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

Return flights

23 Sep - 13 Oct	China Eastern
21 Sep - 10 Oct	China Eastern
28 Sep - 21 Oct	China Southern
30 Sep - 14 Oct	LOT
23 Sep - 11 Oct	Etihad Airways
25 Sep - 19 Oct	Etihad Airways
22 Sep - 29 Sep	China Southern
25 Sep - 18 Oct	China Southern
25 Sep - 13 Oct	China Southern
30 Sep - 15 Oct	LOT
30 Sep - 10 Oct	LOT
16 Sep - 29 Sep	China Southern
22 Sep - 28 Sep	China Southern
21 Sep - 28 Sep	China Southern
18 Sep - 23 Sep	Air India
19 Sep - 29 Sep	IndiGo
18 Sep - 25 Sep	easyJet
26 Sep - 28 Sep	China Southern
16 Sep - 24 Sep	Air India
16 Sep - 22 Sep	China Southern

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 504€

Return flights