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

Return flights

17 Sep - 24 Sep	China Southern
17 Sep - 21 Sep	China Southern
17 Sep - 22 Sep	China Southern
24 Sep - 02 Oct	China Southern
17 Sep - 19 Oct	China Southern
22 Sep - 29 Sep	Emirates
22 Sep - 25 Sep	Emirates
17 Sep - 30 Sep	Finnair
23 Sep - 30 Sep	Lufthansa
24 Sep - 30 Sep	Air France
19 Sep - 24 Sep	Air France
19 Sep - 23 Sep	Air France
29 Sep - 14 Oct	China Eastern
29 Sep - 15 Oct	China Eastern
22 Sep - 02 Oct	China Eastern
17 Sep - 29 Oct	VietJet Air
29 Sep - 12 Oct	China Eastern
22 Sep - 05 Oct	Emirates
27 Sep - 02 Oct	Eastar Jet
26 Sep - 02 Oct	Thai AirAsia X

Also check the deals for one-way flights from Seoul to Amsterdam 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 Seoul to Amsterdam in September from $636

Return flights