| SFR | - | San Fernando Airport | San Fernando | |
| - | - | San Geronimo | San Antonio | |
| - | XS67 | San Jose I | Rockport | |
| MXC | - | San Juan County Airport | Monticello | |
| - | - | San Manuel | San Manuel | |
| - | KHYI | San Marcos Municipal | San Marcos | |
| - | KNSI | San Nicolas I Nolf | San Nicolas I | |
| - | - | San Patricio Co | Sinton | |
| JSG | - | San Rafael Heliport | San Rafael | |
| - | - | San Saba Co Municipal | San Saba | |
| - | - | Sand Canyon | Chewelah | |
| - | - | Sand Springs | Sand Springs | |
| SHN | KSHN | Sanderson Field | Shelton | |
| - | - | Sandia Airpark Estates East | Edgewood | |
| - | KSZT | Sandpoint | Sandpoint | |
| - | - | Sandstone Municipal | Sandstone | |
| - | - | Sandusky City | Sandusky | |
| - | - | Sandusky County Regional Airport | Fremont | |
| - | - | Sandy River Airport | Sandy | |
| - | - | Sanford-Lee Co Brick | Sanford | |
| - | - | Sanger | Monee | |
| SZN | - | Santa Cruz Island Airport | Santa Barbara | |
| SRU | - | Santa Cruz Skypark | Santa Cruz | |
| - | - | Santa Rosa Municipal | Santa Rosa | |
| - | KMNI | Santee Cooper Regional | Manning | |
| - | - | Santiam Junction State | Santiam Junction | |
| - | - | Saratoga Co | Saratoga Springs | |
| - | - | Sargent Municipal | Sargent | |
| WSF | - | Saricheff Airport | Saricheff | |
| - | - | Satanta Municipal | Satanta | |
| NUN | KNUN | Saufley Naval Air Station | Pensacola | |
| - | - | Sauk Centre Municipal | Sauk Centre | |
| - | - | Sauk-Prairie | Prairie Du Sac | |
| SSM | KANJ | Sault Ste Marie Municipal Airport | Sault Ste Marie | |
| - | - | Savage | Montezuma | |
| - | - | Sayre Municipal | Sayre | |
| - | - | Scandia | Russell | |
| - | KSPB | Scappoose Industrial | Scappoose | |
| - | - | Schafer Usfs | Schafer | |
| JMH | - | Schaumburg Marriott Heliport | Schaumburg | |
| - | - | Schaumburg Regional | Chicago/Schaumburg | |
| ICL | KICL | Schenk Field | Clarinda | |
| - | - | Schertz | Gibson City | |
| - | - | Schiffer Acres | St Johns | |
| SUC | - | Schloredt Airport | Sundance | |
| - | - | Schneiders | Revere | |
| GLS | KGLS | Scholes Field | Galveston | |
| ISQ | KISQ | Schoolcraft County Airport | Manistique | |
| - | - | Schroeder Field | Hillsboro | |
| - | - | Schroon Lake | Schroon Lake | |