| RCE | - | Roche Harbor Sea Plane Base | Roche Harbor | |
| RKS | KRKS | Rock Springs-Sweetwater County Airport | Rock Springs | |
| RWI | KRWI | Rocky Mount-Wilson Airport | Rocky Mount/Wilson | |
| BJC | KBJC | Rocky Mountain Metropolitan Airport | Broomfield | |
| ROG | KROG | Rogers Municipal Airport - Carter Field | Rogers | |
| ROF | - | Rohrer Field | Montague | |
| RLA | KVIH | Rolla Downtown Airport | Rolla | |
| - | - | Romeo State | Romeo | |
| - | - | Ronan | Ronan | |
| RSJ | - | Rosario Sea Plane Base | Rosario | |
| CRX | KCRX | Roscoe Turner Airport | Corinth | |
| ROX | KROX | Roseau Municipal Airport | Roseau | |
| RBG | KRBG | Roseburg Regional Airport | Roseburg | |
| ROW | KROW | Roswell International Air Center | Roswell | |
| RBY | PARY | Ruby Airport | Ruby | |
| - | KRUE | Russellville Regional Airport | Russellville | |
| RSH | - | Russian Mission Airport | Russian Mission | |
| RUT | KRUT | Rutland Airport | Rutland | |
| SAC | KSAC | Sacramento Executive Airport | Sacramento | |
| SAD | KSAD | Safford Regional Airport | Safford | |
| SGU | KSGU | Saint George Municipal Airport | Saint George | |
| FPR | KFPR | Saint Lucie County Airport | Fort Pierce | |
| KSM | PASM | Saint Mary's Airport | Saint Mary's | |
| SNP | PASN | Saint Paul Island Airport | Saint Paul Island | |
| SLN | KSLN | Salina Regional Airport | Salina | |
| SNS | KSNS | Salinas Municipal Airport | Salinas | |
| SJT | KSJT | San Angelo Regional Airport | San Angelo | |
| SBD | KSBD | San Bernadino International Airport | San Bernardino | |
| SQL | KSQL | San Carlos Airport | San Carlos | |
| UGI | - | San Juan Sea Plane Base | Uganik | |
| SBP | KSBP | San Luis Obispo County Regional Airport | San Luis Obispo | |
| SDP | PASD | Sand Point Municipal Airport | Sand Point | |
| SAF | KSAF | Santa Fe Municipal Airport | Santa Fe | |
| SMX | KSMX | Santa Maria Public Airport | Santa Maria | |
| SMO | KSMO | Santa Monica Municipal Airport | Santa Monica | |
| SZP | KSZP | Santa Paula Airport | Santa Paula | |
| SQA | KIZA | Santa Ynez Airport | Santa Ynez | |
| SRQ | KSRQ | Sarasota Bradenton International Airport | Sarasota | |
| - | KSNH | Savannah Hardin County Airport | Savannah | |
| SVA | PASA | Savoonga Airport | Savoonga | |
| MQT | KSAW | Sawyer International Airport | Marquette | |
| SCM | - | Scammon Bay Sea Plane Base | Scammon Bay | |
| SCH | KSCH | Schenectady County Airport | Schenectady | |
| - | KSCX | Scott Municipal | Oneida | |
| SCF | KSDL | Scottsdale Airport | Phoenix | |
| SFM | KSFM | Seacoast Regional Airport | Sanford | |
| SYB | - | Seal Bay Seaplane Base | Seal Bay | |
| SWO | KSWO | Searcy Field | Stillwater | |
| SDX | KSEZ | Sedona Airport | Sedona | |
| WLK | PASK | Selawik Airport | Selawik | |