| San Marino to Smolyan | 6,698.57 mi (10,780.31 km) |
| San Marino to Sofia | 6,596.38 mi (10,615.85 km) |
| San Marino to Sopot | 6,636.17 mi (10,679.89 km) |
| San Marino to Sozopol | 6,723.24 mi (10,820.00 km) |
| San Marino to Sredets | 6,715.26 mi (10,807.16 km) |
| San Marino to Stamboliyski | 6,661.43 mi (10,720.54 km) |
| San Marino to Stara Zagora | 6,671.96 mi (10,737.48 km) |
| San Marino to Svilengrad | 6,725.92 mi (10,824.33 km) |
| San Marino to Svishtov | 6,593.37 mi (10,611.01 km) |
| San Marino to Targovishte | 6,645.69 mi (10,695.21 km) |
| San Marino to Teteven | 6,607.89 mi (10,634.37 km) |
| San Marino to Troyan | 6,621.39 mi (10,656.10 km) |
| San Marino to Tryavna | 6,642.14 mi (10,689.49 km) |
| San Marino to Tutrakan | 6,598.03 mi (10,618.50 km) |
| San Marino to Varna | 6,679.50 mi (10,749.62 km) |
