| Monroe to Smolyan | 5,930.60 mi (9,544.37 km) |
| Monroe to Sofia | 5,827.11 mi (9,377.83 km) |
| Monroe to Sopot | 5,884.20 mi (9,469.71 km) |
| Monroe to Sozopol | 6,006.73 mi (9,666.90 km) |
| Monroe to Sredets | 5,991.11 mi (9,641.75 km) |
| Monroe to Stamboliyski | 5,899.22 mi (9,493.88 km) |
| Monroe to Stara Zagora | 5,928.52 mi (9,541.03 km) |
| Monroe to Svilengrad | 5,980.22 mi (9,624.23 km) |
| Monroe to Svishtov | 5,863.06 mi (9,435.69 km) |
| Monroe to Targovishte | 5,926.12 mi (9,537.17 km) |
| Monroe to Teteven | 5,853.61 mi (9,420.47 km) |
| Monroe to Troyan | 5,872.36 mi (9,450.65 km) |
| Monroe to Tryavna | 5,902.96 mi (9,499.90 km) |
| Monroe to Tutrakan | 5,890.31 mi (9,479.54 km) |
| Monroe to Varna | 5,977.13 mi (9,619.27 km) |
