| Idrija to Siran | 1,322.06 mi (2,127.65 km) |
| Idrija to Sirnak | 1,567.67 mi (2,522.92 km) |
| Idrija to Sirvan | 1,528.32 mi (2,459.60 km) |
| Idrija to Sivas | 1,236.24 mi (1,989.53 km) |
| Idrija to Sivasli | 951.93 mi (1,531.98 km) |
| Idrija to Siverek | 1,412.61 mi (2,273.38 km) |
| Idrija to Sivrice | 1,387.56 mi (2,233.06 km) |
| Idrija to Sivrihisar | 994.46 mi (1,600.43 km) |
| Idrija to Sogut | 912.57 mi (1,468.64 km) |
| Idrija to Sogutlu | 895.38 mi (1,440.97 km) |
| Idrija to Soke | 891.80 mi (1,435.22 km) |
| Idrija to Solhan | 1,451.88 mi (2,336.58 km) |
| Idrija to Soma | 834.17 mi (1,342.47 km) |
| Idrija to Sorgun | 1,148.79 mi (1,848.81 km) |
| Idrija to Suhut | 986.94 mi (1,588.33 km) |
