| Basel to Smolyan | 935.07 mi (1,504.85 km) |
| Basel to Sofia | 835.41 mi (1,344.47 km) |
| Basel to Sopot | 900.44 mi (1,449.12 km) |
| Basel to Sozopol | 1,041.25 mi (1,675.73 km) |
| Basel to Sredets | 1,020.62 mi (1,642.54 km) |
| Basel to Stamboliyski | 908.12 mi (1,461.48 km) |
| Basel to Stara Zagora | 947.92 mi (1,525.53 km) |
| Basel to Svilengrad | 994.94 mi (1,601.20 km) |
| Basel to Svishtov | 898.47 mi (1,445.96 km) |
| Basel to Targovishte | 965.30 mi (1,553.50 km) |
| Basel to Teteven | 870.18 mi (1,400.42 km) |
| Basel to Troyan | 891.49 mi (1,434.71 km) |
| Basel to Tryavna | 927.38 mi (1,492.48 km) |
| Basel to Tutrakan | 945.21 mi (1,521.17 km) |
| Basel to Varna | 1,027.44 mi (1,653.51 km) |
