Loutra Ipati is only 17 km from Lamia and 65 km from Karpenisi, while the distance from Athens is 237 km and from Thessaloniki 320 km.
You can travel by bus to Lamia, and there you can change buses and come to Loutra.
Moreover, the railway station of Lianokladi is very close (just 9 km). From the railway station to Loutra you can either take a bus or one of the local taxis.