| Aberystwyth to Sestu | 1,102.09 mi (1,773.64 km) |
| Aberystwyth to Settimo Torinese | 735.93 mi (1,184.36 km) |
| Aberystwyth to Seveso | 757.93 mi (1,219.77 km) |
| Aberystwyth to Sezze | 1,100.54 mi (1,771.15 km) |
| Aberystwyth to Siano | 1,192.58 mi (1,919.27 km) |
| Aberystwyth to Siena | 947.96 mi (1,525.59 km) |
| Aberystwyth to Signa | 916.70 mi (1,475.29 km) |
| Aberystwyth to Silea | 873.60 mi (1,405.92 km) |
| Aberystwyth to Silvi Paese | 1,084.01 mi (1,744.55 km) |
| Aberystwyth to Sinalunga | 966.93 mi (1,556.12 km) |
| Aberystwyth to Siniscola | 1,044.48 mi (1,680.92 km) |
| Aberystwyth to Sinnai | 1,104.92 mi (1,778.19 km) |
| Aberystwyth to Siracusa | 1,414.89 mi (2,277.04 km) |
| Aberystwyth to Solaro | 757.38 mi (1,218.88 km) |
| Aberystwyth to Soliera | 864.22 mi (1,390.84 km) |
