The calculated distance (air line) between Gyula and Székesfehérvár is approximately 141 miles respectively 226 kilometers.
By car or train, the actual journey to Székesfehérvár is certainly longer, as only the direct route (as the crow flies) between Gyula and Székesfehérvár has been calculated here.
Air line (approximately)
226 kilometers
122 nautical miles