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

Return flights

26 Sep - 04 Oct	Korean Air
27 Sep - 05 Oct	China Eastern
20 Sep - 16 Oct	Japan Airlines
20 Sep - 02 Oct	Japan Airlines
22 Sep - 04 Oct	Japan Airlines
22 Sep - 29 Sep	Japan Airlines
19 Sep - 25 Sep	Japan Airlines
19 Sep - 28 Sep	Japan Airlines
28 Sep - 14 Oct	Japan Airlines
29 Sep - 05 Oct	Japan Airlines
21 Sep - 30 Sep	Japan Airlines
29 Sep - 02 Oct	Japan Airlines
29 Sep - 01 Oct	Japan Airlines

Also check the deals for one-way flights from Seoul to Copenhagen 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 Copenhagen in September from $2026

Return flights