| Glen Ellyn to Smolyan | 5,310.10 mi (8,545.78 km) |
| Glen Ellyn to Sofia | 5,205.94 mi (8,378.15 km) |
| Glen Ellyn to Sopot | 5,259.72 mi (8,464.70 km) |
| Glen Ellyn to Sozopol | 5,375.92 mi (8,651.71 km) |
| Glen Ellyn to Sredets | 5,361.71 mi (8,628.85 km) |
| Glen Ellyn to Stamboliyski | 5,277.14 mi (8,492.73 km) |
| Glen Ellyn to Stara Zagora | 5,302.60 mi (8,533.71 km) |
| Glen Ellyn to Svilengrad | 5,355.27 mi (8,618.47 km) |
| Glen Ellyn to Svishtov | 5,233.78 mi (8,422.96 km) |
| Glen Ellyn to Targovishte | 5,295.21 mi (8,521.81 km) |
| Glen Ellyn to Teteven | 5,229.35 mi (8,415.82 km) |
| Glen Ellyn to Troyan | 5,247.13 mi (8,444.44 km) |
| Glen Ellyn to Tryavna | 5,275.90 mi (8,490.74 km) |
| Glen Ellyn to Tutrakan | 5,256.70 mi (8,459.85 km) |
| Glen Ellyn to Varna | 5,343.25 mi (8,599.13 km) |
