AirHint found the following cheapest return flights from Miami (MIA) to Keflavik (KEF) in December 2025 (see full year).
Return flights
| 03 Dec - 11 Dec | Icelandair | direct | |
| 10 Dec - 17 Dec | Hawaiian Airlines | ||
| 21 Dec - 25 Dec | Icelandair | direct | |
| 10 Dec - 03 Jan | TAP | ||
| 31 Dec - 04 Jan | Icelandair | ||
| 29 Dec - 03 Jan | Sun Country Airlines |
Also check the deals for one-way flights from Miami to Keflavik in December.
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