Reference only — not for real-world navigation.
KHYI
San Marcos Regional Airport · San Marcos
Key Facts
Essential technical summary for MSFS 2020/2024 and X-Plane.
ILS Approach StatusILS FREQUENCIES VERIFIED ✅
Field Elevation
597 ft / 182 m
Transition Altitude
18,000 ft
Primary Channel
A/D 119.00 MHz (AUSTIN APP/DEP)
Live Conversion
inHg
hPa
Runway Summary (Quick-Links)
08/26 · 6,330 ft · AsphaltLIGHTED13/31 · 5,603 ft · AsphaltLIGHTED17/35 · 5,213 ft · AsphaltLIGHTEDFlight Planning
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Welcome to the technical flight briefing for San Marcos Regional Airport (KHYI), located in San Marcos, United States. As a vital hub for Microsoft Flight Simulator 2024, MSFS 2020, and X-Plane pilots, this facility features 3 active runways with a maximum elevation of 597 ft. Instrument approaches (IFR) are supported with verified ILS frequencies and identifiers for precision landings.Reference the data below for primary communication channels and detailed runway characteristics. Pilots should observe a Transition Altitude of 18,000 ft verified for this field for altimeter reset procedures.
Full Name
San Marcos Regional Airport
ICAO / IATA
KHYI / —
Municipality
San Marcos
Country
Region
US-TX — Texas
GPS Coordinates
Transition Altitude
18,000 ft
Elevation
597 ft
Wikipedia
Pilot Toolbox
External charts, live tracking and weather reports.
Runway 08 / 26
LIGHTED
Runway Length: 6,330 ft / 1,929 m
Runway Width: 100 ft / 30 m
Surface Type: Asphalt
Heading: 87.8° / 267.8°
Runway Width: 100 ft / 30 m
Surface Type: Asphalt
Heading: 87.8° / 267.8°
RWY 08 (87.8°)
No ILS / Visual Only
RWY 26 (267.8°)
No ILS / Visual Only
Runway 13 / 31
ILS EQUIPPEDLIGHTED
Runway Length: 5,603 ft / 1,708 m
Runway Width: 150 ft / 46 m
Surface Type: Asphalt
Heading: 132.9° / 312.9°
Runway Width: 150 ft / 46 m
Surface Type: Asphalt
Heading: 132.9° / 312.9°
RWY 13 (132.9°)
108.70 MHz
IDENT: RUM | CRS: 126°
RWY 31 (312.9°)
No ILS / Visual Only
Runway 17 / 35
LIGHTED
Runway Length: 5,213 ft / 1,589 m
Runway Width: 100 ft / 30 m
Surface Type: Asphalt
Heading: 177.9° / 357.9°
Runway Width: 100 ft / 30 m
Surface Type: Asphalt
Heading: 177.9° / 357.9°
RWY 17 (177.9°)
No ILS / Visual Only
RWY 35 (357.9°)
No ILS / Visual Only
A/D AUSTIN APP/DEP
119.00 MHz
AWOS AWOS 3
120.83 MHz
CLD CLNC DEL
121.35 MHz
UNIC CTAF/UNICOM
123.05 MHz
Base Airport Data: OurAirports (Public Domain)
Instrument Approach Data: FAA NASR · Cycle: Jan 2026