| Sliven to Obernburg am Main | 955.27 mi (1,537.36 km) |
| Sliven to Obernkirchen | 1,036.95 mi (1,668.81 km) |
| Sliven to Oberschleissheim | 810.46 mi (1,304.30 km) |
| Sliven to Oberstdorf | 847.01 mi (1,363.13 km) |
| Sliven to Obertraubling | 806.53 mi (1,297.99 km) |
| Sliven to Obertshausen | 974.26 mi (1,567.93 km) |
| Sliven to Oberursel | 988.53 mi (1,590.89 km) |
| Sliven to Ochsenfurt | 912.29 mi (1,468.19 km) |
| Sliven to Ochsenhausen | 875.74 mi (1,409.37 km) |
| Sliven to Ochtrup | 1,104.80 mi (1,778.00 km) |
| Sliven to Odenthal | 1,070.79 mi (1,723.27 km) |
| Sliven to Oelde | 1,056.63 mi (1,700.47 km) |
| Sliven to Oelsnitz | 856.99 mi (1,379.19 km) |
| Sliven to Oer-Erkenschwick | 1,084.17 mi (1,744.81 km) |
| Sliven to Oerlinghausen | 1,042.25 mi (1,677.34 km) |
