| Horstel to Oestrich-Winkel | 159.73 mi (257.06 km) |
| Horstel to Offenburg | 265.10 mi (426.64 km) |
| Horstel to Oftersheim | 206.84 mi (332.88 km) |
| Horstel to Ohrdruf | 169.00 mi (271.99 km) |
| Horstel to Ohringen | 229.75 mi (369.75 km) |
| Horstel to Olbernhau | 271.64 mi (437.17 km) |
| Horstel to Olching | 327.47 mi (527.02 km) |
| Horstel to Oldenburg | 64.13 mi (103.21 km) |
| Horstel to Oldenburg in Holstein | 194.09 mi (312.36 km) |
| Horstel to Olfen | 41.03 mi (66.02 km) |
| Horstel to Olpe | 89.11 mi (143.40 km) |
| Horstel to Olsberg | 75.83 mi (122.04 km) |
| Horstel to Oranienburg | 239.57 mi (385.55 km) |
| Horstel to Ortenberg | 148.37 mi (238.78 km) |
| Horstel to Oschatz | 245.69 mi (395.40 km) |
