| UAB | Incirlik Air Base | Adana | TR |
| UAC | San Luis Rio Colorado Airport | San Luis Rio Colorado | MX |
| UAE | Mount Aue Airport | Mount Aue | PG |
| UAH | Ua Huka Airport | Ua Huka | PF |
| UAI | Suai Airport | Suai | TL |
| UAK | Narsarsuaq Airport | Narsarsuaq | GL |
| UAL | Luau Airport | Luau | AO |
| UAM | Andersen AFB | Guam | GU |
| UAP | Ua Pou Airport | Ua Pou, Marquesas Island | PF |
| UAQ | San Juan Airport | San Juan | AR |
| UAR | Bouarfa Airport | Bouarfa | MA |
| UAS | Buffalo Spring Airport | Samburu | KE |
| UAX | Uaxactun Airport | Uaxactun | GT |
| UBA | Uberaba Airport | Uberaba | BR |
| UBB | Mabuiag Island Airport | Mabuiag Island | AU |
| UBI | Buin Airport | Buin | PG |
| UBJ | Yamaguchi-Ube Airport | Ube | JP |
| UBP | Muang Ubon Airport | Ubon Ratchathani | TH |
| UBR | Ubrub, Irian Jaya Airport | Ubrub, Irian Jaya | ID |
| UBS | Lowndes County Airport | Columbus | US |
| UBT | Ubatuba Airport | Ubatuba | BR |
| UBU | Kalumburu Airport | Kalumburu | AU |
| UCA | Oneida County Airport | Utica | US |
| UCC | Yucca Flat Airport | Yucca Flat | US |
| UCE | Eunice Airport | Eunice | US |
| UCK | Lutsk Airport | Lutsk | UA |
| UCN | Buchanan Airport | Buchanan | LR |
| UCT | Ukhta Airport | Ukhta | RU |
| UCY | Everett-Stewart Airport | Union City | US |
| UDA | Undara Airport | Undara | AU |
| UDD | Bermuda Dunes Airport | Palm Springs | US |
| UDE | Volkel Air Base | Uden | NL |
| UDI | Tn Cl Av C. Bombonato | Uberlandia | BR |
| UDJ | Uzhhorod International Airport | Uzhhorod | UA |
| UDN | Campoformido Airport | Udine | IT |
| UDR | Maharana Pratap Airport | Udaipur | IN |
| UEE | Queenstown Airport | Queenstown | AU |
| UEL | Quelimane Airport | Quelimane | MZ |
| UEN | Urengoy Airport | Urengoy | RU |
| UEO | Kume-jima Airport | Kume-jima | JP |
| UER | Puertollano Railway Station | Puertollano | ES |
| UES | Waukesha Airport | Waukesha | US |
| UET | Quetta International Airport | Quetta | PK |
| UFA | Ufa Airport | Ufa | RU |
| UGA | Bulgan Airport | Bulgan | MN |
| UGB | Ugashik Bay Airport | Pilot Point | US |
| UGC | Urgench International Airport | Urgench | UZ |
| UGI | Uganik Airport | Uganik | US |
| UGN | Waukegan Memorial Airport | Waukegan | US |
| UGO | Uige Airport | Uige | AO |
| UGR | Railway Station | Burgos | ES |
| UGS | Ugashik Airport | Ugashik | US |
| UGT | Bulagtai Airport | Bulagtai | MN |
| UGU | Bilogai Airport | Bilogai | ID |
| UHE | Kunovice Airport | Uherske Hradiste | CZ |
| UIB | Quibdo Airport | Quibdo | CO |
| UIH | Phu Cat Airport | Qui Nhon | VN |
| UII | Utila Airport | Utila | HN |
| UIK | Ust-Ilimsk Airport | Ust-Ilimsk | RU |
| UIL | Quillayute State Airport | Quillayute | US |
| UIN | Quincy Municipal Airport | Quincy | US |
| UIO | Mariscal Sucre Airport | Quito | EC |
| UIP | Pluguffan Airport | Quimper | FR |
| UIQ | Quoin Hill Airport | Quoin Hill Island | VU |
| UIR | Quirindi Airport | Quirindi | AU |
| UIT | Jaluit Airport | Jaluit | MH |
| UIZ | Berz-Macomb Airport | Utica | US |
| UJE | Ujae Island Airport | Ujae Island | MH |
| UJN | Uljin Airport | Uljin | KR |
| UKA | Diani Airport | Ukunda | KE |
| UKB | Kobe Airport | Osaka | JP |
| UKG | Ust-Kuyga Airport | Ust-Kuyga | RU |
| UKH | Mukhaizna Airport | Mukhaizna | OM |
| UKI | Ukiah Airport | Ukiah | US |
| UKK | Ust-Kamenogorsk Airport | Ust-Kamenogorsk | KZ |
| UKN | Waukon Municipal Airport | Waukon | US |
| UKR | Mukeiras Airport | Mukeiras | YE |
| UKS | Belbek Airport | Sevastopol | UA |
| UKT | Upper Bucks Airport | Quakertown | US |
| UKU | Nuku Airport | Nuku | PG |
| UKX | Ust-Kut Airport | Ust-Kut | RU |
| UKY | Downton Heliport | Kyoto | JP |
| ULA | San Julian Airport | San Julian | AR |
| ULB | Ulei Airport | Ulei | VU |
| ULC | Los Cerrillos Airport | Santiago | CL |
| ULD | Prince M. Buthelezi Airport | Ulundi | ZA |
| ULE | Sule Airport | Sule | PG |
| ULG | Olgii Airport | Olgii | MN |
| ULH | Majeed Bin Abdulaziz Airport | Al Ula | SA |
| ULI | Ulithi Airport | Ulithi, Caroline Islands | FM |
| ULK | Lensk Airport | Lensk | RU |
| ULL | Mull Airport | Mull | GB |
| ULM | New Ulm Airport | New Ulm | US |
| ULN | Chinggis Khaan Int'l Airport | Ulaanbaatar | MN |
| ULO | Ulaangom Airport | Ulaangom | MN |
| ULP | Quilpie Airport | Quilpie | AU |
| ULQ | Farfan Airport | Tulua | CO |
| ULS | Mulatos Airport | Mulatos | CO |
| ULU | Gulu Airport | Gulu | UG |
| ULV | Baratayevka Airport | Ulyanovsk | RU |
| ULX | Ulusaba Airport | Ulusaba | ZA |
| ULY | Vostochny Airport | Ulyanovsk | RU |
| ULZ | Donoi Airport | Uliastai | MN |
| UMA | Punta De Maisi Airport | Punta De Maisi | CU |
| UMB | North Shore Airport | Umnak Island | US |
| UMC | Umba Airport | Umba | PG |
| UMD | Heliport | Uummannaq | GL |
| UME | Umea Airport | Umea | SE |
| UMI | Quincemil Airport | Quincemil | PE |
| UMM | Summit Airport | Summit | US |
| UMR | RAAF Bases | Woomera | AU |
| UMS | Ust-Maya Airport | Ust-Maya | RU |
| UMT | Umiat Airport | Umiat | US |
| UMU | Ernesto Geisel Airport | Umuarama | BR |
| UMY | Sumy Airport | Sumy | UA |
| UNA | Una Airport | Ilha Comandatuba/Una | BR |
| UNC | Unguia Airport | Unguia | CO |
| UND | Kunduz Airport | Kunduz | AF |
| UNE | Qacha's Nek Airport | Qacha's Nek | LS |
| UNG | Kiunga Airport | Kiunga | PG |
| UNI | Union Island Airport | Union Island | VC |
| UNK | Unalakleet Airport | Unalakleet | US |
| UNN | Ranong Airport | Ranong | TH |
| UNR | Ondorkhaan Airport | Ondorkhaan | MN |
| UNS | Umnak Island Airport | Umnak Island | US |
| UNT | Baltasound Airport | Unst | GB |
| UNU | Dodge County Airport | Juneau | US |
| UOL | Pogogul Airport | Buol | ID |
| UOS | Franklin County Airport | Sewanee | US |
| UOX | University-Oxford Airport | Oxford | US |
| UPA | Punta Alegre Airport | Punta Alegre | CU |
| UPB | Playa Baracoa Airport | Havana | CU |
| UPC | Off-Line Point | Puerto De La Cruz | ES |
| UPF | Off-Line Point | Pforzheim | DE |
| UPG | Sultan Hanuddin Airport | Makassar | ID |
| UPK | Heliport | Upernavik Kujalleq | GL |
| UPL | Upala Airport | Upala | CR |
| UPN | Uruapan Airport | Uruapan | MX |
| UPP | Upolu Point Airport | Upolu Point | US |
| UPR | Upiara Airport | Upiara | PG |
| UPV | Upavon Airport | Upavon | GB |
| UQE | Queen Airport | Queen | US |
| URA | Ak Zhol Airport | Uralsk | KZ |
| URB | Ernesto Pochler Airport | Urubupunga | BR |
| URC | Diwopu International Airport | Urumqi | CN |
| URD | Burg Feuerstein Airport | Burg Feuerstein | DE |
| URE | Kuressaare Airport | Kuressaare | EE |
| URG | Ruben Berta Airport | Uruguaiana | BR |
| URI | Uribe Airport | Uribe | CO |
| URJ | Uray Airport | Uray | RU |
| URM | Uriman Airport | Uriman | VE |
| URN | Urgun Airport | Urgun | AF |
| URO | Boos Airport | Rouen | FR |
| URR | Urrao Airport | Urrao | CO |
| URS | Vostochny Airport | Kursk | RU |
| URT | Surat Thani Airport | Surat Thani | TH |
| URU | Oro Province Airport | Uroubi | PG |
| URY | Gurayat Airport | Gurayat | SA |
| URZ | Uruzgan Airport | Uruzgan | AF |
| USA | Concord Regional Airport | Concord | US |
| USC | Off-Line Point | Union | US |
| USH | Islas Malvinas Airport | Ushuaia | AR |
| USI | Mabaruma Airport | Mabaruma | GY |
| USK | Usinsk Airport | Usinsk | RU |
| USL | Useless Loop Airport | Useless Loop | AU |
| USM | Ko Samui Airport | Ko Samui | TH |
| USN | Ulsan Airport | Ulsan | KR |
| USO | Usino Airport | Usino | PG |
| USQ | Usak Airport | Usak | TR |
| USR | Ust-Nera Airport | Ust-Nera | RU |
| USS | Sancti Spiritus Airport | Sancti Spiritus | CU |
| UST | St Augustine Aiport | St Augustine | US |
| USU | Francisco B. Reyes Airport | Busuanga | PH |
| UTA | Mutare Airport | Mutare | ZW |
| UTB | Muttaburra Airport | Muttaburra | AU |
| UTC | Soesterberg Airport | Utrecht | NL |
| UTD | Nutwood Downs Airport | Nutwood Downs | AU |
| UTG | Quthing Airport | Quthing | LS |
| UTH | Udon Thani International Airport | Udon Thani | TH |
| UTI | Utti Airport | Utti | FI |
| UTK | Utirik Island Airport | Utirik Island | MH |
| UTL | Railway Station | Torremolinos | ES |
| UTM | Tunica Municipal Airport | Tunica | US |
| UTN | Upington Airport | Upington | ZA |
| UTO | Indian Mountain Air Force Station | Utopia Creek | US |
| UTP | Rayong-Pattaya International Airport | U-Tapao | TH |
| UTR | Uttaradit Airport | Uttaradit | TH |
| UTS | Ust-Tsilma Airport | Ust-Tsilma | RU |
| UTT | K.D. Matanzima Airport | Umtata | ZA |
| UTU | Ustupo Airport | Ustupo | PA |
| UTW | Queenstown Airport | Queenstown | ZA |
| UUA | Bugulma Airport | Bugulma | RU |
| UUD | Mukhino Airport | Ulan-Ude | RU |
| UUK | Kuparuk Airport | Kuparuk | US |
| UUN | Baruun-Urt Airport | Baruun-Urt | MN |
| UUS | Khomutovo Airport | Yuzhno-Sakhalinsk | RU |
| UUU | Manumu Airport | Manumu | PG |
| UVA | Garner Field | Uvalde | US |
| UVE | Ouloup Airport | Ouvea | NC |
| UVF | Hewanorra Airport | St Lucia | LC |
| UVL | Kharga Airport | New Valley | EG |
| UVO | Uvol Airport | Uvol | PG |
| UWA | Ware Airport | Ware | US |
| UWE | Hbf Railway Station | Wiesbaden | DE |
| UWP | Hbf Railway Station | Wuppertal | DE |
| UYL | Nyala Airport | Nyala | SD |
| UYN | Yuyang Airport | Yulin | CN |
| UYU | Uyuni Airport | Uyuni | BO |
| UZC | Ponikve Airport | Uzice | RS |
| UZH | Unayzah Airport | Unayzah | SA |
| UZM | Hope Bay Airport | Hope Bay | CA |
| UZR | Urdzhar Airport | Urdzhar | KZ |
| UZU | Curuzu Cuatia Airport | Curuzu Cuatia | AR |