AirHint found the following cheapest one-way flights from Keflavik (KEF) to Madrid (MAD) in September 2026 (see full year).
One-Way flights
| 19 Sep | Wizz Air Malta | ||
| 06 Sep | easyJet | ||
| 27 Sep | easyJet | ||
| 06 Sep | Iberia Express | direct |
Also check the deals for return flights from Keflavik to Madrid in September.
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