| Niagara Falls to Arcos de Valdevez | 3,487.03 mi (5,611.84 km) |
| Niagara Falls to Arcozelo | 3,501.66 mi (5,635.38 km) |
| Niagara Falls to Arganil | 3,555.71 mi (5,722.36 km) |
| Niagara Falls to Arouca | 3,523.81 mi (5,671.02 km) |
| Niagara Falls to Arruda dos Vinhos | 3,548.70 mi (5,711.08 km) |
| Niagara Falls to Aveiro | 3,514.60 mi (5,656.20 km) |
| Niagara Falls to Aver-o-Mar | 3,484.71 mi (5,608.10 km) |
| Niagara Falls to Aves | 3,505.23 mi (5,641.12 km) |
| Niagara Falls to Azambuja | 3,555.37 mi (5,721.82 km) |
| Niagara Falls to Baiao | 3,526.18 mi (5,674.84 km) |
| Niagara Falls to Barcelos | 3,488.22 mi (5,613.74 km) |
| Niagara Falls to Barreiro | 3,559.20 mi (5,727.98 km) |
| Niagara Falls to Batalha | 3,539.35 mi (5,696.03 km) |
| Niagara Falls to Beja | 3,636.52 mi (5,852.42 km) |
| Niagara Falls to Belas | 3,545.90 mi (5,706.58 km) |
