AirHint found the following cheapest return flights from Raleigh-durham (RDU) to Keflavik (KEF) in December 2025 (see full year).
Return flights
| 12 Dec - 14 Dec | Breeze Airways | ||
| 11 Dec - 13 Dec | Frontier Airlines | ||
| 20 Dec - 27 Dec | Frontier Airlines | ||
| 26 Dec - 30 Dec | Frontier Airlines | ||
| 29 Dec - 04 Jan | Spirit Airlines | ||
| 21 Dec - 03 Jan | Frontier Airlines |
Also check the deals for one-way flights from Raleigh-durham to Keflavik in December.
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