| Castalla to Nasaud | 1,395.02 mi (2,245.06 km) |
| Castalla to Navodari | 1,557.94 mi (2,507.26 km) |
| Castalla to Negresti-Oas | 1,363.71 mi (2,194.68 km) |
| Castalla to Nehoiu | 1,454.07 mi (2,340.10 km) |
| Castalla to Ocna Mures | 1,353.66 mi (2,178.50 km) |
| Castalla to Odobesti | 1,495.05 mi (2,406.06 km) |
| Castalla to Odorheiu Secuiesc | 1,419.23 mi (2,284.03 km) |
| Castalla to Oltenita | 1,459.00 mi (2,348.03 km) |
| Castalla to Onesti | 1,487.02 mi (2,393.13 km) |
| Castalla to Oradea | 1,279.36 mi (2,058.93 km) |
| Castalla to Orastie | 1,313.83 mi (2,114.41 km) |
| Castalla to Oravita | 1,229.28 mi (1,978.34 km) |
| Castalla to Orsova | 1,258.56 mi (2,025.45 km) |
| Castalla to Otelu Rosu | 1,268.63 mi (2,041.66 km) |
| Castalla to Otopeni | 1,434.75 mi (2,309.01 km) |
