The calculated distance (air line) between Székesfehérvár and Budapest XXI. kerület is approximately 35 miles respectively 57 kilometers.
By car or train, the actual journey to Budapest XXI. kerület is certainly longer, as only the direct route (as the crow flies) between Székesfehérvár and Budapest XXI. kerület has been calculated here.
Air line (approximately)
57 kilometers
31 nautical miles