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

Return flights

02 Apr - 14 Apr	Air China
09 Apr - 15 Apr	Air China
08 Apr - 15 Apr	Air China
09 Apr - 14 Apr	Air China
09 Apr - 22 Apr	Air China
08 Apr - 21 Apr	Air China
08 Apr - 19 Apr	Air China
16 Apr - 22 Apr	Air China
16 Apr - 19 Apr	Air China
15 Apr - 21 Apr	Air China
20 Apr - 03 May	Air China
26 Apr - 09 May	China Southern
30 Apr - 05 May	Air China
27 Apr - 09 May	China Southern
24 Apr - 02 May	China Southern
29 Apr - 09 May	China Southern
26 Apr - 05 May	China Southern
22 Apr - 04 May	China Southern
24 Apr - 20 May	ANA
24 Apr - 04 May	China Southern

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 415€

Return flights