The calculated distance (air line) between Balatonfüred and Budapest XXI. kerület is approximately 65 miles respectively 105 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 Balatonfüred and Budapest XXI. kerület has been calculated here.
Air line (approximately)
105 kilometers
56 nautical miles