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

Return flights

03 Dec - 09 Dec	Icelandair	direct
03 Dec - 11 Dec	Icelandair	direct
08 Dec - 15 Dec	British Airways
09 Dec - 16 Dec	British Airways
10 Dec - 17 Dec	British Airways
06 Dec - 13 Dec	British Airways
11 Dec - 18 Dec	British Airways
07 Dec - 14 Dec	British Airways
21 Dec - 27 Dec	Icelandair	direct
21 Dec - 01 Jan	Icelandair	direct
23 Dec - 03 Jan	FrenchBee

Also check the deals for one-way flights from Miami to Keflavik 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 Keflavik in December from 338€

Return flights