| Viersen to Navodari | 1,131.29 mi (1,820.64 km) |
| Viersen to Negresti-Oas | 796.03 mi (1,281.09 km) |
| Viersen to Nehoiu | 997.61 mi (1,605.49 km) |
| Viersen to Ocna Mures | 859.91 mi (1,383.90 km) |
| Viersen to Odobesti | 1,014.97 mi (1,633.44 km) |
| Viersen to Odorheiu Secuiesc | 922.61 mi (1,484.80 km) |
| Viersen to Oltenita | 1,059.11 mi (1,704.48 km) |
| Viersen to Onesti | 986.14 mi (1,587.05 km) |
| Viersen to Oradea | 756.74 mi (1,217.86 km) |
| Viersen to Orastie | 851.80 mi (1,370.84 km) |
| Viersen to Oravita | 822.92 mi (1,324.37 km) |
| Viersen to Orsova | 863.81 mi (1,390.17 km) |
| Viersen to Otelu Rosu | 830.09 mi (1,335.90 km) |
| Viersen to Otopeni | 1,017.89 mi (1,638.13 km) |
| Viersen to Ovidiu | 1,131.01 mi (1,820.18 km) |
