| Nagykallo to Navodari | 406.64 mi (654.42 km) |
| Nagykallo to Negresti-Oas | 72.96 mi (117.42 km) |
| Nagykallo to Nehoiu | 274.26 mi (441.38 km) |
| Nagykallo to Ocna Mures | 139.88 mi (225.12 km) |
| Nagykallo to Odobesti | 286.63 mi (461.29 km) |
| Nagykallo to Odorheiu Secuiesc | 195.20 mi (314.15 km) |
| Nagykallo to Oltenita | 348.60 mi (561.02 km) |
| Nagykallo to Onesti | 257.21 mi (413.94 km) |
| Nagykallo to Oradea | 56.14 mi (90.35 km) |
| Nagykallo to Orastie | 154.28 mi (248.29 km) |
| Nagykallo to Oravita | 196.59 mi (316.38 km) |
| Nagykallo to Orsova | 219.75 mi (353.65 km) |
| Nagykallo to Otelu Rosu | 165.11 mi (265.72 km) |
| Nagykallo to Otopeni | 306.08 mi (492.59 km) |
| Nagykallo to Ovidiu | 406.88 mi (654.81 km) |
