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

Return flights

26 May - 28 May	Air China
23 May - 27 May	Air China
21 May - 26 May	Air China
12 May - 19 May	Air China
13 May - 26 May	Air China
14 May - 28 May	Air China
16 May - 11 Jun	Air China
14 May - 21 May	Air China
18 May - 28 May	Air China
19 May - 26 May	Air China
18 May - 01 Jun	China Southern
25 May - 02 Jun	China Southern
22 May - 01 Jun	China Southern
11 May - 14 May	Air China
23 May - 02 Jun	Air China
20 May - 02 Jun	China Southern
10 May - 04 Jun	China Southern
10 May - 09 Jun	China Southern
27 May - 04 Jun	China Southern
31 May - 06 Jun	China Southern

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 $500

Return flights