| Kilchberg to Smolyan | 887.54 mi (1,428.36 km) |
| Kilchberg to Sofia | 787.89 mi (1,267.99 km) |
| Kilchberg to Sopot | 853.00 mi (1,372.77 km) |
| Kilchberg to Sozopol | 994.05 mi (1,599.77 km) |
| Kilchberg to Sredets | 973.35 mi (1,566.45 km) |
| Kilchberg to Stamboliyski | 860.60 mi (1,385.00 km) |
| Kilchberg to Stara Zagora | 900.50 mi (1,449.22 km) |
| Kilchberg to Svilengrad | 947.45 mi (1,524.77 km) |
| Kilchberg to Svishtov | 851.44 mi (1,370.26 km) |
| Kilchberg to Targovishte | 918.29 mi (1,477.84 km) |
| Kilchberg to Teteven | 822.75 mi (1,324.10 km) |
| Kilchberg to Troyan | 844.09 mi (1,358.44 km) |
| Kilchberg to Tryavna | 880.07 mi (1,416.33 km) |
| Kilchberg to Tutrakan | 898.66 mi (1,446.25 km) |
| Kilchberg to Varna | 980.63 mi (1,578.16 km) |
