The calculated distance (air line) between Grand-Charmont and Soultz-Haut-Rhin is approximately 31 miles respectively 50 kilometers.
By car or train, the actual journey to Soultz-Haut-Rhin is certainly longer, as only the direct route (as the crow flies) between Grand-Charmont and Soultz-Haut-Rhin has been calculated here.
Air line (approximately)
50 kilometers
27 nautical miles