AirHint found the following cheapest return flights from Seoul (ICN) to Istanbul (IST) in December 2025 (see full year).

Return flights

07 Dec - 11 Dec	China Southern
04 Dec - 11 Dec	China Southern
04 Dec - 08 Dec	China Southern
02 Dec - 10 Dec	China Southern
01 Dec - 11 Dec	China Southern
05 Dec - 12 Dec	China Southern
01 Dec - 12 Dec	China Southern
03 Dec - 06 Dec	China Southern
07 Dec - 10 Dec	China Southern
03 Dec - 10 Dec	China Southern
24 Dec - 20 Jan	Emirates
31 Dec - 13 Jan	Emirates
22 Dec - 08 Jan	Emirates
22 Dec - 01 Jan	Emirates
24 Dec - 01 Jan	Emirates
24 Dec - 14 Jan	Emirates
31 Dec - 14 Jan	Emirates
24 Dec - 07 Jan	Emirates
29 Dec - 07 Jan	Emirates
31 Dec - 12 Jan	Emirates

Also check the deals for one-way flights from Seoul to Istanbul in December.

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 Istanbul in December from 342€

Return flights