| Sleaford to Karlovo | 1,360.57 mi (2,189.62 km) |
| Sleaford to Karnobat | 1,446.02 mi (2,327.15 km) |
| Sleaford to Kavarna | 1,465.70 mi (2,358.81 km) |
| Sleaford to Kazanlak | 1,384.76 mi (2,228.55 km) |
| Sleaford to Knezha | 1,294.64 mi (2,083.53 km) |
| Sleaford to Kostinbrod | 1,291.64 mi (2,078.70 km) |
| Sleaford to Kozloduy | 1,268.74 mi (2,041.84 km) |
| Sleaford to Kyustendil | 1,296.10 mi (2,085.88 km) |
| Sleaford to Levski | 1,341.45 mi (2,158.86 km) |
| Sleaford to Lom | 1,247.62 mi (2,007.85 km) |
| Sleaford to Lovech | 1,335.29 mi (2,148.94 km) |
| Sleaford to Lukovit | 1,311.02 mi (2,109.89 km) |
| Sleaford to Lyaskovets | 1,375.89 mi (2,214.28 km) |
| Sleaford to Mezdra | 1,295.19 mi (2,084.40 km) |
| Sleaford to Momchilgrad | 1,434.73 mi (2,308.97 km) |
