| Elk River to Smolyan | 5,328.15 mi (8,574.83 km) |
| Elk River to Sofia | 5,223.94 mi (8,407.12 km) |
| Elk River to Sopot | 5,272.91 mi (8,485.92 km) |
| Elk River to Sozopol | 5,379.48 mi (8,657.44 km) |
| Elk River to Sredets | 5,367.38 mi (8,637.96 km) |
| Elk River to Stamboliyski | 5,293.37 mi (8,518.86 km) |
| Elk River to Stara Zagora | 5,313.51 mi (8,551.27 km) |
| Elk River to Svilengrad | 5,367.07 mi (8,637.46 km) |
| Elk River to Svishtov | 5,240.59 mi (8,433.91 km) |
| Elk River to Targovishte | 5,299.23 mi (8,528.29 km) |
| Elk River to Teteven | 5,243.07 mi (8,437.91 km) |
| Elk River to Troyan | 5,259.41 mi (8,464.20 km) |
| Elk River to Tryavna | 5,285.46 mi (8,506.13 km) |
| Elk River to Tutrakan | 5,257.14 mi (8,460.55 km) |
| Elk River to Varna | 5,342.63 mi (8,598.12 km) |
