| Towcester to Orbetello | 878.19 mi (1,413.30 km) |
| Towcester to Oria | 1,191.75 mi (1,917.94 km) |
| Towcester to Oristano | 959.72 mi (1,544.53 km) |
| Towcester to Orta Nova | 1,082.53 mi (1,742.16 km) |
| Towcester to Orte | 913.28 mi (1,469.78 km) |
| Towcester to Ortona | 985.09 mi (1,585.35 km) |
| Towcester to Orvieto | 890.59 mi (1,433.27 km) |
| Towcester to Orzinuovi | 679.62 mi (1,093.75 km) |
| Towcester to Osimo | 895.95 mi (1,441.89 km) |
| Towcester to Ospitaletto | 676.48 mi (1,088.69 km) |
| Towcester to Ostuni | 1,177.96 mi (1,895.74 km) |
| Towcester to Ottaviano | 1,067.46 mi (1,717.92 km) |
| Towcester to Ovada | 679.56 mi (1,093.65 km) |
| Towcester to Ozieri | 927.24 mi (1,492.25 km) |
| Towcester to Paceco | 1,175.66 mi (1,892.04 km) |
