| Smolyan to Somma Lombardo | 847.02 mi (1,363.15 km) |
| Smolyan to Somma Vesuviana | 535.25 mi (861.41 km) |
| Smolyan to Sommacampagna | 741.44 mi (1,193.23 km) |
| Smolyan to Sona | 742.85 mi (1,195.51 km) |
| Smolyan to Sondrio | 802.12 mi (1,290.88 km) |
| Smolyan to Sora | 571.89 mi (920.36 km) |
| Smolyan to Sorbolo | 751.04 mi (1,208.68 km) |
| Smolyan to Soresina | 786.05 mi (1,265.03 km) |
| Smolyan to Sorisole | 803.34 mi (1,292.84 km) |
| Smolyan to Sorrento | 541.32 mi (871.16 km) |
| Smolyan to Sorso | 838.82 mi (1,349.95 km) |
| Smolyan to Sortino | 599.19 mi (964.30 km) |
| Smolyan to Soverato Marina | 474.60 mi (763.80 km) |
| Smolyan to Sovicille | 695.91 mi (1,119.96 km) |
| Smolyan to Spello | 621.86 mi (1,000.79 km) |
