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

Return flights

11 Sep - 29 Sep	PIA
11 Sep - 17 Sep	PIA
14 Sep - 19 Sep	flyadeal
19 Sep - 26 Sep	flyadeal
12 Sep - 21 Sep	flyadeal
16 Sep - 27 Sep	Flynas
19 Sep - 24 Sep	flyadeal
15 Sep - 29 Sep	PIA
09 Sep - 16 Sep	PIA
11 Sep - 23 Sep	PIA
19 Sep - 13 Oct	flyadeal
21 Sep - 10 Oct	flyadeal
18 Sep - 13 Oct	Flynas
23 Sep - 01 Oct	Flynas
21 Sep - 20 Oct	flyadeal
22 Sep - 05 Oct	PIA
19 Sep - 11 Oct	flyadeal
15 Sep - 16 Oct	PIA
30 Sep - 11 Oct	PIA
13 Sep - 06 Oct	PIA

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 422€

Return flights