| Sunnyvale to Smolyan | 6,590.81 mi (10,606.88 km) |
| Sunnyvale to Sofia | 6,490.47 mi (10,445.40 km) |
| Sunnyvale to Sopot | 6,525.65 mi (10,502.01 km) |
| Sunnyvale to Sozopol | 6,603.31 mi (10,627.00 km) |
| Sunnyvale to Sredets | 6,597.18 mi (10,617.13 km) |
| Sunnyvale to Stamboliyski | 6,552.90 mi (10,545.87 km) |
| Sunnyvale to Stara Zagora | 6,558.93 mi (10,555.57 km) |
| Sunnyvale to Svilengrad | 6,612.59 mi (10,641.94 km) |
| Sunnyvale to Svishtov | 6,478.54 mi (10,426.20 km) |
| Sunnyvale to Targovishte | 6,527.63 mi (10,505.21 km) |
| Sunnyvale to Teteven | 6,498.33 mi (10,458.04 km) |
| Sunnyvale to Troyan | 6,510.41 mi (10,477.49 km) |
| Sunnyvale to Tryavna | 6,528.58 mi (10,506.74 km) |
| Sunnyvale to Tutrakan | 6,478.03 mi (10,425.38 km) |
| Sunnyvale to Varna | 6,557.08 mi (10,552.59 km) |
