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

Return flights

07 May - 14 May	MIAT Mongolian Airlines
27 May - 06 Jun	Air China
29 May - 06 Jun	Air China
31 May - 06 Jun	Air China
10 May - 14 May	MIAT Mongolian Airlines
18 May - 02 Jun	Etihad Airways
03 May - 17 May	Pegasus Airlines
10 May - 16 Jun	AirAsia X
26 May - 02 Jun	LOT
21 May - 25 May	LOT
20 May - 28 May	LOT
18 May - 22 May	China Southern
10 May - 02 Jun	Pegasus Airlines
24 May - 02 Jun	Qatar Airways
21 May - 02 Jun	Qatar Airways
27 May - 05 Jun	Qatar Airways
18 May - 27 May	LOT
21 May - 28 May	LOT
17 May - 28 May	LOT
17 May - 27 May	LOT

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

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 May from $567

Return flights