| Niagara Falls to Alenquer | 3,548.85 mi (5,711.33 km) |
| Niagara Falls to Alfena | 3,501.18 mi (5,634.61 km) |
| Niagara Falls to Alijo | 3,548.44 mi (5,710.66 km) |
| Niagara Falls to Aljustrel | 3,627.08 mi (5,837.22 km) |
| Niagara Falls to Almada | 3,554.41 mi (5,720.28 km) |
| Niagara Falls to Almargem | 3,543.53 mi (5,702.75 km) |
| Niagara Falls to Almeirim | 3,562.73 mi (5,733.67 km) |
| Niagara Falls to Amadora | 3,549.11 mi (5,711.74 km) |
| Niagara Falls to Amarante | 3,521.46 mi (5,667.25 km) |
| Niagara Falls to Amares | 3,498.15 mi (5,629.73 km) |
| Niagara Falls to Amora | 3,558.07 mi (5,726.16 km) |
| Niagara Falls to Anadia | 3,531.09 mi (5,682.74 km) |
| Niagara Falls to Angra do Heroismo | 2,680.43 mi (4,313.73 km) |
| Niagara Falls to Ansiao | 3,547.82 mi (5,709.66 km) |
| Niagara Falls to Anta | 3,503.86 mi (5,638.92 km) |
