AirHint found the following cheapest return flights from Belfast (BFS) to Keflavik (KEF) in December 2025 (see full year).
Return flights
| 10 Dec - 17 Dec | easyJet | ||
| 11 Dec - 13 Dec | easyJet | ||
| 08 Dec - 15 Dec | easyJet | ||
| 06 Dec - 08 Dec | Ryanair | ||
| 07 Dec - 13 Dec | Ryanair | ||
| 13 Dec - 18 Dec | Ryanair | ||
| 14 Dec - 19 Dec | Ryanair | ||
| 29 Dec - 02 Jan | Aer Lingus |
Also check the deals for one-way flights from Belfast to Keflavik in December.
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