The calculated distance (air line) between Poppenbüttel and Rothenburgsort is approximately 9 miles respectively 14 kilometers.
By car or train, the actual journey to Rothenburgsort is certainly longer, as only the direct route (as the crow flies) between Poppenbüttel and Rothenburgsort has been calculated here.
Air line (approximately)
14 kilometers
8 nautical miles