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

Return flights

04 Dec - 08 Dec	TAP
03 Dec - 09 Dec	TAP
04 Dec - 09 Dec	TAP
03 Dec - 08 Dec	TAP
03 Dec - 10 Dec	TAP
04 Dec - 10 Dec	TAP
08 Dec - 15 Dec	Air Canada
01 Dec - 12 Dec	Air Canada
01 Dec - 12 Dec	American Airlines	direct
03 Dec - 10 Dec	British Airways	direct
24 Dec - 14 Jan	TAP
24 Dec - 17 Jan	TAP
09 Dec - 06 Jan	Air Canada
09 Dec - 08 Jan	Scandinavian Airlines
29 Dec - 24 Jan	Finnair
10 Dec - 08 Jan	Scandinavian Airlines
10 Dec - 08 Jan	British Airways	direct
09 Dec - 08 Jan	British Airways	direct
24 Dec - 14 Jan	American Airlines	direct
31 Dec - 07 Jan	British Airways	direct

Also check the deals for one-way flights from Miami to London 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 Miami to London in December from $430

Return flights