AirHint found the following cheapest one-way flights from Boston (BOS) to Keflavik (KEF) in March 2026 (see full year).
One-Way flights
| 24 Mar | Spirit Airlines | ||
| 16 Mar | Air France | ||
| 08 Mar | Aer Lingus | ||
| 08 Mar | Icelandair | direct | |
| 24 Mar | Icelandair | direct |
Also check the deals for return flights from Boston to Keflavik in March.
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