| Helmstedt to Oestrich-Winkel | 201.84 mi (324.82 km) |
| Helmstedt to Offenburg | 293.11 mi (471.71 km) |
| Helmstedt to Oftersheim | 224.03 mi (360.54 km) |
| Helmstedt to Ohrdruf | 97.46 mi (156.85 km) |
| Helmstedt to Ohringen | 219.40 mi (353.09 km) |
| Helmstedt to Olbernhau | 147.10 mi (236.73 km) |
| Helmstedt to Olching | 278.64 mi (448.43 km) |
| Helmstedt to Oldenburg | 133.12 mi (214.24 km) |
| Helmstedt to Oldenburg in Holstein | 143.25 mi (230.54 km) |
| Helmstedt to Olfen | 158.37 mi (254.87 km) |
| Helmstedt to Olpe | 159.92 mi (257.37 km) |
| Helmstedt to Olsberg | 123.88 mi (199.36 km) |
| Helmstedt to Oranienburg | 100.47 mi (161.68 km) |
| Helmstedt to Ortenberg | 154.49 mi (248.63 km) |
| Helmstedt to Oschatz | 110.21 mi (177.36 km) |
