The calculated distance (air line) between Grünstadt and Ober-Saulheim is approximately 21 miles respectively 34 kilometers.
By car or train, the actual journey to Ober-Saulheim is certainly longer, as only the direct route (as the crow flies) between Grünstadt and Ober-Saulheim has been calculated here.
Air line (approximately)
34 kilometers
18 nautical miles