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

Return flights

25 Sep - 05 Oct	Japan Airlines
20 Sep - 05 Oct	Japan Airlines
24 Sep - 30 Sep	Japan Airlines
17 Sep - 26 Sep	Japan Airlines
20 Sep - 07 Oct	Japan Airlines
01 Sep - 30 Sep	Japan Airlines
20 Sep - 28 Sep	Japan Airlines
06 Sep - 14 Sep	Japan Airlines
06 Sep - 28 Sep	Japan Airlines
20 Sep - 27 Sep	Japan Airlines
03 Sep - 15 Sep	Japan Airlines
27 Sep - 05 Oct	Japan Airlines
24 Sep - 13 Oct	Japan Airlines
08 Sep - 19 Sep	Japan Airlines
26 Sep - 07 Oct	Japan Airlines
19 Sep - 07 Oct	Japan Airlines
15 Sep - 25 Sep	Japan Airlines
22 Sep - 06 Oct	Japan Airlines
21 Sep - 07 Oct	Japan Airlines
22 Sep - 07 Oct	Japan Airlines

Also check the deals for one-way flights from Taipei 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 Taipei to Helsinki in September from $1363

Return flights