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

Return flights

10 Sep - 28 Sep	Flynas
10 Sep - 17 Sep	Flynas
10 Sep - 25 Sep	Flynas
10 Sep - 19 Sep	Flynas
04 Sep - 13 Sep	Flynas
01 Sep - 14 Sep	Flynas
09 Sep - 12 Sep	Flynas
06 Sep - 20 Sep	Flynas
01 Sep - 10 Sep	Flynas
07 Sep - 21 Sep	Flynas
25 Sep - 05 Oct	flydubai
26 Sep - 18 Oct	flydubai
25 Sep - 05 Oct	Turkish Airlines	direct
26 Sep - 18 Oct	Turkish Airlines	direct

Also check the deals for one-way flights from Islamabad 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 Islamabad to Istanbul in September from 339€

Return flights