The calculated distance (air line) between Salgótarján and Kecskemét is approximately 83 miles respectively 133 kilometers.
By car or train, the actual journey to Kecskemét is certainly longer, as only the direct route (as the crow flies) between Salgótarján and Kecskemét has been calculated here.
Air line (approximately)
133 kilometers
72 nautical miles