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

Return flights

12 Aug - 19 Aug	Eurowings
02 Aug - 08 Sep	Ryanair
22 Aug - 01 Sep	Eurowings
07 Aug - 24 Aug	Ryanair
07 Aug - 25 Aug	Ryanair
07 Aug - 23 Aug	Ryanair
06 Aug - 24 Aug	Pegasus Airlines
02 Aug - 13 Aug	Ryanair
13 Aug - 17 Aug	Turkish Airlines
18 Aug - 03 Sep	Lufthansa
03 Aug - 24 Aug	Eurowings
01 Aug - 24 Aug	Ryanair
01 Aug - 08 Aug	Ryanair
22 Aug - 22 Sep	Lufthansa
23 Aug - 07 Sep	Lufthansa

Also check the deals for one-way flights from Cologne 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 Cologne to Seoul in August from 816€

Return flights