| Alexandroupoli to Siran | 697.29 mi (1,122.18 km) |
| Alexandroupoli to Sirnak | 916.33 mi (1,474.70 km) |
| Alexandroupoli to Sirvan | 881.99 mi (1,419.43 km) |
| Alexandroupoli to Sivas | 592.03 mi (952.79 km) |
| Alexandroupoli to Sivasli | 260.62 mi (419.42 km) |
| Alexandroupoli to Siverek | 749.46 mi (1,206.14 km) |
| Alexandroupoli to Sivrice | 733.49 mi (1,180.43 km) |
| Alexandroupoli to Sivrihisar | 314.67 mi (506.40 km) |
| Alexandroupoli to Sogut | 234.04 mi (376.65 km) |
| Alexandroupoli to Sogutlu | 241.19 mi (388.15 km) |
| Alexandroupoli to Soke | 229.48 mi (369.31 km) |
| Alexandroupoli to Solhan | 814.25 mi (1,310.41 km) |
| Alexandroupoli to Soma | 147.23 mi (236.95 km) |
| Alexandroupoli to Sorgun | 496.02 mi (798.26 km) |
| Alexandroupoli to Suhut | 295.84 mi (476.11 km) |
