| Wilmette to Smolyan | 5,287.65 mi (8,509.65 km) |
| Wilmette to Sofia | 5,183.50 mi (8,342.03 km) |
| Wilmette to Sopot | 5,237.30 mi (8,428.62 km) |
| Wilmette to Sozopol | 5,353.56 mi (8,615.72 km) |
| Wilmette to Sredets | 5,339.34 mi (8,592.83 km) |
| Wilmette to Stamboliyski | 5,254.70 mi (8,456.62 km) |
| Wilmette to Stara Zagora | 5,280.19 mi (8,497.65 km) |
| Wilmette to Svilengrad | 5,332.85 mi (8,582.39 km) |
| Wilmette to Svishtov | 5,211.40 mi (8,386.94 km) |
| Wilmette to Targovishte | 5,272.85 mi (8,485.82 km) |
| Wilmette to Teteven | 5,206.93 mi (8,379.74 km) |
| Wilmette to Troyan | 5,224.72 mi (8,408.37 km) |
| Wilmette to Tryavna | 5,253.50 mi (8,454.70 km) |
| Wilmette to Tutrakan | 5,234.37 mi (8,423.90 km) |
| Wilmette to Varna | 5,320.92 mi (8,563.19 km) |
