The Florida Keys Marathon International (KMTH), Florida
Landing essentials
Whether you can land, whether you can refuel, and how customs works here.
Overview
The Florida Keys Marathon International (KMTH) is a single-runway, non-towered airport serving Marathon, Florida, roughly 84 nautical miles from the nearest major metro area. It handles business aviation traffic alongside general airport operations and provides onsite CBP inspection services along with a USDA compliance agreement, making it a functional international arrival point in the Keys. The nearest comparable airports, Key West NAS at Boca Chica Field and Key West International, both lie about 36 to 40 nautical miles to the west.
Runways
The Florida Keys Marathon International has one paved runway, 07/25, 5,008 ft long and 100 ft wide, with an asphalt surface.
Runway geometry from published threshold coordinates. Not for navigation.
Source: FAA Form 5010.
Fuel and airfield services
The Florida Keys Marathon International has Jet A1+ and 100LL available on the field. Fueling is available from 8am to 6pm, daily, and the airport has no control tower.
Source: FAA Form 5010 / NASR.
Customs
The Florida Keys Marathon International has US Customs and Border Protection clearance available onsite, with general clearance for international arrivals. A USDA compliance agreement is in place.
Source: CBP list of ports of entry.
Business aviation traffic
The Florida Keys Marathon International recorded 9,152 business aviation movements in 2025. Traffic peaks in March. Business aviation traffic at KMTH is concentrated in the winter and early spring months, with a sharp drop in September according to the traffic data.
Business jet movements, FAA TFMSC count. Peak month March, 1,165 movements in 2025.
Source: FAA TFMSC, business jet movements, 2025.
Climate
The Florida Keys Marathon International averages 27.4 days above 90°F in August. August is the warmest month, with average highs of 91.6°F, and January the coldest, at 75.8°F.
Weather station is on the field. Some values are estimated by the agency. 1991–2020 climate normals.
Source: NOAA NCEI.
Operating constraints
The Florida Keys Marathon International has published operating constraints in six categories: access, runway notes, noise procedures, environmental, pavement strength and other notes.
The USCBP user fee facility is open Thursday through Monday, 0900 to 1730. It is closed to arrivals on Tuesday and Wednesday except by request and approval from USCBP. Contact USCBP. See special notices for the U.S. special customs requirement.
Prior permission is required, requested 24 hours in advance, for aircraft equipped with weather modification or geoengineering equipment.
Pilot-controlled lighting: REIL for runway 07, PAPI for both runway 07 and runway 25, and MIRL for runway 07/25, all activated via CTAF.
Aircraft must use taxiway A4 to access runway 25 for a full-length departure. No runway access is available beyond taxiway A4.
The airport is located in a noise-sensitive area. NBAA noise abatement procedures are required. Local ordinance requires that engine runups be conducted in a designated area on the commercial or FBO ramp between 2300 and 0700, with fines for noncompliance.
Birds are present on and in the vicinity of the airport.
PCR VALUE: 200/F/A/X/T
After-hours Jet A fuel service is limited.
For clearance delivery, if unable to contact on the FSS frequency, contact Miami ARTCC.
Self-service fuel is available 24 hours a day.
Source: FAA Chart Supplement.
Nearby airfields
The Florida Keys Marathon International has two airfields within 40 NM. The closest is Key West NAS (boca Chica Fld) (KNQX), 35.84 NM west.
Source: Skystar calculation from official coordinates.
Skystar at KMTH
We arrange catering, fuel and trip support here. Supplier prices reach you unchanged; our coordination fee sits on its own line.
The same order, priced two ways.
$2,400.00 catering order at KMTH.
Unchanged.
What the kitchen invoices us is what your quote reads.
One line, fixed.
It does not move with the size of the order.
At cost.
Passed on at the exact amount the processor took.
Market practice figures are industry averages, not a specific competitor.
Frequently asked questions
What is the runway configuration at KMTH?
The Florida Keys Marathon International operates a single runway, 07/25, measuring 5,008 feet long and 100 feet wide with an asphalt surface. The pavement is rated PCR VALUE: 200/F / A/X / T. This single-runway layout means wind conditions on either the 07 or 25 heading determine the only available approach and departure direction. Dispatchers should note there is no crosswind runway option at this field. The airport is non-towered, so pilots coordinate on CTAF for sequencing on this runway.
Does KMTH have customs and border clearance available?
The Florida Keys Marathon International has CBP inspection services onsite along with a USDA compliance agreement. The USCBP user fee facility is open Thursday through Monday from 0900 to 1730 local time. The facility is closed to arrivals on Tuesday and Wednesday except by prior request and approval from USCBP. Operators planning international arrivals outside the posted schedule must contact USCBP directly to arrange clearance. This schedule makes early planning important for any trip touching KMTH from outside the United States.
What fuel is available at Marathon International Airport?
Marathon International Airport, KMTH, offers both 100LL and Jet A fuel types. Self-service fuel is available around the clock. After hours, Jet A fuel service is noted as limited according to the field remarks. Operators arriving outside staffed hours should plan around self-service availability rather than assuming full-service support. The field's attendance schedule runs daily from 0800 to 1800 local time.
Are there noise abatement procedures at KMTH?
Yes, The Florida Keys Marathon International is located in a noise-sensitive area and requires use of NBAA noise abatement procedures. A local ordinance also restricts engine runups on commercial or FBO ramps between 2300 and 0700, with fines for violations. Operators should confirm designated runup areas before conducting extended ground checks during those hours. Bird activity has also been reported on and in the vicinity of the airport, which is a separate operational consideration from the noise rules. Both factors are relevant for crews planning ground operations or night departures at this field.
What departure restriction applies to runway 25 at KMTH?
At The Florida Keys Marathon International, aircraft must use taxiway A4 to access runway 25 for a full-length departure. No runway access is available beyond taxiway A4 on that runway. This restricts the usable departure length for aircraft entering from points further down the runway. Crews planning maximum-performance departures on runway 25 need to factor in this taxiway access limitation ahead of time. This is a fixed procedural constraint rather than a temporary condition at KMTH.