| Duncan to Benavente | 4,733.39 mi (7,617.66 km) |
| Duncan to Bombarral | 4,706.87 mi (7,574.97 km) |
| Duncan to Bougado | 4,669.41 mi (7,514.69 km) |
| Duncan to Braga | 4,669.14 mi (7,514.25 km) |
| Duncan to Braganca | 4,737.10 mi (7,623.63 km) |
| Duncan to Cabeceiras de Basto | 4,688.24 mi (7,544.99 km) |
| Duncan to Cacem | 4,715.47 mi (7,588.81 km) |
| Duncan to Cadaval | 4,710.60 mi (7,580.98 km) |
| Duncan to Caldas da Rainha | 4,703.37 mi (7,569.33 km) |
| Duncan to Calheta | 4,511.87 mi (7,261.15 km) |
| Duncan to Camara de Lobos | 4,522.57 mi (7,278.38 km) |
| Duncan to Canico | 4,530.89 mi (7,291.76 km) |
| Duncan to Cantanhede | 4,699.04 mi (7,562.38 km) |
| Duncan to Carregal do Sal | 4,724.00 mi (7,602.55 km) |
| Duncan to Cartaxo | 4,728.30 mi (7,609.46 km) |
