| Airport Code | City | State/Region | Country | Airport Name |
| CJU | Cheju | | South Korea | Cheju |
| CKB | Clarksburg | WV | USA | Clarksburg-Benedum Airport |
| CKS | Carajas | Para | Brazil | International / Brasilia Brazil |
| CKY | Conakry | | Guinea | Conakry |
| CLD | Carlsbad | CA | USA | Carlsbad/Palomar Airport |
| CLE | Cleveland | OH | USA | Hopkins International Airport |
| CLJ | Cluj | | Romania | Cluj |
| CLL | College Station | TX | USA | |
| CLM | Port Angeles | WA | USA | Wm Fairchild Intl Airport |
| CLO | Cali | | Colombia | Alfonso Bonilla Aragon |
| CLQ | Colima | Colima | Mexico | |
| CLT | Charlotte | NC | USA | Charlotte/Douglas Intl Airport |
| CLY | Calvi | Corsica | France | Ste Catherine |
| CMB | Colombo | | Sri Lanka | Katunayake International |
| CME | Ciudad Del Carmen | Campeche | Mexico | |
| CMF | Chambery | | France | Chambery Aix-Les-Bains |
| CMG | Corumba | Mato Grosso Do Sul | Brazil | Corumba |
| CMH | Columbus | OH | USA | Port Columbus Intl Airport |
| CMI | Champaign | IL | USA | Univ Of Illinois-Willard Airport |
| CMN | Casablanca | | Morocco | Mohamed V |