| Southend to Orbetello | 799.09 mi (1,286.02 km) |
| Southend to Oria | 1,109.48 mi (1,785.53 km) |
| Southend to Oristano | 888.59 mi (1,430.05 km) |
| Southend to Orta Nova | 1,000.67 mi (1,610.42 km) |
| Southend to Orte | 832.89 mi (1,340.40 km) |
| Southend to Ortona | 903.30 mi (1,453.72 km) |
| Southend to Orvieto | 810.20 mi (1,303.90 km) |
| Southend to Orzinuovi | 598.33 mi (962.92 km) |
| Southend to Osimo | 813.90 mi (1,309.85 km) |
| Southend to Ospitaletto | 594.89 mi (957.39 km) |
| Southend to Ostuni | 1,095.61 mi (1,763.21 km) |
| Southend to Ottaviano | 986.70 mi (1,587.94 km) |
| Southend to Ovada | 601.04 mi (967.27 km) |
| Southend to Ozieri | 854.31 mi (1,374.88 km) |
| Southend to Paceco | 1,099.62 mi (1,769.66 km) |
