| Llantwit Major to Sestu | 1,032.29 mi (1,661.32 km) |
| Llantwit Major to Settimo Torinese | 673.35 mi (1,083.64 km) |
| Llantwit Major to Seveso | 699.66 mi (1,125.99 km) |
| Llantwit Major to Sezze | 1,039.01 mi (1,672.13 km) |
| Llantwit Major to Siano | 1,132.21 mi (1,822.12 km) |
| Llantwit Major to Siena | 887.35 mi (1,428.06 km) |
| Llantwit Major to Signa | 856.80 mi (1,378.89 km) |
| Llantwit Major to Silea | 821.41 mi (1,321.93 km) |
| Llantwit Major to Silvi Paese | 1,026.24 mi (1,651.57 km) |
| Llantwit Major to Sinalunga | 906.77 mi (1,459.31 km) |
| Llantwit Major to Siniscola | 976.71 mi (1,571.86 km) |
| Llantwit Major to Sinnai | 1,035.25 mi (1,666.07 km) |
| Llantwit Major to Siracusa | 1,350.10 mi (2,172.78 km) |
| Llantwit Major to Solaro | 698.90 mi (1,124.78 km) |
| Llantwit Major to Soliera | 806.58 mi (1,298.06 km) |
