| Sleaford to Collegno | 654.99 mi (1,054.10 km) |
| Sleaford to Cologno al Serio | 684.28 mi (1,101.25 km) |
| Sleaford to Cologno Monzese | 674.93 mi (1,086.19 km) |
| Sleaford to Colorno | 740.14 mi (1,191.14 km) |
| Sleaford to Comacchio | 808.08 mi (1,300.48 km) |
| Sleaford to Comiso | 1,323.63 mi (2,130.17 km) |
| Sleaford to Como | 653.79 mi (1,052.18 km) |
| Sleaford to Concordia Sagittaria | 775.95 mi (1,248.77 km) |
| Sleaford to Concorezzo | 673.22 mi (1,083.45 km) |
| Sleaford to Conegliano | 751.30 mi (1,209.09 km) |
| Sleaford to Conselice | 806.81 mi (1,298.44 km) |
| Sleaford to Conselve | 770.10 mi (1,239.35 km) |
| Sleaford to Conversano | 1,166.01 mi (1,876.51 km) |
| Sleaford to Copertino | 1,234.33 mi (1,986.47 km) |
| Sleaford to Copparo | 786.44 mi (1,265.65 km) |
