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

Return flights

24 Aug - 01 Sep	China Southern
17 Aug - 25 Aug	Air China
17 Aug - 28 Aug	Air China
02 Aug - 06 Aug	China Southern
09 Aug - 13 Aug	China Southern
02 Aug - 08 Aug	China Southern
02 Aug - 22 Aug	China Southern
30 Aug - 05 Sep	China Southern
17 Aug - 30 Aug	Air China
29 Aug - 09 Sep	Air China
22 Aug - 30 Aug	Air China
24 Aug - 29 Aug	China Southern
03 Aug - 13 Aug	China Southern
28 Aug - 09 Sep	ANA
28 Aug - 06 Sep	EVA Air
27 Aug - 07 Sep	ANA
29 Aug - 05 Sep	ANA

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

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 August from $697

Return flights