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

Return flights

07 Sep - 15 Sep	Air China
08 Sep - 17 Sep	Air China
07 Sep - 17 Sep	Air China
09 Sep - 17 Sep	Air China
01 Sep - 08 Sep	Air China
01 Sep - 10 Sep	Air China
16 Sep - 22 Sep	Air China
15 Sep - 23 Sep	Air China
06 Sep - 14 Sep	China Southern
06 Sep - 15 Sep	China Southern
10 Sep - 20 Oct	Air China
07 Sep - 12 Oct	China Southern
10 Sep - 18 Oct	Air China
29 Sep - 06 Oct	Air China
26 Sep - 04 Oct	Air China
30 Sep - 11 Oct	Air China
18 Sep - 10 Oct	China Southern
30 Sep - 08 Oct	China Southern
30 Sep - 10 Oct	China Southern
19 Sep - 10 Oct	ANA

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

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 September from 551€

Return flights