| Slough to Argentona | 702.04 mi (1,129.82 km) |
| Slough to Arico el Nuevo | 1,809.79 mi (2,912.57 km) |
| Slough to Armilla | 1,003.07 mi (1,614.29 km) |
| Slough to Arnedo | 645.92 mi (1,039.50 km) |
| Slough to Arona | 1,819.90 mi (2,928.84 km) |
| Slough to Arrecife | 1,695.32 mi (2,728.35 km) |
| Slough to Arrigorriaga | 583.43 mi (938.95 km) |
| Slough to Arroyomolinos | 792.67 mi (1,275.68 km) |
| Slough to Arteijo | 676.31 mi (1,088.42 km) |
| Slough to Arucas | 1,792.03 mi (2,884.00 km) |
| Slough to Aspe | 909.50 mi (1,463.70 km) |
| Slough to Astorga | 675.95 mi (1,087.84 km) |
| Slough to Atarfe | 998.61 mi (1,607.11 km) |
| Slough to Avila | 775.17 mi (1,247.52 km) |
| Slough to Aviles | 602.51 mi (969.64 km) |
