AirHint found the following cheapest return flights from Porto (OPO) to Keflavik (KEF) in September 2026 (see full year).
Return flights
| 01 Sep - 08 Sep | Vueling Airlines | ||
| 18 Sep - 25 Sep | Transavia France | ||
| 03 Sep - 10 Sep | Iberia |
Also check the deals for one-way flights from Porto to Keflavik in September.
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