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

Return flights

01 Sep - 17 Sep	Eurowings
01 Sep - 08 Sep	Eurowings
12 Sep - 21 Sep	Eurowings
01 Sep - 18 Sep	Eurowings
11 Sep - 18 Sep	Eurowings
03 Sep - 07 Sep	Eurowings
13 Sep - 24 Sep	Lufthansa
02 Sep - 17 Sep	Lufthansa
01 Sep - 16 Sep	Lufthansa
01 Sep - 15 Sep	Lufthansa
12 Sep - 05 Oct	Lufthansa
16 Sep - 12 Oct	Ryanair
30 Sep - 28 Oct	Finnair
27 Sep - 10 Oct	Japan Airlines
28 Sep - 05 Oct	Finnair
28 Sep - 21 Oct	Finnair
30 Sep - 01 Oct	British Airways

Also check the deals for one-way flights from Duesseldorf to Seoul 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 Duesseldorf to Seoul in September from $730

Return flights