| Hwlffordd to Orbetello | 994.64 mi (1,600.73 km) |
| Hwlffordd to Oria | 1,325.17 mi (2,132.65 km) |
| Hwlffordd to Oristano | 1,045.88 mi (1,683.18 km) |
| Hwlffordd to Orta Nova | 1,212.93 mi (1,952.02 km) |
| Hwlffordd to Orte | 1,035.71 mi (1,666.81 km) |
| Hwlffordd to Ortona | 1,115.53 mi (1,795.27 km) |
| Hwlffordd to Orvieto | 1,013.22 mi (1,630.61 km) |
| Hwlffordd to Orzinuovi | 809.59 mi (1,302.91 km) |
| Hwlffordd to Osimo | 1,028.93 mi (1,655.91 km) |
| Hwlffordd to Ospitaletto | 808.32 mi (1,300.86 km) |
| Hwlffordd to Ostuni | 1,312.18 mi (2,111.75 km) |
| Hwlffordd to Ottaviano | 1,190.72 mi (1,916.28 km) |
| Hwlffordd to Ovada | 796.40 mi (1,281.68 km) |
| Hwlffordd to Ozieri | 1,019.74 mi (1,641.12 km) |
| Hwlffordd to Paceco | 1,276.60 mi (2,054.49 km) |
