- Sodbuster StripIdent: US-4488Serves: Goodhue
- Soderquist AirportIdent: 2NA0Serves: Wilton
- Soggy Bottom AirportIdent: 2TN8Serves: Dowelltown
- Soggy Bottom Farm AirportIdent: US-12840Serves: Winchester
- Soldier Meadow Number 1 AirportIdent: NV06Serves: Gerlach
- Soldier Meadow Number 2 AirportIdent: NV05Serves: Gerlach
- Solenberg AirportIdent: II97Serves: Shelbyville
- Solitude AirstripIdent: 21LSServes: St Francisville
- Solly's Strip UltralightportIdent: IA44Serves: Lamoni
- Solo Ranch AirportIdent: NM08Serves: Deming
- Solomon State FieldIdent: AK26Serves: Solomon
- Solomon Valley AirparkIdent: SN09Serves: Minneapolis
- Solon Springs Municipal AirportIdent: KOLGServes: Solon Springs
- Soloy StripIdent: 87AKServes: Wasilla
- Solt FieldIdent: 9PA5Serves: Leighton
- Soltis FieldIdent: 75OIServes: Marion
- Someday Ranch AirportIdent: 2XA5Serves: Lockhart
- Someday Ranch AirportIdent: MU24Serves: Cedarcreek
- Somers Lane AirportIdent: US-5174Serves: Ashley
- Somerset AirportIdent: KSMQServes: Somerville
- Somerset County AirportIdent: K2G9Serves: Somerset
- Somerton AirportIdent: 54AZServes: Somerton
- Somerville AirportIdent: 2MI5Serves: Ada
- Sommers AirportIdent: II79Serves: Winamac
- Sommerset StripIdent: AL89Serves: Opelika
- Songbird Ranch AirportIdent: 91TSServes: Rosharon
- Songer AirportIdent: IN55Serves: Veedersburg
- Songlo Vista AirportIdent: 3AK3Serves: Talkeetna
- Sonoma Skypark AirportIdent: 0Q9Serves: Sonoma
- Sonoma Valley AirportIdent: 0Q3Serves: Schellville/Sonoma
- Sons Private-Commercial AirportIdent: 47MNServes: Norwood Young America
- Sooter AirportIdent: 12KSServes: Sedgwick
- Sopwith Farm AirportIdent: 27CLServes: Pleasant Grove
- Sopwith LandingIdent: US-8430Serves: Lexington
- Sorenson AirportIdent: 13MTServes: Kremlin
- Sorlie AirportIdent: 0NA5Serves: Maddock
- Sorrell AirportIdent: 59WAServes: Tenino
- Sossamon Field (Unused)Ident: 57NCServes: Bryson City
- Sourdough AirportIdent: 5WA0Serves: Tonasket
- South 80 FieldIdent: 2IA9Serves: Crystal Lake
- South Albany AirportIdent: 4B0Serves: South Bethlehem
- South Big Horn County AirportIdent: KGEYServes: Greybull
- South Boulder AirportIdent: 2MT8Serves: Cardwell
- South Dayton AirportIdent: NY27Serves: South Dayton
- South Farm AirportIdent: US-0691Serves: Hydro
- South Fork FieldIdent: US-6961Serves: Marion
- South Fork Ranch AirportIdent: 0ID0Serves: Featherville
- South Fox Island AirportIdent: 3MI2Serves: Northport
- South Gasline AirportIdent: AK39Serves: Sterling
- South Grand Lake Regional AirportIdent: 1K8Serves: Ketchum
- South Haven Area Regional AirportIdent: KLWAServes: South Haven
- South Hollywood AirportIdent: 67AKServes: Wasilla
- South Jersey Regional AirportIdent: KVAYServes: Lumberton
- South Lafourche Leonard Miller Jr AirportIdent: KGAOServes: Galliano
- South Lakeland AirportIdent: KX49Serves: Lakeland
- South Naknek Number 2 AirportIdent: PFWSServes: South Naknek
- South One Ten AirportIdent: 1GA8Serves: Nashville
- South Point AirportIdent: 95FDServes: La Belle
- South River AirportIdent: NC93Serves: Salisbury
- South St Paul Municipal Airport/Richard E Fleming FieldIdent: KSGSServes: South St Paul