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

Return flights

23 Aug - 31 Aug	PIA
20 Aug - 27 Aug	PIA
26 Aug - 09 Sep	PIA
04 Aug - 08 Aug	PIA
01 Aug - 15 Aug	PIA
04 Aug - 11 Aug	PIA
04 Aug - 12 Aug	PIA
29 Aug - 05 Sep	SalamAir
19 Aug - 31 Aug	Flynas
18 Aug - 31 Aug	Flynas
04 Aug - 10 Aug	PIA
04 Aug - 28 Aug	PIA
27 Aug - 02 Sep	Flynas
18 Aug - 05 Sep	Flynas
14 Aug - 30 Sep	Flynas
22 Aug - 02 Sep	SalamAir
15 Aug - 30 Sep	SalamAir
29 Aug - 05 Sep	PIA	direct
14 Aug - 30 Sep	Turkish Airlines	direct
15 Aug - 30 Sep	Turkish Airlines	direct

Also check the deals for one-way flights from Islamabad to Istanbul in August.

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 August from 330€

Return flights