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

Return flights

29 Dec - 11 Jan	China Eastern
31 Dec - 07 Jan	Etihad Airways
30 Dec - 15 Jan	China Southern
30 Dec - 06 Jan	China Southern
31 Dec - 10 Jan	Etihad Airways
29 Dec - 12 Jan	China Eastern
31 Dec - 22 Jan	MIAT Mongolian Airlines
31 Dec - 14 Jan	Etihad Airways
31 Dec - 06 Jan	Emirates
29 Dec - 08 Jan	Emirates
28 Dec - 31 Dec	China Southern
27 Dec - 31 Dec	KLM
26 Dec - 30 Dec	Asiana Airlines	direct
23 Dec - 25 Dec	Asiana Airlines	direct
26 Dec - 29 Dec	KLM
23 Dec - 27 Dec	Asiana Airlines	direct
26 Dec - 31 Dec	KLM
25 Dec - 30 Dec	KLM
24 Dec - 31 Dec	China Southern
26 Dec - 28 Dec	KLM

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 $458

Return flights