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

Return flights

23 Oct - 31 Oct	China Southern
21 Oct - 27 Oct	China Southern
21 Oct - 29 Oct	China Southern
23 Oct - 29 Oct	China Southern
23 Oct - 03 Nov	China Southern
28 Oct - 07 Nov	China Southern
18 Oct - 31 Oct	China Southern
16 Oct - 24 Oct	China Southern
14 Oct - 22 Oct	China Southern
29 Oct - 08 Nov	Air China
19 Oct - 08 Nov	Air China
26 Oct - 13 Nov	Air China
19 Oct - 25 Oct	Air China
17 Oct - 28 Oct	Air China
01 Oct - 07 Oct	Air China
22 Oct - 01 Nov	Air China
27 Oct - 07 Nov	ANA
29 Oct - 07 Nov	ANA
27 Oct - 09 Nov	ANA

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

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 Istanbul to Seoul in October from $590

Return flights