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

| Company | Type | Location | Codes |
|---|---|---|---|
| Ocean Reef Club Airport | international | Key Largo, United States | IATA OCA |
| Ocean Ridge Airport | aerodrome | United States | — |
| Ocean Shores Municipal Airport | aerodrome | United States | — |
| Oceanside Municipal Airport | international | United States | IATA OCN · ICAO KOKB |
| Ocean Springs Airport | aerodrome | United States | — |
| Ockel Farms Airport | aerodrome | Milton, United States | — |
| Oconee County Regional Airport | international | Clemson, United States | IATA CEU · ICAO KCEU |
| O'Connor Field | aerodrome | United States | — |
| Oconomowoc Airport | aerodrome | United States | — |
| Oconto - J. Douglas Bake Municipal Airport | aerodrome | United States | ICAO KOCQ |
| Ocotillo Airport | aerodrome | United States |
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.
| — |
| Očová | aerodrome | Slovakia | ICAO LZOC |
| Ocracoke Island Airport | aerodrome | United States | — |
| Őcsény Airfield | aerodrome | Hungary | ICAO LHOY |
| October Airport | aerodrome | Egypt | ICAO HEOC |
| Octon Airstrip | aerodrome | United Kingdom | — |
| Odate-Noshiro Airport | international | Japan | IATA ONJ · ICAO RJSR |
| Oddsstaðir Airport | private airstrip | Iceland | — |
| Odegaard Airport | aerodrome | United States | — |
| Odell Williamson Municipal Airport | aerodrome | United States | — |
| Odesa International Airport | international | Ukraine | IATA ODS · ICAO UKOO |
| Odesa (Zastava) airfield | aerodrome | Ukraine | ICAO UKOT |
| Odessa Municipal Airport | aerodrome | United States | — |
| Odessa-Schlemeyer Field Airport | international | United States | IATA ODO · ICAO KODO |
| Odessa / Strawberry Lakes Airstrip | aerodrome | Canada | — |
| Odi Airport | aerodrome | South Africa | ICAO FAIO |
| Odienné Airport | international | Côte d'Ivoire | IATA KEO · ICAO DIOD |
| Odom Flying Airport #2 | aerodrome | United States | — |
| Odom's Roost Airport | aerodrome | United States | — |
| Odorhei | aerodrome | Romania | — |
| Oehna | regional | Germany | ICAO EDBO |
| Oeiras Airport | aerodrome | Brazil | ICAO SNOE |
| Oelwein Municipal Airport | aerodrome | United States | ICAO KOLZ |
| Oena Mine Airstrip | aerodrome | South Africa | — |
| Oenpelli Airport | international | Australia | IATA OPI · ICAO YOEN |
| Oesman Sadik Airport | international | Indonesia | IATA LAH · ICAO WAEL |
| Oeventrop Ruhrwiesen | aerodrome | Germany | — |
| Offenburg Airfield | aerodrome | Germany | ICAO EDTO |
| Offenbüttel UL | private airstrip | Germany | — |
| Offutt Air Force Base | military airfield | United States | IATA OFF · ICAO KOFF |
| Ofu Airport | international | United States | IATA OFU · ICAO NSAS |
| Ogaryovo Helicopter Base | heliport | Russia | — |
| Ogden-Hinckley Airport | international | United States | IATA OGD · ICAO KOGD |
| Ogdensburg International Airport | international | United States | IATA OGS · ICAO KOGS |
| Ogeranang Airport | international | Papua New Guinea | IATA OGE · ICAO AYOG |
| Oghab 44 Airfield | military airfield | Iran | — |
| Ogilivies Creek Airstrip (overgrown) | aerodrome | Australia | — |
| Ogilvie Aerodrome | aerodrome | Canada | — |
| Ogle County Airport | aerodrome | United States | — |
| Oglesby Farms Inc Airport | aerodrome | United States | — |