| Petersburg to Orbetello | 4,492.23 mi (7,229.54 km) |
| Petersburg to Oria | 4,846.51 mi (7,799.71 km) |
| Petersburg to Oristano | 4,455.66 mi (7,170.69 km) |
| Petersburg to Orta Nova | 4,730.99 mi (7,613.79 km) |
| Petersburg to Orte | 4,543.94 mi (7,312.77 km) |
| Petersburg to Ortona | 4,636.98 mi (7,462.50 km) |
| Petersburg to Orvieto | 4,523.03 mi (7,279.11 km) |
| Petersburg to Orzinuovi | 4,341.11 mi (6,986.34 km) |
| Petersburg to Osimo | 4,557.84 mi (7,335.14 km) |
| Petersburg to Ospitaletto | 4,342.37 mi (6,988.37 km) |
| Petersburg to Ostuni | 4,835.66 mi (7,782.24 km) |
| Petersburg to Ottaviano | 4,693.04 mi (7,552.72 km) |
| Petersburg to Ovada | 4,308.19 mi (6,933.37 km) |
| Petersburg to Ozieri | 4,452.56 mi (7,165.70 km) |
| Petersburg to Paceco | 4,706.19 mi (7,573.87 km) |
