| UAB | Incirlik Air Base | Adana |  Turkey |
| UAC | San Luis Rio Colorado Airport | Mexicali |  Mexico |
| UAE | Mount Aue Airport | Mount Hagen |  Papua New Guinea |
| UAH | Ua Huka Airport | Nuku Hiva |  French Polynesia |
| UAI | Suai Airport | Atambua |  Indonesia |
| UAK | Narsarsuaq Airport | Narsarsuaq |  Greenland |
| UAL | Luau Airport | Catumbela |  Angola |
| UAM | Andersen Air Force Base | Guam |  Guam |
| UAP | Ua Pou Airport | Nuku Hiva | French Polynesia |
| UAQ | Domingo Faustino Sarmiento Airport | San Juan |  Peru |
| UAS | Samburu Airport | Meru |  Kenya |
| UAX | Uaxactun Airport | Flores |  Guatemala |
| UBA | Uberaba Airport | Uberaba |  Brazil |
| UBB | Mabuiag Island Airport | Horn Island |  Australia |
| UBI | Buin Airport | Rabaul | Papua New Guinea |
| UBJ | Ube Airport | Ube |  Japan |
| UBP | Muang Ubon Airport | Ubon Ratchathani |  Thailand |
| UBR | Ubrub Airport | Jayapura | Indonesia |
| UBS | Lowndes County | Columbus |  United States of America |
| UBT | Ubatuba Airport | Sao Paulo | Brazil |
| UBU | Kalumburu Airport | Kununurra | Australia |
| UCA | Oneida County Airport | Syracuse | United States of America |
| UCC | Yucca Flat | Las Vegas | United States of America |
| UCE | Eunice Airport | Lafayette | United States of America |
| UCK | Lutsk Airport | Lviv |  Ukraine |
| UCN | Buchanan Airport | Monrovia |  Liberia |
| UCT | Ukhta Airport | Ukhta |  Russian Federation |
| UCY | Everett-Stewart Airport | Paducah | United States of America |
| UDA | Undarra Airport | Cairns | Australia |
| UDD | Bermuda Dunes | Palm Springs | United States of America |
| UDE | Volkel Air Base | Eindhoven |  Netherlands |
| UDI | Ten. Cel. Av. Cesar Bombonato Airport | Uberlandia | Brazil |
| UDJ | Uzhgorod Airport | Lviv | Ukraine |
| UDN | Campoformido Airport | Trieste |  Italy |
| UDO | Udomxay Airport | Luang Namtha |  Lao People's Democratic Republic |
| UDR | Dabok Airport | Udaipur |  India |
| UEE | Queenstown Airport | Burnie | Australia |
| UEL | Quelimane Airport | Quelimane |  Mozambique |
| UEO | Kumejima Airport | Kume-jima | Japan |
| UER | Puertollano Airport | Ciudad Real |  Spain |
| UES | Waukesha Airport | Milwaukee | United States of America |
| UET | Quetta Airport | Quetta |  Pakistan |
| UFA | Ufa International Airport | Ufa | Russian Federation |
| UGA | Bulgan Airport | Ulaanbaatar |  Mongolia |
| UGB | Ugashik Bay | Egegik | United States of America |
| UGC | Urgench Airport | Urgench |  Uzbekistan |
| UGI | San Juan (Uganik) Seaplane Base | West Point | United States of America |
| UGN | Waukegan National Airport | Chicago | United States of America |
| UGO | Uige Airport | Luanda | Angola |
| UGS | Ugashik Airport | Egegik | United States of America |
| UGT | Umnugobitour Airport | Ulaanbaatar | Mongolia |
| UGU | Bilogai Airport | Tembagapura | Indonesia |
| UHE | Kunovice Airport | Brno |  Czechia |
| UHF | RAF Station Airport | Brize Norton |  United Kingdom of Great Britain and Northern Ireland |
| UIB | Quibdo Airport | Quibdo |  Colombia |
| UIH | Qui Nhon Airport | Qui Nhon |  Viet Nam |
| UII | Utila Airport | La Ceiba |  Honduras |
| UIK | Ust-Ilimsk Airport | Bratsk | Russian Federation |
| UIL | Quillayute State Airport | Friday Harbor | United States of America |
| UIN | Quincy M Baldwin Field Airport | Quincy | United States of America |
| UIO | Mariscal Sucre International Airport | Quito |  Ecuador |
| UIP | Pluguffan Airport | Quimper |  France |
| UIQ | Quine Hill | Port Vila |  Vanuatu |
| UIR | Quirindi Airport | Tamworth | Australia |
| UIT | Jaluit Island Airport | Majuro |  Marshall Islands |
| UJE | Ujae Island Airport | Kwajalein | Marshall Islands |
| UKA | Ukunda Airport | Ukunda | Kenya |
| UKB | Kobe Airport | Osaka | Japan |
| UKI | Ukiah Municipal Airport | Santa Rosa | United States of America |
| UKK | Ust-kamenogorsk Airport | Ust-Kamenogorsk |  Kazakhstan |
| UKN | Waukon Municipal Airport | La Crosse | United States of America |
| UKR | Mukeiras Airport | Sana'a |  Yemen |
| UKS | Belbek Airport | Anapa | Russian Federation |
| UKT | Quakertown Airport | Allentown | United States of America |
| UKU | Nuku Airport | Wewak | Papua New Guinea |
| UKX | Ust-Kut Airport | Ust-Kut | Russian Federation |
| ULA | Capitan Jose Daniel Vazquez Airpor | Rio Gallegos |  Cuba |
| ULB | Ulei Airport | Norsup | Vanuatu |
| ULC | Los Cerrillos | Santiago |  Chile |
| ULD | Ulundi Airport | Richards Bay |  South Africa |
| ULE | Sule Airport | Hoskins | Papua New Guinea |
| ULG | Ulgit Airport | Khovd | Mongolia |
| ULI | Ulithi Airport | Yap, Caroline Islands |  Micronesia (Federated States of) |
| ULL | Glenforsa Airfield | Islay | United Kingdom of Great Britain and Northern Ireland |
| ULM | New Ulm Airport | Minneapolis | United States of America |
| ULN | Chinggis Khaan International Airport | Ulaanbaatar | Mongolia |
| ULO | Ulaangom Airport | Khovd | Mongolia |
| ULP | Quilpie Airport | Charleville | Australia |
| ULQ | Heriberto Gil Martinez Airport | Cali | Colombia |
| ULS | Mulatos Airport | Apartado | Colombia |
| ULU | Gulu Airport | Entebbe |  Uganda |
| ULV | Ulyanovsk Baratayevka Airport | Ulyanovsk | Russian Federation |
| ULX | Ulusaba Airport | Londolozi | South Africa |
| ULY | Ulyanovsk Vostochny Airport | Ulyanovsk | Russian Federation |
| ULZ | Donoi Airport | Khovd | Mongolia |
| UMA | Punta De Maisi Airport | Guantanamo | Cuba |
| UMB | North Shore | Nikolski | United States of America |
| UMC | Umba Airport | Lae | Papua New Guinea |
| UMD | Uummannaq Airport | Qaarsut | Greenland |
| UME | Umea Airport | Umea |  Sweden |
| UMI | Quincemil Airport | Cuzco | Peru |
| UMM | Summit Airport | Fairbanks | United States of America |
| UMR | Woomera Airport | Olympic Dam | Australia |
| UMT | Umiat Airport | Nuiqsut | United States of America |
| UMU | Orlando de Carvalho Airport | Cascavel | Brazil |
| UMY | Sumy Airport | Kharkov | Ukraine |
| UNA | Una-Comandatuba Airport | Ilheus | Brazil |
| UNC | Unguia Airport | Apartado | Colombia |
| UND | Kunduz Airport | Mazar-I-Sharif |  Afghanistan |
| UNE | Qachas Nek Airport | Maseru |  Lesotho |
| UNG | Kiunga Airport | Tabubil | Papua New Guinea |
| UNI | Union Island Airport | Saint Vincent |  Saint Vincent and the Grenadines |
| UNK | Unalakleet Airport | Unalakleet | United States of America |
| UNN | Ranong Airport | Ranong | Thailand |
| UNR | Underkhaan Airport | Ulaanbaatar | Mongolia |
| UNS | Umnak Airport | Nikolski | United States of America |
| UNT | Baltasound Airport | Shetland Islands | United Kingdom of Great Britain and Northern Ireland |
| UNU | Dodge County Airport | Madison | United States of America |
| UOL | Bandar Udara Pogogul / Pogogul Airport | Gorontalo | Indonesia |
| UON | Muong Sai Airport | Luang Namtha | Lao People's Democratic Republic |
| UOS | Franklin County Airport / Sewanee International | Chattanooga | United States of America |
| UOX | University-Oxford Airport | Tupelo | United States of America |
| UPA | Punta Alegre Airport | Cayo Coco | Cuba |
| UPB | Playa Baracoa | Havana | Cuba |
| UPC | Puerto La Cruz Airport | Barcelona |  Venezuela (Bolivarian Republic of) |
| UPF | Pforheim Airport | Karlsruhe/Baden Baden |  Germany |
| UPG | Sultan Hasanuddin International Airport | Ujung Pandang | Indonesia |
| UPL | Upala Airport | Liberia |  Costa Rica |
| UPN | Uruapan Airport | Uruapan | Mexico |
| UPP | Upolu Point Airport | Hana | United States of America |
| UPR | Upiara Airport | Daru | Papua New Guinea |
| UPV | RAF Upavon | Brize Norton | United Kingdom of Great Britain and Northern Ireland |
| UQE | Queen Airport | Dillingham | United States of America |
| URA | Oral Ak Zhol Airport / Podstepnyy | Uralsk | Kazakhstan |
| URB | Castilho Airport (Urubupunga Airport) | Aracatuba | Brazil |
| URC | Urumqi Airport | Urumqi |  China |
| URD | Burg Feuerstein Airport | Nuremberg | Germany |
| URE | Kuressaare Airport | Kuressaare |  Estonia |
| URG | Ruben Berta Airport | Uruguaiana | Brazil |
| URI | Uribe Airport | Neiva | Colombia |
| URJ | Uraj Airport | Uraj | Russian Federation |
| URM | Uriman Airport | Puerto Ordaz | Venezuela (Bolivarian Republic of) |
| URN | Urgoon Airport | Kabul | Afghanistan |
| URO | Rouen Airport (Vallee de Seine Airport) | Deauville | France |
| URR | Urrao Airport | Medellin | Colombia |
| URS | Kursk Airport | Kursk | Russian Federation |
| URT | Surat Thani Airport | Surat Thani | Thailand |
| URU | Uroubi | Popondetta | Papua New Guinea |
| URY | Gurayat Airport | Gurayat |  Saudi Arabia |
| URZ | Uruzgan Airport | Kandahar | Afghanistan |
| USH | Islas Malvinas Argentinas International Airport | Ushuaia |  Argentina |
| USI | Mabaruma Airport | Georgetown |  Guyana |
| USK | Usinsk Airport | Usinsk | Russian Federation |
| USL | Useless Loop Airport | Carnarvon | Australia |
| USM | Koh Samui Airport | Koh Samui | Thailand |
| USN | Ulsan Airport | Ulsan |  Korea (Republic of) |
| USO | Usino Airport | Madang | Papua New Guinea |
| USQ | Usak Airport | Kutahya | Turkey |
| USS | Sancti Spiritus Airport | Santa Clara | Cuba |
| UST | St Augustine Airport | Saint Augustine | United States of America |
| USU | Francisco Reyes Airport | Busuanga |  Philippines |
| UTA | Mutare Airport | Harare |  Zimbabwe |
| UTB | Muttaburra Airport | Longreach | Australia |
| UTC | Soesterberg Air Base | Hilversum | Netherlands |
| UTD | Nutwood Downs Airport | Mcarthur River | Australia |
| UTE | Butterworth Airport | Penang |  Malaysia |
| UTG | Quthing Airport | Maseru | Lesotho |
| UTH | Udon Thani International Airport | Udon Thani | Thailand |
| UTI | Utti Airport | Jyvaskyla |  Finland |
| UTK | Utirik Island Airport | Kwajalein | Marshall Islands |
| UTL | Torremolinos Airport | Malaga | Spain |
| UTM | Tunica Municipalcipal Airport | Memphis | United States of America |
| UTN | Upington Airport | Upington | South Africa |
| UTO | Indian Mountain AFS | Hughes | United States of America |
| UTP | Utapao Airport | Utapao | Thailand |
| UTR | Uttaradit Airport | Sukhothai | Thailand |
| UTT | Umtata Airport | Umtata | South Africa |
| UTU | Ustupo Airport | Panama City |  Panama |
| UTW | Queenstown Airport | East London | South Africa |
| UUA | Bugulma Airport | Bugulma | Russian Federation |
| UUD | Ulan-ude Mukhino Airport | Ulan-Ude | Russian Federation |
| UUK | Kuparuk Airport | Prudhoe Bay/Deadhorse | United States of America |
| UUN | Baruun-Urt Airport | Ulaanbaatar | Mongolia |
| UUS | Yuzhno-Sakhalinsk Airport | Yuzhno-Sakhalinsk | Russian Federation |
| UUU | Manumu Airport | Port Moresby | Papua New Guinea |
| UVA | Garner Field Airport | Del Rio | United States of America |
| UVE | Ouvea Airport | Ouvea |  New Caledonia |
| UVF | Hewanorra Airport | Saint Lucia |  Saint Lucia |
| UVL | Kharga Airport | Sohag |  Egypt |
| UVO | Uvol Airport | Hoskins | Papua New Guinea |
| UWA | Ware Airport | Worcester | United States of America |
| UYL | Nyala Airport | El Fasher |  Sudan |
| UYN | Yulin Yuyang Airport | Yulin | China |
| UZC | Uzice-Ponikve Airport | Belgrade |  Serbia |
| UZH | Unayzah Airport | Gassim | Saudi Arabia |
| UZU | Curuzu Cuatia Airport | Corrientes | Argentina |