Marathon, Florida
KMTH The Florida Keys Marathon Intl
The Florida Keys Marathon Intl (KMTH) is a non-towered, public-use airport in Marathon, Florida, at 7.3 ft MSL. Its runway is 07/25 (5,008 by 100 ft, asphalt). CTAF 122.975.
FAA NASR data effective Oct 29, 2026. Not for navigation; verify with current FAA charts and the Chart Supplement.
Airport
At a glance
- Identifiers
- ICAO KMTH, FAA MTH
- Location
- Marathon, Florida (Monroe County). 3 NM E of the city center
- Elevation
- 7.3 ft MSL
- Position
- 24.7263° N, 81.0514° W
- Control tower
- No, non-towered
- Sectional chart
- Miami
- Magnetic variation
- 4° W (2000)
- Fuel
- 100LL, Jet A-1+
- Ownership
- Publicly owned, open to the public
- Attendance
- Daily 0800-1800
1 runway
Runways
| Runway | Length × width | Surface | Edge lights |
|---|---|---|---|
| 07/25 | 5,008 × 100 ft | Asphalt, excellent condition | Medium intensity |
Runway ends and traffic pattern
| End | Pattern | Glide slope lights | Instrument | Displaced threshold | Landing distance |
|---|---|---|---|---|---|
| 07 | Left traffic | 4-light PAPI, left | None listed | None listed | 5,008 ft |
| 25 | Left traffic | 4-light PAPI, left | None listed | None listed | 5,008 ft |
VHF
Frequencies
- CTAF
- 122.975
- Actvt Reil Rwy 07; Papi Rwy 07 & 25; Mirl Rwy 07/25 - Ctaf.
- UNICOM
- 122.975
Weather station
- ASOS MTH
- 135.525
Before you go
Brief KMTH in Ascent EFB.
Current weather, NOTAMs and the airport diagram for The Florida Keys Marathon Intl, in the app on iPhone and iPad.
Not for navigation. Verify with current FAA charts and the Chart Supplement before flight.
Source: FAA NASR 28-day subscription, cycle effective Oct 29, 2026. Airport data changes every 28 days and NOTAMs can override it at any time.