| Boston to Cadiz | 1,175.71 mi (1,892.12 km) |
| Boston to Calafell | 816.86 mi (1,314.61 km) |
| Boston to Calahorra | 742.97 mi (1,195.69 km) |
| Boston to Calasparra | 1,021.82 mi (1,644.47 km) |
| Boston to Calatayud | 806.65 mi (1,298.17 km) |
| Boston to Caldas de Montbuy | 790.18 mi (1,271.68 km) |
| Boston to Caldas de Reyes | 819.33 mi (1,318.58 km) |
| Boston to Calella | 794.58 mi (1,278.75 km) |
| Boston to Callosa de Segura | 1,026.96 mi (1,652.73 km) |
| Boston to Calpe | 990.04 mi (1,593.32 km) |
| Boston to Calvia | 934.11 mi (1,503.30 km) |
| Boston to Camas | 1,114.06 mi (1,792.90 km) |
| Boston to Cambados | 829.33 mi (1,334.68 km) |
| Boston to Cambre | 770.37 mi (1,239.78 km) |
| Boston to Cambrils | 824.23 mi (1,326.48 km) |
