| South Portland to San Lorenzo de Descardazar | 3,682.85 mi (5,926.98 km) |
| South Portland to San Lorenzo de El Escorial | 3,305.21 mi (5,319.21 km) |
| South Portland to San Martin de la Vega | 3,344.01 mi (5,381.66 km) |
| South Portland to San Martin de Valdeiglesias | 3,300.24 mi (5,311.23 km) |
| South Portland to San Pedro de Ribas | 3,557.81 mi (5,725.74 km) |
| South Portland to San Roque | 3,389.52 mi (5,454.90 km) |
| South Portland to San Sebastian de la Gomera | 3,106.45 mi (4,999.35 km) |
| South Portland to San Sebastian de los Reyes | 3,330.87 mi (5,360.52 km) |
| South Portland to San Vicente de Baracaldo | 3,277.01 mi (5,273.84 km) |
| South Portland to San Vicente de Castellet | 3,548.69 mi (5,711.06 km) |
| South Portland to San Vicente del Raspeig | 3,546.87 mi (5,708.13 km) |
| South Portland to San Vicente dels Horts | 3,564.22 mi (5,736.06 km) |
| South Portland to Sangenjo | 3,033.70 mi (4,882.26 km) |
| South Portland to Sanlucar de Barrameda | 3,323.89 mi (5,349.28 km) |
| South Portland to Sanlucar la Mayor | 3,310.54 mi (5,327.79 km) |
