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

Return flights

02 Dec - 14 Dec	Icelandair
04 Dec - 12 Dec	Icelandair
02 Dec - 10 Dec	Icelandair
06 Dec - 14 Dec	Icelandair
09 Dec - 12 Dec	Icelandair
04 Dec - 07 Dec	Icelandair
02 Dec - 07 Dec	Icelandair
09 Dec - 17 Dec	Icelandair
30 Dec - 13 Jan	SWISS
05 Dec - 12 Dec	SWISS
01 Dec - 12 Dec	SWISS
13 Dec - 25 Jan	TAP
11 Dec - 12 Jan	TAP
29 Dec - 26 Jan	Finnair
16 Dec - 17 Jan	Air Europa
29 Dec - 12 Jan	TAP
29 Dec - 16 Jan	TAP
31 Dec - 12 Jan	TAP
31 Dec - 10 Jan	Finnair
25 Dec - 19 Jan	Finnair

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 373€

Return flights