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

Return flights

19 Aug - 02 Sep	Lufthansa
26 Aug - 02 Sep	Lufthansa
25 Aug - 08 Sep	China Southern
27 Aug - 03 Sep	Lufthansa
17 Aug - 26 Aug	KLM
17 Aug - 20 Aug	Air France
23 Aug - 03 Sep	Lufthansa
21 Aug - 31 Aug	KLM
19 Aug - 26 Aug	Lufthansa
20 Aug - 26 Aug	Lufthansa
26 Aug - 30 Aug	Shenzhen Airlines
23 Aug - 30 Aug	China Eastern
28 Aug - 04 Sep	T'way Air
21 Aug - 02 Sep	KLM
20 Aug - 25 Aug	Air France
20 Aug - 27 Aug	Lufthansa
24 Aug - 31 Aug	KLM
25 Aug - 03 Sep	Lufthansa
30 Aug - 05 Sep	Lufthansa
29 Aug - 06 Sep	KLM

Also check the deals for one-way flights from Seoul to Helsinki 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 Seoul to Helsinki in August from 672€

Return flights