| Sofia to Opwijk | 1,065.36 mi (1,714.53 km) |
| Sofia to Ostend | 1,122.71 mi (1,806.82 km) |
| Sofia to Oud-Heverlee | 1,042.37 mi (1,677.54 km) |
| Sofia to Oud-Turnhout | 1,044.95 mi (1,681.69 km) |
| Sofia to Oudenaarde | 1,085.21 mi (1,746.48 km) |
| Sofia to Oudenburg | 1,118.33 mi (1,799.78 km) |
| Sofia to Oupeye | 1,000.25 mi (1,609.75 km) |
| Sofia to Overijse | 1,046.18 mi (1,683.66 km) |
| Sofia to Overpelt | 1,025.15 mi (1,649.83 km) |
| Sofia to Paal | 1,028.87 mi (1,655.81 km) |
| Sofia to Peer | 1,021.03 mi (1,643.18 km) |
| Sofia to Pepinster | 989.06 mi (1,591.74 km) |
| Sofia to Peruwelz | 1,076.88 mi (1,733.07 km) |
| Sofia to Perwez | 1,030.36 mi (1,658.20 km) |
| Sofia to Philippeville | 1,029.12 mi (1,656.21 km) |
