| Coolidge to Smolyan | 6,584.83 mi (10,597.26 km) |
| Coolidge to Sofia | 6,481.13 mi (10,430.37 km) |
| Coolidge to Sopot | 6,526.41 mi (10,503.25 km) |
| Coolidge to Sozopol | 6,624.79 mi (10,661.57 km) |
| Coolidge to Sredets | 6,614.50 mi (10,645.00 km) |
| Coolidge to Stamboliyski | 6,548.97 mi (10,539.55 km) |
| Coolidge to Stara Zagora | 6,565.09 mi (10,565.49 km) |
| Coolidge to Svilengrad | 6,619.00 mi (10,652.26 km) |
| Coolidge to Svishtov | 6,489.43 mi (10,443.73 km) |
| Coolidge to Targovishte | 6,545.46 mi (10,533.90 km) |
| Coolidge to Teteven | 6,497.14 mi (10,456.14 km) |
| Coolidge to Troyan | 6,512.32 mi (10,480.57 km) |
| Coolidge to Tryavna | 6,536.17 mi (10,518.95 km) |
| Coolidge to Tutrakan | 6,500.68 mi (10,461.83 km) |
| Coolidge to Varna | 6,584.64 mi (10,596.96 km) |
