| UAK | Narssarssuaq Airport |
| UAQ | San Juan Airport |
| UCA | Utica - Oneida County Airport |
| UET | Quetta Airport |
| UHE | Uherské Hradiste - Kunovice Airport |
| UIO | Quito - Mariscal Sucre Airport |
| UIP | Quimper - Pluguffan Airport |
| ULC | Santiago - Los Cerillos Airport |
| ULN | Ulan Bator - Buyant Ukha Airport |
| ULY | Ulyanovsk - Vostochny International Airport |
| UME | Umeå Airport |
| UND | Kunduz Airport |
| UPN | Uruapan - Licenciado Y Gen Ignacio Lopez Rayon Airport |
| URC | Urumqi - Diwopu Airport |
| URE | Kuressaare Airport |
| URS | Kursk Airport |
| USA | San Luis Airport |
| UTN | Upington Airport |
| UUS | Yuzhno-Sakhalinsk Airport |
| UVF | Saint Lucia - Hewanorra International Airport |
