303 airports with IATA codes starting with O
| IATA | ICAO | Airport Name | City | Country | Type |
|---|---|---|---|---|---|
| OAA | OASH | Shank Air Base | Baraki Barak | 🇦🇫 Afghanistan | Small Airport |
| OAG | YORG | Orange Airport | Orange | 🇦🇺 Australia | Medium Airport |
| OAH | OASD | Shindand Air Base | Shindand | 🇦🇫 Afghanistan | Small Airport |
| OAI | OAIX | Bagram Airfield | Bagram | 🇦🇫 Afghanistan | Medium Airport |
| OAJ | KOAJ | Albert J Ellis Airport | Richlands | 🇺🇸 A.S | Medium Airport |
| OAK | KOAK | San Francisco Bay Oakland International Airport | Oakland | 🇺🇸 A.S | Large Airport |
| OAL | SSKW | Cacoal Airport | Cacoal | 🇧🇷 Brazil | Small Airport |
| OAM | NZOU | Oamaru Airport | 🇳🇿 New Zealand | Medium Airport | |
| OAN | MHEA | El Arrayán Airport | Olanchito | 🇭🇳 Honduras | Small Airport |
| OAR | KOAR | Marina Municipal Airport | Marina | 🇺🇸 A.S | Small Airport |
| OAS | OASA | Sharana Airstrip | Sharana | 🇦🇫 Afghanistan | Small Airport |
| OAX | MMOX | Xoxocotlán International Airport | Oaxaca | 🇲🇽 Mexico | Large Airport |
| OAZ | OAZI | Camp Shorabak Airfield | Lashkar Gah | 🇦🇫 Afghanistan | Small Airport |
| OBC | HDOB | Obock Airport | Obock | 🇩🇯 Djibouti | Small Airport |
| OBD | Obano Airport | Obano | 🇮🇩 Indonesia | Small Airport | |
| OBE | KOBE | Okeechobee County Airport | Okeechobee | 🇺🇸 A.S | Small Airport |
| OBF | EDMO | Oberpfaffenhofen Airport | Weßling | 🇩🇪 Jerman | Medium Airport |
| OBI | SNTI | Óbidos Municipal Airport | Óbidos | 🇧🇷 Brazil | Small Airport |
| OBL | EBZR | Oostmalle Airfield | Zoersel | 🇧🇪 Belgium | Small Airport |
| OBM | AYMB | Morobe Airport | Morobe | 🇵🇬 Papua New Guinea | Small Airport |
| OBN | EGEO | Oban Airport | North Connel | 🇬🇧 UK | Small Airport |
| OBO | RJCB | Tokachi-Obihiro Airport | Obihiro | 🇯🇵 Jepun | Medium Airport |
| OBS | LFHO | Aubenas-South Ardèche Airport | Lanas, Ardèche | 🇫🇷 Perancis | Medium Airport |
| OBU | PAOB | Kobuk Airport | Kobuk | 🇺🇸 A.S | Small Airport |
| OBX | AYOB | Obo Airport | Obo | 🇵🇬 Papua New Guinea | Small Airport |
| OCA | Ocean Reef Club Airport | Key Largo | 🇺🇸 A.S | Medium Airport | |
| OCC | SECO | Francisco De Orellana Airport | Coca | 🇪🇨 Ecuador | Medium Airport |
| OCE | KOXB | Ocean City Municipal Airport | Ocean City | 🇺🇸 A.S | Medium Airport |
| OCF | KOCF | Ocala International Airport - Jim Taylor Field | Ocala | 🇺🇸 A.S | Small Airport |
| OCH | KOCH | A L Mangham Jr. Regional Airport | Nacogdoches | 🇺🇸 A.S | Small Airport |
| OCJ | MKBS | Ian Fleming International Airport | Boscobel | 🇯🇲 Jamaica | Medium Airport |
| OCM | YBGD | Boolgeeda | 🇦🇺 Australia | Small Airport | |
| OCN | KOKB | Oceanside Municipal Airport | Oceanside | 🇺🇸 A.S | Medium Airport |
| OCS | Corisco International Airport | Corisco Island | 🇬🇶 Guinea Khatulistiwa | Large Airport | |
| OCV | SKOC | Aguas Claras Airport | Ocaña | 🇨🇴 Colombia | Medium Airport |
| OCW | KOCW | Warren Field | Washington | 🇺🇸 A.S | Small Airport |
| ODA | FEFW | Ouadda Airport | Ouadda | 🇨🇫 Republik Afrika Tengah | Small Airport |
| ODB | LEBA | Córdoba Airport | Córdoba | 🇪🇸 Sepanyol | Medium Airport |
| ODC | Oakdale Airport | Oakdale | 🇺🇸 A.S | Small Airport | |
| ODD | YOOD | Oodnadatta Airport | 🇦🇺 Australia | Small Airport | |
| ODE | EKOD | Odense Hans Christian Andersen Airport | Odense | 🇩🇰 Denmark | Large Airport |
| ODH | EGVO | RAF Odiham | Hook, Hampshire | 🇬🇧 UK | Medium Airport |
| ODJ | FEGO | Ouanda Djallé Airport | Ouanda Djallé | 🇨🇫 Republik Afrika Tengah | Small Airport |
| ODL | YCOD | Cordillo Downs Airport | Cordillo Downs | 🇦🇺 Australia | Small Airport |
| ODM | Garrett County Airport | Accident | 🇺🇸 A.S | Small Airport | |
| ODN | WBGI | Long Seridan Airport | Long Seridan | 🇲🇾 Malaysia | Small Airport |
| ODO | UIKB | Bodaybo Airport | Bodaybo | 🇷🇺 Rusia | Small Airport |
| ODR | YORV | Ord River Airport | Ord River | 🇦🇺 Australia | Small Airport |
| ODS | UKOO | Odesa International Airport | Odesa | 🇺🇦 Ukraine | Large Airport |
| ODT | Odessa Schlemeyer Field | Odessa | 🇺🇸 A.S | Small Airport | |
| ODW | KOKH | AJ Eisenberg Airport | Oak Harbor | 🇺🇸 A.S | Small Airport |
| ODY | VLOS | Oudomsay Airport | Oudomsay | 🇱🇦 Laos | Small Airport |
| OEA | O'Neal Airport | Lawrenceville | 🇺🇸 A.S | Small Airport | |
| OEC | WPOC | Oecusse Route of the Sandalwood International Airport | Oecussi-Ambeno | 🇹🇱 Timor-Leste | Large Airport |
| OEM | SMPA | Vincent Fayks Airport | Paloemeu | 🇸🇷 Surinam | Small Airport |
| OEO | KOEO | L O Simenstad Municipal Airport | Osceola | 🇺🇸 A.S | Small Airport |
| OER | ESNO | Örnsköldsvik Airport | Örnsköldsvik | 🇸🇪 Sweden | Medium Airport |
| OES | SAVN | Antoine de Saint Exupéry Airport | San Antonio Oeste | 🇦🇷 Argentina | Small Airport |
| OFF | KOFF | Offutt Air Force Base | Omaha | 🇺🇸 A.S | Medium Airport |
| OFI | DIOF | Ouango Fitini Airport | Ouango Fitini | 🇨🇮 Cote d’Ivoire | Small Airport |
| OFK | KOFK | Karl Stefan Memorial Airport | Norfolk | 🇺🇸 A.S | Medium Airport |
| OFU | NSAS | Ofu Airport | Ofu | 🇦🇸 Samoa Amerika | Small Airport |
| OGA | KOGA | Ogallala Municipal Airport Searle Field | Ogallala | 🇺🇸 A.S | Small Airport |
| OGB | KOGB | Orangeburg Municipal Airport | Orangeburg | 🇺🇸 A.S | Medium Airport |
| OGD | KOGD | Ogden Hinckley Airport | Ogden | 🇺🇸 A.S | Medium Airport |
| OGE | AYOG | Ogeranang Airport | 🇵🇬 Papua New Guinea | Small Airport | |
| OGG | PHOG | Kahului International Airport | Kahului | 🇺🇸 A.S | Large Airport |
| OGL | SYEC | Eugene F. Correia International Airport | Ogle | 🇬🇾 Guyana | Medium Airport |
| OGM | Ogobsucum Airport | Ustupu | 🇵🇦 Panama | Small Airport | |
| OGN | ROYN | Yonaguni Airport | Yonaguni | 🇯🇵 Jepun | Medium Airport |
| OGO | DIAU | Abengourou Airport | Abengourou | 🇨🇮 Cote d’Ivoire | Small Airport |
| OGR | FTTB | Bongor Airport | Bongor | 🇹🇩 Chad | Small Airport |
| OGS | KOGS | Ogdensburg International Airport | Ogdensburg | 🇺🇸 A.S | Medium Airport |
| OGU | LTCB | Ordu–Giresun Airport | Ordu | 🇹🇷 Turkiye | Medium Airport |
| OGX | DAUU | Ain Beida Airport | Ouargla | 🇩🇿 Algeria | Medium Airport |
| OGZ | URMO | Vladikavkaz Beslan International Airport | Beslan | 🇷🇺 Rusia | Medium Airport |
| OHA | NZOH | RNZAF Base Ohakea | 🇳🇿 New Zealand | Medium Airport | |
| OHB | FMFE | Ambohibary Airport | Moramanga | 🇲🇬 Madagaskar | Small Airport |
| OHD | LWOH | Ohrid St. Paul the Apostle Airport | Ohrid | 🇲🇰 Macedonia Utara | Large Airport |
| OHE | ZYMH | Mohe Gulian Airport | Mohe | 🇨🇳 China | Medium Airport |
| OHH | UHSH | Okha Airport | Okha | 🇷🇺 Rusia | Small Airport |
| OHI | FYOS | Oshakati Airport | Oshakati | 🇳🇦 Namibia | Small Airport |
| OHO | UHOO | Okhotsk Airport | Okhotsk | 🇷🇺 Rusia | Medium Airport |
| OHR | EDXY | Wyk auf Föhr Airport | Wyk auf Föhr | 🇩🇪 Jerman | Small Airport |
| OHS | OOSH | Suhar International Airport | Suhar | 🇴🇲 Oman | Large Airport |
| OHT | OPKT | Kohat Airport | Kohat | 🇵🇰 Pakistan | Small Airport |
| OIA | SDOW | Ourilândia do Norte Airport | Ourilândia do Norte | 🇧🇷 Brazil | Small Airport |
| OIC | KOIC | Lt Warren Eaton Airport | Norwich | 🇺🇸 A.S | Small Airport |
| OIM | RJTO | Oshima Airport | Izu Oshima | 🇯🇵 Jepun | Medium Airport |
| OIR | RJEO | Okushiri Airport | Okushiri Island | 🇯🇵 Jepun | Medium Airport |
| OIT | RJFO | Oita Airport | Oita | 🇯🇵 Jepun | Medium Airport |
| OJC | KOJC | Johnson County Executive Airport | Olathe | 🇺🇸 A.S | Small Airport |
| OJU | WAFU | Tanjung Api Airport | Tojo Una-Una | 🇮🇩 Indonesia | Small Airport |
| OKA | ROAH | Naha International Airport | Naha | 🇯🇵 Jepun | Large Airport |
| OKB | YORC | Orchid Beach Airport | Orchid Beach | 🇦🇺 Australia | Small Airport |
| OKC | KOKC | OKC Will Rogers World Airport | Oklahoma City | 🇺🇸 A.S | Large Airport |
| OKD | RJCO | Sapporo Okadama Airport | Sapporo | 🇯🇵 Jepun | Medium Airport |
| OKE | RJKB | Okinoerabu Airport | Wadomari | 🇯🇵 Jepun | Medium Airport |
| OKF | FYOO | Okaukuejo Airport | Okaukuejo | 🇳🇦 Namibia | Small Airport |
| OKG | Okoyo Airport | Okoyo | 🇨🇬 Congo - Brazzaville | Small Airport | |
| OKI | RJNO | Oki Global Geopark Airport | Okinoshima | 🇯🇵 Jepun | Medium Airport |
| OKJ | RJOB | Okayama Momotaro Airport | Okayama | 🇯🇵 Jepun | Large Airport |
| OKK | KOKK | Kokomo Municipal Airport | Kokomo | 🇺🇸 A.S | Small Airport |
| OKL | WAJO | Oksibil Airport | Oksibil | 🇮🇩 Indonesia | Medium Airport |
| OKM | KOKM | Okmulgee Regional Airport | Okmulgee | 🇺🇸 A.S | Small Airport |
| OKN | FOGQ | Okondja Airport | Okondja | 🇬🇦 Gabon | Medium Airport |
| OKO | RJTY | Yokota Air Base | Fussa | 🇯🇵 Jepun | Medium Airport |
| OKP | AYOJ | Oksapmin Airport | Oksapmin | 🇵🇬 Papua New Guinea | Small Airport |
| OKQ | WAKO | Okaba Airport | Okaba | 🇮🇩 Indonesia | Small Airport |
| OKR | YYKI | Yorke Island Airport | Yorke Island | 🇦🇺 Australia | Small Airport |
| OKS | KOKS | Garden County Airport/King Rhiley Field | Oshkosh | 🇺🇸 A.S | Small Airport |
| OKT | UWUK | Oktyabrskiy Airport | Kzyl-Yar | 🇷🇺 Rusia | Small Airport |
| OKU | FYMO | Mokuti Lodge Airport | Mokuti Lodge | 🇳🇦 Namibia | Small Airport |
| OKV | AYOF | Okao Airport | Okao | 🇵🇬 Papua New Guinea | Small Airport |
| OKY | YBOK | Oakey Army Aviation Centre | 🇦🇺 Australia | Medium Airport | |
| OLA | ENOL | Ørland Airport | Ørland | 🇳🇴 Norway | Medium Airport |
| OLB | LIEO | Olbia Costa Smeralda Airport | Olbia (SS) | 🇮🇹 Itali | Large Airport |
| OLC | SDCG | Senadora Eunice Micheles Airport | São Paulo De Olivença | 🇧🇷 Brazil | Small Airport |
| OLD | KOLD | Dewitt Field - Old Town Municipal Airport | Old Town | 🇺🇸 A.S | Small Airport |
| OLE | KOLE | Cattaraugus County-Olean Airport | Olean | 🇺🇸 A.S | Small Airport |
| OLF | KOLF | L M Clayton Airport | Wolf Point | 🇺🇸 A.S | Medium Airport |
| OLG | Olare Orok Airfield | Mara | 🇰🇪 Kenya | Small Airport | |
| OLH | Old Harbor Airport | Old Harbor | 🇺🇸 A.S | Small Airport | |
| OLI | BIRF | Rif Airport | Rif | 🇮🇸 Iceland | Small Airport |
| OLJ | NVSZ | North West Santo Airport | Olpoi | 🇻🇺 Vanuatu | Small Airport |
| OLK | SGOL | Aeródromo de Fuerte | Fuerte Olimpo | 🇵🇾 Paraguay | Small Airport |
| OLL | FCOD | Oyo Ollombo Airport | Oyo | 🇨🇬 Congo - Brazzaville | Medium Airport |
| OLM | KOLM | Olympia Regional Airport | Olympia | 🇺🇸 A.S | Medium Airport |
| OLN | SAVM | Lago Musters Airport | Sarmiento | 🇦🇷 Argentina | Small Airport |
| OLO | LKOL | Olomouc Airport | Olomouc | 🇨🇿 Czechia | Small Airport |
| OLP | YOLD | Olympic Dam Airport | Olympic Dam | 🇦🇺 Australia | Small Airport |
| OLQ | AYOV | Olsobip Airport | Olsobip | 🇵🇬 Papua New Guinea | Small Airport |
| OLR | OASL | Salerno Airport | Khost | 🇦🇫 Afghanistan | Small Airport |
| OLS | KOLS | Nogales International Airport | Nogales | 🇺🇸 A.S | Medium Airport |
| OLU | KOLU | Columbus Municipal Airport | Columbus | 🇺🇸 A.S | Medium Airport |
| OLV | KOLV | Olive Branch Airport | Olive Branch | 🇺🇸 A.S | Small Airport |
| OLX | HKOK | Mara-Olkiombo Airport | Serena | 🇰🇪 Kenya | Small Airport |
| OLY | KOLY | Olney Noble Airport | Olney-Noble | 🇺🇸 A.S | Small Airport |
| OLZ | UEMO | Olyokminsk Airport | Olyokminsk | 🇷🇺 Rusia | Medium Airport |
| OMA | KOMA | Eppley Airfield | Omaha | 🇺🇸 A.S | Large Airport |
| OMB | FOOH | Omboue Hospital Airport | Omboue | 🇬🇦 Gabon | Medium Airport |
| OMC | RPVO | Ormoc Airport | Ormoc City | 🇵🇭 Filipina | Medium Airport |
| OMD | FYOG | Oranjemund Airport | Oranjemund | 🇳🇦 Namibia | Medium Airport |
| OME | PAOM | Nome Airport | Nome | 🇺🇸 A.S | Medium Airport |
| OMF | OJMF | King Hussein Air College | Mafraq | 🇯🇴 Jordan | Small Airport |
| OMG | FYOE | Omega Airport | Omega | 🇳🇦 Namibia | Small Airport |
| OMH | OITR | Urmia Airport | Urmia | 🇮🇷 Iran | Medium Airport |
| OMI | OIAJ | Omidiyeh Airport | Omidiyeh | 🇮🇷 Iran | Small Airport |
| OMJ | RJDU | JMSDF Omura Air Base | Nagasaki | 🇯🇵 Jepun | Small Airport |
| OMK | KOMK | Omak Airport | Omak | 🇺🇸 A.S | Small Airport |
| OMM | OOMX | Marmul Airport | Marmul | 🇴🇲 Oman | Small Airport |
| OMN | UZTZ | Zomin Airport | Zomin | 🇺🇿 Uzbekistan | Medium Airport |
| OMO | LQMO | Mostar International Airport | Mostar | 🇧🇦 Bosnia dan Herzegovina | Large Airport |
| OMR | LROD | Oradea International Airport | Oradea | 🇷🇴 Romania | Large Airport |
| OMS | UNOO | Omsk Central Airport | Omsk | 🇷🇺 Rusia | Large Airport |
| OMY | Preah Vinhear Airport | Tbeng Meanchey | 🇰🇭 Kemboja | Small Airport | |
| ONA | KONA | Winona Municipal Airport Max Conrad Field | Winona | 🇺🇸 A.S | Small Airport |
| ONB | AYQQ | Ononge Airport | Onange Mission | 🇵🇬 Papua New Guinea | Small Airport |
| OND | FYOA | Ondangwa Airport | Ondangwa | 🇳🇦 Namibia | Medium Airport |
| ONG | YMTI | Mornington Island Airport | 🇦🇺 Australia | Small Airport | |
| ONH | Albert S Nader Regional Airport | Oneonta | 🇺🇸 A.S | Small Airport | |
| ONI | WABD | Moanamani Airport | Moanamani | 🇮🇩 Indonesia | Small Airport |
| ONJ | RJSR | Odate Noshiro Airport | Kitaakita | 🇯🇵 Jepun | Medium Airport |
| ONK | UERO | Olenyok Airport | Olenyok | 🇷🇺 Rusia | Small Airport |
| ONL | KONL | O'Neill Municipal Airport–John L Baker Field | O'Neill | 🇺🇸 A.S | Small Airport |
| ONM | KONM | Socorro Municipal Airport | Socorro | 🇺🇸 A.S | Small Airport |
| ONO | KONO | Ontario Municipal Airport | Oregon | 🇺🇸 A.S | Medium Airport |
| ONP | KONP | Newport Municipal Airport | Newport | 🇺🇸 A.S | Medium Airport |
| ONQ | LTAS | Zonguldak Çaycuma Airport | Zonguldak | 🇹🇷 Turkiye | Medium Airport |
| ONR | YMNK | Monkira Airport | 🇦🇺 Australia | Small Airport | |
| ONS | YOLW | Onslow Airport | 🇦🇺 Australia | Small Airport | |
| ONT | KONT | Ontario International Airport | Ontario | 🇺🇸 A.S | Large Airport |
| ONU | NFOL | Ono-i-Lau Airport | Ono-i-Lau | 🇫🇯 Fiji | Small Airport |
| ONX | MPEJ | Enrique Adolfo Jimenez Airport | Colón | 🇵🇦 Panama | Medium Airport |
| ONY | KONY | Olney Municipal Airport | Olney | 🇺🇸 A.S | Small Airport |
| OOA | KOOA | Oskaloosa Municipal Airport | Cedar | 🇺🇸 A.S | Small Airport |
| OOD | Koodaideri Mine Airport | Koodaideri Mine | 🇦🇺 Australia | Small Airport | |
| OOK | PAOO | Toksook Bay Airport | Toksook Bay | 🇺🇸 A.S | Small Airport |
| OOL | YBCG | Gold Coast Airport | Gold Coast | 🇦🇺 Australia | Large Airport |
| OOM | YCOM | Cooma Snowy Mountains Airport | Cooma | 🇦🇺 Australia | Medium Airport |
| OOR | YMOO | Mooraberree Airport | 🇦🇺 Australia | Small Airport | |
| OOT | NGON | Onotoa Airport | Onotoa | 🇰🇮 Kiribati | Small Airport |
| OPA | BIKP | Kópasker Airport | Kópasker | 🇮🇸 Iceland | Small Airport |
| OPB | Open Bay Airport | Maitanakunai | 🇵🇬 Papua New Guinea | Small Airport | |
| OPF | KOPF | Miami-Opa Locka Executive Airport | Miami | 🇺🇸 A.S | Medium Airport |
| OPI | YOEN | Oenpelli Airport | 🇦🇺 Australia | Small Airport | |
| OPL | KOPL | St Landry Parish Ahart Field | Opelousas | 🇺🇸 A.S | Small Airport |
| OPO | LPPR | Francisco de Sá Carneiro Airport | Porto | 🇵🇹 Portugal | Large Airport |
| OPP | Salinópolis Airport | Salinópolis | 🇧🇷 Brazil | Small Airport | |
| OPS | SBSI | Presidente João Batista Figueiredo Airport | Sinop | 🇧🇷 Brazil | Small Airport |
| OPU | AYBM | Balimo Airport | Balimo | 🇵🇬 Papua New Guinea | Medium Airport |
| OPW | FYOP | Opuwa Airport | Opuwa | 🇳🇦 Namibia | Small Airport |
| OQN | Kokand Airport | Kokand | 🇺🇿 Uzbekistan | Small Airport | |
| ORA | SASO | Orán Airport | Orán | 🇦🇷 Argentina | Medium Airport |
| ORB | ESOE | Örebro Airport | Örebro | 🇸🇪 Sweden | Medium Airport |
| ORC | SKOE | Orocue Airport | Orocue | 🇨🇴 Colombia | Small Airport |
| ORD | KORD | Chicago O'Hare International Airport | Chicago | 🇺🇸 A.S | Large Airport |
| ORE | LFOZ | Orléans–Saint-Denis-de-l'Hôtel Airport | Saint-Denis-de-l'Hôtel, Loiret | 🇫🇷 Perancis | Small Airport |
| ORF | KORF | Norfolk International Airport | Norfolk | 🇺🇸 A.S | Large Airport |
| ORG | SMZO | Zorg en Hoop Airport | Paramaribo | 🇸🇷 Surinam | Small Airport |
| ORH | KORH | Worcester Regional Airport | Worcester | 🇺🇸 A.S | Medium Airport |
| ORI | Port Lions Airport | Port Lions | 🇺🇸 A.S | Small Airport | |
| ORJ | SYOR | Orinduik Airport | Orinduik | 🇬🇾 Guyana | Small Airport |
| ORK | EICK | Cork International Airport | Cork | 🇮🇪 Ireland | Large Airport |
| ORL | KORL | Orlando Executive Airport | Orlando | 🇺🇸 A.S | Medium Airport |
| ORM | EGBK | Sywell Aerodrome | Northampton, Northamptonshire | 🇬🇧 UK | Small Airport |
| ORN | DAOO | Oran Es-Sénia (Ahmed Ben Bella) International Airport | Es-Sénia | 🇩🇿 Algeria | Large Airport |
| ORO | MHYR | Yoro Airport | Yoro | 🇭🇳 Honduras | Small Airport |
| ORP | FBOR | Orapa Airport | Orapa | 🇧🇼 Botswana | Small Airport |
| ORR | YYOR | Yorketown Airport | 🇦🇺 Australia | Small Airport | |
| ORT | PAOR | Northway Airport | Northway | 🇺🇸 A.S | Medium Airport |
| ORU | SLOR | Juan Mendoza International Airport | Oruro | 🇧🇴 Bolivia | Large Airport |
| ORV | PFNO | Robert (Bob) Curtis Memorial Airport | Noorvik | 🇺🇸 A.S | Small Airport |
| ORW | OPOR | Ormara Airport | Ormara Raik | 🇵🇰 Pakistan | Small Airport |
| ORX | SNOX | Oriximiná Airport | Oriximiná | 🇧🇷 Brazil | Small Airport |
| ORY | LFPO | Paris-Orly Airport | Paris (Orly, Val-de-Marne) | 🇫🇷 Perancis | Large Airport |
| ORZ | H.E Alfredo Martinez (Tower Hill) Airstrip | Orange Walk | 🇧🇿 Belize | Small Airport | |
| OSB | Grand Glaize Osage Beach Airport | Osage Beach | 🇺🇸 A.S | Small Airport | |
| OSC | KOSC | Oscoda Wurtsmith Airport | Oscoda | 🇺🇸 A.S | Small Airport |
| OSD | ESNZ | Åre Östersund Airport | Östersund | 🇸🇪 Sweden | Medium Airport |
| OSE | AYOM | Omora Airport | Omora | 🇵🇬 Papua New Guinea | Small Airport |
| OSG | AYZS | Ossima Airport | Ossima | 🇵🇬 Papua New Guinea | Small Airport |
| OSH | KOSH | Wittman Regional Airport | Oshkosh | 🇺🇸 A.S | Medium Airport |
| OSI | LDOS | Osijek Airport | Osijek(Klisa) | 🇭🇷 Croatia | Medium Airport |
| OSJ | HKOY | Ol Seki Naboisho Airstrip | Mara Simba | 🇰🇪 Kenya | Small Airport |
| OSK | ESMO | Oskarshamn Airport | Oskarshamn | 🇸🇪 Sweden | Small Airport |
| OSL | ENGM | Oslo-Gardermoen International Airport | Oslo (Gardermoen) | 🇳🇴 Norway | Large Airport |
| OSM | ORBM | Mosul International Airport | Mosul | 🇮🇶 Iraq | Large Airport |
| OSN | RKSO | Osan Air Base | Pyeongtaek | 🇰🇷 Korea Selatan | Medium Airport |
| OSO | YOSB | Osborne Mine Airport | 🇦🇺 Australia | Small Airport | |
| OSR | LKMT | Leoš Janáček Airport Ostrava | Mošnov | 🇨🇿 Czechia | Large Airport |
| OSS | UCFO | Osh International Airport | Osh | 🇰🇬 Kyrgyzstan | Large Airport |
| OST | EBOS | Ostend-Bruges International Airport | Oostende | 🇧🇪 Belgium | Large Airport |
| OSU | KOSU | The Ohio State University Airport - Don Scott Field | Columbus | 🇺🇸 A.S | Medium Airport |
| OSW | UWOR | Orsk Airport | Orsk | 🇷🇺 Rusia | Medium Airport |
| OSX | KOSX | Kosciusko Attala County Airport | Kosciusko | 🇺🇸 A.S | Small Airport |
| OSY | ENNM | Namsos Airport | Namsos | 🇳🇴 Norway | Small Airport |
| OTC | FTTL | Bol-Berim Airport | Bol | 🇹🇩 Chad | Small Airport |
| OTD | Raul Arias Espinoza Airport | Contadora Island | 🇵🇦 Panama | Small Airport | |
| OTG | KOTG | Worthington Municipal Airport | Worthington | 🇺🇸 A.S | Small Airport |
| OTH | KOTH | Southwest Oregon Regional Airport | North Bend | 🇺🇸 A.S | Medium Airport |
| OTI | Pitu Airport | Gotalalamo-Morotai Island | 🇮🇩 Indonesia | Medium Airport | |
| OTJ | FYOW | Otjiwarongo Airport | Otjiwarongo | 🇳🇦 Namibia | Small Airport |
| OTK | KTMK | Tillamook Airport | Tillamook | 🇺🇸 A.S | Small Airport |
| OTL | GQNB | Boutilimit Airport | Boutilimit | 🇲🇷 Mauritania | Small Airport |
| OTM | KOTM | Ottumwa Regional Airport | Ottumwa | 🇺🇸 A.S | Medium Airport |
| OTN | Ed-Air Airport | Oaktown | 🇺🇸 A.S | Small Airport | |
| OTO | Otog Banner Wulan Airport | Wulan | 🇨🇳 China | Small Airport | |
| OTP | LROP | Bucharest Henri Coandă International Airport | Otopeni | 🇷🇴 Romania | Large Airport |
| OTQ | Otog Front Banner Oljoq Airport | Otog Front Banner | 🇨🇳 China | Small Airport | |
| OTR | MRCC | Coto 47 Airport | Corredores | 🇨🇷 Costa Rica | Medium Airport |
| OTS | Anacortes Airport | Anacortes | 🇺🇸 A.S | Small Airport | |
| OTT | Andre Maggi Airport | Cotriguaçu | 🇧🇷 Brazil | Small Airport | |
| OTU | SKOT | Otu Airport | Remedios | 🇨🇴 Colombia | Small Airport |
| OTZ | PAOT | Ralph Wien Memorial Airport | Kotzebue | 🇺🇸 A.S | Medium Airport |
| OUA | DFFD | Ouagadougou Thomas Sankara International Airport | Ouagadougou | 🇧🇫 Burkina Faso | Large Airport |
| OUD | GMFO | Oujda Angads Airport | Ahl Angad | 🇲🇦 Maghribi | Large Airport |
| OUE | FCOU | Ouesso Airport | 🇨🇬 Congo - Brazzaville | Medium Airport | |
| OUG | DFCC | Ouahigouya Airport | Ouahigouya | 🇧🇫 Burkina Faso | Small Airport |
| OUH | FAOH | Oudtshoorn Airport | Oudtshoorn | 🇿🇦 Afrika Selatan | Medium Airport |
| OUI | LFEC | Ouessant Airport | Ushant | 🇫🇷 Perancis | Small Airport |
| OUL | EFOU | Oulu Airport | Oulu / Oulunsalo | 🇫🇮 Finland | Large Airport |
| OUM | Oum Hadjer Airport | Oum Hadjer | 🇹🇩 Chad | Small Airport | |
| OUN | KOUN | University of Oklahoma Westheimer Airport | Norman | 🇺🇸 A.S | Small Airport |
| OUR | FKKI | Batouri Airport | Batouri | 🇨🇲 Cameroon | Small Airport |
| OUS | SDOU | Jornalista Benedito Pimentel Airport | Ourinhos | 🇧🇷 Brazil | Small Airport |
| OUT | FTTS | Bousso Airport | Bousso | 🇹🇩 Chad | Small Airport |
| OUZ | GQPZ | Tazadit Airport | Zouérate | 🇲🇷 Mauritania | Medium Airport |
| OVA | FMSL | Bekily Airport | Bekily | 🇲🇬 Madagaskar | Small Airport |
| OVB | UNNT | Novosibirsk Tolmachevo Airport | Novosibirsk | 🇷🇺 Rusia | Large Airport |
| OVD | LEAS | Asturias Airport | Ranón | 🇪🇸 Sepanyol | Large Airport |
| OVE | KOVE | Oroville Municipal Airport | Oroville | 🇺🇸 A.S | Small Airport |
| OVG | FAOB | Overberg Airport | Overberg | 🇿🇦 Afrika Selatan | Small Airport |
| OVL | SCOV | El Tuqui Airport | Ovalle | 🇨🇱 Chile | Small Airport |
| OVR | SAZF | Olavarria Airport | Olavarria | 🇦🇷 Argentina | Small Airport |
| OVS | USHS | Sovetskiy Airport | Sovetskiy | 🇷🇺 Rusia | Medium Airport |
| OWA | KOWA | Owatonna Degner Regional Airport | Owatonna | 🇺🇸 A.S | Small Airport |
| OWB | KOWB | Owensboro Daviess County Airport | Owensboro | 🇺🇸 A.S | Medium Airport |
| OWD | KOWD | Norwood Memorial Airport | Norwood | 🇺🇸 A.S | Medium Airport |
| OWK | KOWK | Central Maine/Norridgewock Airport | Norridgewock | 🇺🇸 A.S | Small Airport |
| OXB | GGOV | Osvaldo Vieira International Airport | Bissau | 🇬🇼 Guinea Bissau | Large Airport |
| OXC | KOXC | Waterbury Oxford Airport | Oxford | 🇺🇸 A.S | Small Airport |
| OXD | KOXD | Miami University Airport | Oxford | 🇺🇸 A.S | Small Airport |
| OXF | EGTK | London Oxford Airport | Kidlington, Oxfordshire | 🇬🇧 UK | Medium Airport |
| OXO | Orientos Airport | Orientos | 🇦🇺 Australia | Small Airport | |
| OXR | KOXR | Oxnard Airport | Oxnard | 🇺🇸 A.S | Medium Airport |
| OXY | YMNY | Morney Airport | 🇦🇺 Australia | Small Airport | |
| OYA | SATG | Goya Airport | Goya | 🇦🇷 Argentina | Medium Airport |
| OYC | Camopi Airport | Camopi | 🇬🇫 Guiana Perancis | Small Airport | |
| OYE | FOGO | Oyem Airport | Oyem | 🇬🇦 Gabon | Medium Airport |
| OYG | Moyo Airport | Moyo | 🇺🇬 Uganda | Small Airport | |
| OYK | SBOI | Oiapoque Airport | Oiapoque | 🇧🇷 Brazil | Medium Airport |
| OYL | HKMY | Moyale Airport | Moyale | 🇰🇪 Kenya | Small Airport |
| OYN | YOUY | Ouyen Airport | Ouyen | 🇦🇺 Australia | Small Airport |
| OYO | SAZH | Tres Arroyos Airport | Tres Arroyos | 🇦🇷 Argentina | Medium Airport |
| OYP | SOOG | Saint-Georges-de-l'Oyapock Airport | Saint-Georges-de-l'Oyapock | 🇬🇫 Guiana Perancis | Medium Airport |
| OZA | KOZA | Ozona Municipal Airport | Ozona | 🇺🇸 A.S | Small Airport |
| OZC | RPMO | Labo Airport | Ozamiz | 🇵🇭 Filipina | Medium Airport |
| OZG | GMAZ | Zagora Airport | Zagora | 🇲🇦 Maghribi | Large Airport |
| OZH | UKDE | Zaporizhzhia International Airport | Zaporizhia | 🇺🇦 Ukraine | Large Airport |
| OZP | LEMO | Moron Air Base | Morón | 🇪🇸 Sepanyol | Medium Airport |
| OZR | KOZR | Cairns AAF (Fort Rucker) Air Field | Fort Rucker/Ozark | 🇺🇸 A.S | Medium Airport |
| OZZ | GMMZ | Ouarzazate International Airport | Ouarzazate | 🇲🇦 Maghribi | Large Airport |