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

Return flights

10 Sep - 25 Sep	British Airways
06 Sep - 11 Oct	British Airways
06 Sep - 27 Sep	British Airways
08 Sep - 22 Sep	SWISS
10 Sep - 30 Sep	British Airways
10 Sep - 17 Sep	British Airways
10 Sep - 08 Oct	British Airways
04 Sep - 18 Sep	British Airways
10 Sep - 24 Sep	British Airways
23 Sep - 11 Oct	Eurowings
12 Sep - 05 Oct	Eurowings
28 Sep - 05 Oct	Aegean Airlines
22 Sep - 29 Sep	British Airways
18 Sep - 30 Sep	British Airways
13 Sep - 21 Sep	SWISS
25 Sep - 11 Oct	British Airways
28 Sep - 23 Oct	SWISS
24 Sep - 08 Oct	British Airways
17 Sep - 17 Oct	British Airways
18 Sep - 04 Oct	Eurowings

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 $564

Return flights