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

Return flights

29 Sep - 06 Oct	Saudia
30 Sep - 07 Oct	Saudia
24 Sep - 01 Oct	Saudia
18 Sep - 25 Sep	AZAL
25 Sep - 12 Oct	Etihad Airways
23 Sep - 30 Sep	Gulf Air
11 Sep - 30 Sep	Flynas
11 Sep - 23 Sep	Flynas
11 Sep - 16 Oct	Flynas
27 Sep - 04 Oct	Saudia
28 Sep - 05 Oct	Jazeera Airways
27 Sep - 18 Oct	Gulf Air
25 Sep - 02 Oct	Gulf Air
08 Sep - 07 Oct	Flynas
15 Sep - 22 Sep	Gulf Air
08 Sep - 24 Sep	Flynas
11 Sep - 24 Sep	Saudia
08 Sep - 15 Sep	Fly Jinnah
21 Sep - 28 Sep	Emirates
07 Sep - 27 Sep	Flynas

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 $498

Return flights