| - | - | Sierra Sky Park | Fresno | |
| - | - | Sierraville Dearwater | Sierraville | |
| - | - | Sig Field | Montezuma | |
| - | - | Sikes | Luverne | |
| SIK | KSIK | Sikeston Memorial Airport | Sikeston | |
| JSD | - | Sikorsky Heliport | Stratford | |
| - | - | Siler City Municipal | Siler City | |
| - | - | Siletz Bay State | Gleneden Beach | |
| - | KBFW | Silver Bay Municipal | Silver Bay | |
| - | - | Silver City | Alpena | |
| - | - | Silver Lake F S Strip | Silver Lake | |
| - | - | Silver Springs | Silver Springs | |
| - | - | Silver West | Westcliffe | |
| - | - | Silverwood | Athol | |
| FBG | KFBG | Simmons Army Airfield | Fort Bragg | |
| - | - | Simpson | Philippi | |
| - | - | Simsbury | Simsbury | |
| - | KSOY | Sioux Center Municipal | Sioux Center | |
| SIY | KSIY | Siskiyou County Airport | Montague | |
| - | - | Sisseton Municipal | Sisseton | |
| - | - | Sisters Eagle Air | Sisters | |
| SKJ | - | Sitkinak Island Coast Guard Station | Sitkinak Island | |
| - | - | Skaneateles | Skaneateles | |
| - | PAZK | Skelton | Eureka | |
| - | - | Skiatook Municipal | Skiatook | |
| - | - | Skie-Lincoln Co | Tea | |
| SKW | PASW | Skwentna Intermediate Airport | Skwentna | |
| - | - | Sky Acres | Millbrook | |
| - | - | Sky Harbor | Sultan | |
| - | KDYT | Sky Harbor | Duluth | |
| OBK | - | Sky Harbor Airport | Northbrook | |
| - | - | Sky Haven | Enderlin | |
| - | - | Sky King | Terre Haute | |
| - | - | Sky Manor | Jacksonville | |
| - | - | Sky Manor | Pittstown | |
| - | - | Sky Park | Red Hook | |
| - | - | Sky Park | Newkirk | |
| - | - | Sky Ranch | Sandy Valley | |
| - | - | Skydive Chicago | Ottawa | |
| - | - | Skydive Houston | Waller | |
| - | - | Skyharbor | Selma | |
| - | - | Skyhaven | Tunkhannock | |
| - | - | Skyhaven | Warrensburg | |
| - | KDAW | Skyhaven | Rochester | |
| - | - | Skykomish State | Skykomish | |
| - | - | Skylane | Evansville | |
| - | - | Skylark Airpark | Warehouse Point | |
| ILE | KILE | Skylark Field | Killeen | |
| - | - | Skyport | Cornelius | |
| - | - | Skyway Estates | Eaton Rapids | |