| Serpa to Karlovo | 1,727.38 mi (2,779.94 km) |
| Serpa to Karnobat | 1,837.98 mi (2,957.94 km) |
| Serpa to Kavarna | 1,904.92 mi (3,065.67 km) |
| Serpa to Kazanlak | 1,757.52 mi (2,828.46 km) |
| Serpa to Knezha | 1,691.89 mi (2,722.83 km) |
| Serpa to Kostinbrod | 1,646.78 mi (2,650.23 km) |
| Serpa to Kozloduy | 1,675.31 mi (2,696.15 km) |
| Serpa to Kyustendil | 1,619.06 mi (2,605.62 km) |
| Serpa to Levski | 1,744.28 mi (2,807.14 km) |
| Serpa to Lom | 1,650.80 mi (2,656.70 km) |
| Serpa to Lovech | 1,723.05 mi (2,772.98 km) |
| Serpa to Lukovit | 1,695.41 mi (2,728.50 km) |
| Serpa to Lyaskovets | 1,773.43 mi (2,854.06 km) |
| Serpa to Mezdra | 1,671.81 mi (2,690.51 km) |
| Serpa to Momchilgrad | 1,760.69 mi (2,833.56 km) |
