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

Return flights

18 Sep - 24 Sep	Air China
18 Sep - 26 Sep	Air China
23 Sep - 01 Oct	Air China
21 Sep - 27 Sep	Air China
24 Sep - 02 Oct	Air France
28 Sep - 02 Oct	Eastar Jet
22 Sep - 29 Sep	Eastar Jet
25 Sep - 30 Sep	T'way Air
25 Sep - 02 Oct	Air France
17 Sep - 24 Sep	T'way Air
25 Sep - 28 Sep	T'way Air
22 Sep - 27 Sep	Eastar Jet
27 Sep - 03 Oct	Eastar Jet
18 Sep - 21 Sep	T'way Air
24 Sep - 04 Oct	Eastar Jet
29 Sep - 12 Oct	China Eastern
26 Sep - 03 Oct	Thai AirAsia X
26 Sep - 04 Oct	Thai AirAsia X
29 Sep - 06 Oct	China Eastern
22 Sep - 30 Sep	KLM

Also check the deals for one-way flights from Seoul to Athens 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 Athens in September from $593

Return flights