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

Return flights

25 Sep - 02 Oct	AZAL
28 Sep - 04 Oct	Fly Jinnah
24 Sep - 01 Oct	Fly Jinnah
28 Sep - 05 Oct	Fly Jinnah
27 Sep - 04 Oct	Flynas
28 Sep - 29 Sep	Fly Jinnah
28 Sep - 11 Oct	PIA
23 Sep - 30 Sep	Etihad Airways
18 Sep - 07 Oct	AZAL
28 Sep - 10 Oct	Fly Jinnah
25 Sep - 09 Oct	Etihad Airways
24 Sep - 30 Sep	Fly Jinnah
18 Sep - 23 Sep	AZAL
22 Sep - 30 Sep	Flynas
30 Sep - 09 Oct	Fly Jinnah
18 Sep - 28 Sep	AZAL
29 Sep - 30 Sep	Flynas
22 Sep - 23 Sep	Flynas
21 Sep - 25 Sep	Flynas
21 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.

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Cheapest return flights from Islamabad to London in September from $485

Return flights