| Richterswil to Karlovo | 846.91 mi (1,362.98 km) |
| Richterswil to Karnobat | 946.14 mi (1,522.67 km) |
| Richterswil to Kavarna | 985.96 mi (1,586.75 km) |
| Richterswil to Kazanlak | 874.56 mi (1,407.47 km) |
| Richterswil to Knezha | 788.19 mi (1,268.47 km) |
| Richterswil to Kostinbrod | 769.94 mi (1,239.09 km) |
| Richterswil to Kozloduy | 764.27 mi (1,229.97 km) |
| Richterswil to Kyustendil | 764.64 mi (1,230.57 km) |
| Richterswil to Levski | 840.01 mi (1,351.86 km) |
| Richterswil to Lom | 740.42 mi (1,191.59 km) |
| Richterswil to Lovech | 827.72 mi (1,332.09 km) |
| Richterswil to Lukovit | 800.75 mi (1,288.68 km) |
| Richterswil to Lyaskovets | 874.37 mi (1,407.17 km) |
| Richterswil to Mezdra | 781.11 mi (1,257.08 km) |
| Richterswil to Momchilgrad | 911.73 mi (1,467.28 km) |
