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

Return flights

04 Sep - 18 Sep	China Southern
09 Sep - 23 Sep	China Southern
07 Sep - 21 Oct	China Southern
13 Sep - 16 Oct	China Southern
10 Sep - 17 Sep	Thai Airways
12 Sep - 19 Sep	Thai Airways
06 Sep - 18 Oct	China Southern
02 Sep - 27 Oct	Thai Airways
27 Sep - 18 Oct	Thai Airways
28 Sep - 12 Oct	China Southern
27 Sep - 10 Oct	Cebu Pacific
27 Sep - 29 Sep	Etihad Airways
10 Sep - 30 Sep	Etihad Airways
17 Sep - 24 Sep	Emirates

Also check the deals for one-way flights from Seoul 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 Seoul to Islamabad in September from 482€

Return flights