AirHint found the following cheapest one-way flights from Washington (DCA) to Keflavik (KEF) in December 2025 (see full year).
One-Way flights
| 12 Dec | Frontier Airlines | ||
| 17 Dec | Icelandair | ||
| 18 Dec | Icelandair | ||
| 26 Dec | WestJet |
Also check the deals for return flights from Washington to Keflavik in December.
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