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

Return flights

22 Sep - 24 Sep	Ryanair
25 Sep - 29 Sep	Ryanair
17 Sep - 20 Sep	Ryanair
08 Sep - 10 Sep	Ryanair
20 Sep - 27 Sep	Ryanair
20 Sep - 01 Oct	Ryanair
27 Sep - 29 Sep	Ryanair
11 Sep - 15 Sep	Ryanair
04 Sep - 15 Sep	Ryanair
22 Sep - 06 Oct	Ryanair
25 Sep - 28 Sep	Ryanair
29 Sep - 06 Oct	Ryanair
14 Sep - 19 Sep	Ryanair
24 Sep - 09 Oct	Ryanair
27 Sep - 04 Oct	Ryanair
22 Sep - 09 Oct	Ryanair
29 Sep - 04 Oct	Ryanair
20 Sep - 04 Oct	Ryanair
27 Sep - 09 Oct	Ryanair
27 Sep - 07 Oct	Ryanair

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 $169

Return flights