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

Return flights

09 Sep - 16 Sep	China Southern
23 Sep - 30 Sep	China Southern
23 Sep - 21 Oct	Air China
11 Sep - 18 Sep	China Southern
13 Sep - 25 Sep	China Southern
25 Sep - 21 Oct	China Southern
25 Sep - 02 Oct	China Southern
29 Sep - 03 Oct	Thai Airways
26 Sep - 29 Sep	Thai Airways
22 Sep - 29 Sep	Thai Airways
26 Sep - 18 Oct	Thai Airways
26 Sep - 17 Oct	Thai Airways
26 Sep - 15 Oct	Thai Airways
25 Sep - 25 Oct	Thai Airways
25 Sep - 29 Sep	Thai Airways
25 Sep - 18 Oct	Thai Airways
21 Sep - 23 Sep	China Southern
19 Sep - 13 Oct	Thai Airways
15 Sep - 19 Sep	Thai Airways
11 Sep - 15 Sep	Thai Airways

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 $629

Return flights