Cheapest return flights from Seoul to Istanbul in April from $535

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

Return flights

01 Apr - 07 Apr China Southern
01 Apr - 21 Apr China Southern
01 Apr - 04 Apr China Southern
01 Apr - 16 Apr China Southern
16 Apr - 26 Apr Air China
15 Apr - 19 Apr Air China
14 Apr - 21 Apr Air China
14 Apr - 24 Apr Air China
11 Apr - 24 Apr Air China
14 Apr - 23 Apr Air China
22 Apr - 02 May China Southern
29 Apr - 03 May Air China
25 Apr - 03 May Air China
27 Apr - 13 May Air China
27 Apr - 03 May Air China
20 Apr - 12 May Air China
29 Apr - 02 May China Southern
20 Apr - 11 May China Southern
22 Apr - 01 May Air China
29 Apr - 11 May China Southern

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

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