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

Return flights

08 Apr - 14 Apr	Air China
08 Apr - 21 Apr	Air China
08 Apr - 15 Apr	Air China
08 Apr - 19 Apr	Air China
08 Apr - 12 Apr	Air China
01 Apr - 08 Apr	Air China
01 Apr - 14 Apr	Air China
15 Apr - 23 Apr	Air China
04 Apr - 16 Apr	Air China
08 Apr - 20 Apr	China Southern
20 Apr - 03 May	Air China
20 Apr - 14 May	China Southern
26 Apr - 02 May	China Southern
18 Apr - 03 May	Air China
27 Apr - 03 May	Air China
19 Apr - 04 May	China Southern
20 Apr - 04 May	China Southern
27 Apr - 02 May	China Southern
30 Apr - 08 May	Air China
30 Apr - 10 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.

Book a cheap hotel in Istanbul

Cheap car rent in Istanbul

Cheapest return flights from Seoul to Istanbul in April from $501

Return flights