| Duncan to Arcos de Valdevez | 4,659.91 mi (7,499.40 km) |
| Duncan to Arcozelo | 4,674.52 mi (7,522.92 km) |
| Duncan to Arganil | 4,728.38 mi (7,609.60 km) |
| Duncan to Arouca | 4,696.67 mi (7,558.56 km) |
| Duncan to Arruda dos Vinhos | 4,720.17 mi (7,596.38 km) |
| Duncan to Aveiro | 4,687.34 mi (7,543.54 km) |
| Duncan to Aver-o-Mar | 4,657.61 mi (7,495.70 km) |
| Duncan to Aves | 4,678.13 mi (7,528.73 km) |
| Duncan to Azambuja | 4,727.01 mi (7,607.39 km) |
| Duncan to Baiao | 4,699.08 mi (7,562.44 km) |
| Duncan to Barcelos | 4,661.12 mi (7,501.35 km) |
| Duncan to Barreiro | 4,730.32 mi (7,612.72 km) |
| Duncan to Batalha | 4,711.51 mi (7,582.45 km) |
| Duncan to Beja | 4,807.50 mi (7,736.92 km) |
| Duncan to Belas | 4,717.05 mi (7,591.36 km) |
