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

Return flights

31 Aug - 13 Sep	SWISS
31 Aug - 10 Sep	SWISS
29 Aug - 15 Sep	SWISS
29 Aug - 13 Sep	SWISS
30 Aug - 10 Sep	SWISS
30 Aug - 13 Sep	SWISS
30 Aug - 20 Sep	SWISS
31 Aug - 12 Sep	SWISS
30 Aug - 09 Sep	Air Canada
31 Aug - 09 Sep	SWISS
27 Aug - 30 Aug	TAP
25 Aug - 30 Aug	TAP
26 Aug - 30 Aug	Aer Lingus
26 Aug - 31 Aug	Aer Lingus
25 Aug - 31 Aug	TAP
27 Aug - 29 Aug	TAP
25 Aug - 27 Aug	TAP
25 Aug - 26 Aug	TAP
26 Aug - 29 Aug	Aer Lingus
25 Aug - 31 Aug	British Airways	direct

Also check the deals for one-way flights from London to Miami in August.

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 August from $573

Return flights