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

Return flights

08 Apr - 21 Apr	Air China
06 Apr - 20 Apr	Wizz Air UK
10 Apr - 21 Apr	Air China
15 Apr - 15 May	ANA
01 Apr - 19 Apr	ANA
06 Apr - 19 Apr	ANA
20 Apr - 10 May	ANA
22 Apr - 02 May	Air China
19 Apr - 25 Apr	Air China
08 Apr - 12 Apr	ANA
20 Apr - 26 Apr	ANA
06 Apr - 12 Apr	ANA
12 Apr - 26 Apr	ANA

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

Cheap car rent in Seoul

Cheapest return flights from Istanbul to Seoul in April from $832

Return flights