| Riga to Sestu | 1,395.37 mi (2,245.63 km) |
| Riga to Settimo Torinese | 1,076.24 mi (1,732.05 km) |
| Riga to Seveso | 1,009.58 mi (1,624.76 km) |
| Riga to Sezze | 1,174.52 mi (1,890.21 km) |
| Riga to Siano | 1,192.17 mi (1,918.61 km) |
| Riga to Siena | 1,094.65 mi (1,761.67 km) |
| Riga to Signa | 1,071.19 mi (1,723.91 km) |
| Riga to Silea | 929.44 mi (1,495.79 km) |
| Riga to Silvi Paese | 1,087.62 mi (1,750.35 km) |
| Riga to Sinalunga | 1,092.17 mi (1,757.67 km) |
| Riga to Siniscola | 1,301.94 mi (2,095.26 km) |
| Riga to Sinnai | 1,392.74 mi (2,241.40 km) |
| Riga to Siracusa | 1,432.25 mi (2,304.98 km) |
| Riga to Solaro | 1,012.65 mi (1,629.71 km) |
| Riga to Soliera | 1,017.22 mi (1,637.06 km) |
