| Welling to Oerlinghausen | 367.78 mi (591.89 km) |
| Welling to Oestrich-Winkel | 359.30 mi (578.24 km) |
| Welling to Offenburg | 404.25 mi (650.58 km) |
| Welling to Oftersheim | 399.78 mi (643.39 km) |
| Welling to Ohrdruf | 462.13 mi (743.72 km) |
| Welling to Ohringen | 442.23 mi (711.70 km) |
| Welling to Olbernhau | 576.02 mi (927.01 km) |
| Welling to Olching | 547.17 mi (880.58 km) |
| Welling to Oldenburg | 361.41 mi (581.63 km) |
| Welling to Oldenburg in Holstein | 489.58 mi (787.91 km) |
| Welling to Olfen | 312.62 mi (503.11 km) |
| Welling to Olpe | 335.35 mi (539.69 km) |
| Welling to Olsberg | 360.80 mi (580.65 km) |
| Welling to Oranienburg | 563.39 mi (906.69 km) |
| Welling to Ortenberg | 396.87 mi (638.70 km) |
