AirHint found the following cheapest return flights from Houston (HOU) to Keflavik (KEF) in December 2025 (see full year).
Return flights
| 13 Dec - 20 Dec | Spirit Airlines | ||
| 08 Dec - 16 Dec | Spirit Airlines | ||
| 11 Dec - 21 Dec | Frontier Airlines | ||
| 17 Dec - 10 Jan | Frontier Airlines | ||
| 20 Dec - 10 Jan | jetBlue | ||
| 16 Dec - 02 Jan | Spirit Airlines |
Also check the deals for one-way flights from Houston to Keflavik in December.
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