| Knjazevac to Opwijk | 995.60 mi (1,602.26 km) |
| Knjazevac to Ostend | 1,053.03 mi (1,694.69 km) |
| Knjazevac to Oud-Heverlee | 972.61 mi (1,565.26 km) |
| Knjazevac to Oud-Turnhout | 974.68 mi (1,568.59 km) |
| Knjazevac to Oudenaarde | 1,015.72 mi (1,634.65 km) |
| Knjazevac to Oudenburg | 1,048.68 mi (1,687.68 km) |
| Knjazevac to Oupeye | 930.32 mi (1,497.20 km) |
| Knjazevac to Overijse | 976.50 mi (1,571.52 km) |
| Knjazevac to Overpelt | 954.85 mi (1,536.68 km) |
| Knjazevac to Paal | 958.78 mi (1,543.00 km) |
| Knjazevac to Peer | 950.78 mi (1,530.13 km) |
| Knjazevac to Pepinster | 919.22 mi (1,479.34 km) |
| Knjazevac to Peruwelz | 1,007.75 mi (1,621.82 km) |
| Knjazevac to Perwez | 960.76 mi (1,546.19 km) |
| Knjazevac to Philippeville | 960.07 mi (1,545.08 km) |
