| Duncan to Sesimbra | 4,735.92 mi (7,621.72 km) |
| Duncan to Setubal | 4,743.22 mi (7,633.48 km) |
| Duncan to Sever do Vouga | 4,697.37 mi (7,559.69 km) |
| Duncan to Silves | 4,808.67 mi (7,738.80 km) |
| Duncan to Sines | 4,763.02 mi (7,665.33 km) |
| Duncan to Sintra | 4,710.72 mi (7,581.17 km) |
| Duncan to Sobrado de Paiva | 4,692.51 mi (7,551.86 km) |
| Duncan to Sobral de Monte Agraco | 4,715.00 mi (7,588.06 km) |
| Duncan to Soure | 4,706.62 mi (7,574.57 km) |
| Duncan to Tabua | 4,724.98 mi (7,604.12 km) |
| Duncan to Tavira | 4,849.10 mi (7,803.88 km) |
| Duncan to Tomar | 4,731.19 mi (7,614.12 km) |
| Duncan to Tondela | 4,717.45 mi (7,592.01 km) |
| Duncan to Torre de Moncorvo | 4,739.50 mi (7,627.50 km) |
| Duncan to Torres Novas | 4,729.97 mi (7,612.15 km) |
