| Sleaford to Oberkirch | 482.09 mi (775.84 km) |
| Sleaford to Obernburg am Main | 465.35 mi (748.91 km) |
| Sleaford to Obernkirchen | 402.54 mi (647.83 km) |
| Sleaford to Oberschleissheim | 617.92 mi (994.44 km) |
| Sleaford to Oberstdorf | 609.30 mi (980.57 km) |
| Sleaford to Obertraubling | 612.84 mi (986.28 km) |
| Sleaford to Obertshausen | 445.54 mi (717.02 km) |
| Sleaford to Oberursel | 430.97 mi (693.58 km) |
| Sleaford to Ochsenfurt | 507.47 mi (816.69 km) |
| Sleaford to Ochsenhausen | 567.24 mi (912.88 km) |
| Sleaford to Ochtrup | 323.55 mi (520.70 km) |
| Sleaford to Odenthal | 347.51 mi (559.26 km) |
| Sleaford to Oelde | 369.46 mi (594.59 km) |
| Sleaford to Oelsnitz | 566.45 mi (911.62 km) |
| Sleaford to Oer-Erkenschwick | 336.73 mi (541.92 km) |
