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

Return flights

03 Dec - 12 Dec	China Southern
09 Dec - 12 Dec	Air China
04 Dec - 07 Dec	Air China
16 Dec - 28 Dec	Air China
06 Dec - 14 Dec	Air China
06 Dec - 12 Dec	Air China
13 Dec - 17 Dec	Air China
04 Dec - 12 Dec	Air China
10 Dec - 23 Dec	Etihad Airways
10 Dec - 16 Dec	Etihad Airways
24 Dec - 01 Jan	Emirates
29 Dec - 06 Jan	Emirates
29 Dec - 01 Jan	Emirates
31 Dec - 06 Jan	Emirates
24 Dec - 12 Jan	Emirates
18 Dec - 16 Jan	Air China
24 Dec - 07 Jan	Emirates
17 Dec - 12 Jan	Emirates
31 Dec - 05 Jan	Emirates
28 Dec - 01 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 $424

Return flights