| Helston to Orbetello | 945.36 mi (1,521.41 km) |
| Helston to Oria | 1,287.94 mi (2,072.74 km) |
| Helston to Oristano | 974.03 mi (1,567.55 km) |
| Helston to Orta Nova | 1,173.65 mi (1,888.80 km) |
| Helston to Orte | 990.98 mi (1,594.82 km) |
| Helston to Ortona | 1,077.26 mi (1,733.68 km) |
| Helston to Orvieto | 968.95 mi (1,559.37 km) |
| Helston to Orzinuovi | 775.49 mi (1,248.04 km) |
| Helston to Osimo | 994.18 mi (1,599.99 km) |
| Helston to Ospitaletto | 776.05 mi (1,248.93 km) |
| Helston to Ostuni | 1,275.87 mi (2,053.32 km) |
| Helston to Ottaviano | 1,145.02 mi (1,842.73 km) |
| Helston to Ovada | 750.90 mi (1,208.45 km) |
| Helston to Ozieri | 952.33 mi (1,532.62 km) |
| Helston to Paceco | 1,212.44 mi (1,951.23 km) |
