| Sleaford to Sestu | 1,047.91 mi (1,686.45 km) |
| Sleaford to Settimo Torinese | 656.54 mi (1,056.60 km) |
| Sleaford to Seveso | 664.50 mi (1,069.41 km) |
| Sleaford to Sezze | 1,011.71 mi (1,628.20 km) |
| Sleaford to Siano | 1,099.27 mi (1,769.10 km) |
| Sleaford to Siena | 858.05 mi (1,380.91 km) |
| Sleaford to Signa | 825.11 mi (1,327.88 km) |
| Sleaford to Silea | 762.78 mi (1,227.57 km) |
| Sleaford to Silvi Paese | 984.34 mi (1,584.15 km) |
| Sleaford to Sinalunga | 875.40 mi (1,408.82 km) |
| Sleaford to Siniscola | 980.35 mi (1,577.72 km) |
| Sleaford to Sinnai | 1,049.98 mi (1,689.78 km) |
| Sleaford to Siracusa | 1,334.77 mi (2,148.10 km) |
| Sleaford to Solaro | 664.53 mi (1,069.46 km) |
| Sleaford to Soliera | 767.01 mi (1,234.39 km) |
