| Caister-on-Sea to Arcos de Valdevez | 883.49 mi (1,421.84 km) |
| Caister-on-Sea to Arcozelo | 937.07 mi (1,508.07 km) |
| Caister-on-Sea to Arganil | 975.28 mi (1,569.56 km) |
| Caister-on-Sea to Arouca | 935.13 mi (1,504.95 km) |
| Caister-on-Sea to Arruda dos Vinhos | 1,075.39 mi (1,730.67 km) |
| Caister-on-Sea to Aveiro | 963.23 mi (1,550.17 km) |
| Caister-on-Sea to Aver-o-Mar | 919.05 mi (1,479.07 km) |
| Caister-on-Sea to Aves | 905.35 mi (1,457.02 km) |
| Caister-on-Sea to Azambuja | 1,065.64 mi (1,714.98 km) |
| Caister-on-Sea to Baiao | 915.81 mi (1,473.85 km) |
| Caister-on-Sea to Barcelos | 908.43 mi (1,461.97 km) |
| Caister-on-Sea to Barreiro | 1,095.24 mi (1,762.62 km) |
| Caister-on-Sea to Batalha | 1,027.65 mi (1,653.85 km) |
| Caister-on-Sea to Beja | 1,110.43 mi (1,787.07 km) |
| Caister-on-Sea to Belas | 1,093.07 mi (1,759.13 km) |
