| Boom to Cervello | 679.03 mi (1,092.80 km) |
| Boom to Cervera | 667.06 mi (1,073.52 km) |
| Boom to Ceuti | 939.69 mi (1,512.28 km) |
| Boom to Cheste | 837.98 mi (1,348.60 km) |
| Boom to Chiclana de la Frontera | 1,138.59 mi (1,832.38 km) |
| Boom to Chipiona | 1,125.13 mi (1,810.73 km) |
| Boom to Chiva | 839.03 mi (1,350.29 km) |
| Boom to Churriana de la Vega | 1,040.10 mi (1,673.88 km) |
| Boom to Ciempozuelos | 846.52 mi (1,362.34 km) |
| Boom to Cieza | 931.14 mi (1,498.53 km) |
| Boom to Cisterniga | 782.36 mi (1,259.08 km) |
| Boom to Ciudad de Melilla | 1,150.84 mi (1,852.09 km) |
| Boom to Ciudad Real | 927.33 mi (1,492.40 km) |
| Boom to Ciudad-Rodrigo | 892.68 mi (1,436.63 km) |
| Boom to Cocentaina | 883.86 mi (1,422.43 km) |
