The calculated distance (air line) between Nishifukuma and Kitakyushu is approximately 22 miles respectively 36 kilometers.
By car or train, the actual journey to Kitakyushu is certainly longer, as only the direct route (as the crow flies) between Nishifukuma and Kitakyushu has been calculated here.
Air line (approximately)
36 kilometers
19 nautical miles