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

Return flights

10 Sep - 17 Sep	Eurowings
09 Sep - 17 Sep	Eurowings
08 Sep - 17 Sep	easyJet
01 Sep - 15 Sep	easyJet
04 Sep - 10 Sep	KLM
22 Sep - 13 Oct	Air France
03 Sep - 10 Sep	KLM
03 Sep - 17 Sep	Eurowings
19 Sep - 01 Oct	Eurowings
16 Sep - 14 Oct	Air France
17 Sep - 24 Sep	KLM
18 Sep - 24 Sep	KLM
14 Sep - 12 Oct	LOT
12 Sep - 26 Sep	Eurowings
22 Sep - 10 Oct	Eurowings
15 Sep - 16 Oct	Lufthansa
18 Sep - 05 Oct	Lufthansa
02 Sep - 18 Oct	Air France
24 Sep - 07 Oct	Lufthansa
28 Sep - 08 Oct	LOT

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 626€

Return flights