| Waltham to Olivares | 3,382.31 mi (5,443.30 km) |
| Waltham to Olivenza | 3,296.69 mi (5,305.52 km) |
| Waltham to Olot | 3,641.09 mi (5,859.77 km) |
| Waltham to Onate | 3,390.76 mi (5,456.90 km) |
| Waltham to Onda | 3,583.56 mi (5,767.18 km) |
| Waltham to Onteniente | 3,604.02 mi (5,800.10 km) |
| Waltham to Orihuela | 3,611.93 mi (5,812.85 km) |
| Waltham to Osuna | 3,439.31 mi (5,535.04 km) |
| Waltham to Ourense | 3,156.13 mi (5,079.30 km) |
| Waltham to Oviedo | 3,223.35 mi (5,187.47 km) |
| Waltham to Paiporta | 3,593.38 mi (5,782.99 km) |
| Waltham to Pajara | 3,296.94 mi (5,305.91 km) |
| Waltham to Palafolls | 3,669.25 mi (5,905.08 km) |
| Waltham to Palafrugell | 3,680.21 mi (5,922.73 km) |
| Waltham to Palamos | 3,680.93 mi (5,923.89 km) |
