| Helena to Cosham | 4,553.85 mi (7,328.71 km) |
| Helena to Costessey | 4,532.09 mi (7,293.69 km) |
| Helena to Cottingham | 4,429.55 mi (7,128.68 km) |
| Helena to Coulsdon | 4,558.44 mi (7,336.10 km) |
| Helena to Coventry | 4,463.92 mi (7,183.98 km) |
| Helena to Cowdenbeath | 4,234.40 mi (6,814.61 km) |
| Helena to Cowes | 4,550.72 mi (7,323.68 km) |
| Helena to Cowley | 4,537.91 mi (7,303.06 km) |
| Helena to Cowley | 4,505.68 mi (7,251.19 km) |
| Helena to Cramlington | 4,333.21 mi (6,973.63 km) |
| Helena to Cranleigh | 4,557.30 mi (7,334.26 km) |
| Helena to Crawley | 4,567.46 mi (7,350.62 km) |
| Helena to Crayford | 4,561.72 mi (7,341.37 km) |
| Helena to Crewe | 4,402.78 mi (7,085.58 km) |
| Helena to Crigglestone | 4,403.86 mi (7,087.33 km) |
