| Englefield Green to Orbetello | 831.56 mi (1,338.27 km) |
| Englefield Green to Oria | 1,149.57 mi (1,850.05 km) |
| Englefield Green to Oristano | 909.25 mi (1,463.30 km) |
| Englefield Green to Orta Nova | 1,039.39 mi (1,672.73 km) |
| Englefield Green to Orte | 867.95 mi (1,396.83 km) |
| Englefield Green to Ortona | 941.86 mi (1,515.77 km) |
| Englefield Green to Orvieto | 845.28 mi (1,360.34 km) |
| Englefield Green to Orzinuovi | 635.77 mi (1,023.17 km) |
| Englefield Green to Osimo | 853.33 mi (1,373.31 km) |
| Englefield Green to Ospitaletto | 633.15 mi (1,018.95 km) |
| Englefield Green to Ostuni | 1,136.01 mi (1,828.23 km) |
| Englefield Green to Ottaviano | 1,022.50 mi (1,645.56 km) |
| Englefield Green to Ovada | 632.65 mi (1,018.15 km) |
| Englefield Green to Ozieri | 877.29 mi (1,411.86 km) |
| Englefield Green to Paceco | 1,126.87 mi (1,813.53 km) |
