| Kardzhali to Navodari | 246.91 mi (397.37 km) |
| Kardzhali to Negresti-Oas | 440.12 mi (708.30 km) |
| Kardzhali to Nehoiu | 260.14 mi (418.65 km) |
| Kardzhali to Ocna Mures | 335.93 mi (540.63 km) |
| Kardzhali to Odobesti | 296.82 mi (477.68 km) |
| Kardzhali to Odorheiu Secuiesc | 322.26 mi (518.63 km) |
| Kardzhali to Oltenita | 180.22 mi (290.03 km) |
| Kardzhali to Onesti | 325.96 mi (524.58 km) |
| Kardzhali to Oradea | 411.38 mi (662.06 km) |
| Kardzhali to Orastie | 309.65 mi (498.34 km) |
| Kardzhali to Oravita | 298.41 mi (480.24 km) |
| Kardzhali to Orsova | 259.85 mi (418.19 km) |
| Kardzhali to Otelu Rosu | 306.86 mi (493.85 km) |
| Kardzhali to Otopeni | 203.49 mi (327.48 km) |
| Kardzhali to Ovidiu | 242.53 mi (390.32 km) |
