| UAK | BGBW | Narssarssuaq Airport, Greenland |
| UAQ | SANU | San Juan Airport, Argentina |
| UBJ | RJDC | Yamaguchi/Ube Airport, Japan |
| UCA | KUCA | Utica - Oneida County Airport, United States |
| UET | OPQT | Quetta Airport, Pakistan |
| UFA | UWUU | Ufa Airport, Russia |
| UHE | LKKU | Uherské Hradiste - Kunovice Airport, Czech Republic |
| UIO | SEQU | Quito - Mariscal Sucre Airport, Ecuador |
| UIP | LFRQ | Quimper - Pluguffan Airport, France |
| ULC | SCTI | Santiago - Los Cerillos Airport, Chile |
| ULN | ZMUB | Ulan Bator - Buyant Ukha Airport, Mongolia |
| ULY | UWLW | Ulyanovsk - Vostochny International Airport, Russia |
| UME | ESNU | Umeå Airport, Sweden |
| UND | OAUZ | Kunduz Airport, Afghanistan |
| UPN | MMPN | Uruapan - Licenciado Y Gen Ignacio Lopez Rayon Airport, Mexico |
| URC | ZWWW | Urumqi Diwopu International Airport, China PRC |
| URE | EEKE | Kuressaare Airport, Estonia |
| USA | LESL | San Luis Airport, Argentina |
| UTI | EFUT | Kouvola-Utti Airport, Finland |
| UTN | FAUP | Upington Airport, South Africa |
| UUS | UHSS | Yuzhno-Sakhalinsk Airport, Russia |
| UVF | TLPL | Saint Lucia - Hewanorra International Airport, Carib,St Lucia |
