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

Return flights

17 Sep - 02 Oct	Gulf Air
14 Sep - 23 Sep	Gulf Air
15 Sep - 26 Sep	Wizz Air UK
29 Sep - 27 Oct	Wizz Air UK
17 Sep - 24 Sep	Turkish Airlines
16 Sep - 29 Sep	Turkish Airlines
12 Sep - 30 Sep	Wizz Air UK
10 Sep - 16 Oct	Gulf Air
03 Sep - 02 Oct	Gulf Air
03 Sep - 07 Oct	Gulf Air
24 Sep - 14 Oct	Gulf Air
21 Sep - 30 Sep	Gulf Air
14 Sep - 21 Oct	Gulf Air
10 Sep - 09 Oct	Gulf Air
14 Sep - 11 Oct	Gulf Air
07 Sep - 02 Oct	Gulf Air
03 Sep - 25 Sep	Gulf Air
10 Sep - 30 Sep	Gulf Air
03 Sep - 23 Sep	Gulf Air
16 Sep - 23 Sep	Turkish Airlines

Also check the deals for one-way flights from London 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 London to Islamabad in September from $604

Return flights