The calculated distance (air line) between São Mateus do Maranhão and São Luís is approximately 105 miles respectively 169 kilometers.
By car or train, the actual journey to São Luís is certainly longer, as only the direct route (as the crow flies) between São Mateus do Maranhão and São Luís has been calculated here.
Air line (approximately)
169 kilometers
91 nautical miles