| Horstel to Navodari | 1,106.51 mi (1,780.76 km) |
| Horstel to Negresti-Oas | 763.88 mi (1,229.35 km) |
| Horstel to Nehoiu | 973.24 mi (1,566.29 km) |
| Horstel to Ocna Mures | 835.93 mi (1,345.29 km) |
| Horstel to Odobesti | 986.85 mi (1,588.18 km) |
| Horstel to Odorheiu Secuiesc | 895.55 mi (1,441.25 km) |
| Horstel to Oltenita | 1,039.99 mi (1,673.69 km) |
| Horstel to Onesti | 956.17 mi (1,538.81 km) |
| Horstel to Oradea | 733.66 mi (1,180.71 km) |
| Horstel to Orastie | 832.76 mi (1,340.20 km) |
| Horstel to Oravita | 813.28 mi (1,308.84 km) |
| Horstel to Orsova | 853.56 mi (1,373.67 km) |
| Horstel to Otelu Rosu | 815.51 mi (1,312.43 km) |
| Horstel to Otopeni | 998.02 mi (1,606.16 km) |
| Horstel to Ovidiu | 1,106.56 mi (1,780.84 km) |
