| Unterwellenborn to Oerlinghausen | 150.10 mi (241.56 km) |
| Unterwellenborn to Oestrich-Winkel | 158.47 mi (255.03 km) |
| Unterwellenborn to Offenburg | 218.27 mi (351.26 km) |
| Unterwellenborn to Oftersheim | 154.94 mi (249.35 km) |
| Unterwellenborn to Ohrdruf | 33.14 mi (53.34 km) |
| Unterwellenborn to Ohringen | 132.72 mi (213.59 km) |
| Unterwellenborn to Olbernhau | 82.84 mi (133.31 km) |
| Unterwellenborn to Olching | 169.97 mi (273.53 km) |
| Unterwellenborn to Oldenburg | 220.01 mi (354.07 km) |
| Unterwellenborn to Oldenburg in Holstein | 252.69 mi (406.66 km) |
| Unterwellenborn to Olfen | 190.33 mi (306.30 km) |
| Unterwellenborn to Olpe | 159.37 mi (256.48 km) |
| Unterwellenborn to Olsberg | 137.21 mi (220.81 km) |
| Unterwellenborn to Oranienburg | 163.92 mi (263.81 km) |
| Unterwellenborn to Ortenberg | 106.93 mi (172.09 km) |
