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

Return flights

22 Sep - 23 Oct	Hainan Airlines
05 Sep - 16 Sep	Hainan Airlines
29 Sep - 19 Oct	Etihad Airways
08 Sep - 20 Sep	Etihad Airways
03 Sep - 16 Sep	Hainan Airlines
10 Sep - 16 Sep	Hainan Airlines
01 Sep - 09 Sep	Hainan Airlines
15 Sep - 20 Sep	Etihad Airways
12 Sep - 20 Sep	Etihad Airways
01 Sep - 20 Sep	Etihad Airways
01 Sep - 07 Sep	Etihad Airways
08 Sep - 14 Sep	Etihad Airways
28 Sep - 12 Oct	Etihad Airways
08 Sep - 16 Oct	KLM
08 Sep - 09 Oct	KLM
02 Sep - 21 Oct	KLM
29 Sep - 12 Oct	Etihad Airways
29 Sep - 09 Oct	Etihad Airways
28 Sep - 14 Oct	SWISS
30 Sep - 16 Oct	Lufthansa

Also check the deals for one-way flights from Prague 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 Prague to Seoul in September from 505€

Return flights