San Marcos Regional Airport
Daylight today(Sep 2, 2026, local time)
About 12h 44m of daylight. Civil twilight (dawn/dusk) approximates the FAA definition of night for logging and currency. Times are computed and approximate — verify with official sources.
About San Marcos Regional Airport
San Marcos Regional Airport is a public use airport located in Caldwell County, Texas, United States. It is 4 nmi (7.4 km) east of the central business district of San Marcos, a city that is mostly in Hays County. The airport is owned by the City of San Marcos and operated by Texas Aviation Partners. It is located east of the border of Caldwell County and Hays County. Before it was operated as a civilian airport it was known as Gary Air Force Base.
Summary from Wikipedia, photo via Wikimedia Commons, licensed under CC BY-SA.
Live weather
KHYINOTAMs
KHYIReference only — not an official briefing. Always obtain a certified briefing (e.g. 1800wxbrief.com / your AIS) before flight.
NOTAM data via the FAA NOTAM system.
Live departures & arrivals
Flight data by AeroDataBox. Times are estimates — not for navigation; confirm with the airline.
Where you can fly from here
Current scheduled routes & daily frequency by AeroDataBox. Approximate — confirm bookable schedules with the airline.
Live traffic nearby
Aircraft currently within ~40 nm, from live ADS-B. Positions are approximately real-time — not for navigation.
Live ADS-B by adsb.lol & the OpenSky Network. Not for navigation.
Map
Runway centrelines, navaids and overlapping airspace. Tiles © OpenStreetMap contributors. Reference only — not for navigation.
Runways (3)
| Runway | Length | Width | Surface | Lighting | Status |
|---|---|---|---|---|---|
| 08 / 26 | 6,330 ft / 1,929 m | 100 ft | Asp | Lighted | Open |
| 13 / 31 | 5,601 ft / 1,707 m | 100 ft | Asp | Lighted | Open |
| 17 / 35 | 5,214 ft / 1,589 m | 100 ft | Asp | Lighted | Open |
Radio frequencies (4)
| Type | Description | Frequency |
|---|---|---|
| A/D | AUSTIN APP/DEP | 119.000 MHz |
| AWOS | AWOS 3 | 120.825 MHz |
| CLD | CLNC DEL | 121.350 MHz |
| UNIC | CTAF/UNICOM | 123.050 MHz |
Instrument procedures & charts
Airport diagram (1)
Instrument approaches (4)
Departure procedures (SIDs) (4)
Arrivals (STARs) (4)
Takeoff & alternate minimums (2)
Runway hot spots (1)
Showing 16 of 21 FAA procedures on this overview. Always fly the current, official chart. Full charts page.
Airspace in this area(2)
| Name | Class | Type | Floor | Ceiling |
|---|---|---|---|---|
| AUSTIN CLASS D | Class D | Controlled | GND | 3100 ft MSL |
| AUSTIN CLASS E2 | Class E | Controlled | GND | 3100 ft MSL |
Approximate bounding-box match from OpenAIP · all United States airspace. Reference only — consult official charts for exact boundaries and status.
Tall obstacles nearby
| Obstacle | Height AGL | Top (MSL) | Lit |
|---|---|---|---|
| Obstacle | 259 ft | 853 ft | — |
Tallest obstacles within ~10 nm. Data via OpenAIP. Reference only — consult official charts.
Nearby airports
Great-circle distance and true bearing from San Marcos Regional Airport.
Frequently asked questions
What is the ICAO code for San Marcos Regional Airport?
The ICAO code for San Marcos Regional Airport is KHYI.
Where is San Marcos Regional Airport located?
San Marcos Regional Airport is medium airport located in San Marcos, United States, at an elevation of 597 ft (182 m).
How many runways does San Marcos Regional Airport have?
San Marcos Regional Airport has 3 runways, the longest being 6,330 ft / 1,929 m.
What time zone is San Marcos Regional Airport in?
San Marcos Regional Airport is in the America/Chicago time zone (UTC-05:00).
What is the magnetic variation at San Marcos Regional Airport?
The magnetic variation (declination) at San Marcos Regional Airport is approximately 3.2° E, per the World Magnetic Model. Variation changes slowly over time — always use the current value charted for navigation.
What airports are near San Marcos Regional Airport?
The nearest airport to San Marcos Regional Airport is Alison Air Park (7TS2), about 3.9 nm to the ssw, followed by Roland Ranch Airport and Fentress Airpark.
Is the information on this page suitable for flight planning?
No. San Marcos Regional Airport data here is for reference and training only — not for navigation. Always consult official sources and current charts before any flight.