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

Return flights

03 Apr - 11 Apr	China Southern
17 Apr - 25 Apr	China Southern
01 Apr - 09 Apr	China Southern
13 Apr - 18 Apr	China Southern
22 Apr - 25 Apr	China Southern
13 Apr - 21 Apr	China Southern
25 Apr - 03 May	Air China
24 Apr - 02 May	China Southern
18 Apr - 26 Apr	Air China
22 Apr - 30 Apr	China Southern
20 Apr - 30 Apr	China Southern
14 Apr - 18 Apr	ANA
29 Apr - 05 May	China Southern
27 Apr - 04 May	ANA
25 Apr - 02 May	ANA
24 Apr - 03 May	ANA
30 Apr - 07 May	ANA
30 Apr - 05 May	ANA

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 583€

Return flights