The calculated distance (air line) between Lachen-Speyerdorf and Bochum is approximately 155 miles respectively 249 kilometers.
By car or train, the actual journey to Bochum is certainly longer, as only the direct route (as the crow flies) between Lachen-Speyerdorf and Bochum has been calculated here.
Air line (approximately)
249 kilometers
134 nautical miles