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

Return flights

28 Sep - 02 Oct	China Eastern
24 Sep - 01 Oct	China Eastern
25 Sep - 01 Oct	China Eastern
24 Sep - 06 Oct	Lufthansa
29 Sep - 01 Oct	China Eastern
24 Sep - 27 Sep	Thai Airways
29 Sep - 02 Oct	China Eastern
28 Sep - 01 Oct	China Eastern
24 Sep - 02 Oct	China Eastern
24 Sep - 30 Sep	China Eastern
29 Sep - 04 Oct	China Eastern
29 Sep - 16 Oct	Jeju Air
24 Sep - 29 Sep	Thai Airways
25 Sep - 28 Sep	China Eastern
26 Sep - 30 Sep	Thai AirAsia X
28 Sep - 30 Sep	China Eastern
25 Sep - 30 Sep	Eastar Jet
24 Sep - 28 Sep	China Eastern
24 Sep - 26 Sep	China Eastern
26 Sep - 28 Sep	Thai AirAsia X

Also check the deals for one-way flights from Seoul to Barcelona 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 Barcelona in September from 592€

Return flights