The calculated distance (air line) between Arba Minch and Mīzan Teferī is approximately 150 miles respectively 242 kilometers.
By car or train, the actual journey to Mīzan Teferī is certainly longer, as only the direct route (as the crow flies) between Arba Minch and Mīzan Teferī has been calculated here.
Air line (approximately)
242 kilometers
130 nautical miles