KPHN · St Clair County International Airport

PORT HURON, MICHIGAN · SMALL AIRPORT

650

Elevation ft

Runways

5,104

Longest ft · 04/22

42.91N

82.53W

St Clair County International Airport serves Port Huron, Michigan at 650 ft elevation with its longest runway, 04/22, at 5,104 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.

Open KPHN in JetDesk: live METAR, TAF, winds and runway verdict →

01Runways

Runway	Length × width	Surface	Lighting
04/22	5,104 × 100 ft	asphalt	lit
10/28	4,000 × 75 ft	asphalt	lit

02Density altitude and turboprop runway margins

Standard temperature at 650 ft is about 14°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, 14°C)	650 ft	2,565 ft	2,179 ft	3,268 ft
Warm day (ISA +10)	1,850 ft	2,799 ft	2,305 ft	3,458 ft
Hot day (ISA +20)	3,050 ft	3,033 ft	2,432 ft	3,648 ft
35°C afternoon	3,206 ft	3,063 ft	2,448 ft	3,672 ft

Planning aid only. Even on a 35°C afternoon the longest runway (04/22, 5,104 ft) covers a Meridian-class turboprop's landing distance with a 50 percent margin (3,672 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 KPHN is high, or as the longer runway on a hot afternoon.

Airport	Distance	Longest runway
KDET Coleman A. Young Municipal Airport	37 nm SW	5,092 ft
KPTK Oakland County International Airport	42 nm W	6,521 ft
KFNT Bishop International Airport	53 nm W	7,852 ft
KDTW Detroit Metropolitan Wayne County Airport	56 nm SW	12,003 ft
KBAX Huron County Memorial Airport	56 nm N	5,000 ft

04Jet A prices and FBOs at KPHN

No public API publishes FBO fuel prices, so JetDesk does not guess. Pilots and crews log the price they actually paid at KPHN, 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 KPHN or read what a fuel stop actually saves.

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