- O Sullivan Army Air Field (schedule: departures | arrivals )
- O'Hare International Airport (schedule: departures | arrivals )
- O.R. Tambo International Airport (schedule: departures | arrivals )
- Oberpfaffenhofen (schedule: departures | arrivals )
- Ocean City Municipal (schedule: departures | arrivals )
- Ocean Reef (schedule: departures | arrivals )
- Octeville (schedule: departures | arrivals )
- Ocussi (schedule: departures | arrivals )
- Odate Noshiro Airport (schedule: departures | arrivals )
- Odessa International Airport (schedule: departures | arrivals )
- Odienne (schedule: departures | arrivals )
- Ogden Municipal (schedule: departures | arrivals )
- Ogdensburg Airport (schedule: departures | arrivals )
- Ogle Airport (schedule: departures | arrivals )
- Ohio State University (schedule: departures | arrivals )
- Ohio University (schedule: departures | arrivals )
- Ohrid Airport (schedule: departures | arrivals )
- Oita Airport (schedule: departures | arrivals )
- Okadama Airport (schedule: departures | arrivals )
- Okayama Airport (schedule: departures | arrivals )
- Okeechobee County (schedule: departures | arrivals )
- Okhotsk (schedule: departures | arrivals )
- Oki Island (schedule: departures | arrivals )
- Okino Erabu (schedule: departures | arrivals )
- Oksibil (schedule: departures | arrivals )
- Okushiri Airport (schedule: departures | arrivals )
- Olbia Costa Smeralda Airport (schedule: departures | arrivals )
- Old Crow (schedule: departures | arrivals )
- Olenyok Airport (schedule: departures | arrivals )
- Olokminsk Airport (schedule: departures | arrivals )
- Olympic Dam Airport (schedule: departures | arrivals )
- Omsk Airport (schedule: departures | arrivals )
- Ondangwa Airport (schedule: departures | arrivals )
- Ondjiva (schedule: departures | arrivals )
- Oneida County Airport (schedule: departures | arrivals )
- Oneill Municipal (schedule: departures | arrivals )
- Onotoa (schedule: departures | arrivals )
- Onslow Airport (schedule: departures | arrivals )
- Ontario International Airport (schedule: departures | arrivals )
- Oodnadatta (schedule: departures | arrivals )
- Opa-locka Executive Airport (schedule: departures | arrivals )
- Oradea Airport (schedule: departures | arrivals )
- Orange Airport (schedule: departures | arrivals )
- Orangeburg Municipal (schedule: departures | arrivals )
- Oranjemund Airport (schedule: departures | arrivals )
- Orbost (schedule: departures | arrivals )
- Orcas Island Airport (schedule: departures | arrivals )
- Ordos Ejin Horo Airport (schedule: departures | arrivals )
- Ordu Giresun Airport (schedule: departures | arrivals )
- Orebro-Bofors Airport (schedule: departures | arrivals )
- Orenburg Airport (schedule: departures | arrivals )
- Orio al Serio International Airport (schedule: departures | arrivals )
- Oriximina (schedule: departures | arrivals )
- Orland (schedule: departures | arrivals )
- Orlando Bezerra de Menezes Airport (schedule: departures | arrivals )
- Orlando Executive (schedule: departures | arrivals )
- Orlando International Airport (schedule: departures | arrivals )
- Orlando Melbourne International Airport (schedule: departures | arrivals )
- Orlando Sanford International Airport (schedule: departures | arrivals )
- Orleans (schedule: departures | arrivals )
- Ornskoldsvik Airport (schedule: departures | arrivals )
- Orsk Airport (schedule: departures | arrivals )
- Oruro (schedule: departures | arrivals )
- Osan AB (schedule: departures | arrivals )
- Osborne Mine (schedule: departures | arrivals )
- Osh Airport (schedule: departures | arrivals )
- Oshawa (schedule: departures | arrivals )
- Osijek Airport (schedule: departures | arrivals )
- Oslo Airport Gardermoen (schedule: departures | arrivals )
- Ostend-Bruges International Airport (schedule: departures | arrivals )
- Osvaldo Vieira Airport (schedule: departures | arrivals )
- Otsego County (schedule: departures | arrivals )
- Ottawa/Macdonald-Cartier International Airport (schedule: departures | arrivals )
- Ouagadougou International Airport (schedule: departures | arrivals )
- Ouani (schedule: departures | arrivals )
- Ouarzazate Airport (schedule: departures | arrivals )
- Oudomxay Airport (schedule: departures | arrivals )
- Oued Irara Airport (schedule: departures | arrivals )
- Oulu Airport (schedule: departures | arrivals )
- Outagamie County Regional Airport (schedule: departures | arrivals )
- Ouvea Airport (schedule: departures | arrivals )
- Ovda Airport (schedule: departures | arrivals )
- Owen Roberts International Airport (schedule: departures | arrivals )
- Oxford (Kidlington) (schedule: departures | arrivals )
- Oyem (schedule: departures | arrivals )