| Alton to Devnya | 1,436.70 mi (2,312.14 km) |
| Alton to Dimitrovgrad | 1,399.09 mi (2,251.62 km) |
| Alton to Dobrich | 1,435.25 mi (2,309.81 km) |
| Alton to Dospat | 1,356.40 mi (2,182.92 km) |
| Alton to Dupnitsa | 1,287.82 mi (2,072.54 km) |
| Alton to Elhovo | 1,434.78 mi (2,309.05 km) |
| Alton to Etropole | 1,301.24 mi (2,094.14 km) |
| Alton to Gabrovo | 1,355.61 mi (2,181.64 km) |
| Alton to Gorna Oryahovitsa | 1,360.80 mi (2,190.00 km) |
| Alton to Gotse Delchev | 1,342.22 mi (2,160.09 km) |
| Alton to Harmanli | 1,416.30 mi (2,279.31 km) |
| Alton to Haskovo | 1,402.44 mi (2,257.01 km) |
| Alton to Ihtiman | 1,309.47 mi (2,107.39 km) |
| Alton to Isperih | 1,387.21 mi (2,232.50 km) |
| Alton to Kardzhali | 1,405.78 mi (2,262.39 km) |
