| Kardzhali to Oestrich-Winkel | 1,011.97 mi (1,628.61 km) |
| Kardzhali to Offenburg | 969.31 mi (1,559.96 km) |
| Kardzhali to Oftersheim | 968.67 mi (1,558.92 km) |
| Kardzhali to Ohrdruf | 940.93 mi (1,514.28 km) |
| Kardzhali to Ohringen | 926.66 mi (1,491.31 km) |
| Kardzhali to Olbernhau | 846.31 mi (1,362.00 km) |
| Kardzhali to Olching | 820.97 mi (1,321.23 km) |
| Kardzhali to Oldenburg | 1,123.31 mi (1,807.80 km) |
| Kardzhali to Oldenburg in Holstein | 1,096.74 mi (1,765.03 km) |
| Kardzhali to Olfen | 1,095.01 mi (1,762.24 km) |
| Kardzhali to Olpe | 1,053.06 mi (1,694.73 km) |
| Kardzhali to Olsberg | 1,041.55 mi (1,676.21 km) |
| Kardzhali to Oranienburg | 952.71 mi (1,533.24 km) |
| Kardzhali to Ortenberg | 983.64 mi (1,583.01 km) |
| Kardzhali to Oschatz | 883.57 mi (1,421.97 km) |
