| Monfalcone to Octeville | 751.82 mi (1,209.94 km) |
| Monfalcone to Oignies | 582.48 mi (937.42 km) |
| Monfalcone to Oissel | 628.54 mi (1,011.54 km) |
| Monfalcone to Olivet | 567.45 mi (913.22 km) |
| Monfalcone to Ollioules | 420.97 mi (677.49 km) |
| Monfalcone to Olonne-sur-Mer | 733.01 mi (1,179.66 km) |
| Monfalcone to Oloron-Sainte-Marie | 718.68 mi (1,156.60 km) |
| Monfalcone to Onet Village | 542.37 mi (872.86 km) |
| Monfalcone to Onnaing | 556.66 mi (895.86 km) |
| Monfalcone to Orange | 441.36 mi (710.30 km) |
| Monfalcone to Orchies | 573.13 mi (922.36 km) |
| Monfalcone to Orleans | 567.55 mi (913.38 km) |
| Monfalcone to Orly | 559.83 mi (900.97 km) |
| Monfalcone to Ormesson-sur-Marne | 554.38 mi (892.18 km) |
| Monfalcone to Orsay | 567.88 mi (913.92 km) |
