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

Return flights

16 Sep - 28 Sep	Flynas
16 Sep - 30 Sep	Flynas
25 Sep - 02 Oct	Gulf Air
11 Sep - 19 Sep	Flynas
15 Sep - 28 Sep	PIA
09 Sep - 14 Sep	Flynas
17 Sep - 30 Sep	Fly Jinnah
29 Sep - 02 Oct	Flynas
14 Sep - 12 Oct	Flynas
24 Sep - 01 Oct	Flynas
23 Sep - 03 Oct	Gulf Air
11 Sep - 03 Oct	Flynas
18 Sep - 13 Oct	Gulf Air
05 Sep - 30 Sep	PIA
27 Sep - 04 Oct	Fly Jinnah
13 Sep - 03 Oct	Gulf Air
07 Sep - 09 Oct	Flynas
16 Sep - 29 Sep	Flynas
09 Sep - 23 Sep	Flynas
10 Sep - 18 Sep	Fly Jinnah

Also check the deals for one-way flights from Islamabad to London 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 Islamabad to London in September from 448€

Return flights