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

Return flights

15 May - 23 May	China Southern
18 May - 26 May	China Southern
11 May - 02 Jun	China Southern
13 May - 02 Jun	China Southern
11 May - 09 Jun	China Southern
20 May - 26 May	China Southern
12 May - 18 May	ANA
06 May - 23 May	China Southern
06 May - 26 May	China Southern
30 May - 03 Jun	Air China
04 May - 23 May	China Southern
07 May - 10 May	Air China
01 May - 05 May	China Southern
10 May - 16 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 $621

Return flights