| South Portland to Cadiz | 3,334.25 mi (5,365.95 km) |
| South Portland to Calafell | 3,550.42 mi (5,713.86 km) |
| South Portland to Calahorra | 3,353.61 mi (5,397.12 km) |
| South Portland to Calasparra | 3,497.04 mi (5,627.95 km) |
| South Portland to Calatayud | 3,398.35 mi (5,469.12 km) |
| South Portland to Caldas de Montbuy | 3,563.56 mi (5,735.00 km) |
| South Portland to Caldas de Reyes | 3,036.04 mi (4,886.04 km) |
| South Portland to Calella | 3,586.66 mi (5,772.17 km) |
| South Portland to Callosa de Segura | 3,539.50 mi (5,696.28 km) |
| South Portland to Calpe | 3,565.17 mi (5,737.58 km) |
| South Portland to Calvia | 3,648.35 mi (5,871.46 km) |
| South Portland to Camas | 3,317.94 mi (5,339.71 km) |
| South Portland to Cambados | 3,031.31 mi (4,878.42 km) |
| South Portland to Cambre | 3,031.80 mi (4,879.22 km) |
| South Portland to Cambrils | 3,531.28 mi (5,683.05 km) |
