| South Portland to Santa Ursula | 3,124.24 mi (5,027.97 km) |
| South Portland to Santander | 3,235.13 mi (5,206.43 km) |
| South Portland to Santany | 3,684.43 mi (5,929.51 km) |
| South Portland to Santiago de Compostela | 3,032.92 mi (4,881.01 km) |
| South Portland to Santiago del Teide | 3,113.19 mi (5,010.20 km) |
| South Portland to Santiponce | 3,316.35 mi (5,337.15 km) |
| South Portland to Santomera | 3,533.57 mi (5,686.73 km) |
| South Portland to Santona | 3,251.59 mi (5,232.94 km) |
| South Portland to Santurce-Antiguo | 3,274.24 mi (5,269.38 km) |
| South Portland to Sarria | 3,087.95 mi (4,969.58 km) |
| South Portland to Sauzal | 3,124.89 mi (5,029.03 km) |
| South Portland to Sedavi | 3,518.68 mi (5,662.77 km) |
| South Portland to Segorbe | 3,499.69 mi (5,632.21 km) |
| South Portland to Segovia | 3,295.38 mi (5,303.41 km) |
| South Portland to Senmanat | 3,562.91 mi (5,733.95 km) |
