| Duncan to Cehegin | 5,092.23 mi (8,195.16 km) |
| Duncan to Cervello | 5,140.62 mi (8,273.03 km) |
| Duncan to Cervera | 5,100.60 mi (8,208.62 km) |
| Duncan to Ceuti | 5,117.13 mi (8,235.23 km) |
| Duncan to Cheste | 5,093.27 mi (8,196.82 km) |
| Duncan to Chiclana de la Frontera | 4,945.17 mi (7,958.49 km) |
| Duncan to Chipiona | 4,920.69 mi (7,919.08 km) |
| Duncan to Chiva | 5,091.96 mi (8,194.72 km) |
| Duncan to Churriana de la Vega | 5,039.11 mi (8,109.66 km) |
| Duncan to Ciempozuelos | 4,935.49 mi (7,942.91 km) |
| Duncan to Cieza | 5,104.54 mi (8,214.96 km) |
| Duncan to Cisterniga | 4,837.55 mi (7,785.28 km) |
| Duncan to Ciudad de Melilla | 5,139.39 mi (8,271.06 km) |
| Duncan to Ciudad Real | 4,962.41 mi (7,986.22 km) |
| Duncan to Ciudad-Rodrigo | 4,786.48 mi (7,703.10 km) |
