| Sleaford to Olivares | 1,111.17 mi (1,788.26 km) |
| Sleaford to Olivenza | 1,038.71 mi (1,671.64 km) |
| Sleaford to Olot | 759.13 mi (1,221.71 km) |
| Sleaford to Onate | 694.48 mi (1,117.66 km) |
| Sleaford to Onda | 900.55 mi (1,449.30 km) |
| Sleaford to Onteniente | 979.36 mi (1,576.12 km) |
| Sleaford to Orihuela | 1,030.53 mi (1,658.47 km) |
| Sleaford to Osuna | 1,112.21 mi (1,789.93 km) |
| Sleaford to Ourense | 812.97 mi (1,308.35 km) |
| Sleaford to Oviedo | 710.75 mi (1,143.85 km) |
| Sleaford to Paiporta | 937.47 mi (1,508.72 km) |
| Sleaford to Pajara | 1,840.48 mi (2,961.97 km) |
| Sleaford to Palafolls | 796.30 mi (1,281.52 km) |
| Sleaford to Palafrugell | 783.22 mi (1,260.47 km) |
| Sleaford to Palamos | 787.74 mi (1,267.75 km) |
