| Port Glasgow to San Lorenzo de Descardazar | 1,185.32 mi (1,907.59 km) |
| Port Glasgow to San Lorenzo de El Escorial | 1,060.21 mi (1,706.24 km) |
| Port Glasgow to San Martin de la Vega | 1,087.65 mi (1,750.41 km) |
| Port Glasgow to San Martin de Valdeiglesias | 1,075.86 mi (1,731.43 km) |
| Port Glasgow to San Pedro de Ribas | 1,054.95 mi (1,697.77 km) |
| Port Glasgow to San Roque | 1,363.21 mi (2,193.87 km) |
| Port Glasgow to San Sebastian de la Gomera | 2,019.51 mi (3,250.09 km) |
| Port Glasgow to San Sebastian de los Reyes | 1,064.24 mi (1,712.73 km) |
| Port Glasgow to San Vicente de Baracaldo | 876.36 mi (1,410.36 km) |
| Port Glasgow to San Vicente de Castellet | 1,028.87 mi (1,655.81 km) |
| Port Glasgow to San Vicente del Raspeig | 1,226.87 mi (1,974.46 km) |
| Port Glasgow to San Vicente dels Horts | 1,048.97 mi (1,688.16 km) |
| Port Glasgow to Sangenjo | 952.87 mi (1,533.50 km) |
| Port Glasgow to Sanlucar de Barrameda | 1,326.60 mi (2,134.96 km) |
| Port Glasgow to Sanlucar la Mayor | 1,283.66 mi (2,065.86 km) |
