| Washington to Smolyan | 1,502.28 mi (2,417.68 km) |
| Washington to Sofia | 1,398.01 mi (2,249.89 km) |
| Washington to Sopot | 1,451.28 mi (2,335.61 km) |
| Washington to Sozopol | 1,570.43 mi (2,527.36 km) |
| Washington to Sredets | 1,555.13 mi (2,502.74 km) |
| Washington to Stamboliyski | 1,468.89 mi (2,363.94 km) |
| Washington to Stara Zagora | 1,494.39 mi (2,404.99 km) |
| Washington to Svilengrad | 1,546.89 mi (2,489.49 km) |
| Washington to Svishtov | 1,427.06 mi (2,296.63 km) |
| Washington to Targovishte | 1,489.79 mi (2,397.58 km) |
| Washington to Teteven | 1,420.90 mi (2,286.72 km) |
| Washington to Troyan | 1,438.77 mi (2,315.47 km) |
| Washington to Tryavna | 1,468.03 mi (2,362.57 km) |
| Washington to Tutrakan | 1,454.22 mi (2,340.35 km) |
| Washington to Varna | 1,541.06 mi (2,480.10 km) |
