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

Return flights

17 Sep - 24 Sep	Air China
17 Sep - 26 Oct	Air China
17 Sep - 29 Oct	Air China
21 Sep - 24 Sep	Air China
17 Sep - 25 Sep	Air China
17 Sep - 26 Sep	Air China
17 Sep - 30 Sep	Air China
17 Sep - 21 Oct	Air China
17 Sep - 02 Oct	Air China
17 Sep - 01 Oct	Air China
17 Sep - 28 Oct	Air China
17 Sep - 27 Oct	Air China
17 Sep - 24 Oct	Air China
17 Sep - 30 Oct	Air China
17 Sep - 28 Sep	Air China
17 Sep - 03 Oct	Air China
20 Sep - 23 Sep	Scandinavian Airlines
20 Sep - 26 Sep	Scandinavian Airlines
18 Sep - 23 Sep	Air France
04 Sep - 09 Sep	Air China

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 493€

Return flights