| Southport to Orbetello | 1,011.60 mi (1,628.01 km) |
| Southport to Oria | 1,320.75 mi (2,125.54 km) |
| Southport to Oristano | 1,093.47 mi (1,759.77 km) |
| Southport to Orta Nova | 1,212.71 mi (1,951.66 km) |
| Southport to Orte | 1,045.70 mi (1,682.90 km) |
| Southport to Ortona | 1,115.45 mi (1,795.15 km) |
| Southport to Orvieto | 1,023.02 mi (1,646.40 km) |
| Southport to Orzinuovi | 810.97 mi (1,305.13 km) |
| Southport to Osimo | 1,025.74 mi (1,650.77 km) |
| Southport to Ospitaletto | 807.34 mi (1,299.29 km) |
| Southport to Ostuni | 1,306.69 mi (2,102.91 km) |
| Southport to Ottaviano | 1,199.48 mi (1,930.37 km) |
| Southport to Ovada | 813.23 mi (1,308.76 km) |
| Southport to Ozieri | 1,061.39 mi (1,708.15 km) |
| Southport to Paceco | 1,309.98 mi (2,108.21 km) |
