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

Return flights

21 Sep - 28 Sep	Etihad Airways
21 Sep - 05 Oct	Etihad Airways
21 Sep - 03 Oct	Etihad Airways
24 Sep - 24 Sep	Flynas	direct
20 Sep - 20 Oct	Etihad Airways
20 Sep - 27 Sep	Etihad Airways
20 Sep - 20 Sep	Etihad Airways
27 Sep - 27 Sep	Flynas
24 Sep - 23 Oct	Flynas	direct
23 Sep - 16 Oct	Etihad Airways
18 Sep - 19 Sep	Flynas	direct
17 Sep - 30 Sep	Flynas	direct
18 Sep - 21 Sep	Flynas	direct
20 Sep - 11 Oct	Etihad Airways
26 Sep - 28 Sep	Fly Jinnah
22 Sep - 30 Sep	Fly Jinnah
26 Sep - 17 Oct	Fly Jinnah
26 Sep - 03 Oct	Fly Jinnah
26 Sep - 05 Oct	Fly Jinnah
26 Sep - 12 Oct	Airblue	direct

Also check the deals for one-way flights from Islamabad to Riyadh 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 Riyadh in September from 235€

Return flights