- Strip in the Woods AirportIdent: 18NYServes: Woodstock
- Striplin AirfieldIdent: AL62Serves: Hartford
- Strizki UltralightportIdent: PA19Serves: Elkdale
- Stro's AirportIdent: AK54Serves: Wasilla
- Strohmier AirportIdent: PN53Serves: Loretto
- Strom Private AirportIdent: 6NA0Serves: Columbus
- Stronghold AirportIdent: 09AZServes: St David
- Strother FieldIdent: KWLDServes: Winfield / Arkansas City
- Strouckel Farm AirportIdent: US-8317Serves: Roscoe
- Stroud Municipal AirportIdent: KSUDServes: Stroud
- Stuart AirstripIdent: LA51Serves: Coushatta
- Stuart Atkinson Municipal AirportIdent: K8V2Serves: Atkinson
- Stuart Island AirparkIdent: 7WA5Serves: Friday Harbor
- Stuart Island West AirportIdent: 2WA3Serves: Friday Harbor
- Stuart Powell FieldIdent: KDVKServes: Danville
- Stuart Red House FieldIdent: VG67Serves: Appomattox
- Stuber Flying Ranch AirportIdent: 2KS2Serves: Severy
- Stuhlmiller FieldIdent: US-12709Serves: Alliance
- Stupek Farms AirportIdent: 8WI8Serves: Fennimore
- Sturdy Oak Farm AirportIdent: AL33Serves: Perdido
- Sturgis Municipal AirportIdent: K49BServes: Sturgis
- Sturgis Municipal AirportIdent: KTWTServes: Sturgis
- Stuttgart Municipal Airport / Carl Humphrey FieldIdent: KSGTServes: Stuttgart
- Stutzke AirportIdent: LL38Serves: Sterling
- Sudan AirportIdent: 9XS6Serves: Sudan
- Sudbury AirportIdent: MA70Serves: Sudbury
- Sue Rock International AirportIdent: IS93Serves: Rock City
- Suffolk Executive AirportIdent: KSFQServes: Suffolk
- Sugar Branch AirportIdent: MU32Serves: Columbia
- Sugar Creek Air ParkIdent: II13Serves: Markleville
- Sugar Creek FieldIdent: 39TTServes: Cleburne
- Sugar Grove AirportIdent: 38TNServes: Westmoreland
- Sugar Hill AirportIdent: DE17Serves: Greenwood
- Sugar Loaf Shores AirportIdent: 7FA1Serves: Key West
- Sugar Ridge AirportIdent: WS62Serves: Verona
- Sugar Springs AirparkIdent: 0MI1Serves: Gladwin
- Sugar Valley AirportIdent: 31AServes: Mocksville
- Sugarloaf Regional AirportIdent: KB21Serves: Carrabassett
- Suggs FieldIdent: 18NRServes: Kinston
- Sullivan AirportIdent: 31WIServes: Sullivan
- Sullivan AirportIdent: 39LLServes: Hamilton
- Sullivan County AirportIdent: KSIVServes: Sullivan
- Sullivan County International AirportIdent: KMSVServes: Monticello
- Sullivan Lake State AirportIdent: 09SServes: Metaline Falls
- Sullivan Regional AirportIdent: KUUVServes: Sullivan
- Sully Municipal AirportIdent: 8C2Serves: Sully
- Sulphur Creek Ranch AirportIdent: ID74Serves: Cascade
- Sulphur Municipal AirportIdent: KF30Serves: Sulphur
- Sulphur Springs Municipal AirportIdent: KSLRServes: Sulphur Springs
- Sumers AirparkIdent: KGWSServes: Glenwood Springs
- Summer Hill Farm AirportIdent: 09NEServes: Bennington
- Summerdale Naval Outlying FieldIdent: KNFDServes: Summerdale
- Summerell AirportIdent: 1LS8Serves: Ferriday
- Summerland Key Cove AirportIdent: FD51Serves: Summerland Key
- Summersville AirportIdent: KSXLServes: Mount Lookout
- Summerville AirportIdent: KDYBServes: Summerville
- Summit AirportIdent: 6VA4Serves: Salem
- Summit AirportIdent: KEVYServes: Middletown
- Summit AirportIdent: PASTServes: Cantwell
- Summit Ridge Ranch AirstripIdent: ID95Serves: Horseshoe Bend