| Key Largo to Smolyan | 5,801.08 mi (9,335.94 km) |
| Key Largo to Sofia | 5,702.90 mi (9,177.92 km) |
| Key Largo to Sopot | 5,768.23 mi (9,283.07 km) |
| Key Largo to Sozopol | 5,907.03 mi (9,506.44 km) |
| Key Largo to Sredets | 5,887.28 mi (9,474.66 km) |
| Key Largo to Stamboliyski | 5,775.46 mi (9,294.71 km) |
| Key Largo to Stara Zagora | 5,815.61 mi (9,359.31 km) |
| Key Largo to Svilengrad | 5,862.69 mi (9,435.09 km) |
| Key Largo to Svishtov | 5,762.88 mi (9,274.46 km) |
| Key Largo to Targovishte | 5,829.27 mi (9,381.30 km) |
| Key Largo to Teteven | 5,737.92 mi (9,234.29 km) |
| Key Largo to Troyan | 5,759.08 mi (9,268.34 km) |
| Key Largo to Tryavna | 5,794.44 mi (9,325.25 km) |
| Key Largo to Tutrakan | 5,803.49 mi (9,339.82 km) |
| Key Largo to Varna | 5,888.56 mi (9,476.72 km) |
