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

Return flights

18 Sep - 26 Sep	Air China
17 Sep - 25 Sep	Air China
18 Sep - 24 Sep	Air China
19 Sep - 26 Sep	Air China
17 Sep - 24 Sep	Air China
19 Sep - 27 Sep	Air China
09 Sep - 12 Sep	Air China
09 Sep - 16 Sep	Air China
09 Sep - 18 Sep	Air China
17 Sep - 23 Sep	Air China
22 Sep - 02 Oct	Air China
17 Sep - 02 Oct	Air China
24 Sep - 02 Oct	Air China
10 Sep - 03 Oct	Air China
24 Sep - 03 Oct	Air China
25 Sep - 17 Oct	Air China
29 Sep - 06 Oct	China Southern
12 Sep - 03 Oct	Air China
28 Sep - 02 Oct	Air China
28 Sep - 15 Oct	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 495€

Return flights