| Monfalcone to Oberkirch | 318.00 mi (511.77 km) |
| Monfalcone to Obernburg am Main | 345.46 mi (555.96 km) |
| Monfalcone to Obernkirchen | 489.29 mi (787.43 km) |
| Monfalcone to Oberschleissheim | 192.95 mi (310.52 km) |
| Monfalcone to Oberstdorf | 190.32 mi (306.28 km) |
| Monfalcone to Obertraubling | 227.87 mi (366.73 km) |
| Monfalcone to Obertshausen | 366.24 mi (589.40 km) |
| Monfalcone to Oberursel | 380.69 mi (612.66 km) |
| Monfalcone to Ochsenfurt | 310.92 mi (500.38 km) |
| Monfalcone to Ochsenhausen | 230.73 mi (371.32 km) |
| Monfalcone to Ochtrup | 527.32 mi (848.64 km) |
| Monfalcone to Odenthal | 465.82 mi (749.66 km) |
| Monfalcone to Oelde | 483.18 mi (777.60 km) |
| Monfalcone to Oelsnitz | 325.14 mi (523.26 km) |
| Monfalcone to Oer-Erkenschwick | 494.52 mi (795.86 km) |
