| Niagara Falls to Argentona | 3,984.89 mi (6,413.06 km) |
| Niagara Falls to Arico el Nuevo | 3,572.21 mi (5,748.92 km) |
| Niagara Falls to Armilla | 3,868.67 mi (6,226.02 km) |
| Niagara Falls to Arnedo | 3,761.73 mi (6,053.93 km) |
| Niagara Falls to Arona | 3,566.54 mi (5,739.80 km) |
| Niagara Falls to Arrecife | 3,689.99 mi (5,938.47 km) |
| Niagara Falls to Arrigorriaga | 3,693.95 mi (5,944.83 km) |
| Niagara Falls to Arroyomolinos | 3,746.08 mi (6,028.73 km) |
| Niagara Falls to Arteijo | 3,438.38 mi (5,533.53 km) |
| Niagara Falls to Arucas | 3,623.99 mi (5,832.25 km) |
| Niagara Falls to Aspe | 3,957.75 mi (6,369.39 km) |
| Niagara Falls to Astorga | 3,575.36 mi (5,753.98 km) |
| Niagara Falls to Atarfe | 3,862.60 mi (6,216.26 km) |
| Niagara Falls to Avila | 3,697.21 mi (5,950.08 km) |
| Niagara Falls to Aviles | 3,548.06 mi (5,710.05 km) |
