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

Return flights

18 Aug - 25 Aug	Norwegian Air Sweden AOC
21 Aug - 04 Sep	Finnair
21 Aug - 04 Sep	Finnair	direct
11 Aug - 24 Aug	Norwegian Air Sweden AOC
14 Aug - 21 Aug	Finnair
18 Aug - 25 Aug	Finnair	direct
24 Aug - 28 Aug	Norwegian Air Sweden AOC
11 Aug - 25 Aug	Norwegian Air Sweden AOC
04 Aug - 18 Aug	Norwegian Air Sweden AOC
05 Aug - 26 Aug	Qatar Airways
06 Aug - 13 Aug	Norwegian Air Sweden AOC
19 Aug - 26 Aug	KLM
03 Aug - 03 Sep	KLM

Also check the deals for one-way flights from Helsinki to Seoul in August.

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 Helsinki to Seoul in August from $723

Return flights