| Houston to Arcos de Valdevez | 4,736.78 mi (7,623.11 km) |
| Houston to Arcozelo | 4,746.15 mi (7,638.20 km) |
| Houston to Arganil | 4,796.19 mi (7,718.73 km) |
| Houston to Arouca | 4,768.38 mi (7,673.97 km) |
| Houston to Arruda dos Vinhos | 4,778.37 mi (7,690.04 km) |
| Houston to Aveiro | 4,756.40 mi (7,654.68 km) |
| Houston to Aver-o-Mar | 4,731.09 mi (7,613.95 km) |
| Houston to Aves | 4,752.78 mi (7,648.87 km) |
| Houston to Azambuja | 4,786.14 mi (7,702.55 km) |
| Houston to Baiao | 4,772.63 mi (7,680.81 km) |
| Houston to Barcelos | 4,735.59 mi (7,621.19 km) |
| Houston to Barreiro | 4,786.60 mi (7,703.30 km) |
| Houston to Batalha | 4,774.31 mi (7,683.51 km) |
| Houston to Beja | 4,862.62 mi (7,825.63 km) |
| Houston to Belas | 4,773.54 mi (7,682.28 km) |
