| Serpa to Devnya | 1,866.62 mi (3,004.04 km) |
| Serpa to Dimitrovgrad | 1,768.61 mi (2,846.31 km) |
| Serpa to Dobrich | 1,879.76 mi (3,025.18 km) |
| Serpa to Dospat | 1,695.81 mi (2,729.15 km) |
| Serpa to Dupnitsa | 1,641.30 mi (2,641.41 km) |
| Serpa to Elhovo | 1,817.83 mi (2,925.52 km) |
| Serpa to Etropole | 1,686.49 mi (2,714.14 km) |
| Serpa to Gabrovo | 1,754.04 mi (2,822.85 km) |
| Serpa to Gorna Oryahovitsa | 1,772.60 mi (2,852.72 km) |
| Serpa to Gotse Delchev | 1,673.62 mi (2,693.44 km) |
| Serpa to Harmanli | 1,784.31 mi (2,871.57 km) |
| Serpa to Haskovo | 1,767.19 mi (2,844.02 km) |
| Serpa to Ihtiman | 1,676.95 mi (2,698.79 km) |
| Serpa to Isperih | 1,829.79 mi (2,944.76 km) |
| Serpa to Kardzhali | 1,757.72 mi (2,828.77 km) |
