The calculated distance (air line) between Madhyapur Thimi and Rājbirāj is approximately 115 miles respectively 185 kilometers.
By car or train, the actual journey to Rājbirāj is certainly longer, as only the direct route (as the crow flies) between Madhyapur Thimi and Rājbirāj has been calculated here.
Air line (approximately)
185 kilometers
100 nautical miles