KMTH · Florida Keys Marathon International Airport

MARATHON, FLORIDA · MEDIUM AIRPORT

Elevation ft

Runway

5,008

Longest ft · 07/25

24.73N

81.05W

Florida Keys Marathon International Airport serves Marathon, Florida at 5 ft elevation with its longest runway, 07/25, at 5,008 by 100 ft. The figures below are computed from FAA NASR runway data (via OurAirports) and the same rules of thumb JetDesk uses on the airport page in the app; the POH and current NOTAMs are the authority.

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01Runways

Runway	Length × width	Surface	Lighting
07/25	5,008 × 100 ft	asphalt	lit

02Density altitude and turboprop runway margins

Standard temperature at 5 ft is about 15°C. Every 1,000 ft of density altitude adds roughly 8 percent to a turboprop's takeoff distance and 5 percent to its landing distance. The table uses Piper Meridian book numbers (2,438 ft takeoff and 2,110 ft landing over a 50 ft obstacle at sea level, ISA, max weight) as a reference airplane; heavier turboprops and light jets scale the same way from their own POH figures.

Conditions	Density altitude	Takeoff est.	Landing est.	Landing × 1.5
Standard day (ISA, 15°C)	5 ft	2,439 ft	2,111 ft	3,166 ft
Warm day (ISA +10)	1,205 ft	2,673 ft	2,237 ft	3,356 ft
Hot day (ISA +20)	2,405 ft	2,907 ft	2,364 ft	3,546 ft
35°C afternoon	2,406 ft	2,907 ft	2,364 ft	3,546 ft

Planning aid only. Even on a 35°C afternoon the longest runway (07/25, 5,008 ft) covers a Meridian-class turboprop's landing distance with a 50 percent margin (3,546 ft needed). The percentages are a generic rule of thumb applied to one reference airplane, not certified performance data for any specific aircraft, and the runway size categories describe the runway, not your airplane's suitability. Verify with the approved flight manual before every flight.

03Nearby fields with 5,000 ft or more

Useful as alternates, as fuel stops when the price at KMTH is high, or as the longer runway on a hot afternoon.

Airport	Distance	Longest runway
KEYW Key West International Airport	40 nm W	5,076 ft
KTMB Miami Executive Airport	65 nm NE	6,000 ft
KTNT Dade Collier Training and Transition Airport	69 nm N	10,499 ft
KMIA Miami International Airport	76 nm NE	13,016 ft

04Jet A prices and FBOs at KMTH

No public API publishes FBO fuel prices, so JetDesk does not guess. Pilots and crews log the price they actually paid at KMTH, the app flags a price stale after two weeks, and the route finder ranks every field within a corridor of your route by net savings after the cost of the extra cycle. Log a price at KMTH or read what a fuel stop actually saves.

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