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

Return flights

10 Sep - 27 Sep	Flynas
10 Sep - 20 Sep	Flynas
10 Sep - 30 Sep	Flynas
16 Sep - 23 Sep	Flynas
15 Sep - 20 Sep	Flynas
11 Sep - 16 Sep	PIA
16 Sep - 21 Sep	Flynas
11 Sep - 28 Sep	PIA
26 Sep - 29 Sep	PIA
17 Sep - 30 Sep	Fly Jinnah
26 Sep - 01 Oct	PIA
17 Sep - 10 Oct	PIA
18 Sep - 10 Oct	PIA
28 Sep - 03 Oct	PIA
30 Sep - 13 Oct	Fly Jinnah
29 Sep - 12 Oct	PIA
29 Sep - 10 Oct	PIA
20 Sep - 13 Oct	Etihad Airways
24 Sep - 22 Oct	Fly Jinnah
13 Sep - 13 Oct	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 459€

Return flights