AirHint found the following cheapest return flights from Busan (PUS) to Istanbul (IST) in September 2025 (see full year).

Return flights

04 Sep - 14 Sep	China Eastern
09 Sep - 13 Sep	China Eastern
01 Sep - 30 Sep	Jeju Air
13 Sep - 21 Sep	Air China
11 Sep - 21 Sep	Air China
01 Sep - 05 Sep	Asiana Airlines
01 Sep - 09 Sep	Asiana Airlines
02 Sep - 09 Sep	Asiana Airlines
03 Sep - 09 Sep	Asiana Airlines
03 Sep - 24 Sep	Asiana Airlines
28 Sep - 05 Oct	Jeju Air
29 Sep - 02 Oct	Philippine Airlines
29 Sep - 06 Oct	Korean Air
27 Sep - 03 Oct	Air China
27 Sep - 12 Oct	Air China
30 Sep - 10 Oct	Air China

Also check the deals for one-way flights from Busan to Istanbul in September.

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 Busan to Istanbul in September from 511€

Return flights