| River Forest to Smolyan | 5,299.83 mi (8,529.26 km) |
| River Forest to Sofia | 5,195.69 mi (8,361.65 km) |
| River Forest to Sopot | 5,249.56 mi (8,448.35 km) |
| River Forest to Sozopol | 5,365.95 mi (8,635.67 km) |
| River Forest to Sredets | 5,351.70 mi (8,612.73 km) |
| River Forest to Stamboliyski | 5,266.91 mi (8,476.28 km) |
| River Forest to Stara Zagora | 5,292.48 mi (8,517.43 km) |
| River Forest to Svilengrad | 5,345.12 mi (8,602.15 km) |
| River Forest to Svishtov | 5,223.76 mi (8,406.83 km) |
| River Forest to Targovishte | 5,285.24 mi (8,505.77 km) |
| River Forest to Teteven | 5,219.18 mi (8,399.46 km) |
| River Forest to Troyan | 5,236.99 mi (8,428.12 km) |
| River Forest to Tryavna | 5,265.82 mi (8,474.51 km) |
| River Forest to Tutrakan | 5,246.81 mi (8,443.93 km) |
| River Forest to Varna | 5,333.37 mi (8,583.23 km) |
