- St John Homestead AirportIdent: 4AK2Serves: Wasilla
- St Johns Industrial Air ParkIdent: KSJNServes: St Johns
- St Landry Parish Ahart FieldIdent: KOPLServes: Opelousas
- St Louis Downtown AirportIdent: KCPSServes: Cahokia/St Louis
- St Louis Metro-East Airport/Shafer FieldIdent: K3K6Serves: St Jacob
- St Mary's AirportIdent: PASMServes: St Mary's
- St Marys AirportIdent: K4J6Serves: St Marys
- St Marys Municipal AirportIdent: KOYMServes: St Marys
- St Michael AirportIdent: PAMKServes: St Michael
- St Thomas Municipal AirportIdent: 4S5Serves: St Thomas
- St. Joseph's Landing AirportIdent: 91KSServes: Saint Marys
- St. Mathews AirportIdent: 99SCServes: St. Mathews
- St. Somewhere AirportIdent: 6TN7Serves: Grand Junction
- St. Tammany Regional AirportIdent: KL31Serves: Covington
- Stacey's AirportIdent: WA42Serves: Port Townsend
- Stafford AirportIdent: 20NYServes: Le Roy
- Stafford AirportIdent: GA20Serves: Saint Marys
- Stafford Municipal AirportIdent: 3TAServes: Stafford
- Stafford Regional AirportIdent: KRMNServes: Fredericksburg
- Stag Air ParkIdent: 7NC1Serves: Burgaw
- Stage Coach Hills AirportIdent: 4TX2Serves: Keller
- Stagecoach AirportIdent: US-1114Serves: Adair
- Stahl's Mountain AirportIdent: 3PN7Serves: Union Dale
- Stallions AirportIdent: 07WYServes: Sheridan
- Stambaugh AirportIdent: Y73Serves: Iron River
- Stampede AirportIdent: Z90Serves: Kantishna
- Stampede Valley AirportIdent: 6TS4Serves: Moffat
- Stamps FieldIdent: 3TE5Serves: Panhandle
- Stan Jost AirportIdent: 74ORServes: Newberg
- Stan Stamper Municipal AirportIdent: KHHWServes: Hugo
- Stanchester AirportIdent: 0FL6Serves: Lithia
- Standard FieldIdent: 5KY4Serves: Elkton
- Standing Rock AirportIdent: KY27Serves: Fort Yates
- Stanford FieldIdent: KU12Serves: St Anthony
- Stanger To Blue Waters Ultralight FlightparkIdent: WV95Serves: Fayetteville
- Stangl AirportIdent: 16IAServes: Coon Rapids
- Stangland AirportIdent: 5IN9Serves: Wolflake
- Stanly County AirportIdent: KVUJServes: Albemarle
- Stanton AirfieldIdent: KSYNServes: Dennison
- Stanton AirportIdent: 91ISServes: Riverton
- Stanton AirportIdent: KI50Serves: Stanton
- Stanton AirportIdent: NY35Serves: New Paltz
- Stanton County Municipal AirportIdent: K2K3Serves: Johnson City
- Stanton Municipal AirportIdent: K63FServes: Stanton
- Stanwix Heights AirportIdent: 5NY4Serves: Rome
- Staples Municipal AirportIdent: KSAZServes: Staples
- Stapleton FieldIdent: TX03Serves: Abbott
- Star City Municipal AirportIdent: K55MServes: Star City
- Star Dusters AirportIdent: 8TA9Serves: Washington
- Star FieldIdent: US-6671Serves: Rising Star
- Star Hill Golf Club AirportIdent: 60NCServes: Cape Carteret
- Star K Ranch AirportIdent: 99TTServes: Agua Nueva
- Star S Ranch AirportIdent: ID56Serves: Mackay
- Star Smith FieldIdent: 3XS5Serves: Von Ormy
- Star Valley Ranch AirportIdent: WY39Serves: Thayne
- Starbase AirportIdent: VG09Serves: Cape Charles
- Starbuck Municipal AirportIdent: D32Serves: Starbuck
- Stark AirportIdent: MU18Serves: Warrenton
- Stark FieldIdent: 91XSServes: Merkel
- Stark's Twin Oaks AirparkIdent: 7S3Serves: Hillsboro