KMTH is the ICAO code for The Florida Keys Marathon Airport (IATA MTH), located in Marathon, FL.
The Florida Keys Marathon Airport (KMTH) is a medium airport in Marathon, FL. Pilots and dispatchers reference it by ICAO code KMTH or IATA code MTH. It sits in North America.
The Florida Keys Marathon Airport is a regional airport primarily serving general aviation, charter, and corporate flight departments. The 5,008-foot runway means it is well-suited as a dedicated bizjet field, free from airline scheduling pressure.
The longest runway measures 5,008 ft (1,526 m), a light-jet-class field. Representative aircraft that operate comfortably here include the Phenom 300, Citation CJ4, and Learjet 75. In practice this limits operations to light jets, turboprops, and short-field-capable aircraft.
The Florida Keys Marathon Airport sits near sea level at 5 ft.
Local operations run on America/New_York. Without scheduled airline traffic, the field tends to be quieter and more flexible for charter and corporate operations — a useful characteristic for early morning, late night, or short-notice flights that would be impractical at a hub.
SkyAccess currently tracks 153 departing and 186 arriving private-jet legs at KMTH across the next six months of operator inventory. 11 charter operators have run trips through this field in our recent inventory window.
Regional fields like KMTH are a meaningful share of US private aviation — closer to the trip's actual origin or destination than the nearest major hub, with shorter ramp-to-cabin times that are the main reason owners and brokers prefer them.