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

Return flights

03 Dec - 08 Dec	TAP
03 Dec - 09 Dec	TAP
04 Dec - 10 Dec	TAP
03 Dec - 10 Dec	TAP
02 Dec - 09 Dec	TAP
02 Dec - 08 Dec	TAP
05 Dec - 08 Dec	TAP
04 Dec - 07 Dec	TAP
04 Dec - 13 Dec	TAP
04 Dec - 17 Dec	TAP
24 Dec - 17 Jan	TAP
01 Dec - 14 Jan	Iberia
23 Dec - 10 Jan	Scandinavian Airlines
12 Dec - 07 Jan	Icelandair
29 Dec - 24 Jan	Air Canada
13 Dec - 18 Jan	Scandinavian Airlines
28 Dec - 17 Jan	TAP
01 Dec - 14 Jan	Finnair	direct
29 Dec - 13 Jan	Air Canada
26 Dec - 17 Jan	TAP

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 $365

Return flights