| Monfalcone to Oerlinghausen | 479.78 mi (772.12 km) |
| Monfalcone to Oestrich-Winkel | 386.97 mi (622.76 km) |
| Monfalcone to Offenburg | 321.17 mi (516.87 km) |
| Monfalcone to Oftersheim | 337.57 mi (543.26 km) |
| Monfalcone to Ohrdruf | 370.40 mi (596.11 km) |
| Monfalcone to Ohringen | 300.96 mi (484.35 km) |
| Monfalcone to Olbernhau | 336.38 mi (541.35 km) |
| Monfalcone to Olching | 195.96 mi (315.36 km) |
| Monfalcone to Oldenburg | 560.43 mi (901.93 km) |
| Monfalcone to Oldenburg in Holstein | 598.83 mi (963.73 km) |
| Monfalcone to Olfen | 495.18 mi (796.92 km) |
| Monfalcone to Olpe | 444.98 mi (716.12 km) |
| Monfalcone to Olsberg | 447.35 mi (719.94 km) |
| Monfalcone to Oranienburg | 480.69 mi (773.59 km) |
| Monfalcone to Ortenberg | 376.43 mi (605.80 km) |
