| Sierre to Devnya | 1,002.80 mi (1,613.86 km) |
| Sierre to Dimitrovgrad | 939.75 mi (1,512.38 km) |
| Sierre to Dobrich | 1,007.81 mi (1,621.91 km) |
| Sierre to Dospat | 885.15 mi (1,424.52 km) |
| Sierre to Dupnitsa | 818.10 mi (1,316.61 km) |
| Sierre to Elhovo | 981.81 mi (1,580.07 km) |
| Sierre to Etropole | 843.43 mi (1,357.37 km) |
| Sierre to Gabrovo | 905.32 mi (1,456.97 km) |
| Sierre to Gorna Oryahovitsa | 916.14 mi (1,474.39 km) |
| Sierre to Gotse Delchev | 867.88 mi (1,396.72 km) |
| Sierre to Harmanli | 957.11 mi (1,540.32 km) |
| Sierre to Haskovo | 941.55 mi (1,515.27 km) |
| Sierre to Ihtiman | 845.55 mi (1,360.79 km) |
| Sierre to Isperih | 957.02 mi (1,540.18 km) |
| Sierre to Kardzhali | 940.63 mi (1,513.80 km) |
