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