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

Return flights

17 Sep - 24 Sep	Japan Airlines
17 Sep - 01 Oct	Japan Airlines
03 Sep - 09 Sep	Japan Airlines
25 Sep - 28 Sep	Japan Airlines
16 Sep - 24 Sep	Japan Airlines
22 Sep - 25 Sep	Japan Airlines
15 Sep - 22 Sep	Japan Airlines
14 Sep - 21 Sep	Japan Airlines

Also check the deals for one-way flights from Seoul 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 Seoul to Helsinki in September from $1842

Return flights