AirHint found the following cheapest return flights from Seoul (GMP) to Istanbul (IST) in October 2026 (see full year).

Return flights

14 Oct - 22 Oct	China Southern
31 Oct - 06 Nov	Air China
09 Oct - 17 Oct	China Southern
02 Oct - 08 Oct	China Southern
09 Oct - 20 Oct	China Southern
07 Oct - 17 Oct	China Southern
07 Oct - 15 Oct	China Southern
12 Oct - 19 Oct	ANA
01 Oct - 07 Oct	ANA
03 Oct - 10 Oct	ANA
08 Oct - 17 Oct	ANA
26 Oct - 02 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 687€

Return flights