| Castle Pines to Smolyan | 6,004.66 mi (9,663.57 km) |
| Castle Pines to Sofia | 5,900.80 mi (9,496.42 km) |
| Castle Pines to Sopot | 5,947.01 mi (9,570.79 km) |
| Castle Pines to Sozopol | 6,047.63 mi (9,732.71 km) |
| Castle Pines to Sredets | 6,036.83 mi (9,715.33 km) |
| Castle Pines to Stamboliyski | 5,969.05 mi (9,606.26 km) |
| Castle Pines to Stara Zagora | 5,986.20 mi (9,633.86 km) |
| Castle Pines to Svilengrad | 6,040.05 mi (9,720.52 km) |
| Castle Pines to Svishtov | 5,911.22 mi (9,513.20 km) |
| Castle Pines to Targovishte | 5,968.00 mi (9,604.56 km) |
| Castle Pines to Teteven | 5,917.58 mi (9,523.43 km) |
| Castle Pines to Troyan | 5,933.06 mi (9,548.34 km) |
| Castle Pines to Tryavna | 5,957.50 mi (9,587.66 km) |
| Castle Pines to Tutrakan | 5,923.93 mi (9,533.65 km) |
| Castle Pines to Varna | 6,008.38 mi (9,669.56 km) |
