| Sleaford to Devnya | 1,444.10 mi (2,324.05 km) |
| Sleaford to Dimitrovgrad | 1,418.01 mi (2,282.07 km) |
| Sleaford to Dobrich | 1,440.12 mi (2,317.64 km) |
| Sleaford to Dospat | 1,381.73 mi (2,223.68 km) |
| Sleaford to Dupnitsa | 1,313.34 mi (2,113.61 km) |
| Sleaford to Elhovo | 1,450.29 mi (2,334.02 km) |
| Sleaford to Etropole | 1,320.91 mi (2,125.80 km) |
| Sleaford to Gabrovo | 1,371.09 mi (2,206.55 km) |
| Sleaford to Gorna Oryahovitsa | 1,373.79 mi (2,210.90 km) |
| Sleaford to Gotse Delchev | 1,369.35 mi (2,203.75 km) |
| Sleaford to Harmanli | 1,434.92 mi (2,309.28 km) |
| Sleaford to Haskovo | 1,422.05 mi (2,288.56 km) |
| Sleaford to Ihtiman | 1,331.84 mi (2,143.40 km) |
| Sleaford to Isperih | 1,393.91 mi (2,243.28 km) |
| Sleaford to Kardzhali | 1,427.40 mi (2,297.17 km) |
