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| IATA | Airport | City | Country | ICAO |
| O62 | Carmel Valley Airport | Carmel Valley | United States | |
| OAA | Shank Air Base | Shank Air Base | Afghanistan | OASH |
| OAG | Orange Airport | Orange | Australia | YORG |
| OAH | Shindand Airport | Shindand | Afghanistan | OASD |
| OAI | Bagram Air Base | Bagram | Afghanistan | OAIX |
| OAJ | Albert J. Ellis Airport | Jacksonville | United States | KOAJ |
| OAK | Oakland International Airport | Oakland | United States | KOAK |
| OAL | Cacoal Airport | Cacoal | Brazil | |
| OAM | Oamaru Airport | Oamaru | New Zealand | NZOU |
| OAN | Olanchito Airport | Olanchito | Honduras | |
| OAR | Marina Municipal Airport | Marina | United States | KOAR |
| OAS | Sharana Airstrip | Sharana | Afghanistan | OASA |
| OAX | Xoxocotlán International Airport | Oaxaca | Mexico | MMOX |
| OAZ | Camp Bastion Airport | Camp Bastion | Afghanistan | OAZI |
| OBA | Oban Airport | Oban | Australia | |
| OBC | Obock Airport | Obock | Djibouti | HDOB |
| OBD | Obano Airport | Obano-Papua Island | Indonesia | |
| OBF | Oberpfaffenhofen Airport | Oberpfaffenhofen | Germany | EDMO |
| OBI | Óbidos Airport | Óbidos | Brazil | SNTI |
| OBK | Sky Harbor Airport | Northbrook | United States | |
| OBL | Oostmalle Air Base | Zoersel | Belgium | EBZR |
| OBM | Morobe Airport | Morobe | Papua New Guinea | |
| OBN | Oban Airport | North Connel | United Kingdom | EGEO |
| OBO | Tokachi-Obihiro Airport | Obihiro | Japan | RJCB |
| OBS | Aubenas-Ardèche Méridional Airport | Aubenas/Ardèche Méridional | France | LFHO |
| OBT | Oakland/Coliseum Stat Airport | Oakland, MD | United States | |
| OBU | Kobuk Airport | Kobuk | United States | PAOB |
| OBX | Obo Airport | Obo | Papua New Guinea | |
| OBY | Ittoqqortoormiit Airport | Ittoqqortoormiit | Greenland | BGSC |
| OCA | Ocean Reef Airport | Ocean Reef | United States | |
| OCC | Francisco de Orellana Airport | Coca | Ecuador | SECO |
| OCE | Municipal Airport | Ocean City | United States | |
| OCF | Ocala International Airport | Ocala, FL | United States | |
| OCH | A L Mangham Jr. Regional Airport | Nacogdoches, TX | United States | |
| OCI | Oceanic Airport | Oceanic | United States | |
| OCJ | Boscobel Aerodrome Airport | Ocho Rios | Jamaica | MKBS |
| OCN | Municipal Airport | Oceanside | United States | |
| OCV | Aguas Claras Airport | Ocaña | Colombia | SKOC |
| OCW | Warren Field Airport | Washington | United States | |
| ODA | Ouadda Airport | Ouadda | Central African Republic | FEFW |
| ODB | Córdoba Airport | Córdoba | Spain | LEBA |
| ODC | Oakdale Airport | Oakdale | United States | |
| ODD | Oodnadatta Airport | Oodnadatta | Australia | YOOD |
| ODE | Odense Airport | Odense | Denmark | EKOD |
| ODH | RAF Odiham Airport | Odiham | United Kingdom | EGVO |
| ODJ | Ouanda Djallé Airport | Ouanda Djallé | Central African Republic | FEGO |
| ODL | Cordillo Downs Airport | Cordillo Downs | Australia | YCOD |
| ODN | Long Seridan Airport | Long Seridan | Malaysia | WBGI |
| ODO | Bodaybo Airport | Bodaybo | Russia | UIKB |
| ODR | Ord River Airport | Ord River | Australia | YORV |
| ODS | Odessa International Airport | Odessa | Ukraine | UKOO |
| ODW | AJ Eisenberg Airport | Oak Harbor | United States | |
| ODY | Oudomsay Airport | Oudomsay | Laos | VLOS |
| OEA | Oneal Airport | Vincennes | United States | |
| OEC | Oecussi Airport | Oecussi-Ambeno | Timor-Leste | WPOC |
| OEL | Oryol Yuzhny Airport | Orel | Russia | UUOR |
| OEM | Vincent Fayks Airport | Paloemeu | Suriname | SMPA |
| OEO | L O Simenstad Municipal Airport | Osceola, WI | United States | |
| OER | Örnsköldsvik Airport | Örnsköldsvik | Sweden | ESNO |
| OES | Antoine De St Exupery Airport | San Antonio Oeste | Argentina | SAVN |
| OFI | Ouango Fitini Airport | Ouango Fitini | Côte d’Ivoire | DIOF |
| OFJ | Ólafsfjörður Airport | Ólafsfjörður | Iceland | BIOF |
| OFK | Stefan Field Airport | Norfolk | United States | |
| OFU | Ofu Village Airport | Ofu Village | American Samoa | NSAS |
| OGA | Searle Field Airport | Ogallala | United States | |
| OGB | Municipal Airport | Orangeburg | United States | |
| OGD | Municipal Airport | Ogden | United States | |
| OGE | Ogeranang Airport | Ogeranang | Papua New Guinea | AYOG |
| OGG | Kahului Airport | Kahului | United States | PHOG |
| OGL | Ogle Airport | Ogle | Guyana | SYGO |
| OGN | Yonaguni Airport | Yonaguni | Japan | ROYN |
| OGO | Abengourou Airport | Abengourou | Côte d’Ivoire | DIAU |
| OGR | Bongor Airport | Bongor | Chad | FTTB |
| OGS | Ogdensburg International Airport | Ogdensburg | United States | KOGS |
| OGU | Orgi Airport | Gülyalı | Turkey | LTCB |
| OGV | Ongava Game Reserve Airport | Ongava Game Reserve | Namibia | |
| OGX | Ain el Beida Airport | Ouargla | Algeria | DAUU |
| OGZ | Beslan Airport | Beslan | Russia | URMO |
| OHA | RNZAF Base Ohakea Airport | RNZAF Base Ohakea | New Zealand | NZOH |
| OHC | AFS Airport | Northeast Cape | United States | |
| OHD | Ohrid Airport | Ohrid | Macedonia | LWOH |
| OHE | Gu-Lian Airport | Mohe | China | ZYMH |
| OHH | Okha Airport | Okha | Russia | UHSH |
| OHI | Oshakati Airport | Oshakati | Namibia | |
| OHO | Okhotsk Airport | Okhotsk | Russia | UHOO |
| OHR | Wyk auf Föhr Airport | Wyk auf Föhr | Germany | EDXY |
| OHT | Kohat Airport | Kohat | Pakistan | OPKT |
| OIA | Ourilândia do Norte Airport | Ourilândia do Norte | Brazil | |
| OIC | Eaton Airport | Norwich | United States | |
| OIL | Splane Memorial Airport | Oil City, PA | United States | |
| OIM | Oshima Airport | Izu Oshima | Japan | RJTO |
| OIR | Okushiri Airport | Okushiri Island | Japan | RJEO |
| OIT | Oita Airport | Oita | Japan | RJFO |
| OJC | Johnson County Executive Airport | Olathe, KS | United States | |
| OKA | Naha Airport | Naha | Japan | ROAH |
| OKB | Orchid Beach Airport | Orchid Beach | Australia | |
| OKC | Will Rogers World Airport | Oklahoma City | United States | KOKC |
| OKD | Okadama Airport | Sapporo | Japan | RJCO |
| OKE | Okinoerabu Airport | Okinoerabujima | Japan | RJKB |
| OKF | Okaukuejo Airport | Okaukuejo | Namibia | FYOO |
| OKG | Okoyo Airport | Okoyo | Congo (Brazzaville) | |
| OKH | RAF Cottesmore Airport | Cottesmore | United Kingdom | EGXJ |
| OKI | Oki Airport | Okinoshima | Japan | RJNO |
| OKJ | Okayama Airport | Okayama City | Japan | RJOB |
| OKK | Kokomo Airport | Kokomo | United States | |
| OKL | Oksibil Airport | Oksibil-Papua Island | Indonesia | WAJO |
| OKM | Okmulgee Airport | Okmulgee | United States | |
| OKN | Okondja Airport | Okondja | Gabon | FOGQ |
| OKO | Yokota Air Base | Fussa | Japan | RJTY |
| OKP | Oksapmin Airport | Oksapmin | Papua New Guinea | |
| OKQ | Okaba Airport | Okaba-Papua Island | Indonesia | WAKO |
| OKR | Yorke Island Airport | Yorke Island | Australia | YYKI |
| OKS | Garden County Airport | Oshkosh, NE | United States | |
| OKT | Oktyabrskiy Airport | Kzyl-Yar | Russia | UWUK |
| OKU | Mokuti Lodge Airport | Mokuti Lodge | Namibia | FYMO |
| OKV | Okao Airport | Okao | Papua New Guinea | |
| OKY | Oakey Airport | Oakey | Australia | YBOK |
| OLA | Ørland Airport | Ørland | Norway | ENOL |
| OLB | Olbia-Costa Smerelda Airport | Olbia | Italy | LIEO |
| OLC | Senadora Eunice Micheles Airport | São Paulo De Olivença | Brazil | SDCG |
| OLD | Old Town Municipal Airport and Seaplane Base (DeWitt Field) Airport | Old Town | United States | KOLD |
| OLE | Municipal Airport | Olean | United States | |
| OLH | Old Harbor SPB Airport | Old Harbor | United States | |
| OLI | Rif Airport | Rif | Iceland | BIRF |
| OLJ | North West Santo Airport | Olpoi | Vanuatu | NVSZ |
| OLK | Fuerte Olimpo Airport | Fuerte Olimpo | Paraguay | SGOL |
| OLM | Olympia Airport | Olympia | United States | KOLM |
| OLN | Colonia Sarmiento Airport | Colonia Sarmiento | Argentina | |
| OLO | Olomouc Airport | Olomouc | Czechia | |
| OLP | Olympic Dam Airport | Olympic Dam | Australia | YOLD |
| OLQ | Olsobip Airport | Olsobip | Papua New Guinea | |
| OLR | Salerno Landing Zone Airport | Salerno Landing Zone | Afghanistan | |
| OLS | Nogales International Airport | Nogales, AZ | United States | |
| OLV | Olive Branch Arpt Airport | Olive Branch | United States | |
| OLY | Olney-Noble Airport | Olney, IL | United States | |
| OMA | Eppley Airfield Airport | Omaha | United States | KOMA |
| OMB | Omboue Hopital Airport | Omboue | Gabon | FOOH |
| OMC | Ormoc Airport | Ormoc City | Philippines | RPVO |
| OMD | Oranjemund Airport | Oranjemund | Namibia | FYOG |
| OME | Nome Airport | Nome | United States | PAOM |
| OMF | King Hussein Air College Airport | Mafraq | Jordan | OJMF |
| OMG | Omega Airport | Omega | Namibia | FYOE |
| OMH | Urmia Airport | Urmia | Iran | OITR |
| OMI | Omidiyeh Air Base | Omidiyeh | Iran | OIAJ |
| OMJ | Omura Airport | Omura | Japan | |
| OMK | Municipal Airport | Omak, WA | United States | |
| OML | Omkalai Airport | Omkalai | Papua New Guinea | |
| OMM | Marmul Airport | Marmul | Oman | OOMX |
| OMN | Osmanabad Airport | Osmanabad | India | |
| OMO | Mostar International Airport | Mostar | Bosnia and Herzegovina | LQMO |
| OMR | Oradea International Airport | Oradea | Romania | LROD |
| OMS | Omsk Airport | Omsk | Russia | UNOO |
| OMY | Oddor Meanche Airport | Oddor Meanche | Cambodia | |
| ONA | Municipal Airport | Winona | United States | |
| ONB | Ononge Airport | Onange Mission | Papua New Guinea | |
| OND | Ondangwa Airport | Ondangwa | Namibia | FYOA |
| ONE | Onepusu Airport | Onepusu | Solomon Islands | |
| ONG | Mornington Island Airport | Mornington Island | Australia | YMTI |
| ONH | Municipal Airport | Oneonta | United States | |
| ONI | Moanamani Airport | Moanamani-Papua Island | Indonesia | WABD |
| ONJ | Odate-Noshiro Airport | Odate | Japan | RJSR |
| ONL | Municipal Airport | Oneill | United States | |
| ONM | Socorro Airport | Socorro | United States | |
| ONN | Onion Bay Airport | Onion Bay | United States | |
| ONO | Ontario Municipal Airport | Ontario, OR | United States | |
| ONP | Newport Airport | Newport | United States | |
| ONQ | Zonguldak Airport | Zonguldak | Turkey | LTAS |
| ONR | Monkira Airport | Monkira | Australia | YMNK |
| ONS | Onslow Airport | Onslow | Australia | |
| ONT | LA/Ontario International Airport | Ontario | United States | KONT |
| ONU | Ono-I-Lau Airport | Ono-I-Lau | Fiji | NFOL |
| ONX | Enrique Adolfo Jiménez Airport | Colón | Panama | MPEJ |
| ONY | Olney Airport | Olney | United States | |
| OOA | Municipal Airport | Oskaloosa | United States | |
| OOK | Toksook Bay Airport | Toksook Bay | United States | PAOO |
| OOL | Gold Coast Airport | Gold Coast | Australia | YBCG |
| OOM | Cooma Snowy Mountains Airport | Cooma | Australia | YCOM |
| OOR | Mooraberree Airport | Mooraberree | Australia | YMOO |
| OOT | Onotoa Airport | Onotoa | Kiribati | NGON |
| OOX | Melitopol Air Base | Melitopol | Ukraine | UKDM |
| IATA | Airport | City | Country | ICAO |
| OPA | Kópasker Airport | Kópasker | Iceland | BIKP |
| OPB | Open Bay Airport | Open Bay | Papua New Guinea | |
| OPF | Opa Locka Airport | Miami, FL | United States | |
| OPI | Oenpelli Airport | Oenpelli | Australia | YOEN |
| OPL | St Landry Parish Airport | Opelousas | United States | |
| OPO | Francisco Sá Carneiro Airport | Porto | Portugal | LPPR |
| OPS | Presidente João Batista Figueiredo Airport | Sinop | Brazil | SWSI |
| OPU | Balimo Airport | Balimo | Papua New Guinea | AYBM |
| OPW | Opuwa Airport | Opuwa | Namibia | |
| ORA | Orán Airport | Orán | Argentina | SASO |
| ORB | Örebro Airport | Örebro | Sweden | ESOE |
| ORC | Orocue Airport | Orocue | Colombia | SKOE |
| ORD | O’Hare International Airport | Chicago | United States | KORD |
| ORE | Orléans-Bricy (BA 123) Air Base | Orléans/Bricy | France | LFOJ |
| ORF | Norfolk International Airport | Norfolk | United States | KORF |
| ORG | Zorg en Hoop Airport | Paramaribo | Suriname | SMZO |
| ORH | Worcester Regional Airport | Worcester | United States | KORH |
| ORI | Port Lions SPB Airport | Port Lions | United States | |
| ORJ | Orinduik Airport | Orinduik | Guyana | SYOR |
| ORK | Cork International Airport | Cork | Ireland | EICK |
| ORL | Orlando Executive Airport | Orlando | United States | |
| ORM | Sywell Aerodrome Airport | Northampton | United Kingdom | EGBK |
| ORN | Es Senia Airport | Oran | Algeria | DAOO |
| ORO | Yoro Airport | Yoro | Honduras | |
| ORP | Orapa Airport | Orapa | Botswana | FBOR |
| ORR | Yorketown Airport | Yorketown | Australia | YYOR |
| ORS | Waterport Airport | Orpheus Island Resort | Australia | |
| ORT | Northway Airport | Northway | United States | PAOR |
| ORU | Juan Mendoza Airport | Oruro | Bolivia | SLOR |
| ORV | Robert (Bob) Curtis Memorial Airport | Noorvik | United States | PFNO |
| ORW | Ormara Airport | Ormara Raik | Pakistan | OPOR |
| ORX | Oriximiná Airport | Oriximiná | Brazil | SNOX |
| ORY | Orly International Airport | Paris | France | LFPO |
| ORZ | Orange Walk Airport | Orange Walk | Belize | |
| OSB | Mosul International Airport | Mosul | Iraq | ORBM |
| OSC | Oscoda-Wurtsmith AFB Airport | Oscoda, MI | United States | |
| OSD | Åre Östersund Airport | Östersund | Sweden | ESNZ |
| OSE | Omora Airport | Omora | Papua New Guinea | AYOM |
| OSG | Ossima Airport | Ossima | Papua New Guinea | |
| OSH | Wittman Regional Airport | Oshkosh | United States | KOSH |
| OSI | Osijek Airport | Osijek | Croatia | LDOS |
| OSK | Oskarshamn Airport | Oskarshamn | Sweden | ESMO |
| OSL | Oslo Airport, Gardermoen Airport | Oslo | Norway | ENGM |
| OSM | Mosul Airport | Mosul | Iraq | |
| OSN | Osan Air Base | Osan Air Base | South Korea | RKSO |
| OSO | Osborne Mine Airport | Osborne Mine | Australia | YOSB |
| OSP | Redzikowo Air Base | Redzikowo Air Base | Poland | EPSK |
| OSR | Ostrava-Mosnov International Airport | Ostrava | Czechia | LKMT |
| OSS | Osh Airport | Osh | Kyrgyzstan | UAFO |
| OST | Ostend-Bruges International Airport | Ostend | Belgium | EBOS |
| OSU | Ohio State University Airport | Columbus, OH | United States | |
| OSW | Orsk Airport | Orsk | Russia | UWOR |
| OSX | Attala County Airport | Kosciusko | United States | |
| OSY | Namsos Airport, Høknesøra Airport | Namsos | Norway | ENNM |
| OSZ | Koszalin Zegrze Airport | Koszalin Zegrze | Poland | EPKO |
| OTA | Mota Airport | Mota | Ethiopia | |
| OTC | Bol Airport | Bol | Chad | FTTL |
| OTD | Contadora Airport | Contadora Island | Panama | |
| OTG | Worthington Airport | Worthington | United States | |
| OTH | North Bend Municipal Airport | North Bend | United States | KOTH |
| OTI | Pitu Airport | Gotalalamo-Morotai Island | Indonesia | WAMR |
| OTJ | Otjiwarongo Airport | Otjiwarongo | Namibia | |
| OTK | Tillamook Airport | Tillamook | United States | KTMK |
| OTL | Boutilimit Airport | Boutilimit | Mauritania | GQNB |
| OTM | Ottumwa Industrial Airport | Ottumwa | United States | KOTM |
| OTN | Green Airport | Oaktown | United States | |
| OTO | Vor Airport | Otto | United States | |
| OTP | Henri Coandă International Airport | Bucharest | Romania | LROP |
| OTR | Coto 47 Airport | Corredores | Costa Rica | MRCC |
| OTS | Anacortes Airport | Anacortes, Wa | United States | |
| OTT | Andre Maggi Airport | Cotriguaçu | Brazil | |
| OTU | Otu Airport | Otu | Colombia | |
| OTV | Ontong Java Atoll Airstrip | Ontong Java Atoll | Solomon Islands | AGGQ |
| OTY | Oria Airport | Oria | Papua New Guinea | |
| OTZ | Ralph Wien Memorial Airport | Kotzebue | United States | PAOT |
| OUA | Ouagadougou Airport | Ouagadougou | Burkina Faso | DFFD |
| OUD | Oujda Angads Airport | Oujda | Morocco | GMFO |
| OUE | Ouesso Airport | Ouesso | Congo (Brazzaville) | FCOU |
| OUG | Ouahigouya Airport | Ouahigouya | Burkina Faso | DFCC |
| OUH | Oudtshoorn Airport | Oudtshoorn | South Africa | FAOH |
| OUI | Ban Huoeisay Airport | Ban Huoeisay | Laos | VLHS |
| OUK | Outer Skerries Airport | Grunay Island | United Kingdom | |
| OUL | Oulu Airport | Oulu / Oulunsalo | Finland | EFOU |
| OUM | Oum Hadjer Airport | Oum Hadjer | Chad | |
| OUN | Max Westheimer Airport | Norman, OK | United States | |
| OUR | Batouri Airport | Batouri | Cameroon | FKKI |
| OUS | Ourinhos Airport | Ourinhos | Brazil | SDOU |
| OUT | Bousso Airport | Bousso | Chad | FTTS |
| OUU | Ouanga Airport | Ouanga | Gabon | |
| OUZ | Tazadit Airport | Zouérate | Mauritania | GQPZ |
| OVA | Bekily Airport | Bekily | Madagascar | FMSL |
| OVB | Novosibirsk Tolmachevo Airport | Novosibirsk | Russia | UNNT |
| OVD | Asturias Airport (Oviedo Airport) Airport | Ranón | Spain | LEAS |
| OVE | Oroville Airport | Oroville | United States | |
| OVG | Overberg Airport | Overberg | South Africa | FAOB |
| OVL | El Tuqui Airport | Ovalle | Chile | SCOV |
| OVR | Olavarria Airport | Olavarria | Argentina | SAZF |
| OVS | Sovetskiy Airport | Sovetskiy | Russia | USHS |
| OWA | Owatonna Airport | Owatonna | United States | |
| OWB | Owensboro-Daviess County Airport | Owensboro | United States | KOWB |
| OWE | Owendo Airport | Owendo | Gabon | |
| OWK | Central Maine Airport of Norridgewock Airport | Norridgewock | United States | |
| OXB | Osvaldo Vieiro International Airport | Bissau | Guinea-Bissau | GGOV |
| OXC | Waterbury-Oxford Airport | Oxford, CT | United States | |
| OXD | Miami University Airport | Oxford | United States | |
| OXF | Oxford (Kidlington) Airport | Kidlington | United Kingdom | EGTK |
| OXO | Orientos Airport | Orientos | Australia | |
| OXP | Saint-Georges-de-l’Oyapock Airport | Saint-Georges-de-l’Oyapock Airport | French Guiana | SOOG |
| OXR | Ventura County Camarillo Airport | Oxnard, CA | United States | |
| OXY | Morney Airport | Morney | Australia | YMNY |
| OYA | Goya Airport | Goya | Argentina | SATG |
| OYE | Oyem Airport | Oyem | Gabon | FOGO |
| OYG | Moyo Airport | Moyo | Uganda | |
| OYK | Oiapoque Airport ; Oiapoque, Amapa , Brasil Airport | Oiapoque | Brazil | SBOI |
| OYL | Moyale Airport | Moyale (Lower) | Kenya | HKMY |
| OYN | Ouyen Airport | Ouyen | Australia | YOUY |
| OYO | Tres Arroyos Airport | Tres Arroyos | Argentina | SAZH |
| OYP | St-Georges de lOyapock Airport | St Georges de lOyapock | French Guiana | |
| OYS | Yosemite Ntl Park Airport | Yosemite Ntl Park | United States | |
| OZA | Ozona Municipal Airport | Ozona | United States | |
| OZC | Labo Airport | Ozamiz City | Philippines | RPMO |
| OZG | Zagora Airport | Zagora | Morocco | GMAZ |
| OZH | Zaporizhzhia International Airport | Zaporizhia | Ukraine | UKDE |
| OZP | Moron Air Base | Morón | Spain | LEMO |
| OZR | Cairns AAF Airport | Ozark | United States | |
| OZZ | Ouarzazate Airport | Ouarzazate | Morocco | GMMZ |
| IATA | Airport | City | Country | ICAO |
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