| Kelso to Smolyan | 6,057.08 mi (9,747.92 km) |
| Kelso to Sofia | 5,959.08 mi (9,590.21 km) |
| Kelso to Sopot | 5,989.61 mi (9,639.34 km) |
| Kelso to Sozopol | 6,058.16 mi (9,749.67 km) |
| Kelso to Sredets | 6,053.73 mi (9,742.54 km) |
| Kelso to Stamboliyski | 6,018.62 mi (9,686.03 km) |
| Kelso to Stara Zagora | 6,020.35 mi (9,688.81 km) |
| Kelso to Svilengrad | 6,073.46 mi (9,774.29 km) |
| Kelso to Svishtov | 5,938.67 mi (9,557.37 km) |
| Kelso to Targovishte | 5,984.55 mi (9,631.20 km) |
| Kelso to Teteven | 5,963.35 mi (9,597.08 km) |
| Kelso to Troyan | 5,974.02 mi (9,614.25 km) |
| Kelso to Tryavna | 5,989.66 mi (9,639.43 km) |
| Kelso to Tutrakan | 5,933.41 mi (9,548.90 km) |
| Kelso to Varna | 6,009.90 mi (9,672.00 km) |
