| Quattro Castella to Navodari | 893.04 mi (1,437.21 km) |
| Quattro Castella to Negresti-Oas | 657.24 mi (1,057.73 km) |
| Quattro Castella to Nehoiu | 774.24 mi (1,246.01 km) |
| Quattro Castella to Ocna Mures | 658.90 mi (1,060.39 km) |
| Quattro Castella to Odobesti | 810.49 mi (1,304.36 km) |
| Quattro Castella to Odorheiu Secuiesc | 726.97 mi (1,169.95 km) |
| Quattro Castella to Oltenita | 798.36 mi (1,284.84 km) |
| Quattro Castella to Onesti | 796.74 mi (1,282.24 km) |
| Quattro Castella to Oradea | 575.79 mi (926.65 km) |
| Quattro Castella to Orastie | 624.47 mi (1,004.98 km) |
| Quattro Castella to Oravita | 549.94 mi (885.04 km) |
| Quattro Castella to Orsova | 585.59 mi (942.42 km) |
| Quattro Castella to Otelu Rosu | 582.62 mi (937.63 km) |
| Quattro Castella to Otopeni | 766.58 mi (1,233.69 km) |
| Quattro Castella to Ovidiu | 890.91 mi (1,433.79 km) |
