The calculated distance (air line) between Tsukumiura and Kitakyushu is approximately 80 miles respectively 128 kilometers.
By car or train, the actual journey to Kitakyushu is certainly longer, as only the direct route (as the crow flies) between Tsukumiura and Kitakyushu has been calculated here.
Air line (approximately)
128 kilometers
69 nautical miles