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

Return flights

03 Apr - 16 Apr	China Southern
13 Apr - 23 Apr	China Southern
05 Apr - 18 Apr	China Southern
08 Apr - 13 Apr	China Southern
13 Apr - 16 Apr	China Southern
08 Apr - 18 Apr	China Southern
12 Apr - 16 Apr	China Southern
01 Apr - 04 Apr	China Southern
08 Apr - 20 Apr	China Southern
13 Apr - 20 Apr	China Southern
20 Apr - 10 May	Air China
20 Apr - 13 May	Air China
22 Apr - 13 May	Air China
18 Apr - 08 May	Air China
29 Apr - 10 May	Air China
30 Apr - 05 May	Air China
27 Apr - 08 May	Air China
29 Apr - 03 May	Air China
23 Apr - 03 May	Air China
21 Apr - 13 May	Air China

Also check the deals for one-way flights from Seoul to Istanbul in April.

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 April from 578€

Return flights