1142 airports and airfields in Illinois, of which 17 are large or medium commercial airports. Below are the main ones.
| Airport | IATA | ICAO | City |
|---|---|---|---|
| Chicago Midway International Airport | MDW | KMDW | Chicago |
| Chicago O'Hare International Airport | ORD | KORD | Chicago |
| Abraham Lincoln Capital Airport | SPI | KSPI | Springfield |
| Central Illinois Regional Airport At Bloomington-Normal | BMI | KBMI | Bloomington/Normal |
| Chicago Executive Airport | PWK | — | Chicago/Prospect Heights/Wheeling |
| Chicago Rockford International Airport | RFD | KRFD | Chicago/Rockford |
| Decatur Airport | DEC | KDEC | Decatur |
| Dupage Airport | DPA | KDPA | Chicago/West Chicago |
| General Wayne A. Downing Peoria International Airport | PIA | KPIA | Peoria |
| Greater Kankakee Airport | IKK | KIKK | Kankakee |
| Quad City International Airport | MLI | KMLI | Moline |
| Quincy Regional Airport Baldwin Field | UIN | KUIN | Quincy |
| Scott Afb/Midamerica Airport | BLV | KBLV | Belleville |
| Southern Illinois Airport | MDH | KMDH | Murphysboro |
| St Louis Regional Airport | ALN | KALN | Alton/St Louis |
See every airport in Illinois — including general aviation fields, heliports and seaplane bases — with runways, elevation and the nearest airports: search the airport directory.
IATA codes (three letters) are used by airlines and passengers; ICAO codes (four letters) by air-traffic control. The first letter of a US ICAO code is usually K.