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

Return flights

28 Sep - 04 Oct	SalamAir
18 Sep - 30 Sep	Hahn Air Technologies
22 Sep - 30 Sep	Gulf Air
25 Sep - 29 Sep	SalamAir
23 Sep - 30 Sep	SalamAir
18 Sep - 25 Sep	Hahn Air Technologies
10 Sep - 17 Sep	SalamAir
19 Sep - 23 Sep	Hahn Air Technologies
11 Sep - 16 Sep	Hahn Air Technologies
28 Sep - 25 Oct	flydubai
12 Sep - 16 Sep	Hahn Air Technologies
10 Sep - 16 Sep	SalamAir

Also check the deals for one-way flights from Islamabad to Colombo 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 Colombo in September from $489

Return flights