| Sleaford to Cernavoda | 1,416.89 mi (2,280.27 km) |
| Sleaford to Chitila | 1,327.49 mi (2,136.39 km) |
| Sleaford to Cisnadie | 1,206.75 mi (1,942.08 km) |
| Sleaford to Cluj-Napoca | 1,144.98 mi (1,842.67 km) |
| Sleaford to Codlea | 1,259.54 mi (2,027.04 km) |
| Sleaford to Comanesti | 1,273.83 mi (2,050.04 km) |
| Sleaford to Comarnic | 1,284.27 mi (2,066.83 km) |
| Sleaford to Constanta | 1,447.98 mi (2,330.29 km) |
| Sleaford to Corabia | 1,299.28 mi (2,090.98 km) |
| Sleaford to Costesti | 1,276.95 mi (2,055.05 km) |
| Sleaford to Covasna | 1,283.97 mi (2,066.35 km) |
| Sleaford to Craiova | 1,248.65 mi (2,009.51 km) |
| Sleaford to Cristuru Secuiesc | 1,221.02 mi (1,965.04 km) |
| Sleaford to Cugir | 1,170.14 mi (1,883.16 km) |
| Sleaford to Cumpana | 1,446.99 mi (2,328.71 km) |
