| Sintra to Opwijk | 1,067.97 mi (1,718.74 km) |
| Sintra to Ostend | 1,045.09 mi (1,681.91 km) |
| Sintra to Oud-Heverlee | 1,076.01 mi (1,731.66 km) |
| Sintra to Oud-Turnhout | 1,109.44 mi (1,785.47 km) |
| Sintra to Oudenaarde | 1,044.80 mi (1,681.44 km) |
| Sintra to Oudenburg | 1,045.06 mi (1,681.86 km) |
| Sintra to Oupeye | 1,100.78 mi (1,771.53 km) |
| Sintra to Overijse | 1,069.45 mi (1,721.12 km) |
| Sintra to Overpelt | 1,117.80 mi (1,798.93 km) |
| Sintra to Paal | 1,101.66 mi (1,772.95 km) |
| Sintra to Peer | 1,114.90 mi (1,794.26 km) |
| Sintra to Pepinster | 1,099.84 mi (1,770.02 km) |
| Sintra to Peruwelz | 1,027.35 mi (1,653.36 km) |
| Sintra to Perwez | 1,070.44 mi (1,722.71 km) |
| Sintra to Philippeville | 1,041.68 mi (1,676.43 km) |
