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

| Company | Type | Location | Codes |
|---|---|---|---|
| Orchid Beach Airport | international | Australia | IATA OKB |
| Orcopampa Airport | aerodrome | Peru | ICAO SPOR |
| Ordos Ejin Horo Airport | international | China | IATA DSN · ICAO ZBDS |
| Ord River Airport | international | Australia | IATA ODR |
| Örebro Airport | international | Sweden | IATA ORB · ICAO ESOE |
| Oreck Airport | aerodrome | United States | — |
| Oregon Hill Airport | aerodrome | United States | — |
| Orekhovo | aerodrome | Ukraine | ICAO UKYO |
| Orellana Airport | aerodrome | Peru | — |
| Orel Yuzhny Airport | international | Russia | IATA OEL |
| Orenburg Air Base | military airfield | Russia | — |
| Orenburg Central 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.
| Russia |
| IATA REN · ICAO UWOO |
| Öresten flygplats | aerodrome | Sweden | ICAO ESGM |
| Oricanga de Abreu | aerodrome | Brazil | ICAO SWPZ |
| Orielton Airport | aerodrome | Australia | — |
| Orient Glider Airport | aerodrome | South Africa | ICAO FAOI |
| Orientos | international | Australia | IATA OXO |
| Orient Well Airport | aerodrome | Australia | — |
| O'Riley Airport | aerodrome | United States | — |
| Orillia Airport | aerodrome | Canada | — |
| Orillia/Lake St John Seaplane Base | aerodrome | Canada | — |
| Orillia/Matchedash Lake Seaplane Base | aerodrome | Canada | — |
| Orinduik Airport | international | Orinduik, Guyana | IATA ORJ · ICAO SYOR |
| Orinduque | aerodrome | Brazil | — |
| Orini Airfield | aerodrome | New Zealand | — |
| Oriny | aerodrome | South Sudan | — |
| Oripää Airfield | aerodrome | Finland | ICAO EFOP |
| Oristano-Fenosu Airport | international | Italy | IATA FNU · ICAO LIER |
| Oritupano Runway | aerodrome | Venezuela | — |
| Oriximiná Airport | international | Brazil | IATA ORX · ICAO SNOX |
| Orkney Airfield | aerodrome | South Africa | ICAO FAOY |
| Orlampa Inc. Airport | aerodrome | United States | — |
| Orlando Apopka Airport | aerodrome | United States | — |
| Orlando Bezerra de Menezes Airport | international | Brazil | IATA JDO · ICAO SBJU |
| Orlando Executive Airport | international | United States | IATA ORL · ICAO KORL |
| Orlando International Airport | international | Orlando, United States | IATA MCO · ICAO KMCO |
| Orlando North Air Park | aerodrome | United States | — |
| Orlando Sanford International Airport | international | Sanford, United States | IATA SFB · ICAO KSFB |
| Orlando Villas-Bôas Regional Airport | international | Brazil | IATA MBK · ICAO SWXM |
| Orleans Airport | aerodrome | United States | — |
| Orleans Farm Airport | aerodrome | Australia | — |
| Orliak | aerodrome | Bulgaria | — |
| Orlovka | aerodrome | Russia | ICAO UUTO |
| Orly (Olooitikosh) Airport | aerodrome | Kenya | ICAO HKIK |
| Orlyonok | aerodrome | Russia | — |
| Ormara Airport | international | Pakistan | IATA ORW · ICAO OPOR |
| Ormazabal Trabajos Agrícolas | aerodrome | Uruguay | — |
| Ormoc Airport | international | Philippines | IATA OMC · ICAO RPVO |
| Ormond Beach Municipal Airport | regional | Ormond Beach, United States | ICAO KOMN |
| Ornate Lake - St. Lucia Airport | aerodrome | South Africa | ICAO FAON |