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

Return flights

06 Dec - 15 Dec	SWISS
10 Dec - 17 Dec	SWISS
10 Dec - 15 Dec	SWISS
03 Dec - 10 Dec	SWISS
03 Dec - 11 Dec	SWISS
04 Dec - 09 Dec	SWISS
11 Dec - 23 Dec	SWISS
10 Dec - 23 Dec	SWISS
11 Dec - 22 Dec	SWISS
06 Dec - 14 Dec	SWISS
30 Dec - 13 Jan	SWISS
31 Dec - 21 Jan	SWISS
30 Dec - 31 Jan	SWISS
31 Dec - 23 Jan	SWISS
31 Dec - 24 Jan	SWISS
12 Dec - 14 Jan	SWISS
12 Dec - 13 Jan	SWISS
04 Dec - 06 Jan	SWISS
30 Dec - 11 Jan	SWISS
31 Dec - 11 Jan	SWISS

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

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 December from $602

Return flights