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

Return flights

16 Sep - 19 Oct	Wizz Air UK
16 Sep - 02 Oct	Wizz Air UK
17 Sep - 02 Oct	easyJet
09 Sep - 12 Oct	SunExpress
22 Sep - 19 Oct	easyJet
17 Sep - 09 Oct	easyJet
11 Sep - 02 Oct	Wizz Air UK
16 Sep - 09 Oct	easyJet
09 Sep - 02 Oct	Wizz Air UK
24 Sep - 02 Oct	SunExpress
15 Sep - 28 Sep	Wizz Air UK
13 Sep - 18 Sep	Wizz Air UK
16 Sep - 28 Sep	Wizz Air UK
15 Sep - 23 Sep	Wizz Air UK
16 Sep - 30 Sep	Wizz Air UK
13 Sep - 30 Sep	Wizz Air UK
16 Sep - 24 Sep	Wizz Air UK
09 Sep - 18 Sep	Wizz Air UK
16 Sep - 23 Sep	Wizz Air UK
28 Sep - 30 Sep	SunExpress

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 380€

Return flights