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

Return flights

10 May - 17 May	MIAT Mongolian Airlines
12 May - 19 May	MIAT Mongolian Airlines
17 May - 28 May	MIAT Mongolian Airlines
17 May - 26 May	Air China
24 May - 02 Jun	Air China
01 May - 14 May	Air China
31 May - 09 Jun	Air China
15 May - 26 May	Air China
24 May - 06 Jun	Air China
12 May - 26 May	LOT
19 May - 26 May	LOT
21 May - 26 May	LOT
25 May - 02 Jun	LOT
26 May - 01 Jun	LOT
13 May - 21 May	Air China
26 May - 10 Jun	LOT
19 May - 03 Jun	LOT
28 May - 11 Jun	Qatar Airways
28 May - 09 Jun	Qatar Airways
28 May - 04 Jun	Qatar Airways

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 $509

Return flights