| Richterswil to Smolyan | 878.30 mi (1,413.49 km) |
| Richterswil to Sofia | 778.83 mi (1,253.41 km) |
| Richterswil to Sopot | 844.13 mi (1,358.50 km) |
| Richterswil to Sozopol | 985.50 mi (1,586.02 km) |
| Richterswil to Sredets | 964.71 mi (1,552.55 km) |
| Richterswil to Stamboliyski | 851.51 mi (1,370.37 km) |
| Richterswil to Stara Zagora | 891.68 mi (1,435.03 km) |
| Richterswil to Svilengrad | 938.47 mi (1,510.33 km) |
| Richterswil to Svishtov | 843.06 mi (1,356.77 km) |
| Richterswil to Targovishte | 909.91 mi (1,464.36 km) |
| Richterswil to Teteven | 813.92 mi (1,309.87 km) |
| Richterswil to Troyan | 835.31 mi (1,344.30 km) |
| Richterswil to Tryavna | 871.39 mi (1,402.36 km) |
| Richterswil to Tutrakan | 890.64 mi (1,433.35 km) |
| Richterswil to Varna | 972.41 mi (1,564.95 km) |
