| Smolyan to Obernburg am Main | 939.72 mi (1,512.33 km) |
| Smolyan to Obernkirchen | 1,037.67 mi (1,669.96 km) |
| Smolyan to Oberschleissheim | 788.87 mi (1,269.57 km) |
| Smolyan to Oberstdorf | 814.96 mi (1,311.55 km) |
| Smolyan to Obertraubling | 792.90 mi (1,276.05 km) |
| Smolyan to Obertshausen | 959.58 mi (1,544.30 km) |
| Smolyan to Oberursel | 974.20 mi (1,567.82 km) |
| Smolyan to Ochsenfurt | 897.75 mi (1,444.79 km) |
| Smolyan to Ochsenhausen | 848.48 mi (1,365.50 km) |
| Smolyan to Ochtrup | 1,100.27 mi (1,770.71 km) |
| Smolyan to Odenthal | 1,058.71 mi (1,703.82 km) |
| Smolyan to Oelde | 1,052.10 mi (1,693.20 km) |
| Smolyan to Oelsnitz | 854.75 mi (1,375.58 km) |
| Smolyan to Oer-Erkenschwick | 1,076.29 mi (1,732.13 km) |
| Smolyan to Oerlinghausen | 1,039.89 mi (1,673.54 km) |
