The calculated distance (air line) between Siddharthanagar and Ṭikāpur is approximately 159 miles respectively 256 kilometers.
By car or train, the actual journey to Ṭikāpur is certainly longer, as only the direct route (as the crow flies) between Siddharthanagar and Ṭikāpur has been calculated here.
Air line (approximately)
256 kilometers
138 nautical miles