| Letchworth to Devnya | 1,417.99 mi (2,282.04 km) |
| Letchworth to Dimitrovgrad | 1,386.08 mi (2,230.69 km) |
| Letchworth to Dobrich | 1,415.31 mi (2,277.72 km) |
| Letchworth to Dospat | 1,346.63 mi (2,167.19 km) |
| Letchworth to Dupnitsa | 1,278.06 mi (2,056.84 km) |
| Letchworth to Elhovo | 1,420.09 mi (2,285.42 km) |
| Letchworth to Etropole | 1,288.50 mi (2,073.64 km) |
| Letchworth to Gabrovo | 1,340.82 mi (2,157.84 km) |
| Letchworth to Gorna Oryahovitsa | 1,344.77 mi (2,164.20 km) |
| Letchworth to Gotse Delchev | 1,333.36 mi (2,145.83 km) |
| Letchworth to Harmanli | 1,403.16 mi (2,258.16 km) |
| Letchworth to Haskovo | 1,389.79 mi (2,236.64 km) |
| Letchworth to Ihtiman | 1,298.12 mi (2,089.12 km) |
| Letchworth to Isperih | 1,368.10 mi (2,201.75 km) |
| Letchworth to Kardzhali | 1,394.15 mi (2,243.67 km) |
