| San Mateo to Smolyan | 6,586.64 mi (10,600.17 km) |
| San Mateo to Sofia | 6,486.44 mi (10,438.92 km) |
| San Mateo to Sopot | 6,521.31 mi (10,495.04 km) |
| San Mateo to Sozopol | 6,598.35 mi (10,619.02 km) |
| San Mateo to Sredets | 6,592.34 mi (10,609.34 km) |
| San Mateo to Stamboliyski | 6,548.68 mi (10,539.09 km) |
| San Mateo to Stara Zagora | 6,554.42 mi (10,548.32 km) |
| San Mateo to Svilengrad | 6,608.06 mi (10,634.64 km) |
| San Mateo to Svishtov | 6,473.94 mi (10,418.79 km) |
| San Mateo to Targovishte | 6,522.81 mi (10,497.45 km) |
| San Mateo to Teteven | 6,494.06 mi (10,451.18 km) |
| San Mateo to Troyan | 6,506.05 mi (10,470.47 km) |
| San Mateo to Tryavna | 6,524.05 mi (10,499.45 km) |
| San Mateo to Tutrakan | 6,473.09 mi (10,417.43 km) |
| San Mateo to Varna | 6,551.96 mi (10,544.36 km) |
