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

Return flights

09 Sep - 12 Sep	KLM
04 Sep - 08 Sep	KLM
05 Sep - 09 Sep	KLM
25 Sep - 28 Sep	KLM
08 Sep - 12 Sep	KLM
18 Sep - 21 Sep	KLM
26 Sep - 03 Oct	airBaltic
08 Sep - 14 Sep	KLM
12 Sep - 14 Sep	Lufthansa
07 Sep - 13 Sep	KLM
07 Sep - 14 Sep	Lufthansa
26 Sep - 03 Oct	Finnair	direct

Also check the deals for one-way flights from Zurich 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 Zurich to Helsinki in September from 202€

Return flights