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

Return flights

16 Sep - 14 Oct	SWISS
17 Sep - 07 Oct	Lufthansa
14 Sep - 21 Sep	China Southern
23 Sep - 10 Oct	SWISS
12 Sep - 22 Sep	China Southern
23 Sep - 13 Oct	SWISS
11 Sep - 21 Sep	China Southern
10 Sep - 20 Sep	China Southern
17 Sep - 22 Sep	China Southern
15 Sep - 22 Sep	China Southern
09 Sep - 14 Sep	China Southern
03 Sep - 11 Sep	China Southern
23 Sep - 11 Oct	SWISS
10 Sep - 19 Sep	China Southern
04 Sep - 07 Sep	China Southern
28 Sep - 08 Oct	Etihad Airways
18 Sep - 09 Oct	Etihad Airways
28 Sep - 14 Oct	Etihad Airways
22 Sep - 11 Oct	Lufthansa
23 Sep - 09 Oct	SWISS

Also check the deals for one-way flights from Amsterdam 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 Amsterdam to Seoul in September from $543

Return flights