The calculated distance (air line) between Mariupol and Matveyev Kurgan is approximately 70 miles respectively 113 kilometers.
By car or train, the actual journey to Matveyev Kurgan is certainly longer, as only the direct route (as the crow flies) between Mariupol and Matveyev Kurgan has been calculated here.
Air line (approximately)
113 kilometers
61 nautical miles