| Smithville to Smolyan | 5,668.22 mi (9,122.12 km) |
| Smithville to Sofia | 5,563.93 mi (8,954.29 km) |
| Smithville to Sopot | 5,616.00 mi (9,038.09 km) |
| Smithville to Sozopol | 5,728.62 mi (9,219.32 km) |
| Smithville to Sredets | 5,715.23 mi (9,197.77 km) |
| Smithville to Stamboliyski | 5,634.57 mi (9,067.96 km) |
| Smithville to Stara Zagora | 5,658.08 mi (9,105.79 km) |
| Smithville to Svilengrad | 5,711.13 mi (9,191.18 km) |
| Smithville to Svishtov | 5,587.61 mi (8,992.38 km) |
| Smithville to Targovishte | 5,648.00 mi (9,089.58 km) |
| Smithville to Teteven | 5,585.80 mi (8,989.48 km) |
| Smithville to Troyan | 5,603.06 mi (9,017.26 km) |
| Smithville to Tryavna | 5,630.83 mi (9,061.95 km) |
| Smithville to Tutrakan | 5,608.02 mi (9,025.23 km) |
| Smithville to Varna | 5,694.22 mi (9,163.97 km) |
