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

Return flights

04 Dec - 07 Dec	Air China
19 Dec - 27 Dec	China Southern
05 Dec - 09 Dec	China Southern
19 Dec - 03 Jan	China Southern
05 Dec - 11 Dec	China Southern
08 Dec - 18 Dec	China Southern
15 Dec - 25 Dec	China Southern
08 Dec - 23 Dec	China Southern
12 Dec - 18 Dec	China Southern
31 Dec - 20 Jan	China Southern
26 Dec - 03 Jan	China Southern
24 Dec - 06 Jan	China Southern
24 Dec - 03 Jan	China Southern
09 Dec - 14 Dec	Air China
11 Dec - 14 Dec	Air China
23 Dec - 05 Jan	ANA
20 Dec - 02 Jan	Air China
28 Dec - 14 Jan	ANA
25 Dec - 04 Jan	Air China
28 Dec - 05 Jan	ANA

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 $556

Return flights