| Erkrath to Navodari | 1,109.21 mi (1,785.10 km) |
| Erkrath to Negresti-Oas | 773.62 mi (1,245.02 km) |
| Erkrath to Nehoiu | 975.52 mi (1,569.95 km) |
| Erkrath to Ocna Mures | 837.82 mi (1,348.34 km) |
| Erkrath to Odobesti | 992.72 mi (1,597.63 km) |
| Erkrath to Odorheiu Secuiesc | 900.39 mi (1,449.03 km) |
| Erkrath to Oltenita | 1,037.35 mi (1,669.45 km) |
| Erkrath to Onesti | 963.82 mi (1,551.12 km) |
| Erkrath to Oradea | 734.67 mi (1,182.33 km) |
| Erkrath to Orastie | 829.99 mi (1,335.73 km) |
| Erkrath to Oravita | 801.82 mi (1,290.41 km) |
| Erkrath to Orsova | 842.67 mi (1,356.15 km) |
| Erkrath to Otelu Rosu | 808.58 mi (1,301.28 km) |
| Erkrath to Otopeni | 996.06 mi (1,603.01 km) |
| Erkrath to Ovidiu | 1,108.94 mi (1,784.67 km) |
