| Serris to Devnya | 1,244.31 mi (2,002.52 km) |
| Serris to Dimitrovgrad | 1,195.71 mi (1,924.30 km) |
| Serris to Dobrich | 1,245.57 mi (2,004.54 km) |
| Serris to Dospat | 1,147.73 mi (1,847.09 km) |
| Serris to Dupnitsa | 1,079.48 mi (1,737.26 km) |
| Serris to Elhovo | 1,234.29 mi (1,986.40 km) |
| Serris to Etropole | 1,097.97 mi (1,767.01 km) |
| Serris to Gabrovo | 1,155.81 mi (1,860.10 km) |
| Serris to Gorna Oryahovitsa | 1,163.39 mi (1,872.30 km) |
| Serris to Gotse Delchev | 1,132.15 mi (1,822.03 km) |
| Serris to Harmanli | 1,213.06 mi (1,952.24 km) |
| Serris to Haskovo | 1,198.41 mi (1,928.66 km) |
| Serris to Ihtiman | 1,103.69 mi (1,776.22 km) |
| Serris to Isperih | 1,196.03 mi (1,924.83 km) |
| Serris to Kardzhali | 1,199.94 mi (1,931.12 km) |
