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

Return flights

08 Sep - 22 Sep	SWISS
11 Sep - 22 Sep	SWISS
12 Sep - 29 Sep	Eurowings
12 Sep - 24 Sep	Eurowings
19 Sep - 02 Oct	Eurowings
06 Sep - 11 Oct	British Airways
17 Sep - 24 Sep	SWISS
12 Sep - 05 Oct	Eurowings
06 Sep - 27 Sep	British Airways
18 Sep - 11 Oct	British Airways
10 Sep - 30 Sep	British Airways
06 Sep - 28 Sep	Eurowings
10 Sep - 08 Oct	British Airways
10 Sep - 24 Sep	British Airways
04 Sep - 22 Sep	British Airways
23 Sep - 11 Oct	Eurowings
10 Sep - 03 Oct	British Airways
28 Sep - 05 Oct	Aegean Airlines
04 Sep - 03 Oct	British Airways
17 Sep - 17 Oct	British Airways

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 429€

Return flights