| Backnang to Devnya | 951.97 mi (1,532.05 km) |
| Backnang to Dimitrovgrad | 913.86 mi (1,470.72 km) |
| Backnang to Dobrich | 951.41 mi (1,531.14 km) |
| Backnang to Dospat | 873.40 mi (1,405.61 km) |
| Backnang to Dupnitsa | 804.83 mi (1,295.25 km) |
| Backnang to Elhovo | 949.11 mi (1,527.44 km) |
| Backnang to Etropole | 816.10 mi (1,313.38 km) |
| Backnang to Gabrovo | 869.92 mi (1,400.00 km) |
| Backnang to Gorna Oryahovitsa | 875.14 mi (1,408.40 km) |
| Backnang to Gotse Delchev | 860.19 mi (1,384.33 km) |
| Backnang to Harmanli | 931.02 mi (1,498.33 km) |
| Backnang to Haskovo | 917.37 mi (1,476.36 km) |
| Backnang to Ihtiman | 825.14 mi (1,327.93 km) |
| Backnang to Isperih | 902.79 mi (1,452.91 km) |
| Backnang to Kardzhali | 921.29 mi (1,482.67 km) |
