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

Return flights

24 Sep - 03 Oct	Wizz Air UK
24 Sep - 21 Oct	Wizz Air UK
04 Sep - 25 Sep	Wizz Air UK
09 Sep - 16 Sep	Wizz Air UK
24 Sep - 30 Sep	Wizz Air UK
24 Sep - 16 Oct	Wizz Air UK
01 Sep - 25 Sep	Wizz Air UK
18 Sep - 25 Sep	Wizz Air UK
24 Sep - 14 Oct	Wizz Air UK
24 Sep - 11 Oct	Wizz Air UK
17 Sep - 25 Sep	Wizz Air UK
08 Sep - 16 Oct	Wizz Air UK
24 Sep - 06 Oct	Wizz Air UK
13 Sep - 22 Oct	Wizz Air UK
17 Sep - 24 Sep	Wizz Air UK
10 Sep - 25 Sep	Wizz Air Malta
03 Sep - 25 Sep	Wizz Air UK
15 Sep - 25 Sep	Wizz Air UK
22 Sep - 21 Oct	Wizz Air UK
01 Sep - 16 Oct	Wizz Air UK

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 432€

Return flights