The calculated distance (air line) between Malaṅgawā and Siddharthanagar is approximately 137 miles respectively 221 kilometers.
By car or train, the actual journey to Siddharthanagar is certainly longer, as only the direct route (as the crow flies) between Malaṅgawā and Siddharthanagar has been calculated here.
Air line (approximately)
221 kilometers
119 nautical miles