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

Return flights

18 Apr - 26 Apr	Air China
02 Apr - 10 Apr	Air China
14 Apr - 17 Apr	Air China
18 Apr - 24 Apr	Air China
14 Apr - 19 Apr	Air China
18 Apr - 22 Apr	Air China
28 Apr - 03 May	Air China
09 Apr - 12 Apr	Air China
08 Apr - 14 Apr	China Southern
10 Apr - 14 Apr	China Southern
10 Apr - 16 Apr	China Southern
22 Apr - 02 May	China Southern
24 Apr - 02 May	China Southern
25 Apr - 02 May	China Southern
24 Apr - 05 May	Qatar Airways
22 Apr - 01 May	Air Astana
04 Apr - 10 May	Singapore Airlines
28 Apr - 06 May	Air China
25 Apr - 16 May	Air Astana
25 Apr - 05 May	Air Astana

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 424€

Return flights