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

Return flights

09 Dec - 21 Dec	Air China
04 Dec - 26 Dec	Air China
13 Dec - 24 Dec	Air China
16 Dec - 21 Dec	Air China
04 Dec - 24 Dec	Air China
30 Dec - 23 Jan	Air China
11 Dec - 26 Dec	Air China
04 Dec - 10 Dec	Air China
09 Dec - 14 Dec	Air China
20 Dec - 07 Jan	Air China
20 Dec - 21 Dec	Air China
20 Dec - 09 Jan	Air China
18 Dec - 21 Dec	Air China
30 Dec - 04 Jan	Air China
31 Dec - 08 Jan	China Southern
25 Dec - 07 Jan	Air China
26 Dec - 06 Jan	China Southern
26 Dec - 08 Jan	China Southern
29 Dec - 08 Jan	China Southern
29 Dec - 06 Jan	China Southern

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 358€

Return flights