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

Return flights

12 Sep - 19 Sep	Etihad Airways
02 Sep - 27 Oct	Saudia
01 Sep - 30 Sep	Fly Jinnah
06 Sep - 11 Oct	SalamAir
24 Sep - 31 Oct	Saudia
16 Sep - 24 Oct	Saudia
17 Sep - 11 Oct	Saudia
19 Sep - 20 Oct	Saudia
30 Sep - 14 Oct	Gulf Air
14 Sep - 21 Sep	flyadeal
12 Sep - 24 Oct	Saudia	direct
25 Sep - 11 Oct	Saudia	direct
23 Sep - 17 Oct	Saudia	direct
18 Sep - 27 Sep	Serene Air	direct
09 Sep - 19 Sep	Gulf Air
23 Sep - 29 Sep	Gulf Air
10 Sep - 25 Sep	Gulf Air
12 Sep - 27 Sep	Flynas	direct
06 Sep - 30 Sep	SalamAir
07 Sep - 30 Sep	SalamAir

Also check the deals for one-way flights from Riyadh to Islamabad 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 Riyadh to Islamabad in September from $273

Return flights