The calculated distance (air line) between Thonon-les-Bains and Grenoble is approximately 90 miles respectively 145 kilometers.
By car or train, the actual journey to Grenoble is certainly longer, as only the direct route (as the crow flies) between Thonon-les-Bains and Grenoble has been calculated here.
Air line (approximately)
145 kilometers
78 nautical miles