Caledonia County Airport (IATA: LLX, ICAO: KCDA, FAA LID: CDA, formerly 6B8) is a state-owned public-use airport located three nautical miles (6 km) north of the central business district of Lyndonville, a village in Caledonia County, Vermont, United States. It is also known as Caledonia County State Airport.

Although most U.S. airports use the same three-letter location identifier for the FAA and IATA, this airport is assigned CDA by the FAA and LLX by the IATA (which assigned CDA to Cooinda, Northern Territory, Australia).