The calculated distance (air line) between São Luís and Itapecuru Mirim is approximately 60 miles respectively 96 kilometers.
By car or train, the actual journey to Itapecuru Mirim is certainly longer, as only the direct route (as the crow flies) between São Luís and Itapecuru Mirim has been calculated here.
Air line (approximately)
96 kilometers
52 nautical miles