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

Return flights

23 Jul - 05 Aug	China Eastern
01 Jul - 09 Jul	T'way Air
12 Jul - 17 Jul	China Eastern
14 Jul - 22 Jul	China Southern
02 Jul - 22 Jul	China Southern
01 Jul - 02 Jul	ANA
08 Jul - 14 Jul	ANA
19 Jul - 23 Jul	Air China
20 Jul - 26 Jul	Air China
15 Jul - 23 Jul	Air China
19 Jul - 27 Jul	Air China
22 Jul - 13 Aug	Air China
18 Jul - 03 Aug	Air China
18 Jul - 02 Aug	Air China
20 Jul - 02 Aug	Air China
28 Jul - 28 Aug	China Southern
22 Jul - 15 Aug	Air China
31 Jul - 27 Aug	Air China
04 Jul - 19 Aug	China Southern
02 Jul - 21 Aug	China Southern

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

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 July from $666

Return flights