| Cayce to Orbetello | 4,791.33 mi (7,710.90 km) |
| Cayce to Oria | 5,146.37 mi (8,282.29 km) |
| Cayce to Oristano | 4,750.77 mi (7,645.63 km) |
| Cayce to Orta Nova | 5,030.80 mi (8,096.29 km) |
| Cayce to Orte | 4,843.50 mi (7,794.86 km) |
| Cayce to Ortona | 4,937.17 mi (7,945.61 km) |
| Cayce to Orvieto | 4,822.72 mi (7,761.41 km) |
| Cayce to Orzinuovi | 4,642.37 mi (7,471.17 km) |
| Cayce to Osimo | 4,858.64 mi (7,819.23 km) |
| Cayce to Ospitaletto | 4,643.79 mi (7,473.46 km) |
| Cayce to Ostuni | 5,135.69 mi (8,265.09 km) |
| Cayce to Ottaviano | 4,991.93 mi (8,033.73 km) |
| Cayce to Ovada | 4,608.45 mi (7,416.59 km) |
| Cayce to Ozieri | 4,748.72 mi (7,642.32 km) |
| Cayce to Paceco | 5,001.03 mi (8,048.39 km) |
