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

Return flights

18 Apr - 24 Apr	Air China
14 Apr - 19 Apr	Air China
18 Apr - 22 Apr	Air China
11 Apr - 26 Apr	Air China
28 Apr - 03 May	Air China
09 Apr - 12 Apr	Air China
08 Apr - 12 Apr	China Southern
04 Apr - 14 Apr	China Southern
01 Apr - 12 Apr	China Southern
10 Apr - 19 Apr	China Southern
01 Apr - 16 Apr	China Southern
23 Apr - 05 May	Qatar Airways
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
24 Apr - 01 May	Air Astana
28 Apr - 06 May	Air China
25 Apr - 16 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.

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Cheapest return flights from Seoul to Istanbul in April from $497

Return flights