| Smolyan to Oestrich-Winkel | 989.07 mi (1,591.76 km) |
| Smolyan to Offenburg | 943.93 mi (1,519.10 km) |
| Smolyan to Oftersheim | 945.08 mi (1,520.96 km) |
| Smolyan to Ohrdruf | 921.29 mi (1,482.68 km) |
| Smolyan to Ohringen | 903.33 mi (1,453.76 km) |
| Smolyan to Olbernhau | 828.87 mi (1,333.94 km) |
| Smolyan to Olching | 797.05 mi (1,282.72 km) |
| Smolyan to Oldenburg | 1,105.39 mi (1,778.96 km) |
| Smolyan to Oldenburg in Holstein | 1,082.58 mi (1,742.25 km) |
| Smolyan to Olfen | 1,074.41 mi (1,729.10 km) |
| Smolyan to Olpe | 1,031.67 mi (1,660.31 km) |
| Smolyan to Olsberg | 1,021.10 mi (1,643.29 km) |
| Smolyan to Oranienburg | 938.63 mi (1,510.58 km) |
| Smolyan to Ortenberg | 961.96 mi (1,548.13 km) |
| Smolyan to Oschatz | 867.00 mi (1,395.31 km) |
