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

Return flights

03 Dec - 10 Dec	TAP
05 Dec - 10 Dec	Icelandair
04 Dec - 09 Dec	TAP
10 Dec - 17 Jan	TAP
04 Dec - 14 Dec	TAP
04 Dec - 07 Dec	TAP
10 Dec - 14 Dec	TAP
04 Dec - 11 Dec	TAP
10 Dec - 15 Dec	TAP
03 Dec - 14 Dec	TAP
12 Dec - 09 Jan	Icelandair
10 Dec - 16 Dec	Spirit Airlines
30 Dec - 09 Jan	Air Canada
25 Dec - 18 Jan	Scandinavian Airlines
28 Dec - 10 Jan	Air Canada
24 Dec - 16 Jan	Virgin Atlantic	direct
16 Dec - 09 Jan	Virgin Atlantic	direct
23 Dec - 07 Jan	Air Canada
25 Dec - 10 Jan	Air Canada
12 Dec - 09 Jan	Virgin Atlantic	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 316€

Return flights