| Ballincollig to Oria | 1,468.19 mi (2,362.82 km) |
| Ballincollig to Oristano | 1,163.97 mi (1,873.23 km) |
| Ballincollig to Orta Nova | 1,354.80 mi (2,180.34 km) |
| Ballincollig to Orte | 1,174.38 mi (1,889.98 km) |
| Ballincollig to Ortona | 1,257.79 mi (2,024.23 km) |
| Ballincollig to Orvieto | 1,152.12 mi (1,854.15 km) |
| Ballincollig to Orzinuovi | 953.29 mi (1,534.16 km) |
| Ballincollig to Osimo | 1,172.77 mi (1,887.39 km) |
| Ballincollig to Ospitaletto | 952.83 mi (1,533.42 km) |
| Ballincollig to Ostuni | 1,455.64 mi (2,342.62 km) |
| Ballincollig to Ottaviano | 1,329.02 mi (2,138.86 km) |
| Ballincollig to Ovada | 934.17 mi (1,503.41 km) |
| Ballincollig to Ozieri | 1,141.96 mi (1,837.81 km) |
| Ballincollig to Paceco | 1,401.77 mi (2,255.94 km) |
| Ballincollig to Pachino | 1,558.94 mi (2,508.87 km) |
