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

Return flights

18 Sep - 30 Sep	AZAL
18 Sep - 30 Oct	AZAL
18 Sep - 25 Sep	AZAL
18 Sep - 01 Oct	AZAL
18 Sep - 02 Oct	AZAL
18 Sep - 09 Oct	AZAL
18 Sep - 19 Oct	AZAL
16 Sep - 06 Oct	Fly Jinnah
16 Sep - 03 Oct	Etihad Airways
25 Sep - 29 Sep	Gulf Air
16 Sep - 16 Oct	Fly Jinnah
18 Sep - 15 Oct	AZAL
16 Sep - 02 Oct	Fly Jinnah
22 Sep - 30 Sep	PIA
23 Sep - 27 Sep	Gulf Air
20 Sep - 30 Sep	Gulf Air
28 Sep - 29 Sep	Etihad Airways
09 Sep - 22 Sep	Fly Jinnah
08 Sep - 15 Sep	Fly Jinnah
24 Sep - 28 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.

Book a cheap hotel in London

Cheap car rent in London

Cheapest return flights from Islamabad to London in September from 391€

Return flights