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

Return flights

27 Aug - 10 Sep	KLM
21 Aug - 06 Sep	Turkish Airlines
21 Aug - 07 Sep	Turkish Airlines
31 Aug - 24 Sep	KLM
22 Aug - 07 Sep	easyJet
19 Aug - 17 Sep	Iberia
29 Aug - 14 Sep	Ryanair
28 Aug - 04 Sep	Eurowings
26 Aug - 10 Sep	KLM
23 Aug - 03 Sep	easyJet
11 Aug - 26 Aug	Turkish Airlines
25 Aug - 30 Aug	easyJet
11 Aug - 18 Aug	Turkish Airlines
12 Aug - 26 Aug	Turkish Airlines
25 Aug - 28 Aug	easyJet
19 Aug - 26 Aug	Finnair
05 Aug - 19 Aug	Iberia
24 Aug - 31 Aug	Ryanair
13 Aug - 24 Aug	Turkish Airlines
22 Aug - 29 Aug	Turkish Airlines

Also check the deals for one-way flights from Duesseldorf 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 Duesseldorf to Seoul in August from $766

Return flights