| Houston to Collegno | 5,363.47 mi (8,631.68 km) |
| Houston to Cologno al Serio | 5,434.57 mi (8,746.10 km) |
| Houston to Cologno Monzese | 5,419.07 mi (8,721.15 km) |
| Houston to Colorno | 5,486.39 mi (8,829.50 km) |
| Houston to Comacchio | 5,569.51 mi (8,963.26 km) |
| Houston to Comiso | 5,974.68 mi (9,615.32 km) |
| Houston to Como | 5,401.10 mi (8,692.24 km) |
| Houston to Concordia Sagittaria | 5,556.37 mi (8,942.12 km) |
| Houston to Concorezzo | 5,419.28 mi (8,721.49 km) |
| Houston to Conegliano | 5,529.55 mi (8,898.96 km) |
| Houston to Conselice | 5,561.94 mi (8,951.07 km) |
| Houston to Conselve | 5,536.51 mi (8,910.16 km) |
| Houston to Conversano | 5,921.82 mi (9,530.25 km) |
| Houston to Copertino | 5,989.98 mi (9,639.95 km) |
| Houston to Copparo | 5,547.60 mi (8,927.99 km) |
