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

Return flights

17 Sep - 20 Sep	Wizz Air
26 Sep - 29 Sep	KLM
20 Sep - 23 Sep	KLM
22 Sep - 29 Sep	KLM
16 Sep - 23 Sep	KLM
29 Sep - 07 Oct	KLM
25 Sep - 01 Oct	Lufthansa
25 Sep - 30 Sep	KLM
11 Sep - 17 Sep	Lufthansa
12 Sep - 15 Sep	Lufthansa
10 Sep - 24 Sep	Air France
10 Sep - 23 Sep	Air France
23 Sep - 02 Oct	Lufthansa
25 Sep - 02 Oct	Lufthansa
29 Sep - 03 Oct	Lufthansa
30 Sep - 04 Oct	Lufthansa

Also check the deals for one-way flights from Stuttgart 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 Stuttgart to Helsinki in September from $222

Return flights