| Duncan to Carmona | 4,933.93 mi (7,940.40 km) |
| Duncan to Cartagena | 5,148.04 mi (8,284.97 km) |
| Duncan to Cartama | 5,007.91 mi (8,059.45 km) |
| Duncan to Cartaya | 4,867.60 mi (7,833.64 km) |
| Duncan to Caspe | 5,058.98 mi (8,141.65 km) |
| Duncan to Cassa de la Selva | 5,161.90 mi (8,307.28 km) |
| Duncan to Castalla | 5,126.00 mi (8,249.49 km) |
| Duncan to Castellbisbal | 5,138.64 mi (8,269.84 km) |
| Duncan to Castelldefels | 5,145.72 mi (8,281.24 km) |
| Duncan to Castello de Ampurias | 5,156.65 mi (8,298.82 km) |
| Duncan to Castellon de la Plana | 5,104.39 mi (8,214.72 km) |
| Duncan to Castilleja de la Cuesta | 4,916.91 mi (7,913.00 km) |
| Duncan to Catarroja | 5,108.77 mi (8,221.77 km) |
| Duncan to Catral | 5,135.78 mi (8,265.25 km) |
| Duncan to Caudete | 5,107.52 mi (8,219.76 km) |
