| Houston to Caltagirone | 5,959.30 mi (9,590.57 km) |
| Houston to Caltanissetta | 5,929.04 mi (9,541.86 km) |
| Houston to Calvisano | 5,469.72 mi (8,802.66 km) |
| Houston to Calvizzano | 5,799.97 mi (9,334.15 km) |
| Houston to Camaiore | 5,519.39 mi (8,882.59 km) |
| Houston to Cameri | 5,393.96 mi (8,680.73 km) |
| Houston to Camisano Vicentino | 5,519.82 mi (8,883.29 km) |
| Houston to Campagna | 5,848.51 mi (9,412.27 km) |
| Houston to Campagnano di Roma | 5,675.10 mi (9,133.19 km) |
| Houston to Campi Bisenzio | 5,558.80 mi (8,946.03 km) |
| Houston to Campi Salentina | 5,983.03 mi (9,628.76 km) |
| Houston to Campiglia Marittima | 5,564.64 mi (8,955.42 km) |
| Houston to Campobasso | 5,794.31 mi (9,325.04 km) |
| Houston to Campobello di Licata | 5,931.95 mi (9,546.55 km) |
| Houston to Campobello di Mazara | 5,864.19 mi (9,437.50 km) |
