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

Return flights

08 Sep - 15 Sep	Pegasus Airlines
19 Sep - 31 Oct	AJet
05 Sep - 03 Oct	SunExpress
12 Sep - 03 Oct	Pegasus Airlines
17 Sep - 20 Sep	Ryanair
27 Sep - 08 Oct	AJet
16 Sep - 01 Oct	Pegasus Airlines
11 Sep - 03 Oct	Pegasus Airlines
30 Sep - 20 Oct	AJet
14 Sep - 08 Oct	AJet
04 Sep - 18 Sep	Pegasus Airlines
29 Sep - 19 Oct	Pegasus Airlines
26 Sep - 05 Oct	Pegasus Airlines
11 Sep - 18 Sep	Pegasus Airlines
12 Sep - 25 Sep	Pegasus Airlines
20 Sep - 25 Sep	AJet
04 Sep - 25 Sep	Pegasus Airlines
18 Sep - 25 Sep	Pegasus Airlines
19 Sep - 27 Sep	Pegasus Airlines
04 Sep - 11 Sep	Pegasus Airlines

Also check the deals for one-way flights from London to Karachi 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 Karachi in September from 350€

Return flights