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

Return flights

30 Sep - 30 Oct	Lufthansa
23 Sep - 29 Sep	KLM
25 Sep - 29 Sep	KLM
30 Sep - 07 Oct	easyJet
30 Sep - 01 Oct	easyJet
29 Sep - 06 Oct	KLM
10 Sep - 24 Sep	Pegasus Airlines
23 Sep - 26 Sep	easyJet
16 Sep - 23 Sep	Air France
10 Sep - 17 Sep	AJet
20 Sep - 22 Sep	KLM
16 Sep - 18 Sep	AJet
19 Sep - 22 Sep	KLM
16 Sep - 22 Sep	Air France
29 Sep - 01 Oct	easyJet
29 Sep - 04 Oct	easyJet
25 Sep - 16 Oct	KLM
25 Sep - 02 Oct	Lufthansa
30 Sep - 05 Oct	easyJet
30 Sep - 30 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 203€

Return flights