| Nailsea to Orbetello | 902.95 mi (1,453.16 km) |
| Nailsea to Oria | 1,229.66 mi (1,978.95 km) |
| Nailsea to Oristano | 964.21 mi (1,551.75 km) |
| Nailsea to Orta Nova | 1,117.99 mi (1,799.24 km) |
| Nailsea to Orte | 942.49 mi (1,516.79 km) |
| Nailsea to Ortona | 1,020.50 mi (1,642.34 km) |
| Nailsea to Orvieto | 919.92 mi (1,480.46 km) |
| Nailsea to Orzinuovi | 714.25 mi (1,149.47 km) |
| Nailsea to Osimo | 933.28 mi (1,501.96 km) |
| Nailsea to Ospitaletto | 712.59 mi (1,146.81 km) |
| Nailsea to Ostuni | 1,216.50 mi (1,957.76 km) |
| Nailsea to Ottaviano | 1,097.49 mi (1,766.24 km) |
| Nailsea to Ovada | 704.15 mi (1,133.22 km) |
| Nailsea to Ozieri | 935.72 mi (1,505.89 km) |
| Nailsea to Paceco | 1,190.16 mi (1,915.38 km) |
