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

Return flights

29 Oct - 06 Nov	China Southern
31 Oct - 04 Nov	China Southern
31 Oct - 08 Nov	China Southern
15 Oct - 21 Oct	China Southern
27 Oct - 01 Nov	China Southern
15 Oct - 30 Oct	China Southern
22 Oct - 30 Oct	China Southern
22 Oct - 28 Oct	China Southern
22 Oct - 25 Oct	China Southern
20 Oct - 30 Oct	China Southern
20 Oct - 28 Oct	China Southern
17 Oct - 21 Oct	China Southern
28 Oct - 03 Nov	ANA
06 Oct - 21 Oct	China Southern
24 Oct - 29 Oct	ANA
28 Oct - 20 Nov	ANA
25 Oct - 01 Nov	ANA
31 Oct - 07 Nov	ANA
31 Oct - 09 Nov	ANA
30 Oct - 04 Nov	ANA

Also check the deals for one-way flights from Seoul to Istanbul 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 Seoul to Istanbul in October from $576

Return flights