Austin, Texas
KHYI San Marcos Rgnl
San Marcos Rgnl (KHYI) is a towered, public-use airport in Austin, Texas, at 594.7 ft MSL. It has 3 runways: 08/26 (6,330 by 100 ft, asphalt), 13/31 (5,601 by 100 ft, asphalt), 17/35 (5,214 by 100 ft, asphalt). CTAF 126.825.
FAA NASR data effective Oct 29, 2026. Not for navigation; verify with current FAA charts and the Chart Supplement.
Airport
At a glance
- Identifiers
- ICAO KHYI, FAA HYI
- Location
- Austin, Texas (Caldwell County). 31 NM S of the city center
- Elevation
- 594.7 ft MSL
- Position
- 29.8928° N, 97.8630° W
- Control tower
- Yes (ATCT)
- Sectional chart
- San Antonio
- Magnetic variation
- 7° E (1985)
- Fuel
- 100LL, Jet A+
- Ownership
- Publicly owned, open to the public
- Attendance
- Daily 0700-2100
3 runways
Runways
| Runway | Length × width | Surface | Edge lights |
|---|---|---|---|
| 08/26 | 6,330 × 100 ft | Asphalt, good condition | Medium intensity |
| 13/31 | 5,601 × 100 ft | Asphalt, good condition | Medium intensity |
| 17/35 | 5,214 × 100 ft | Asphalt, good condition | Medium intensity |
Runway ends and traffic pattern
| End | Pattern | Glide slope lights | Instrument | Displaced threshold | Landing distance |
|---|---|---|---|---|---|
| 08 | Left traffic | None listed | None listed | None listed | Not listed |
| 26 | Left traffic | None listed | None listed | None listed | Not listed |
| 13 | Left traffic | 2-light PAPI, left | ILS | None listed | Not listed |
| 31 | Left traffic | 2-light PAPI, left | None listed | None listed | Not listed |
| 17 | Left traffic | 2-light PAPI, left | None listed | None listed | Not listed |
| 35 | Left traffic | None listed | None listed | None listed | Not listed |
VHF
Frequencies
- ATIS
- 120.825
- "San Marcos". Hours 0700-2100 EFF 01 APR 2021
- CTAF
- 126.825
- Tower
- 126.825
- "San Marcos". Hours 0700-2100 EFF 01 APR 2021
- Ground
- 120.125
- "San Marcos". Hours 0700-2100 EFF 01 APR 2021
- Clearance delivery
- 120.125
- "San Marcos". Hours 0700-2100 EFF 01 APR 2021
- Clearance delivery
- 121.35
- "San Marcos". Sector WHEN HYI TWR CLSD
- Approach / departure
- 119.0
- "Austin"
Weather station
- AWOS-3PT HYI
- No frequency listed
Before you go
Brief KHYI in Ascent EFB.
Current weather, NOTAMs and the airport diagram for San Marcos Rgnl, in the app on iPhone and iPad.
Not for navigation. Verify with current FAA charts and the Chart Supplement before flight.
Source: FAA NASR 28-day subscription, cycle effective Oct 29, 2026. Airport data changes every 28 days and NOTAMs can override it at any time.