| Castelo Branco to Siran | 2,438.74 mi (3,924.77 km) |
| Castelo Branco to Sirnak | 2,664.51 mi (4,288.11 km) |
| Castelo Branco to Sirvan | 2,630.01 mi (4,232.59 km) |
| Castelo Branco to Sivas | 2,338.51 mi (3,763.47 km) |
| Castelo Branco to Sivasli | 1,980.08 mi (3,186.64 km) |
| Castelo Branco to Siverek | 2,496.63 mi (4,017.94 km) |
| Castelo Branco to Sivrice | 2,481.68 mi (3,993.87 km) |
| Castelo Branco to Sivrihisar | 2,060.64 mi (3,316.29 km) |
| Castelo Branco to Sogut | 1,981.70 mi (3,189.24 km) |
| Castelo Branco to Sogutlu | 1,985.41 mi (3,195.21 km) |
| Castelo Branco to Soke | 1,873.74 mi (3,015.49 km) |
| Castelo Branco to Solhan | 2,560.69 mi (4,121.03 km) |
| Castelo Branco to Soma | 1,860.11 mi (2,993.57 km) |
| Castelo Branco to Sorgun | 2,243.48 mi (3,610.54 km) |
| Castelo Branco to Suhut | 2,024.37 mi (3,257.91 km) |
