| Monte San Pietro to Oria | 426.71 mi (686.73 km) |
| Monte San Pietro to Oristano | 341.62 mi (549.79 km) |
| Monte San Pietro to Orta Nova | 314.31 mi (505.84 km) |
| Monte San Pietro to Orte | 150.30 mi (241.89 km) |
| Monte San Pietro to Ortona | 216.83 mi (348.95 km) |
| Monte San Pietro to Orvieto | 128.55 mi (206.88 km) |
| Monte San Pietro to Orzinuovi | 89.84 mi (144.58 km) |
| Monte San Pietro to Osimo | 132.04 mi (212.50 km) |
| Monte San Pietro to Ospitaletto | 93.67 mi (150.74 km) |
| Monte San Pietro to Ostuni | 414.11 mi (666.45 km) |
| Monte San Pietro to Ottaviano | 299.76 mi (482.42 km) |
| Monte San Pietro to Ovada | 126.31 mi (203.27 km) |
| Monte San Pietro to Ozieri | 289.98 mi (466.68 km) |
| Monte San Pietro to Paceco | 452.80 mi (728.71 km) |
| Monte San Pietro to Pachino | 572.50 mi (921.35 km) |
