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

Return flights

18 Sep - 16 Oct	British Airways
30 Sep - 06 Oct	Gulf Air
18 Sep - 29 Sep	AZAL
23 Sep - 29 Sep	Gulf Air
28 Sep - 28 Sep	AZAL
30 Sep - 13 Oct	Gulf Air
18 Sep - 27 Sep	AZAL
16 Sep - 29 Sep	Flynas
30 Sep - 07 Oct	Gulf Air
30 Sep - 28 Oct	Gulf Air
15 Sep - 06 Oct	Fly Jinnah
16 Sep - 06 Oct	Flynas
09 Sep - 16 Sep	SalamAir
18 Sep - 20 Sep	AZAL
23 Sep - 07 Oct	Gulf Air
24 Sep - 02 Oct	Flynas
18 Sep - 28 Sep	AZAL
30 Sep - 08 Oct	Gulf Air
15 Sep - 28 Sep	Fly Jinnah
15 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 332€

Return flights