| | IATA | ICAO | City ^ | Region | State | Country | | IZO | | Izumo | | | Japan |
| ADB | | Izmir | | | Turkey |
| IJK | | Izhevsk | | | Russia |
| ZIH | | Ixtapa/Zihuatanejo | | Guerrero | Mexico |
| ITH | | Ithaca | | NEW YORK | USA |
| IST | | Istanbul | | | Turkey |
| ISP | | Islip | | NEW YORK | USA |
| ISC | | Isles of Scilly | | Isles of Scilly | Great Britain |
| IOM | | Isle of Man | | Isle of Man | Great Britain |
| ILY | | Islay | | Scotland | Great Britain |
| ISB | | Islamabad | | | Pakistan |
| IWD | | Ironwood | | MICHIGAN | USA |
| IMT | | Iron Mountain | | MICHIGAN | USA |
| IKT | | Irkutsk | | | Russia |
| IQT | | Iquitos | | | Peru |
| IQQ | | Iquique | | | Chile |
| YFB | | Iqaluit | | Northwest Territories... | Canada |
| IPH | | Ipoh | | | Malaysia |
| IPI | | Ipiales | | | Colombia |
| IOA | | Ioannina | | | Greece |
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