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It is approx. 80km away.
The best way to get there is either by car, which would be about 1h drive or with the local buses (called KTEL).
There are several busses daily going from Ioannina to Preveza and back.
For route planning visit http://www.ktelioannina.gr
The bus is actually starting from Ioannina and the final destination is Preveza. Louros is on the route, 25km before reaching Preveza. So when booking your ticket state that you are going to Louros.
Hope this helps