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

Return flights

12 Sep - 23 Sep	SWISS
18 Sep - 22 Sep	SWISS
17 Sep - 22 Sep	SWISS
17 Sep - 02 Oct	TAP
16 Sep - 25 Sep	TAP
08 Sep - 22 Sep	TAP
16 Sep - 22 Sep	TAP
17 Sep - 27 Sep	TAP
23 Sep - 06 Oct	TAP
11 Sep - 11 Oct	TAP
04 Sep - 22 Sep	TAP
17 Sep - 30 Oct	TAP
12 Sep - 25 Sep	TAP
24 Sep - 05 Oct	TAP
02 Sep - 29 Sep	TAP
23 Sep - 03 Oct	TAP
08 Sep - 03 Oct	TAP
26 Sep - 06 Oct	TAP
20 Sep - 04 Oct	TAP
10 Sep - 15 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 $490

Return flights