Reference only — not for real-world navigation.
KMTH
The Florida Keys Marathon Airport · Marathon
Key Facts
Essential technical summary for MSFS 2020/2024 and X-Plane.
ILS Approach StatusILS DATA NOT IN DATABASE
Field Elevation
5 ft / 2 m
Transition Altitude
18,000 ft
Primary Channel
RDO 122.60 MHz (MIAMI RDO)
Live Conversion
inHg
hPa
Runway Summary (Quick-Links)
07/25 · 5,008 ft · AsphaltLIGHTEDFlight Planning
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Welcome to the technical flight briefing for The Florida Keys Marathon Airport (KMTH), located in Marathon, United States. As a vital hub for Microsoft Flight Simulator 2024, MSFS 2020, and X-Plane pilots, this facility features 1 active runway with a maximum elevation of 5 ft. Please note that this field primarily supports VFR and visual approach procedures.Reference the data below for primary communication channels and detailed runway characteristics. Pilots should observe a Transition Altitude of 18,000 ft verified for this field for altimeter reset procedures.
Full Name
The Florida Keys Marathon Airport
ICAO / IATA
KMTH / MTH
Municipality
Marathon
Country
Region
US-FL — Florida
GPS Coordinates
Transition Altitude
18,000 ft
Elevation
5 ft
Official Website
Wikipedia
Pilot Toolbox
External charts, live tracking and weather reports.
Runway 07 / 25
LIGHTED
Runway Length: 5,008 ft / 1,526 m
Runway Width: 100 ft / 30 m
Surface Type: Asphalt
Heading: 67° / 247°
Runway Width: 100 ft / 30 m
Surface Type: Asphalt
Heading: 67° / 247°
RWY 07 (67°)
No ILS / Visual Only
RWY 25 (247°)
No ILS / Visual Only
ASOS ASOS
135.53 MHz
CNTR MIAMI CNTR
133.50 MHz
RDO MIAMI RDO
122.60 MHz
UNIC CTAF/UNICOM
122.80 MHz
Base Airport Data: OurAirports (Public Domain)
Instrument Approach Data: AIP 2026 Researched · Cycle: Jan 2026