| City/Airport Name | Country | Airport Code | |
| IAMALELE | Papua New Guinea | IMA | |
| IASI | Romania | IAS | |
| IBADAN NEW IBADAN | Nigeria | IBA | |
| IBAGUE PERALES | Colombia | IBE | |
| IBIZA | Spain | IBZ | |
| IDAHO FALLS FANNING FIELD | USA | IDA | USA (IDAHO) |
| IGARKA | Russia | IAA | |
| IGIUGIG | USA | IGG | USA (ALASKA) |
| IGLOOLIK | Canada | YGT | CANADA (NW TERRITORIES) |
| IGUASSU FALLS CATARATAS | Brazil | IGU | BRAZIL (PR) |
| IGUAZU FALLS | Argentina | IGR | ARGENTINA (MS) |
| IHOSY | Madagascar | IHO | |
| IHU | Papua New Guinea | IHU | |
| IKI | Japan | IKI | |
| ILAKA EAST | Madagascar | ILK | |
| ILE DES PINS MOUE | New Caledonia | ILP | NEW CALEDONIA (F) |
| ILES DE LA MADELEINE | Canada | YGR | CANADA (QUEBEC) |
| ILHEUS | Brazil | IOS | BRAZIL (BA) |
| ILIAMNA | USA | ILI | USA (ALASKA) |
| ILLAGA | Indonesia | ILA | |
| ILLIZI ILLIRANE | Algeria | VVZ | |
| ILOILO ILOILO | Philippines | ILO | |
| ILORIN | Nigeria | ILR | |
| ILU | Indonesia | IUL | |
| IMONDA | Papua New Guinea | IMD | |
| IMPERATRIZ | Brazil | IMP | BRAZIL (MA) |
| IMPERIAL COUNTY | USA | IPL | USA (CALIFORNIA) |
| IMPFONDO | Congo, Democratic Republic of | ION | CONGO |
| IMPHAL | India | IMF | |
| IN AMENAS | Algeria | IAM | |
| IN GUEZZAM | Algeria | INF | |
| IN SALAH | Algeria | INZ | |
| INAGUA | Bahamas | IGA | |
| INANWATAN | Indonesia | INX | |
| INDAGEN | Papua New Guinea | IDN | |
| INDASELASSIE | Ethiopia | SHC | |
| INDIANAPOLIS INTERNATIONAL | USA | IND | USA (INDIANA) |
| INDORE | India | IDR | |
| INE ISLAND | Marshall Islands | IMI | |
| INHAMBANE | Mozambique | INH | |
| INISHEER | Republic of Ireland | INQ | IRELAND |
| INISHMAAN | Republic of Ireland | IIA | IRELAND |
| INISHMORE | Republic of Ireland | IOR | IRELAND |
| INNSBRUCK KRANEBITTEN | Austria | INN | |
| INONGO | | INO | ZAIRE |
| INTERNATIONAL FALLS | USA | INL | USA (MINNESOTA) |
| INUKJUAK | Canada | YPH | CANADA (QUEBEC) |
| INUVIK | Canada | YEV | CANADA (NW TERRITORIES) |
| INVERCARGILL | New Zealand | IVC | |
| INVERELL | Australia | IVR | AUSTRALIA (NSW) |
| INVERNESS DALCROSS | United Kingdom | INV | |
| INYOKERN KERN COUNTY | USA | IYK | USA (CALIFORNIA) |
| IOANNINA | Greece | IOA | |
| IOMA | Papua New Guinea | IOP | |
| IPATINGA USIMINAS | Brazil | IPN | BRAZIL (MG) |
| IPIALES SAN LUIS | Colombia | IPI | |
| IPIRANGA | Brazil | IPG | BRAZIL (AM) |
| IPOH SULTAN AZLAN SHAW | Malaysia | IPH | |
| IPOTA | Vanuatu | IPA | |
| IQUIQUE DIEGO ARACENA | Chile | IQQ | |
| IQUITOS FRANCISCO SECADA | Peru | IQT | |
| IRINGA | Tanzania | IRI | |
| IRKUTSK | Russia | IKT | |
| IRON MOUNTAIN | USA | IMT | USA (MI) |
| IRONWOOD | USA | IWD | USA (MI) |
| ISAFJORDUR | Iceland | IFJ | |
| ISFAHAN | Iran | IFN | |
| ISHIGAKI | Japan | ISG | |
| ISIRO MATARI | | IRP | ZAIRE |
| ISLAND LAKE GARDEN HILL | Canada | YIV | CANADA (MANITOBA) |
| ISLAY | United Kingdom | ILY | |
| ISLE OF MAN RONALDSWAY | United Kingdom | IOM | |
| ISLES OF SICILLY TRESCO | Ukraine | TSO | UK |
| ISLIP MC ARTHUR/LONG ISLD. | USA | ISP | USA (NEW YORK) |
| ISTANBUL ATATUERK INTERNATIONAL | Turkey | IST | |
| ITHACA | USA | ITH | USA (NEW YORK) |
| ITOKAMA | Papua New Guinea | ITK | |
| IVALO | Finland | IVL | |
| IVANO-FRANKOVSK | Ukraine | IFO | |
| IVANOF BAY | USA | KIB | USA (ALASKA) |
| IVUJIVIK | Canada | YIK | CANADA (QUEBEC) |
| IXTAPA | Mexico | ZIH | |
| IZMIR ADNAN MENDERES | Turkey | ADB | |
| IZUMO | Japan | IZO | |
