The calculated distance (air line) between Eppstein and Bad Soden am Taunus is approximately 5 miles respectively 8 kilometers.
By car or train, the actual journey to Bad Soden am Taunus is certainly longer, as only the direct route (as the crow flies) between Eppstein and Bad Soden am Taunus has been calculated here.
Air line (approximately)
8 kilometers
4 nautical miles