| Llantwit Major to Sesena | 781.01 mi (1,256.91 km) |
| Llantwit Major to Sestao | 559.77 mi (900.86 km) |
| Llantwit Major to Sevilla | 986.50 mi (1,587.61 km) |
| Llantwit Major to Sevilla La Nueva | 764.54 mi (1,230.41 km) |
| Llantwit Major to Silla | 845.17 mi (1,360.18 km) |
| Llantwit Major to Silleda | 641.54 mi (1,032.46 km) |
| Llantwit Major to Sitges | 746.12 mi (1,200.77 km) |
| Llantwit Major to Socuellamos | 837.56 mi (1,347.93 km) |
| Llantwit Major to Soller | 857.09 mi (1,379.35 km) |
| Llantwit Major to Solsona | 691.58 mi (1,112.99 km) |
| Llantwit Major to Son Servera | 878.02 mi (1,413.04 km) |
| Llantwit Major to Sonseca | 809.14 mi (1,302.19 km) |
| Llantwit Major to Sopelana | 554.94 mi (893.09 km) |
| Llantwit Major to Soria | 667.73 mi (1,074.60 km) |
| Llantwit Major to Suances | 551.52 mi (887.59 km) |
