- Rhinelander Oneida County AirportIdent: KRHIServes: Rhinelander
- Richard B Russell AirportIdent: KRMGServes: Rome
- Rick Husband Amarillo International AirportIdent: KAMAServes: Amarillo
- Rickenbacker International AirportIdent: KLCKServes: Columbus
- Riverside Municipal AirportIdent: KRALServes: Riverside
- Roanoke–Blacksburg Regional AirportIdent: KROAServes: Roanoke
- Roberts FieldIdent: KRDMServes: Redmond
- Robins Air Force BaseIdent: KWRBServes: Warner Robins
- Rochester International AirportIdent: KRSTServes: Rochester
- Rocky Mount Wilson Regional AirportIdent: KRWIServes: Rocky Mount
- Rocky Mountain Metropolitan AirportIdent: KBJCServes: Denver
- Rogue Valley International-Medford AirportIdent: KMFRServes: Medford
- Rosecrans Memorial AirportIdent: KSTJServes: St Joseph
- Roswell Air Center AirportIdent: KROWServes: Roswell
- Ruby AirportIdent: PARYServes: Ruby
- Russell Municipal AirportIdent: KRSLServes: Russell
- Rutland - Southern Vermont Regional AirportIdent: KRUTServes: Rutland
- Sacramento Executive AirportIdent: KSACServes: Sacramento
- Sacramento Mather AirportIdent: KMHRServes: Sacramento
- Saint Cloud Regional AirportIdent: KSTCServes: Saint Cloud
- Saint Paul Downtown Holman FieldIdent: KSTPServes: Saint Paul
- Salem-Willamette Valley Airport/McNary FieldIdent: KSLEServes: Salem
- Salina Municipal AirportIdent: KSLNServes: Salina
- Salinas Municipal AirportIdent: KSNSServes: Salinas
- Saline County Regional AirportIdent: KSUZServes: Bryant
- Salisbury Ocean City Wicomico Regional AirportIdent: KSBYServes: Salisbury
- San Angelo Regional Mathis FieldIdent: KSJTServes: San Angelo
- San Carlos AirportIdent: KSQLServes: San Carlos
- San Luis County Regional AirportIdent: KSBPServes: San Luis Obispo
- San Luis Valley Regional Airport/Bergman FieldIdent: KALSServes: Alamosa
- San Marcos Regional AirportIdent: KHYIServes: San Marcos
- Sand Point AirportIdent: PASDServes: Sand Point
- Santa Barbara Municipal AirportIdent: KSBAServes: Santa Barbara
- Santa Fe Municipal AirportIdent: KSAFServes: Santa Fe
- Santa Maria Public Airport Captain G Allan Hancock FieldIdent: KSMXServes: Santa Maria
- Santa Monica Municipal AirportIdent: KSMOServes: Santa Monica
- Savoonga AirportIdent: PASAServes: Savoonga
- Sawyer County AirportIdent: KHYRServes: Hayward
- Schenectady County AirportIdent: KSCHServes: Schenectady
- Scholes International At Galveston AirportIdent: KGLSServes: Galveston
- Scott AFB/Midamerica AirportIdent: KBLVServes: Belleville
- Seattle Paine Field International AirportIdent: KPAEServes: Everett
- Selfridge Air National Guard Base AirportIdent: KMTCServes: Mount Clemens
- Seward AirportIdent: PAWDServes: Seward
- Seymour Johnson Air Force BaseIdent: KGSBServes: Goldsboro
- Shaw Air Force BaseIdent: KSSCServes: Sumter
- Shelby County AirportIdent: KEETServes: Alabaster
- Shenandoah Valley Regional AirportIdent: KSHDServes: Weyers Cave
- Sheridan County AirportIdent: KSHRServes: Sheridan
- Show Low Regional AirportIdent: KSOWServes: Show Low
- Shreveport Regional AirportIdent: KSHVServes: Shreveport
- Sidney - Richland Regional AirportIdent: KSDYServes: Sidney
- Sidney Municipal Airport Lloyd W Carr FieldIdent: KSNYServes: Sidney
- Sierra Blanca Regional AirportIdent: KSRRServes: Alto
- Sierra Vista Municipal Airport / Libby Army Air FieldIdent: KFHUServes: Fort Huachuca / Sierra Vista
- Simmons Army Air FieldIdent: KFBGServes: Fort Bragg
- Sioux Falls Regional AirportIdent: KFSDServes: Sioux Falls
- Sioux Gateway Airport / Brigadier General Bud Day FieldIdent: KSUXServes: Sioux City
- Sitka Rocky Gutierrez AirportIdent: PASIServes: Sitka
- Smith Reynolds AirportIdent: KINTServes: Winston Salem