| Mission to Argentona | 5,550.43 mi (8,932.55 km) |
| Mission to Arico el Nuevo | 4,924.70 mi (7,925.54 km) |
| Mission to Armilla | 5,389.10 mi (8,672.92 km) |
| Mission to Arnedo | 5,321.43 mi (8,564.01 km) |
| Mission to Arona | 4,916.41 mi (7,912.20 km) |
| Mission to Arrecife | 5,073.00 mi (8,164.21 km) |
| Mission to Arrigorriaga | 5,257.61 mi (8,461.30 km) |
| Mission to Arroyomolinos | 5,289.17 mi (8,512.10 km) |
| Mission to Arteijo | 4,991.52 mi (8,033.08 km) |
| Mission to Arucas | 4,982.05 mi (8,017.83 km) |
| Mission to Aspe | 5,496.24 mi (8,845.34 km) |
| Mission to Astorga | 5,128.06 mi (8,252.82 km) |
| Mission to Atarfe | 5,383.38 mi (8,663.71 km) |
| Mission to Avila | 5,240.95 mi (8,434.49 km) |
| Mission to Aviles | 5,107.94 mi (8,220.43 km) |
