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

Return flights

10 Sep - 17 Sep	China Eastern
17 Sep - 24 Sep	Air China
19 Sep - 26 Sep	Air China
10 Sep - 25 Sep	Air China
08 Sep - 16 Sep	SWISS
08 Sep - 14 Sep	SWISS
08 Sep - 22 Sep	SWISS
17 Sep - 23 Sep	Scandinavian Airlines
10 Sep - 26 Sep	Air China
24 Sep - 01 Oct	Air China
17 Sep - 28 Sep	Air China
10 Sep - 01 Oct	China Eastern
22 Sep - 01 Oct	China Eastern
17 Sep - 02 Oct	Scandinavian Airlines
17 Sep - 03 Oct	Scandinavian Airlines
15 Sep - 02 Oct	Scandinavian Airlines
22 Sep - 22 Oct	Air China
20 Sep - 31 Oct	Asiana Airlines
07 Sep - 26 Oct	Jeju Air
17 Sep - 15 Oct	China Eastern

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 531€

Return flights