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

Return flights

18 Sep - 25 Sep	British Airways
03 Sep - 16 Sep	SWISS
09 Sep - 23 Sep	British Airways
01 Sep - 24 Sep	KLM
01 Sep - 30 Sep	KLM
08 Sep - 19 Sep	KLM
01 Sep - 19 Sep	KLM
05 Sep - 17 Sep	KLM
08 Sep - 22 Sep	KLM
05 Sep - 22 Sep	KLM
04 Sep - 09 Oct	SWISS
04 Sep - 01 Oct	SWISS
25 Sep - 20 Oct	SWISS
25 Sep - 08 Oct	SWISS
09 Sep - 01 Oct	SWISS
19 Sep - 10 Oct	SWISS
30 Sep - 01 Oct	SWISS
30 Sep - 07 Oct	SWISS
28 Sep - 09 Oct	SWISS

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 $466

Return flights