| City served | FAA | IATA | ICAO | Airport name | Role | Enpl. |
|---|
| Commercial Service – Primary airports |
| Belleville | BLV | BLV | KBLV | MidAmerica St. Louis Airport / Scott Air Force Base | P-N | 79,988 |
| Bloomington / Normal | BMI | BMI | KBMI | Central Illinois Regional Airport at Bloomington-Normal | P-N | 188,490 |
| Champaign / Urbana | CMI | CMI | KCMI | University of Illinois - Willard Airport | P-N | 89,318 |
| Chicago | ORD | ORD | KORD | Chicago O'Hare International Airport | P-L | 37,589,899 |
| Chicago | MDW | MDW | KMDW | Chicago Midway International Airport | P-L | 11,044,387 |
| Marion | MWA | MWA | KMWA | Williamson County Regional Airport | P-N | 10,044 |
| Moline | MLI | MLI | KMLI | Quad City International Airport | P-N | 364,393 |
| Peoria | PIA | PIA | KPIA | General Wayne A. Downing Peoria International Airport | P-N | 307,189 |
| Quincy | UIN | UIN | KUIN | Quincy Regional Airport (Baldwin Field) | P-N | 7,847 |
| Rockford | RFD | RFD | KRFD | Chicago Rockford International Airport {{small>(was Northwest Chicagoland Regional Airport at Rockford)}} | P-N | 101,790 |
| Springfield | SPI | SPI | KSPI | Abraham Lincoln Capital Airport | P-N | 93,269 |
| Commercial Service – Nonprimary airports |
| Decatur | DEC | DEC | KDEC | Decatur Airport | CS | 8,453 |
| Reliever airports |
| Alton / St. Louis | ALN | ALN | KALN | St. Louis Regional Airport | R | 0 |
| Aurora | ARR | AUZ | KARR | Aurora Municipal Airport | R | 0 |
| Cahokia / St. Louis | CPS | CPS | KCPS | St. Louis Downtown Airport | R | 3,586 |
| Lake in the Hills | 3CK | Lake in the Hills Airport | R | 0 |
| Lansing | IGQ | | KIGQ | Lansing Municipal Airport | R | 0 |
| Prospect Heights / Wheeling | PWK | PWK | KPWK | (was Palwaukee Municipal Airport)}} | R | 308 |
| Romeoville | LOT | LOT | KLOT | Lewis University Airport | R | 21 |
| Waukegan | UGN | UGN | KUGN | Waukegan Regional Airport | R | 67 |
| West Chicago | DPA | DPA | KDPA | DuPage Airport (DuPage County) | R | 124 |
| General Aviation airports |
| Aledo | C00 | Mercer County Airport | GA | 0 |
| Beardstown | K06 | Greater Beardstown Airport | GA | 0 |
| Benton | H96 | Benton Municipal Airport | GA | 0 |
| Bolingbrook | 1C5 | Bolingbrook's Clow International Airport | GA | 0 |
| Cairo | CIR | CIR | KCIR | Cairo Regional Airport | GA | 0 |
| Canton | CTK | | KCTK | Ingersoll Airport | GA | 0 |
| Carbondale / Murphysboro | MDH | MDH | KMDH | Southern Illinois Airport | GA | 291 |
| Carmi | CUL | | KCUL | Carmi Municipal Airport | GA | 0 |
| Casey | 1H8 | Casey Municipal Airport | GA | 0 |
| Centralia | ENL | ENL | KENL | Centralia Municipal Airport | GA | 0 |
| Danville | DNV | DNV | KDNV | Vermilion Regional Airport | GA | 0 |
| DeKalb | DKB | | KDKB | DeKalb Taylor Municipal Airport | GA | 28 |
| Dixon | C73 | Dixon Municipal Airport (Charles R. Walgreen Field) | GA | 0 |
| Effingham | 1H2 | Effingham County Memorial Airport | GA | 0 |
| Fairfield | FWC | | KFWC | Fairfield Municipal Airport | GA | 0 |
| Flora | FOA | | KFOA | Flora Municipal Airport | GA | 0 |
| Freeport | FEP | FEP | KFEP | Albertus Airport | GA | 0 |
| Galesburg | GBG | GBG | KGBG | Galesburg Municipal Airport | GA | 1,215 |
| Grayslake | C81 | Campbell Airport | GA | 0 |
| Greenville | GRE | GRE | KGRE | Greenville Airport | GA | 0 |
| Greenwood / Wonder Lake | 10C | Galt Field | GA | 0 |
| Harrisburg | HSB | HSB | KHSB | Harrisburg-Raleigh Airport | GA | 0 |
| Harvard | 0C0 | Dacy Airport | GA | 0 |
| Havana | 9I0 | Havana Regional Airport | GA | 0 |
| Jacksonville | IJX | IJX | KIJX | Jacksonville Municipal Airport | GA | 0 |
| Joliet | JOT | JOT | KJOT | Joliet Regional Airport | GA | 0 |
| Kankakee | IKK | IKK | KIKK | Greater Kankakee Airport | GA | 4 |
| Kewanee | EZI | | KEZI | Kewanee Municipal Airport | GA | 0 |
| Lacon | C75 | Marshall County Airport | GA | 0 |
| Lawrenceville | LWV | LWV | KLWV | Lawrenceville-Vincennes International Airport | GA | 0 |
| Lincoln | AAA | | KAAA | Logan County Airport | GA | 0 |
| Litchfield | 3LF | Litchfield Municipal Airport | GA | 0 |
| Macomb | MQB | MQB | KMQB | Macomb Municipal Airport | GA | 66 |
| Mattoon / Charleston | MTO | MTO | KMTO | Coles County Memorial Airport | GA | 0 |
| Metropolis | M30 | Metropolis Municipal Airport | GA | 0 |
| Monee | C56 | Bult Field | GA | 0 |
| Monmouth | C66 | Monmouth Municipal Airport | GA | 0 |
| Monticello | 2K0 | Piatt County Airport | GA | 0 |
| Morris | C09 | Morris Municipal Airport (James R. Washburn Field) | GA | 0 |
| Mount Carmel | AJG | | KAJG | Mount Carmel Municipal Airport | GA | 0 |
| Mount Sterling | I63 | Mount Sterling Municipal Airport | GA | 76 |
| Mount Vernon | MVN | MVN | KMVN | Mount Vernon Airport | GA | 0 |
| Olney / Noble | OLY | OLY | KOLY | Olney-Noble Airport | GA | 2 |
| Paris | PRG | | KPRG | Edgar County Airport | GA | 0 |
| Pekin | C15 | Pekin Municipal Airport | GA | 0 |
| Peoria | 3MY | Mount Hawley Auxiliary Airport | GA | 0 |
| Peru / LaSalle | VYS | VYS | KVYS | Illinois Valley Regional Airport (Walter A. Duncan Field) | GA | 70 |
| Pinckneyville / DuQuoin | PJY | | KPJY | Pinckneyville-DuQuoin Airport | GA | 0 |
| Pittsfield | PPQ | | KPPQ | Pittsfield Penstone Municipal Airport | GA | 0 |
| Pontiac | PNT | | KPNT | Pontiac Municipal Airport | GA | 0 |
| Poplar Grove | C77 | Poplar Grove Airport | GA | 0 |
| Rantoul | TIP | | KTIP | Rantoul National Aviation Center (Frank Elliott Field) | GA | 0 |
| Robinson | RSV | | KRSV | (was Robinson Municipal)}} | GA | 98 |
| Rochelle | RPJ | | KRPJ | Rochelle Municipal Airport (Koritz Field) | GA | 4 |
| Salem | SLO | SLO | KSLO | Salem-Leckrone Airport | GA | 0 |
| Savanna | SFY | | KSFY | Tri-Township Airport | GA | 0 |
| Schaumburg | 06C | Schaumburg Regional Airport | GA | 0 |
| Schaumburg | 4H1 | Schaumburg Municipal Helistop | GA | 0 |
| Shelbyville | 2H0 | Shelby County Airport | GA | 0 |
| Sparta | SAR | SAR | KSAR | Sparta Community Airport (Hunter Field) | GA | 0 |
| St. Jacob | 3K6 | St. Louis Metro-East Airport (Shafer Field) | GA | 0 |
| Sterling / Rock Falls | SQI | SQI | KSQI | Whiteside County Airport (Jos. H. Bittorf Field) | GA | 0 |
| Taylorville | TAZ | | KTAZ | Taylorville Municipal Airport | GA | 0 |
| Tuscola | K96 | Tuscola Airport | GA | 0 |
| Vandalia | VLA | VLA | KVLA | Vandalia Municipal Airport | GA | 0 |
| Other public-use airports (not listed in NPIAS) |
| Apple River | 7A4 | Foster Field |
| Columbia | H49 | Sackman Field |
| Compton | C82 | Bresson Airport |
| Dwight | DTG | | KDTG | Dwight Airport |
| Erie | 3H5 | Erie Air Park |
| Freeport | C86 | Freeport/Dornink Airport |
| Geneseo | 3G8 | Gen-Airpark |
| Highland | H07 | Highland-Winet Airport |
| Hinckley | 0C2 | Hinckley Airport |
| Kankakee | 3KK | Kankakee Airport |
| Lostant | 2V3 | Hartenbower Hectares Airport |
| Mendota | 0C7 | Grandpa's Farm Mendota Airport |
| Mount Morris | C55 | Ogle County Airport |
| Newark | 0C8 | Cushing Field |
| Ottawa | 8N2 | Skydive Chicago Airport | |
| Palmyra | 5K1 | Zelmer Memorial Airpark |
| Paxton | 1C1 | Paxton Airport |
| Rockford | 1C8 | Cottonwood Airport |
| Rushville | 5K4 | Schuy-Rush Airport |
| Urbana | C16 | Frasca Field | |
| Watson | 2T2 | Percival Springs Airport |
| Yates City | 2C6 | Tri-County Airport |
| Notable private-use airports |
| Bradford | 3IS8 | BDF | Rinkenberger RLA Airport | |
| Manito | IL45 | (former public use as Manito Mitchell Airport, FAA: C45)}} |
| Notable former airports |
| Carthage | I48 | (closed) [https://web.archive.org/web/20050812080148/http://www.airnav.com/airport/I48]}} |
| Chicago | CGX | CGX | KCGX | (closed 2003) }} |
| Crestwood | I48 | (closed) [https://web.archive.org/web/20050812080148/http://www.airnav.com/airport/I48]}} |
| Earlville | C94 | 1=(closed 2010) [https://web.archive.org/web/20100328012243/http://www.airnav.com/airport/C94] }} |
| Hillsboro | 3K4 | 1=(closed 2011) [https://web.archive.org/web/20100420062528/http://www.airnav.com/airport/3K4] }} |
| New Lenox | 1C2 | (closed) [https://web.archive.org/web/20060824015003/http://www.airnav.com/airport/1C2]}} |
| Springfield | 1=(closed 1962-1964) }} |
| Springfield | 1=(1926 - 1929)}} |