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

Return flights

13 Apr - 23 Apr	China Southern
03 Apr - 14 Apr	China Southern
13 Apr - 21 Apr	China Southern
22 Apr - 07 May	China Southern
17 Apr - 07 May	China Southern
10 Apr - 30 Apr	China Southern
29 Apr - 05 May	China Southern
29 Apr - 07 May	China Southern
27 Apr - 05 May	China Southern
30 Apr - 05 May	China Southern
24 Apr - 04 May	ANA
18 Apr - 19 Apr	Air China
02 Apr - 13 Apr	ANA
06 Apr - 13 Apr	ANA
29 Apr - 04 May	ANA
23 Apr - 04 May	ANA
29 Apr - 06 May	ANA
23 Apr - 25 Apr	ANA
10 Apr - 17 Apr	ANA
25 Apr - 30 Apr	ANA

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 $625

Return flights