| Grenchen to Smolyan | 935.47 mi (1,505.49 km) |
| Grenchen to Sofia | 836.79 mi (1,346.69 km) |
| Grenchen to Sopot | 902.77 mi (1,452.86 km) |
| Grenchen to Sozopol | 1,045.03 mi (1,681.81 km) |
| Grenchen to Sredets | 1,024.01 mi (1,647.98 km) |
| Grenchen to Stamboliyski | 909.35 mi (1,463.46 km) |
| Grenchen to Stara Zagora | 950.46 mi (1,529.62 km) |
| Grenchen to Svilengrad | 996.73 mi (1,604.08 km) |
| Grenchen to Svishtov | 902.97 mi (1,453.20 km) |
| Grenchen to Targovishte | 969.84 mi (1,560.80 km) |
| Grenchen to Teteven | 872.67 mi (1,404.42 km) |
| Grenchen to Troyan | 894.22 mi (1,439.11 km) |
| Grenchen to Tryavna | 930.59 mi (1,497.65 km) |
| Grenchen to Tutrakan | 951.18 mi (1,530.77 km) |
| Grenchen to Varna | 1,032.63 mi (1,661.86 km) |
