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

Return flights

23 Sep - 24 Sep	Finnair
29 Sep - 30 Sep	Finnair
29 Sep - 30 Sep	Finnair	direct
26 Sep - 28 Sep	Finnair	direct
23 Sep - 24 Sep	Finnair	direct
27 Sep - 28 Sep	Finnair	direct
26 Sep - 27 Sep	Finnair	direct
18 Sep - 22 Sep	Finnair	direct
20 Sep - 27 Sep	Finnair	direct
19 Sep - 26 Sep	Finnair

Also check the deals for one-way flights from Tallinn 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 Tallinn to Helsinki in September from 157€

Return flights