 Oct	airBaltic
28 Sep - 10 Oct	easyJet
25 Sep - 02 Oct	Finnair	direct
28 Sep - 05 Oct	Scandinavian Airlines
28 Sep - 10 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 $183

Return flights