| Watervliet to Orbetello | 4,118.80 mi (6,628.57 km) |
| Watervliet to Oria | 4,469.42 mi (7,192.83 km) |
| Watervliet to Oristano | 4,096.15 mi (6,592.11 km) |
| Watervliet to Orta Nova | 4,354.31 mi (7,007.59 km) |
| Watervliet to Orte | 4,168.64 mi (6,708.78 km) |
| Watervliet to Ortona | 4,258.98 mi (6,854.17 km) |
| Watervliet to Orvieto | 4,147.25 mi (6,674.35 km) |
| Watervliet to Orzinuovi | 3,959.10 mi (6,371.56 km) |
| Watervliet to Osimo | 4,177.45 mi (6,722.96 km) |
| Watervliet to Ospitaletto | 3,959.65 mi (6,372.45 km) |
| Watervliet to Ostuni | 4,457.90 mi (7,174.30 km) |
| Watervliet to Ottaviano | 4,319.97 mi (6,952.32 km) |
| Watervliet to Ovada | 3,930.58 mi (6,325.66 km) |
| Watervliet to Ozieri | 4,089.65 mi (6,581.66 km) |
| Watervliet to Paceco | 4,346.82 mi (6,995.52 km) |
