List of airports: O
List of airports: A - B - C - D - E - F - G - H - I - J - K - L - M - N - O - P - Q - R - S - T - U - V - W - X - Y - Z
O
- OAK Oakland International Airport, Oakland, California, United States, near San Francisco
- OAX Oaxaca, Mexico
- OGG Kahului Airport, Kahului, Hawaii, United States
- OIT Oita, Japan
- OKC Will Rogers World Airport, Oklahoma City, Oklahoma, United States
- OKJ Okayama, Japan
- OMA Eppley Air Field, Omaha, Nebraska, United States
- OMR Oradea International Airport, Oradea, Romania
- ONT Ontario International Airport, Ontario, California, United States, near Los Angeles
- OPO Porto, Portugal
- ORD O' Hare International Airport, Chicago, Illinois, United States (formerly Orchard Field)
- ORF Norfolk International Airport, Norfolk, Virginia, United States, near Virginia Beach, Virginia and Williamsburg, Virginia
- ORK Cork International Airport, Cork, Ireland
- ORM Sywell Airport, Northampton and Peterborough, United Kingdom
- OSA All Airports, Osaka, Japan
- OSL Oslo Airport Gardermoen, Ullensaker, Norway, north of Oslo
- OSR Ostrava, Czech Republic
- OTP Otopeni International Airport, Otopeni, Romania, near Bucharest, Romania
- OUA Ouagadougou, Burkina Faso
- OUZ Zouerate, Mauritania
- OVB Tolmachevo Airport, Novosibirsk, Russia
- OXR Oxnard Airport, Oxnard, California, United States