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

Return flights

09 Sep - 24 Sep	KLM
01 Sep - 12 Sep	SWISS
08 Sep - 22 Sep	Lufthansa
10 Sep - 16 Sep	KLM
10 Sep - 17 Sep	KLM
04 Sep - 11 Sep	KLM
11 Sep - 17 Sep	KLM
15 Sep - 22 Sep	SWISS
16 Sep - 03 Oct	ITA Airways
03 Sep - 07 Sep	KLM
01 Sep - 08 Sep	KLM
09 Sep - 09 Oct	KLM
16 Sep - 01 Oct	KLM
25 Sep - 09 Oct	KLM
23 Sep - 22 Oct	British Airways
30 Sep - 29 Oct	British Airways
24 Sep - 08 Oct	KLM
19 Sep - 05 Oct	KLM
20 Sep - 08 Oct	KLM
25 Sep - 14 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 564€

Return flights