| Sidcup to Orbetello | 810.78 mi (1,304.83 km) |
| Sidcup to Oria | 1,125.58 mi (1,811.45 km) |
| Sidcup to Oristano | 893.93 mi (1,438.64 km) |
| Sidcup to Orta Nova | 1,015.95 mi (1,635.02 km) |
| Sidcup to Orte | 846.04 mi (1,361.58 km) |
| Sidcup to Ortona | 918.47 mi (1,478.14 km) |
| Sidcup to Orvieto | 823.36 mi (1,325.07 km) |
| Sidcup to Orzinuovi | 612.75 mi (986.12 km) |
| Sidcup to Osimo | 829.56 mi (1,335.05 km) |
| Sidcup to Ospitaletto | 609.78 mi (981.35 km) |
| Sidcup to Ostuni | 1,111.89 mi (1,789.41 km) |
| Sidcup to Ottaviano | 1,000.32 mi (1,609.86 km) |
| Sidcup to Ovada | 612.15 mi (985.16 km) |
| Sidcup to Ozieri | 860.86 mi (1,385.42 km) |
| Sidcup to Paceco | 1,108.54 mi (1,784.02 km) |
