| Discovery Bay to Orbetello | 6,143.70 mi (9,887.33 km) |
| Discovery Bay to Oria | 6,437.80 mi (10,360.64 km) |
| Discovery Bay to Oristano | 6,204.36 mi (9,984.95 km) |
| Discovery Bay to Orta Nova | 6,336.23 mi (10,197.17 km) |
| Discovery Bay to Orte | 6,176.82 mi (9,940.63 km) |
| Discovery Bay to Ortona | 6,240.47 mi (10,043.07 km) |
| Discovery Bay to Orvieto | 6,154.18 mi (9,904.19 km) |
| Discovery Bay to Orzinuovi | 5,940.59 mi (9,560.46 km) |
| Discovery Bay to Osimo | 6,149.58 mi (9,896.79 km) |
| Discovery Bay to Ospitaletto | 5,935.95 mi (9,553.00 km) |
| Discovery Bay to Ostuni | 6,422.64 mi (10,336.25 km) |
| Discovery Bay to Ottaviano | 6,329.37 mi (10,186.14 km) |
| Discovery Bay to Ovada | 5,945.15 mi (9,567.79 km) |
| Discovery Bay to Ozieri | 6,179.90 mi (9,945.59 km) |
| Discovery Bay to Paceco | 6,436.49 mi (10,358.52 km) |
