Earth Continents Countries International Codes
International Airlines and Airports IATA 3-letter codes 
IATA 3-letter List of Codes - O 
) open the official website of an airport. The airport websites typically offer information about the airport's facilities, passenger amenities, current weather conditions, real-time flight status information of arrivals and departures, and the destinations you can fly to from this airport, as well as a list of Airline Companies which serve the airport.
| Oakland (CA) | Oakland International Airport |
USA | OAK |
| Oaxaca de Juárez | Xoxocotlán International Airport | Mexico | OAX |
| Odense | Hans Christian Andersen Airport |
Denmark | ODE |
| Odessa | Odessa International Airport |
Ukraine | ODS |
| Örebro (Oerebro) | Örebro Airport | Sweden | ORB |
| Ohrid | Ohrid Airport | Macedonia | OHD |
| Oita | Oita Airport | Kyushu, Japan | OIT |
| Okayama | Okayama Airport |
Chūgoku, Japan | OKJ |
| Oklahoma City (OK) | Will Rogers World Airport |
USA | OKC |
| Olbia | Olbia Costa Smeralda Airport |
Sardinia, Italy | OLB |
| Olympic Dam | Olympic Dam Airport | SA, Australia | OLP |
| Omaha (NE) | Eppley Airfield |
USA | OMA |
| Ondangwa | Ondangwa Airport | Namibia | OND |
| Ontario (CA) | Ontario International Airport | USA | ONT |
| Oran (Ouahran) | Oran Es Sénia Airport |
Algeria | ORN |
| Orange | Orange Airport | NSW, Australia | OAG |
| Orange County (Santa Ana) (CA) | John Wayne Airport |
USA | SNA |
| Oranjemund | Oranjemund Airport | Karas, Namibia | OMD |
| Oranjestad | Reina Beatrix International |
Aruba | AUA |
| Orkney (islands) | Kirkwall Airport | United Kingdom | KOI |
| Orlando (FL) | Metropolitan Area | USA | ORL |
| Orlando (FL) | Orlando International Airport |
USA | MCO |
| Orpheus Island | Waterport Airport | Queensland, Australia | ORS |
| Osaka | Metropolitan Area | Japan | OSA |
| Osaka | Osaka International Airport (Itami) |
Japan | ITM |
| Osaka | Kansai International Airport |
Japan | KIX |
| Oshkosh (WI) | Wittman Regional Airport | USA | OSH |
| Osijek | Osijek Airport | Croatia (Hrvatska) | OSI |
| Oslo (capital city) | Oslo Airport, Gardermoen |
Norway | OSL |
| Oslo | Fornebu Airport (closed) replaced by Oslo Airport Gardermoen | Norway | FBU |
| Oslo | Sandefjord Airport, Torp |
Norway | TRF |
| Ottawa (capital city) | Macdonald-Cartier International Airport |
Ontario, Canada | YOW |
| Ouadda | Ouadda Airport | Central African Republic | ODA |
| Ouarzazate | Ouarzazate Airport | Morocco | OZZ |
| Oudtshoorn | Oudtshoorn Airport | Western Cape, South Africa | OUH |
| Ouagadougou (capital city) | Ouagadougou International Airport |
Burkina Faso | OUA |
| Oujda | Angads Airport | Morocco | OUD |
| Oulu | Oulu Airport | Finland | OUL |
| Out Skerries (Shetland) | Out Skerries | United Kingdom | OUK |
| Ouvea | Ouloup Airport | New Caledonia | UVE |
| Oviedo | Asturias Airport (Oviedo Airport) | Spain | OVD |
| Owensboro (KY) | Owensboro-Daviess County Airport | USA | OWB |
| Oxnard (CA) | Oxnard Airport | USA | OXR |
| Oyem | Oyem Airport | Gabon | OYE |
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IATA,
the International Air Transport Association