| - | KSET | St. Charles County Smartt Airport | St. Charles | |
| PLR | KPLR | St. Clair County Airport | Pell City | |
| STQ | KOYM | St. Marys Airport | Sainte Marys | |
| - | - | Stafford | Weatherford | |
| - | - | Stafford Municipal | Stafford | |
| - | - | Stafford Regional Airport | Stafford | |
| - | - | Stahl'S Mountain | Union Dale | |
| - | - | Stambaugh | Stambaugh | |
| - | - | Stampede | Kantishna | |
| - | - | Standard | Elkton | |
| - | - | Standing Rock | Ft Yates | |
| - | - | Standish Industrial | Standish | |
| - | - | Stanford | Stanford | |
| - | - | Stanford | St Anthony | |
| - | - | Stanley | Stanley | |
| - | - | Stanley Municipal | Stanley | |
| - | KVUJ | Stanly Co | Albemarle | |
| - | - | Stanton | New Paltz | |
| - | - | Stanton | Stanton | |
| - | - | Stanton Co Municipal | Johnson | |
| - | - | Stanton Municipal | Stanton | |
| - | KSAZ | Staples Municipal | Staples | |
| - | - | Star City Municipal | Star City | |
| - | - | Starbuck Municipal | Starbuck | |
| - | - | Stark'S Twin Oaks | Hillsboro | |
| - | KOXI | Starke Co | Knox | |
| - | - | Starr Co | Rio Grande City | |
| - | - | Starr-Browning | Browning | |
| GOL | - | State Airport | Gold Beach | |
| WSB | - | Steamboat Sea Plane Base | Steamboat Bay | |
| JSL | - | Steel Pier Heliport | Atlantic City | |
| - | - | Steele Municipal | Steele | |
| - | - | Stehekin State | Stehekin | |
| - | - | Stellar Airpark | Chandler | |
| - | - | Stephen Municipal | Stephen | |
| BKD | KBKD | Stephens County Airport | Breckenridge | |
| - | - | Stephens-Gilmer Municipal | Gilmer | |
| - | - | Sterling | Sterling | |
| - | - | Stevens Crosby | North Fork | |
| PGO | - | Stevens Field | Pagosa Springs | |
| - | - | Stevenson | Stevenson | |
| - | - | Stevensville | Stevensville | |
| - | - | Stewart | Waynesville | |
| - | - | Stigler Municipal | Stigler | |
| - | - | Stilwell/Cherokee Nation | Stilwell | |
| - | - | Stinson | Aberdeen | |
| SSF | KSSF | Stinson Municipal Airport | San Antonio | |
| - | - | Stockmar | Villa Rica | |
| - | - | Stockton Municipal | Stockton | |
| - | - | Stockton Municipal | Stockton | |