| Reguengos de Monsaraz to Orbetello | 1,021.96 mi (1,644.68 km) |
| Reguengos de Monsaraz to Oria | 1,345.63 mi (2,165.58 km) |
| Reguengos de Monsaraz to Oristano | 868.76 mi (1,398.13 km) |
| Reguengos de Monsaraz to Orta Nova | 1,245.05 mi (2,003.72 km) |
| Reguengos de Monsaraz to Orte | 1,081.29 mi (1,740.17 km) |
| Reguengos de Monsaraz to Ortona | 1,182.31 mi (1,902.74 km) |
| Reguengos de Monsaraz to Orvieto | 1,070.19 mi (1,722.30 km) |
| Reguengos de Monsaraz to Orzinuovi | 1,016.49 mi (1,635.88 km) |
| Reguengos de Monsaraz to Osimo | 1,147.62 mi (1,846.91 km) |
| Reguengos de Monsaraz to Ospitaletto | 1,026.84 mi (1,652.53 km) |
| Reguengos de Monsaraz to Ostuni | 1,342.53 mi (2,160.59 km) |
| Reguengos de Monsaraz to Ottaviano | 1,180.05 mi (1,899.10 km) |
| Reguengos de Monsaraz to Ovada | 938.56 mi (1,510.46 km) |
| Reguengos de Monsaraz to Ozieri | 892.88 mi (1,436.95 km) |
| Reguengos de Monsaraz to Paceco | 1,088.73 mi (1,752.14 km) |
