| Dumbarton to Sesimbra | 1,227.49 mi (1,975.46 km) |
| Dumbarton to Setubal | 1,220.39 mi (1,964.02 km) |
| Dumbarton to Sever do Vouga | 1,065.35 mi (1,714.52 km) |
| Dumbarton to Silves | 1,308.88 mi (2,106.44 km) |
| Dumbarton to Sines | 1,259.17 mi (2,026.43 km) |
| Dumbarton to Sintra | 1,205.56 mi (1,940.17 km) |
| Dumbarton to Sobrado de Paiva | 1,044.10 mi (1,680.31 km) |
| Dumbarton to Sobral de Monte Agraco | 1,188.67 mi (1,912.98 km) |
| Dumbarton to Soure | 1,114.07 mi (1,792.92 km) |
| Dumbarton to Tabua | 1,088.56 mi (1,751.86 km) |
| Dumbarton to Tavira | 1,309.16 mi (2,106.89 km) |
| Dumbarton to Tomar | 1,143.29 mi (1,839.94 km) |
| Dumbarton to Tondela | 1,078.20 mi (1,735.19 km) |
| Dumbarton to Torre de Moncorvo | 1,025.68 mi (1,650.67 km) |
| Dumbarton to Torres Novas | 1,153.24 mi (1,855.97 km) |
