| Ratingen to Oerlinghausen | 90.51 mi (145.65 km) |
| Ratingen to Oestrich-Winkel | 102.98 mi (165.73 km) |
| Ratingen to Offenburg | 201.61 mi (324.46 km) |
| Ratingen to Oftersheim | 153.69 mi (247.34 km) |
| Ratingen to Ohrdruf | 171.70 mi (276.32 km) |
| Ratingen to Ohringen | 186.42 mi (300.01 km) |
| Ratingen to Olbernhau | 285.28 mi (459.12 km) |
| Ratingen to Olching | 292.54 mi (470.79 km) |
| Ratingen to Oldenburg | 139.86 mi (225.09 km) |
| Ratingen to Oldenburg in Holstein | 267.03 mi (429.74 km) |
| Ratingen to Olfen | 36.81 mi (59.24 km) |
| Ratingen to Olpe | 46.89 mi (75.46 km) |
| Ratingen to Olsberg | 70.60 mi (113.63 km) |
| Ratingen to Oranienburg | 289.40 mi (465.74 km) |
| Ratingen to Ortenberg | 116.26 mi (187.11 km) |
