| Iona to Cascais | 4,197.39 mi (6,755.05 km) |
| Iona to Castelo Branco | 4,281.37 mi (6,890.20 km) |
| Iona to Castro Daire | 4,243.51 mi (6,829.27 km) |
| Iona to Celorico de Basto | 4,233.49 mi (6,813.15 km) |
| Iona to Chamusca | 4,237.04 mi (6,818.86 km) |
| Iona to Chaves | 4,255.43 mi (6,848.46 km) |
| Iona to Cinfaes | 4,230.54 mi (6,808.40 km) |
| Iona to Coimbra | 4,227.60 mi (6,803.67 km) |
| Iona to Condeixa-a-Nova | 4,225.26 mi (6,799.90 km) |
| Iona to Corroios | 4,212.65 mi (6,779.61 km) |
| Iona to Coruche | 4,240.49 mi (6,824.41 km) |
| Iona to Costa de Caparica | 4,207.74 mi (6,771.71 km) |
| Iona to Covilha | 4,274.52 mi (6,879.18 km) |
| Iona to Eiras | 4,227.44 mi (6,803.40 km) |
| Iona to Elvas | 4,314.08 mi (6,942.84 km) |
