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

Return flights

10 May - 16 May	MIAT Mongolian Airlines
22 May - 30 May	Air China
31 May - 16 Jun	Air China
15 May - 21 May	Air China
24 May - 02 Jun	Air China
13 May - 13 Jun	Air China
31 May - 13 Jun	Air China
12 May - 26 May	LOT
05 May - 26 May	LOT
19 May - 26 May	LOT
20 May - 28 May	Air China
16 May - 31 May	China Southern
31 May - 17 Jun	LOT
24 May - 03 Jun	LOT
23 May - 31 May	China Southern
11 May - 19 May	LOT
30 May - 07 Jun	China Southern
11 May - 11 Jun	LOT
08 May - 08 Jun	LOT
21 May - 12 Jun	Etihad 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 429€

Return flights