| Caldicot to Orbetello | 909.48 mi (1,463.67 km) |
| Caldicot to Oria | 1,234.84 mi (1,987.28 km) |
| Caldicot to Oristano | 972.62 mi (1,565.29 km) |
| Caldicot to Orta Nova | 1,123.43 mi (1,807.99 km) |
| Caldicot to Orte | 948.57 mi (1,526.57 km) |
| Caldicot to Ortona | 1,025.91 mi (1,651.05 km) |
| Caldicot to Orvieto | 925.97 mi (1,490.21 km) |
| Caldicot to Orzinuovi | 719.60 mi (1,158.08 km) |
| Caldicot to Osimo | 938.43 mi (1,510.26 km) |
| Caldicot to Ospitaletto | 717.77 mi (1,155.14 km) |
| Caldicot to Ostuni | 1,221.60 mi (1,965.97 km) |
| Caldicot to Ottaviano | 1,103.53 mi (1,775.96 km) |
| Caldicot to Ovada | 710.58 mi (1,143.57 km) |
| Caldicot to Ozieri | 943.79 mi (1,518.88 km) |
| Caldicot to Paceco | 1,197.78 mi (1,927.63 km) |
