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

Return flights

27 Aug - 01 Sep	Turkish Airlines
27 Aug - 03 Sep	Pegasus Airlines
31 Aug - 04 Sep	AJet
31 Aug - 06 Sep	IndiGo
24 Aug - 04 Sep	IndiGo
30 Aug - 06 Sep	Flynas
31 Aug - 10 Sep	AJet
30 Aug - 02 Sep	Flynas
27 Aug - 06 Sep	AZAL
25 Aug - 11 Sep	IndiGo
24 Aug - 31 Aug	Turkish Airlines
21 Aug - 29 Aug	Centrum Air
21 Aug - 26 Aug	Centrum Air
23 Aug - 31 Aug	Air Astana
24 Aug - 28 Aug	Air Astana
28 Aug - 31 Aug	Air Astana
26 Aug - 30 Aug	Etihad Airways
25 Aug - 31 Aug	Air Astana
23 Aug - 25 Aug	IndiGo
25 Aug - 30 Aug	IndiGo

Also check the deals for one-way flights from Istanbul to Seoul 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 Istanbul to Seoul in August from $602

Return flights