Air-Port-CodesView airports by countryTotal Airports Found: 187
- O'Hare International Airport (ORD)
- O'Neal Airport (OEA)
- O'Sullivan Army Heliport (CSL)
- O. R. Tambo International Airport (JNB)
- Oakdale Airport (ODC)
- Oakdale Airport (O27)
- Oakey Army Aviation Centre (OKY)
- Oakland Convention Center Heliport (JCE)
- Oakland County International Airport (PTK)
- Oakland International Airport (OAK)
- Oakley Municipal Airport (OEL)
- Oamaru Airport (OAM)
- Oban Airport (OBN)
- Obando Airport (PDA)
- Oberpfaffenhofen Airport (OBF)
- Óbidos Airport (OBI)
- Obo Airport (OBX)
- Obock Airport (OBC)
- Obre Lake/North of Sixty Airport (YDW)
- Ocala International Airport (OCF)
- Ocean City Municipal Airport (OCE)
- Ocean Reef Club Airport (OCA)
- Ocean Ridge Airport (E55)
- Oceanside Municipal Airport (OCN)
- Oconee County Regional Airport (CEU)
- Odate-Noshiro Airport (ONJ)
- Odell Williamson Municipal Airport (60J)
- Odessa International Airport (ODS)
- Odienné Airport (KEO)
- Oecussi Airport (OEC)
- Oenpelli Airport (OPI)
- Offutt Air Force Base (OFF)
- Ofu Airport (OFU)
- Ogden-Hinckley Airport (OGD)
- Ogdensburg International Airport (OGS)
- Ogoki Post Airport (YOG)
- Ohio State University Airport (OSU)
- Ohkay Owingeh Airport (ESO)
- Ohrid "St. Paul the Apostle" Airport (OHD)
- Oiapoque Airport (OYK)
- Oita Airport (OIT)
- Okaba Airport (OKQ)
- Okadama Airport (OKD)
- Okaukuejo Airport (OKF)
- Okayama Airport (OKJ)
- Okeechobee County Airport (OBE)
- Okha Airport (OHH)
- Okhotsk Airport (OHO)
- Oki Airport (OKI)
- Okinoerabu Airport (OKE)
- Okmulgee Regional Airport (OKM)
- Okondja Airport (OKN)
- Okoyo Airport (OKG)
- Oksibil Airport (OKL)
- Oktyabrskiy Airport (OKT)
- Okushiri Airport (OIR)
- Ólafsfjörður Airport (OFJ)
- Olavarria Airport (OVR)
- Olaya Herrera Airport (EOH)
- Olbia-Costa Smeralda Airport (OLB)
- Old Crow Airport (YOC)
- Old Harbor Airport (OLH)
- Old Town Municipal Airport and Seaplane Base (OLD)
- Olga Bay Seaplane Base (KOY)
- Ölgii Airport (ULG)
- Olive Branch Airport (OLV)
- Olivia Regional Airport (OVL)
- Olney Municipal Airport (ONY)
- Olney-Noble Airport (OLY)
- Olpoi Airport (OLJ)
- Olympia Regional Airport (OLM)
- Olympic Dam Airport (OLP)
- Omak Airport (OMK)
- Omar N. Bradley Airport (MBY)
- Omboué Hospital Airport (OMB)
- Omega Airport (OMG)
- Omidiyeh Air Base (OMI)
- Omsk Tsentralny Airport (OMS)
- Ondangwa Airport (OND)
- Ondjiva Pereira Airport (VPE)
- Oneonta Municipal Airport (ONH)
- Ono-I-Lau Airport (ONU)
- Ononge Airport (ONB)
- Onotoa Airport (OOT)
- Onslow Airport (ONS)
- Ontario International Airport (ONT)
- Ontario International Heliport (JIO)
- Ontario Municipal Airport (ONO)
- Oodnadatta Airport (ODD)
- Oostmalle Airfield (OBL)
- Opinaca Aerodrome (YOI)
- Oradea International Airport (OMR)
- Oral Ak Zhol Airport (URA)
- Oran Airport (ORA)
- Oran Tafraoui Airport (TAF)
- Orange City Municipal Airport (ORC)
- Orange County Airport (MGJ)
- Orange Regional Airport (OAG)
- Orange Walk Airport (ORZ)
- Orange-Caritat Air Base (XOG)
- Orangeburg Municipal Airport (OGB)
- Oranjemund Airport (OMD)
- Orapa Airport (ORP)
- Orbost Airport (RBS)
- Orcas Island Airport (ESD)
- Orchid Beach Airport (OKB)
- Ord River Airport (ODR)
- Ordos Ejin Horo Airport (DSN)
- Örebro Airport (ORB)
- Orenburg Tsentralny Airport (REN)
- Orestes Acosta Airport (MOA)
- Orinduik Airport (ORJ)
- Oristano-Fenosu Airport (FNU)
- Oriximiná Airport (ORX)
- Orlando Executive Airport (ORL)
- Orlando International Airport (MCO)
- Orlando Sanford International Airport (SFB)
- Orlando Villas-Bôas Regional Airport (MBK)
- Orléans – Bricy Air Base (ORE)
- Ormara Airport (ORW)
- Ormoc Airport (OMC)
- Örnsköldsvik Airport (OER)
- Oro Negro Airport (CBS)
- Oroville Municipal Airport (OVE)
- Orsk Airport (OSW)
- Ortonville Municipal Airport (VVV)
- Osaka - All Airports (OSA)
- Osaka International Airport (ITM)
- Osan Air Base (OSN)
- Osborne Mine Airport (OSO)
- Oschersleben Airport (FRF)
- Oscoda-Wurtsmith Airport (OSC)
- Osh International Airport (OSS)
- Oshawa Executive Airport (YOO)
- Oshima Airport (OIM)
- Osijek Airport (OSI)
- Oskaloosa Municipal Airport (OOA)
- Oskarshamn Airport (OSK)
- Oskemen Airport (UKK)
- Oslo Airport, Gardermoen (OSL)
- Oslo Central Station (XZO)
- Osmanabad Airport (OMN)
- Osmani International Airport (ZYL)
- Ostend-Bruges International Airport (OST)
- Ostrava-Mošnov International Airport (OSR)
- Osvaldo Vieira International Airport (OXB)
- Oswaldo Guevara Mujica Airport (AGV)
- Otis Air National Guard Base (FMH)
- Ottawa / Rockcliffe Seaplane Base (TR7)
- Ottawa Train Station (XDS)
- Ottawa/Carp Airport (YRP)
- Ottawa/Macdonald-Cartier International Airport (YOW)
- Ottawa/Rockcliffe Airport (YRO)
- Ottumwa Regional Airport (OTM)
- Otú Airport (OTU)
- Ouadda Airport (ODA)
- Ouagadougou International Airport (OUA)
- Ouahigouya Airport (OUG)
- Ouanaham Airport (LIF)
- Ouanda Djallé Airport (ODJ)
- Ouango Fitini Airport (OFI)
- Ouani Airport (AJN)
- Ouarzazate Airport (OZZ)
- Oudomsay Airport (ODY)
- Oudtshoorn Airport (OUH)
- Oudtshoorn Airport (DUH)
- Oued Irara–Krim Belkacem Airport (HME)
- Ouesso Airport (OUE)
- Oujda Angads Airport (OUD)
- Oulu Airport (OUL)
- Oum Hadjer Airport (OUM)
- Ourilândia do Norte Airport (OIA)
- Ourinhos Airport (OUS)
- Ouro Sogui Airport (MAX)
- Ouvéa Airport (UVE)
- Ouyen Airport (OYN)
- Ouzinkie Airport (KOZ)
- Ovda Airport (VDA)
- Owando Airport (FTX)
- Owatonna Degner Regional Airport (OWA)
- Owen Roberts International Airport (GCM)
- Owen Sound/Billy Bishop Regional Airport (YOS)
- Owensboro–Daviess County Regional Airport (OWB)
- Oxford House Airport (YOH)
- Oxnard Airport (OXR)
- Oyem Airport (OYE)
- Ozona Municipal Airport (OZA)