AirHint found the following cheapest return flights from Ljubljana (LJU) to Keflavik (KEF) in September 2026 (see full year).
Return flights
| 01 Sep - 08 Sep | Lufthansa | ||
| 04 Sep - 13 Sep | Lufthansa | ||
| 12 Sep - 19 Sep | Lufthansa |
Also check the deals for one-way flights from Ljubljana to Keflavik in September.
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