The calculated distance (air line) between Gafargaon and Kailāshahar is approximately 91 miles respectively 147 kilometers.
By car or train, the actual journey to Kailāshahar is certainly longer, as only the direct route (as the crow flies) between Gafargaon and Kailāshahar has been calculated here.
Air line (approximately)
147 kilometers
79 nautical miles