| KKK | - | Kalakaket Creek Air Station | Kalakaket | |
| - | - | Kalispell City | Kalispell | |
| - | - | Kalkaska City | Kalkaska | |
| - | - | Kamiah Municipal | Kamiah | |
| - | - | Kamp | Durhamville | |
| - | - | Kampel | Wellsville | |
| KNB | KKNB | Kanab Airport | Kanab | |
| - | - | Kankakee | Kankakee | |
| - | - | Kantishna | Kantishna | |
| - | KOKZ | Kaolin | Sandersville | |
| - | - | Kapaun-Wilson | Graceville | |
| - | - | Karlstad Municipal | Karlstad | |
| - | - | Karnes Co | Kenedy | |
| - | - | Kasilof | Kasilof | |
| - | - | Katama | Edgartown | |
| - | - | Kearny | Kearny | |
| - | - | Keck'S | Julian | |
| - | - | Kee | Pineville | |
| BIX | KBIX | Keesler Air Force Base | Biloxi | |
| CKA | KCKA | Kegelman Air Field | Cherokee | |
| - | - | Kellam | Weirwood | |
| - | - | Keller Brothers Airport | Lebanon | |
| - | - | Kelleys Island Land Field | Kelleys Island | |
| - | - | Kelly | Oak Grove | |
| KLP | - | Kelp Bay Airport | Kelp Bay | |
| EMM | KEMM | Kemmerer Airport | Kemmerer | |
| - | - | Kendallville Municipal | Kendallville | |
| - | - | Kenmare Municipal | Kenmare | |
| KNT | KTKX | Kennett Municipal Airport | Kennett | |
| - | - | Kent Co | Jayton | |
| - | - | Kent State University Airport | Kent | |
| KKT | - | Kentland Airport | Kentland | |
| - | - | Kentmorr | Stevensville | |
| - | - | Kentucky Dam State Park | Gilbertsville | |
| EOK | KEOK | Keokuk Airport | Keokuk | |
| - | - | Keosauqua Municipal | Keosauqua | |
| TSP | KTSP | Kern County Airport | Tehachapi | |
| - | - | Kern Valley | Kernville | |
| - | - | Kestrel | San Antonio | |
| WFB | - | Ketchikan Harbor Sea Plane Base | Ketchikan | |
| - | KEZI | Kewanee Municipal | Kewanee | |
| - | - | Keystone | Keystone Heights | |
| - | - | Keystone | Westport | |
| - | - | Keystone | Unionville | |
| - | - | Kibs | Bristol | |
| KIP | - | Kickapoo Airport | Wichita Falls | |
| - | - | Kidwell | Cal Nev Ari | |
| - | - | Kimball Municipal | Kimball | |
| - | KIBM | Kimball Municipal/Arraj | Kimball | |
| JCT | KJCT | Kimble County Airport | Junction | |