| South Houston to Arcos de Valdevez | 4,734.29 mi (7,619.10 km) |
| South Houston to Arcozelo | 4,743.48 mi (7,633.89 km) |
| South Houston to Arganil | 4,793.37 mi (7,714.19 km) |
| South Houston to Arouca | 4,765.71 mi (7,669.66 km) |
| South Houston to Arruda dos Vinhos | 4,775.21 mi (7,684.96 km) |
| South Houston to Aveiro | 4,753.63 mi (7,650.22 km) |
| South Houston to Aver-o-Mar | 4,728.48 mi (7,609.75 km) |
| South Houston to Aves | 4,750.21 mi (7,644.73 km) |
| South Houston to Azambuja | 4,783.02 mi (7,697.52 km) |
| South Houston to Baiao | 4,770.02 mi (7,676.61 km) |
| South Houston to Barcelos | 4,733.02 mi (7,617.05 km) |
| South Houston to Barreiro | 4,783.38 mi (7,698.10 km) |
| South Houston to Batalha | 4,771.32 mi (7,678.69 km) |
| South Houston to Beja | 4,859.34 mi (7,820.35 km) |
| South Houston to Belas | 4,770.33 mi (7,677.10 km) |
