| San Francisco to Smolyan | 6,576.76 mi (10,584.28 km) |
| San Francisco to Sofia | 6,476.66 mi (10,423.17 km) |
| San Francisco to Sopot | 6,511.33 mi (10,478.97 km) |
| San Francisco to Sozopol | 6,587.97 mi (10,602.31 km) |
| San Francisco to Sredets | 6,582.03 mi (10,592.76 km) |
| San Francisco to Stamboliyski | 6,538.78 mi (10,523.15 km) |
| San Francisco to Stara Zagora | 6,544.33 mi (10,532.08 km) |
| San Francisco to Svilengrad | 6,597.95 mi (10,618.37 km) |
| San Francisco to Svishtov | 6,463.78 mi (10,402.45 km) |
| San Francisco to Targovishte | 6,512.52 mi (10,480.88 km) |
| San Francisco to Teteven | 6,484.12 mi (10,435.18 km) |
| San Francisco to Troyan | 6,496.05 mi (10,454.38 km) |
| San Francisco to Tryavna | 6,513.94 mi (10,483.18 km) |
| San Francisco to Tutrakan | 6,462.72 mi (10,400.75 km) |
| San Francisco to Varna | 6,541.48 mi (10,527.50 km) |
