AirHint found the following cheapest return flights from London (LHR) to Islamabad (ISB) in September 2026 (see full year).

Return flights

16 Sep - 07 Oct	Etihad Airways
20 Sep - 28 Sep	Gulf Air
02 Sep - 01 Oct	Gulf Air
27 Sep - 26 Oct	Gulf Air
02 Sep - 21 Sep	Gulf Air
01 Sep - 30 Sep	Etihad Airways
06 Sep - 27 Sep	Etihad Airways
01 Sep - 20 Sep	Etihad Airways
02 Sep - 27 Sep	Etihad Airways
04 Sep - 29 Sep	Etihad Airways
04 Sep - 18 Sep	Etihad Airways
23 Sep - 30 Sep	Etihad Airways
02 Sep - 23 Sep	Etihad Airways
23 Sep - 11 Oct	Etihad Airways
01 Sep - 15 Oct	Etihad Airways
28 Sep - 11 Oct	Etihad Airways
30 Sep - 22 Oct	Virgin Atlantic
15 Sep - 15 Oct	Qatar Airways
30 Sep - 21 Oct	Virgin Atlantic
30 Sep - 25 Oct	Saudia

Also check the deals for one-way flights from London to Islamabad 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 London to Islamabad in September from $741

Return flights