Airports By City Name
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| City name | Country | Country Abbrev. | Airport name | Airport Code | |
| Oahu | United States | US |  | Dillingham Airfield | HDH |
| Oak Harbor | United States | US | | Oak Harbor | ODW |
| Oak Harbor | United States | US | | Whidbey Island NAS (Ault Field) | NUW |
| Oakey | Australia | AU | | Oakey | OKY |
| Oakham | United Kingdom | GB | | Cottesmor RAF | OKH |
| Oakland | United States | US | | Convention Center H/P | JCE |
| Oakland | United States | US | | Oakland International Airport | OAK |
| Oakland, MD | United States | US | | Oakland/Coliseum Stat | OBT |
| Oaktown | United States | US | | Green | OTN |
| Oamaru | New Zealand | NZ | | Oamaru | OAM |
| Oaxaca | Mexico | MX | | Xoxocotlan | OAX |
| Oban | Australia | AU | | Oban | OBA |
| Oban | United Kingdom | GB | | Oban Airport | OBN |
| Oban | United Kingdom | GB | | Heliport | OHP |
| Obano | Indonesia | ID | | Obano | OBD |
| City name | Country | Country Abbrev. | Airport name | Airport Code | |
| Obbia | Somalia | SO | | Obbia | CMO |
| Oberpfaffenhofen | Germany | DE | | Oberpfaffenhofen | OBF |
| Obidos | Brazil | BR | | Obidos | OBI |
| Obihiro | Japan | JP | | Obihiro | OBO |
| Obo | Papua New Guinea | PG | | Obo | OBX |
| Obock | Djibouti | DJ | | Obock | OBC |
| Obre Lake | Canada | CA | | Obre Lake | YDW |
| Obyan | Northern Mariana Islands | MP | | Saipan International | SPN |
| Ocala | United States | US | | Taylor Field | OCF |
| Ocana | Colombia | CO | | Aguasclaras | OCV |
| Ocean City | United States | US | | Municipal | OCE |
| Ocean Falls | Canada | CA | | Ocean Falls | ZOF |
| Ocean Reef | United States | US | | Ocean Reef | OCA |
| Oceana | United States | US | | NAS | NTU |
| Oceanic | United States | US | | Oceanic | OCI |
| City name | Country | Country Abbrev. | Airport name | Airport Code | |
| Oceanside | United States | US | | Municipal | OCN |
| Ocho Rios | Jamaica | JM | | Boscobel | OCJ |
| Ocussi | Indonesia | ID | | Ocussi | OEC |
| Odate Noshiro | Japan | JP | | Odate Noshiro | ONJ |
| Oddor Meanche | Cambodia | KH | | Oddor Meanche | OMY |
| Odense | Denmark | DK | | Beldringe | ODE |
| Odessa | Ukraine | UA | | Odessa International | ODS |
| Odienne | Cote D'Ivoire (Ivory Coast) | CI | | Odienne | KEO |
| Odiham | United Kingdom | GB | | RAF Station | ODH |
| Oenpelli | Australia | AU | | Oenpelli | OPI |
| Ogallala | United States | US | | Searle Field | OGA |
| Ogden | United States | US | | Hill Afb | HIF |
| Ogden | United States | US | | Municipal | OGD |
| Ogdensburg | United States | US | | Ogdensburg | OGS |
| Ogeranang | Papua New Guinea | PG | | Ogeranang | OGE |
| City name | Country | Country Abbrev. | Airport name | Airport Code | |
| Ogle | Guyana | GY | | Ogle | OGL |
| Ogoki | Canada | CA | | Ogoki | YOG |
| Ohakea | New Zealand | NZ | | Royal Air Force Base | OHA |
| Ohrid | Macedonia | MK | | Ohrid | OHD |
| Oiapoque | Brazil | BR | | Oiapoque | OYK |
| Oil City, PA | United States | US | | Splane Memorial | OIL |
| Oita | Japan | JP | | Oita | OIT |
| Okaba | Indonesia | ID | | Okaba | OKQ |
| Okao | Papua New Guinea | PG | | Okao | OKV |
| Okaukuejo | Namibia | NA | | Okaukuejo | OKF |
| Okayama | Japan | JP | | Okayama | OKJ |
| Okeechobee | United States | US | | County | OBE |
| Okhotsk | Russian Federation | RU | | Okhotsk | OHO |
| Oki Island | Japan | JP | | Oki Island | OKI |
| Okinawa | Japan | JP | | Kadena AB | DNA |
| City name | Country | Country Abbrev. | Airport name | Airport Code | |
| Okinawa | Japan | JP | | Naha Air Force Base | AHA |
| Okino Erabu | Japan | JP | | Okino Erabu | OKE |
| Oklahoma City | United States | US | | Downtown Airpark | DWN |
| Oklahoma City | United States | US | | Tinker AFB | TIK |
| Oklahoma City | United States | US | | Wiley Post | PWA |
| Oklahoma City | United States | US | | Will Rogers World Airport | OKC |
| Okmulgee | United States | US | | Okmulgee | OKM |
| Okondja | Gabon | GA | | Okondja | OKN |
| Okoyo | Congo | CG | | Okoyo | OKG |
| Oksapmin | Papua New Guinea | PG | | Oksapmin | OKP |
| Oksibil | Indonesia | ID | | Oksibil | OKL |
| Oktiabrskij | Russian Federation | RU | | Oktiabrskij | OKT |
| Okushiri | Japan | JP | | Okushiri | OIR |
| Olafsfjordur | Iceland | IS | | Olafsfjordur | OFJ |
| Olafsvik | Iceland | IS | | Rif | OLI |
| City name | Country | Country Abbrev. | Airport name | Airport Code | |
| Olanchito | Honduras | HN | | Olanchito | OAN |
| Olathe, KS | United States | US | | Johnson County Executive | OJC |
| Olathe, KS | United States | US | | New Century Aircenter Airport | JCI |
| Olavarria | Argentina | AR | | Olavarria | OVR |
| Olbia | Italy | IT | | Costa Smeralda | OLB |
| Old Crow | Canada | CA | | Old Crow | YOC |
| Old Fort Bay | Canada | CA | | Old Fort Bay | ZFB |
| Old Harbor | United States | US | | Old Harbor SPB | OLH |
| Old Town | United States | US | | Old Town | OLD |
| Olean | United States | US | | Municipal | OLE |
| Olga Bay | United States | US | | Olga Bay SPB | KOY |
| Olive Branch | United States | US | | Olive Branch Arpt | OLV |
| Olney | United States | US | | Olney-Noble | OLY |
| Olney | United States | US | | Olney | ONY |
| Olomouc | Czech Republic | CZ | | Olomouc | OLO |
| City name | Country | Country Abbrev. | Airport name | Airport Code | |
| Olpoi | Vanuatu | VU | | Olpoi | OLJ |
| Olsobip | Papua New Guinea | PG | | Olsobip | OLQ |
| Olympia | United States | US | | Olympia | OLM |
| Olympic Dam | Australia | AU | | Olympic Dam | OLP |
| Omaha | United States | US | | Eppley Airfield | OMA |
| Omak | United States | US | | Municipal | OMK |
| Omboue | Gabon | GA | | Omboue | OMB |
| Omega | Namibia | NA | | Omega | OMG |
| Omidieh | Iran | IR | | Omidieh | OMI |
| Omkalai | Papua New Guinea | PG | | Omkalai | OML |
| Omora | Papua New Guinea | PG | | Omora | OSE |
| Omsk | Russian Federation | RU | | Omsk | OMS |
| Omura | Japan | JP | | Omura | OMJ |
| Ondangwa | Namibia | NA | | Ondangwa | OND |
| Oneill | United States | US | | Municipal | ONL |
| City name | Country | Country Abbrev. | Airport name | Airport Code | |
| Oneonta | United States | US | | Municipal | ONH |
| Onepusu | Solomon Islands | SB | | Onepusu | ONE |
| Ongava Game Reserve | Namibia | NA | | Ongava Game Reserve | OGV |
| Ongiva | Angola | AO | | Ongiva | VPE |
| Onion Bay | United States | US | | Onion Bay | ONN |
| Ono I Lau | Fiji | FJ | | Ono I Lau | ONU |
| Ononge | Papua New Guinea | PG | | Ononge | ONB |
| Onotoa | Kiribati | KI | | Onotoa | OOT |
| Onslow | Australia | AU | | Onslow | ONS |
| Ontario | United States | US | | Ontario International | ONT |
| Ontario | United States | US | | Intl Heliport | JIO |
| Ontario, OR | United States | US | | Ontario Municipal Airport | ONO |
| Ontong Java | Solomon Islands | SB | | Ontong Java | OTV |
| Oodnadatta | Australia | AU | | Oodnadatta | ODD |
| Opapamiska Lake | Canada | CA | | Musselwhite | YBS |
| City name | Country | Country Abbrev. | Airport name | Airport Code | |
| Opelousas | United States | US | | St Landry Parish | OPL |
| Open Bay | Papua New Guinea | PG | | Open Bay | OPB |
| Opuwa | Namibia | NA | | Opuwa | OPW |
| Oqatsut | Greenland | GL | | Harbour | XEO |
| Oradea | Romania | RO | | Oradea | OMR |
| Oram | Papua New Guinea | PG | | Oram | RAX |
| Oran | Algeria | DZ | | Es Senia | ORN |
| Oran | Algeria | DZ | | Tafaraoui | TAF |
| Oran | Argentina | AR | | Oran | ORA |
| Orange | Australia | AU | | Springhill | OAG |
| Orange | United States | US | | The City Heliport | JOR |
| Orange Walk | Belize | BZ | | Orange Walk | ORZ |
| Orangeburg | United States | US | | Municipal | OGB |
| Oranjemund | Namibia | NA | | Oranjemund | OMD |
| Orapa | Botswana | BW | | Orapa | ORP |
| City name | Country | Country Abbrev. | Airport name | Airport Code | |
| Orbost | Australia | AU | | Orbost | RBS |
| Orchid Beach | Australia | AU | | Fraser Island | OKB |
| Orchid Island | Taiwan | TW | | Orchid Island | KYD |
| Ord River | Australia | AU | | Ord River | ODR |
| Orebro | Sweden | SE | | Orebro-bofors | ORB |
| Orel | Russian Federation | RU | | Orel | OEL |
| Orenburg | Russian Federation | RU | | Orenburg | REN |
| Oria | Papua New Guinea | PG | | Oria | OTY |
| Orientos | Australia | AU | | Orientos | OXO |
| Orinduik | Guyana | GY | | Orinduik | ORJ |
| Oriximina | Brazil | BR | | Oriximina | ORX |
| Orkney Island | United Kingdom | GB | | Orkney Island | KOI |
| Orland | Norway | NO | | Orland | OLA |
| Orlando | United States | US | | Orlando Executive | ORL |
| Orlando | United States | US | | Walt Disney World | DWS |
| City name | Country | Country Abbrev. | Airport name | Airport Code | |
| Orlando, FL | United States | US | | Orlando International | MCO |
| Orleans | France | FR | | Orleans | ORE |
| Ormara | Pakistan | PK | | Ormara | ORW |
| Ormoc | Philippines | PH | | Ormoc | OMC |
| Ornskoldsvik | Sweden | SE | | Ornskoldsvik | OER |
| Orocue | Colombia | CO | | Orocue | ORC |
| Oroville | United States | US | | Oroville | OVE |
| Orpheus Island Resort | Australia | AU | | Waterport | ORS |
| Orsk | Russian Federation | RU | | Orsk | OSW |
| Orsta-Volda | Norway | NO | | Hovden | HOV |
| Oruro | Bolivia | BO | | Oruro | ORU |
| Osage Beach | United States | US | | Osage Beach | OSB |
| Osaka | Japan | JP | | Itami | ITM |
| Osaka | Japan | JP | | Kansai International | KIX |
| Osan | Republic of Korea | KR | | Osan AB | OSN |
| City name | Country | Country Abbrev. | Airport name | Airport Code | |
| Osceola | United States | US | | Municipal | OEO |
| Oscoda | United States | US | | Wurtsmith AFB | OSC |
| Osh | Kyrgyzstan | KG | | Osh International Airport | OSS |
| Oshakati | Namibia | NA | | Oshakati | OHI |
| Oshawa | Canada | CA | | Oshawa | YOO |
| Oshima | Japan | JP | | Oshima | OIM |
| Oshkosh | United States | US | | Oshkosh | OKS |
| Oshkosh | United States | US | | Wittman Field | OSH |
| Osijek | Croatia (hrvatska) | HR | | Osijek | OSI |
| Oskaloosa | United States | US | | Municipal | OOA |
| Oskarshamn | Sweden | SE | | Oskarshamn | OSK |
| Oslo | Norway | NO | | Oslo (Gardermoen) | OSL |
| Osmanabad | India | IN | | Osmanabad | OMN |
| Osorno | Chile | CL | | Cañal Bajo | ZOS |
| Ossima | Papua New Guinea | PG | | Ossima | OSG |
| City name | Country | Country Abbrev. | Airport name | Airport Code | |
| Ostend | Belgium | BE | | Ostend/Bruges International Airport | OST |
| Ostersund | Sweden | SE | | Åre Östersund Airport | OSD |
| Ostrava | Czech Republic | CZ | | Mosnov | OSR |
| Otjiwarongo | Namibia | NA | | Otjiwarongo | OTJ |
| Ottawa | Canada | CA | | Fallowfield Railway | ZIF |
| Ottawa | Canada | CA | | Executive Gatineau-Ottawa | YND |
| Ottawa | Canada | CA | | Ottawa Macdonald-Cartier International | YOW |
| Ottawa | Canada | CA | | Rockcliffe St | YRO |
| Otto | United States | US | | Vor | OTO |
| Ottumwa | United States | US | | Industrial | OTM |
| Otu | Colombia | CO | | Otu | OTU |
| Ouadda | Central African Republic | CF | | Ouadda | ODA |
| Ouagadougou | Burkina Faso | BF | | Ouagadougou | OUA |
| Ouahigouya | Burkina Faso | BF | | Ouahigouya | OUG |
| Ouanda Djalle | Central African Republic | CF | | Ouanda Djalle | ODJ |
| City name | Country | Country Abbrev. | Airport name | Airport Code | |
| Ouanga | Gabon | GA | | Ouanga | OUU |
| Ouango Fitini | Cote D'Ivoire (Ivory Coast) | CI | | Ouango Fitini | OFI |
| Ouargla | Algeria | DZ | | Ain Beida | OGX |
| Ouarzazate | Morocco | MA | | Ouarzazate | OZZ |
| Oudomxay | Laos | LA | | Oudomxai | ODY |
| Oudtshoorn | South Africa | ZA | | Oudtshoorn | OUH |
| Ouesso | Congo | CG | | Ouesso | OUE |
| Oujda | Morocco | MA | | Les Anglades | OUD |
| Oulu | Finland | FI | | Oulu | OUL |
| Oum Hadjer | Chad | TD | | Oum Hadjer | OUM |
| Ourilandia | Brazil | BR | | Ourilandia | OIA |
| Ourinhos | Brazil | BR | | Ourinhos | OUS |
| Outer Skerries | United Kingdom | GB | | Outer Skerries | OUK |
| Ouvea | New Caledonia | NC | | Ouvea | UVE |
| Ouyen | Australia | AU | | Ouyen | OYN |
| City name | Country | Country Abbrev. | Airport name | Airport Code | |
| Ouzinkie | United States | US | | Ouzinkie SPB | KOZ |
| Ovalle | Chile | CL | | Ovalle | OVL |
| Overberg | South Africa | ZA | | Overberg (FAOB) | OVG |
| Oviedo/Aviles | Spain | ES | | Asturias | OVD |
| Owando | Congo | CG | | Owando | FTX |
| Owatonna | United States | US | | Owatonna | OWA |
| Owekeno Village | Canada | CA | | Rivers Inlet | YRN |
| Owen Sound | Canada | CA | | Billy Bishop Regional | YOS |
| Owendo | Gabon | GA | | Owendo | OWE |
| Owensboro | United States | US | | Daviess County | OWB |
| Oxford | United Kingdom | GB | | Raf Brize Norton | BZZ |
| Oxford | United Kingdom | GB | | Oxford (Kidlington) | OXF |
| Oxford | United States | US | | University-Oxford | UOX |
| Oxford | United States | US | | Miami University | OXD |
| Oxford House | Canada | CA | | Oxford House | YOH |
| City name | Country | Country Abbrev. | Airport name | Airport Code | |
| Oxford, CT | United States | US | | Waterbury-oxford | OXC |
| Oyem | Gabon | GA | | Oyem | OYE |
| Ozamis City | Philippines | PH | | Labo | OZC |
| Ozark | United States | US | | Cairns AAF | OZR |
| Ozark | United States | US | | Hanchey Army Heliport | HEY |
| Ozark, AL | United States | US | | Lowe Army Heliport | LOR |
| Ozona | United States | US | | Ozona Municipal | OZA |