International airports, regional fields and GA aerodromes — the places every mission starts and ends.

| Company | Type | Location | Codes |
|---|---|---|---|
| Onyon Airport | aerodrome | United States | — |
| Oodnadatta Airport | international | Australia | IATA ODD · ICAO YOOD |
| Ooldea Airport | aerodrome | Australia | — |
| Oolenoy Valley Airport | aerodrome | United States | — |
| Oologah Airport | aerodrome | United States | — |
| Oomrang Air (Private) | aerodrome | United States | — |
| Ooratippra Airport | aerodrome | Australia | — |
| Oostwold Airport | aerodrome | Oostwold, Netherlands | ICAO EHOW |
| Ootann Airport | aerodrome | Australia | ICAO YOTN |
| Ootmoed Airfield | aerodrome | Namibia | ICAO FYOT |
| Opala | aerodrome | Congo - Kinshasa | — |
| Opapimiskan Lake Airport | international |
aerodrome 30,878international 8,351military airfield 1,867private airstrip 1,800heliport 555regional 460
United States 15,232Brazil 2,982Australia 2,025Canada 1,765France 1,355Russia 1,265United Kingdom 1,109South Africa 938Germany 879Colombia 835Italy 718Indonesia 681Argentina 621Ukraine 570Papua New Guinea 536China 489Mexico 478Venezuela 468Spain 414India 411Namibia 376Chile 358Congo - Kinshasa 356South Sudan 331Poland 327Czechia 277New Zealand 250Kenya 242Sweden 222Japan 195Philippines 188Norway 179Botswana 151Portugal
Operators claiming an entry can correct facts, add services and certificates, and mark their page verified. Claiming is free — see a company’s page for the claim link.
| Canada |
| IATA YBS |
| Opava | aerodrome | Czechia | — |
| Opava - Kylešovice Airstrip | aerodrome | Czechia | — |
| Open A-1 Ranch Airport | aerodrome | United States | — |
| Open Bay Airport | international | Papua New Guinea | IATA OPB · ICAO AYOY |
| Operet Airport | aerodrome | Namibia | ICAO FYOU |
| Opheim Airport | aerodrome | United States | — |
| Ophir Airport | aerodrome | United States | — |
| Opienge | aerodrome | Congo - Kinshasa | — |
| Ōpiki Airstrip | aerodrome | New Zealand | — |
| Opikopi Airstrip | aerodrome | South Africa | — |
| Opotiki Aerodrome | aerodrome | New Zealand | ICAO NZOP |
| Oppdal flyplass, Fagerhaug | aerodrome | Norway | ICAO ENOP |
| Optands flygfält | aerodrome | Sweden | ICAO ESNM |
| Opuwo Airport | international | Opuwo, Namibia | IATA OPW · ICAO FYOP |
| Oradea International Airport | international | Romania | IATA OMR · ICAO LROD |
| Oral International Airport | international | Kazakhstan | IATA URA · ICAO UARR |
| Oram Airport | international | Papua New Guinea | IATA RAX · ICAO AYYO |
| Orán Airport | international | Argentina | IATA ORA · ICAO SASO |
| Orange Airport | international | Australia | IATA OAG · ICAO YORG |
| Orangeburg Municipal Airport | international | United States | IATA OGB · ICAO KOGB |
| Orange-Caritat Air Base | military airfield | France | ICAO LFMO |
| Orange City Municipal Airport | aerodrome | United States | — |
| Orange County Airport | aerodrome | United States | ICAO KOMH |
| Orange Grove Barn Airstrip | aerodrome | Chavenage Green, United Kingdom | — |
| Orange Grove Naval Auxiliary Landing Field | military airfield | United States | ICAO KNOG |
| Orange Hill Airport | aerodrome | United States | — |
| Orange Municipal Airport | aerodrome | United States | ICAO KORE |
| Orange Poultry Farm Airport | aerodrome | United States | — |
| Orange River Lodge Airstrip | aerodrome | South Africa | — |
| Orania Vliegveld | aerodrome | Orania, South Africa | — |
| Oranjemund Airport | international | Namibia | IATA OMD · ICAO FYOG |
| Oran Tafaraoui Airport | military airfield | Algeria | IATA TAF · ICAO DAOL |
| Orapa Airport | international | Botswana | IATA ORP · ICAO FBOR |
| Orbost Airport | international | Australia | IATA RBS · ICAO YORB |
| Orcas Island Airport | international | United States | IATA ESD · ICAO KORS |
| Orchard House Airstrip | private airstrip | United Kingdom | — |
| Orchardleigh Private Airstrip | private airstrip | United Kingdom | — |
| Orchard Ranch Airport | aerodrome | United States | — |