| Grayslake to Smolyan | 5,285.95 mi (8,506.91 km) |
| Grayslake to Sofia | 5,181.76 mi (8,339.24 km) |
| Grayslake to Sopot | 5,235.26 mi (8,425.34 km) |
| Grayslake to Sozopol | 5,350.92 mi (8,611.48 km) |
| Grayslake to Sredets | 5,336.83 mi (8,588.80 km) |
| Grayslake to Stamboliyski | 5,252.87 mi (8,453.67 km) |
| Grayslake to Stara Zagora | 5,278.02 mi (8,494.15 km) |
| Grayslake to Svilengrad | 5,330.75 mi (8,579.01 km) |
| Grayslake to Svishtov | 5,208.94 mi (8,382.98 km) |
| Grayslake to Targovishte | 5,270.21 mi (8,481.59 km) |
| Grayslake to Teteven | 5,204.91 mi (8,376.50 km) |
| Grayslake to Troyan | 5,222.62 mi (8,404.99 km) |
| Grayslake to Tryavna | 5,251.23 mi (8,451.04 km) |
| Grayslake to Tutrakan | 5,231.49 mi (8,419.27 km) |
| Grayslake to Varna | 5,318.00 mi (8,558.49 km) |
