KHYI · San Marcos Regional Airport

SAN MARCOS, TEXAS · MEDIUM AIRPORT

597

Elevation ft

Runways

6,330

Longest ft · 08/26

29.89N

97.86W

San Marcos Regional Airport serves San Marcos, Texas at 597 ft elevation with its longest runway, 08/26, at 6,330 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 KHYI in JetDesk: live METAR, TAF, winds and runway verdict →

01Runways

Runway	Length × width	Surface	Lighting
08/26	6,330 × 100 ft	asphalt	lit
13/31	5,601 × 100 ft	asphalt	lit
17/35	5,214 × 100 ft	asphalt	lit

02Density altitude and turboprop runway margins

Standard temperature at 597 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)	597 ft	2,554 ft	2,173 ft	3,259 ft
Warm day (ISA +10)	1,797 ft	2,788 ft	2,300 ft	3,449 ft
Hot day (ISA +20)	2,997 ft	3,023 ft	2,426 ft	3,639 ft
35°C afternoon	3,140 ft	3,050 ft	2,441 ft	3,662 ft

Planning aid only. Even on a 35°C afternoon the longest runway (08/26, 6,330 ft) covers a Meridian-class turboprop's landing distance with a 50 percent margin (3,662 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 KHYI is high, or as the longer runway on a hot afternoon.

Airport	Distance	Longest runway
KBAZ New Braunfels National Airport	15 nm SW	6,503 ft
KAUS Austin Bergstrom International Airport	21 nm NE	12,250 ft
KEDC Austin Executive Airport	34 nm NE	6,025 ft

04Jet A prices and FBOs at KHYI

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

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