| Waltham to Orbetello | 4,023.35 mi (6,474.95 km) |
| Waltham to Oria | 4,375.67 mi (7,041.97 km) |
| Waltham to Oristano | 3,995.39 mi (6,429.96 km) |
| Waltham to Orta Nova | 4,260.34 mi (6,856.36 km) |
| Waltham to Orte | 4,074.00 mi (6,556.47 km) |
| Waltham to Ortona | 4,165.56 mi (6,703.81 km) |
| Waltham to Orvieto | 4,052.80 mi (6,522.35 km) |
| Waltham to Orzinuovi | 3,867.40 mi (6,223.97 km) |
| Waltham to Osimo | 4,085.08 mi (6,574.29 km) |
| Waltham to Ospitaletto | 3,868.29 mi (6,225.41 km) |
| Waltham to Ostuni | 4,364.44 mi (7,023.89 km) |
| Waltham to Ottaviano | 4,224.45 mi (6,798.60 km) |
| Waltham to Ovada | 3,836.84 mi (6,174.80 km) |
| Waltham to Ozieri | 3,990.10 mi (6,421.44 km) |
| Waltham to Paceco | 4,246.13 mi (6,833.49 km) |
