| Sleaford to Cocentaina | 984.65 mi (1,584.64 km) |
| Sleaford to Coin | 1,147.55 mi (1,846.80 km) |
| Sleaford to Colindres | 677.66 mi (1,090.58 km) |
| Sleaford to Collado-Villalba | 870.65 mi (1,401.17 km) |
| Sleaford to Colmenar Viejo | 866.77 mi (1,394.93 km) |
| Sleaford to Colmenarejo | 875.66 mi (1,409.23 km) |
| Sleaford to Conil de la Frontera | 1,188.10 mi (1,912.07 km) |
| Sleaford to Consuegra | 947.24 mi (1,524.44 km) |
| Sleaford to Corbera de Llobregat | 807.46 mi (1,299.47 km) |
| Sleaford to Cordoba | 1,064.84 mi (1,713.70 km) |
| Sleaford to Coria del Rio | 1,119.00 mi (1,800.85 km) |
| Sleaford to Crevillente | 1,019.12 mi (1,640.12 km) |
| Sleaford to Cuarte de Huerva | 788.89 mi (1,269.59 km) |
| Sleaford to Cubellas | 820.13 mi (1,319.88 km) |
| Sleaford to Cuellar | 821.49 mi (1,322.06 km) |
