- K Ranch AirportIdent: 3TE0Serves: Iola
- K Star Ranch AirportIdent: 49TEServes: Brenham
- K-John AirportIdent: US-0588Serves: Crowley
- K2 AirportIdent: US-5186Serves: Echo
- Kachemak LandingIdent: US-6929Serves: Homer
- Kadoka Municipal AirportIdent: 5V8Serves: Kadoka
- Kahoka Municipal AirportIdent: 0H7Serves: Kahoka
- Kahuna Bay AirportIdent: 1TE8Serves: Sherman
- Kaiser's AirstripIdent: MY29Serves: Lake Park
- Kako AirportIdent: 9AK2Serves: Russian Mission
- Kalakaket Creek AS AirportIdent: 1KCServes: Kalakaket Creek
- Kalaupapa AirportIdent: PHLUServes: Kalaupapa
- Kalberer AirportIdent: 16NDServes: Bismarck
- Kalifornsky Meadows AirportIdent: 0AA7Serves: Kenai
- Kalispell City AirportIdent: KS27Serves: Kalispell
- Kallander FieldIdent: 09MAServes: Southborough
- Kalmbach AirportIdent: 43AKServes: Wasilla
- Kalskag AirportIdent: PALGServes: Kalskag
- Kalt Ranch AirportIdent: 9TE5Serves: Fulton
- Kaltag AirportIdent: PAKVServes: Kaltag
- Kamiah Municipal AirportIdent: KS73Serves: Kamiah
- Kaml AirstripIdent: 45MNServes: Euclid
- Kampel AirportIdent: 2N5Serves: Wellsville
- Kanab Municipal AirportIdent: KKNBServes: Kanab
- Kantishna AirportIdent: 5Z5Serves: Kantishna
- Kaolin FieldIdent: KOKZServes: Sandersville
- Kapaun-Wilson FieldIdent: 4MN5Serves: Graceville
- Kapowsin FieldIdent: 86WAServes: Graham
- Kari FieldIdent: WN36Serves: Olympia
- Karlindo AirportIdent: 3PN2Serves: Fairfield
- Karlstad Municipal AirportIdent: 23DServes: Karlstad
- Karluk AirportIdent: PAKYServes: Karluk
- Karpens AirportIdent: OR23Serves: Astoria
- Kasigluk AirportIdent: PFKAServes: Kasigluk
- Kasilof AirportIdent: 5KSServes: Kasilof
- Kastanek AirportIdent: MY15Serves: Pierz
- Katama AirparkIdent: K1B2Serves: Edgartown
- Kathamel AirportIdent: US-9148Serves: Versailles
- Katheryn's Landing AirportIdent: AR81Serves: Leola
- Katmai Lodge AirportIdent: 00ANServes: King Salmon
- Kauffman Airfield Ultralight FlightparkIdent: US-5648Serves: Fairview
- Kaufield AirportIdent: 0LL0Serves: Belvidere
- Kawaihapai AirfieldIdent: PHDHServes: Mokuleia
- Kay Air AirportIdent: 20IIServes: Mooresville
- Kay FieldIdent: 61IIServes: Wolflake
- Kay Ranch AirportIdent: TA61Serves: Winona
- Kaypod AirportIdent: SN70Serves: Harper
- Kayutah Lake/James & Helene D Allen Memorial AirportIdent: 2NY9Serves: Alpine
- Kearny AirportIdent: KE67Serves: Kearny
- Kecks AirportIdent: N88Serves: Julian
- Keeven Air Ranch AirportIdent: MO93Serves: Hawk Point
- Kegelman AF Aux FieldIdent: KCKAServes: Cherokee
- Keil AirportIdent: 6IL5Serves: Dongola
- Kelch AirportIdent: 59OHServes: Bethel
- Kelgun AirportIdent: 4CO8Serves: Castle Rock
- Kellachows AirportIdent: PA54Serves: Carbondale
- Keller AirfieldIdent: 5AR7Serves: Weiner
- Keller Brothers AirportIdent: 08NServes: Lebanon
- Kelley Crop Service AirportIdent: 7TE0Serves: Fannett
- Kelleys AirportIdent: 0MI3Serves: Grayling