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

Return flights

18 May - 23 May	China Southern
11 May - 21 May	China Southern
01 May - 09 May	China Southern
02 May - 08 May	Air China
16 May - 24 May	Air China
30 May - 07 Jun	Air China
04 May - 09 May	China Southern
04 May - 12 May	China Southern
22 May - 30 May	China Southern
21 May - 26 May	ANA
23 May - 30 May	ANA

Also check the deals for one-way flights from Seoul to Istanbul 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 Seoul to Istanbul in May from $603

Return flights