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

Return flights

16 Sep - 22 Sep	Lufthansa
08 Sep - 15 Sep	SWISS
16 Sep - 23 Sep	SWISS
01 Sep - 09 Sep	SWISS
09 Sep - 25 Sep	SWISS
12 Sep - 15 Sep	SWISS
16 Sep - 24 Sep	SWISS
08 Sep - 29 Sep	SWISS
15 Sep - 22 Sep	SWISS
11 Sep - 16 Sep	SWISS
23 Sep - 07 Oct	SWISS
22 Sep - 14 Oct	SWISS
25 Sep - 06 Oct	SWISS
24 Sep - 01 Oct	Lufthansa
10 Sep - 28 Oct	SWISS
01 Sep - 12 Oct	SWISS
16 Sep - 02 Oct	SWISS
26 Sep - 06 Oct	SWISS
26 Sep - 04 Oct	SWISS
29 Sep - 11 Oct	SWISS

Also check the deals for one-way flights from London to Miami 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 Miami in September from $530

Return flights