| Pen-y-Bont ar Ogwr to Sestu | 1,040.48 mi (1,674.50 km) |
| Pen-y-Bont ar Ogwr to Settimo Torinese | 681.04 mi (1,096.02 km) |
| Pen-y-Bont ar Ogwr to Seveso | 706.99 mi (1,137.80 km) |
| Pen-y-Bont ar Ogwr to Sezze | 1,046.65 mi (1,684.42 km) |
| Pen-y-Bont ar Ogwr to Siano | 1,139.76 mi (1,834.27 km) |
| Pen-y-Bont ar Ogwr to Siena | 894.91 mi (1,440.21 km) |
| Pen-y-Bont ar Ogwr to Signa | 864.30 mi (1,390.95 km) |
| Pen-y-Bont ar Ogwr to Silea | 828.22 mi (1,332.89 km) |
| Pen-y-Bont ar Ogwr to Silvi Paese | 1,033.57 mi (1,663.36 km) |
| Pen-y-Bont ar Ogwr to Sinalunga | 914.29 mi (1,471.40 km) |
| Pen-y-Bont ar Ogwr to Siniscola | 984.79 mi (1,584.87 km) |
| Pen-y-Bont ar Ogwr to Sinnai | 1,043.43 mi (1,679.24 km) |
| Pen-y-Bont ar Ogwr to Siracusa | 1,357.99 mi (2,185.48 km) |
| Pen-y-Bont ar Ogwr to Solaro | 706.26 mi (1,136.61 km) |
| Pen-y-Bont ar Ogwr to Soliera | 813.87 mi (1,309.81 km) |
