| Western Springs to Smolyan | 5,307.31 mi (8,541.29 km) |
| Western Springs to Sofia | 5,203.17 mi (8,373.69 km) |
| Western Springs to Sopot | 5,257.06 mi (8,460.42 km) |
| Western Springs to Sozopol | 5,373.49 mi (8,647.79 km) |
| Western Springs to Sredets | 5,359.23 mi (8,624.85 km) |
| Western Springs to Stamboliyski | 5,274.40 mi (8,488.33 km) |
| Western Springs to Stara Zagora | 5,299.99 mi (8,529.51 km) |
| Western Springs to Svilengrad | 5,352.63 mi (8,614.22 km) |
| Western Springs to Svishtov | 5,231.29 mi (8,418.94 km) |
| Western Springs to Targovishte | 5,292.77 mi (8,517.89 km) |
| Western Springs to Teteven | 5,226.68 mi (8,411.53 km) |
| Western Springs to Troyan | 5,244.50 mi (8,440.20 km) |
| Western Springs to Tryavna | 5,273.33 mi (8,486.61 km) |
| Western Springs to Tutrakan | 5,254.36 mi (8,456.08 km) |
| Western Springs to Varna | 5,340.92 mi (8,595.39 km) |
