San Marcos Regional Airport
HYI · KHYI · San Marcos, TX · 597 ft elevation · var 7E · Towered
Airport information
- ICAO / IATA
- KHYI
- Coordinates
- 29.8927, -97.8630
- Elevation
- 597 ft MSL
- Magnetic variation
- 7E
- Sectional chart
- SAN ANTONIO
- Airport use
- Public
- Control tower
- Yes
- Tower hours
- 0700-2100 EFF 01 APR 2021
- Airspace
- Class D · CLASS D SVC 0700-2100 EFF 01 APR 2021; OTHER TIMES CLASS E
- Weather station
- AWOS-3PT · 120.825 · ☎ 512-353-8005
- ARTCC
- HOUSTON (ZHU)
- Flight service (FSS)
- SAN ANGELO · 1-800-WX-BRIEF
- NOTAM facility
- HYI
- Attendance
- ALL 0700-2100
- Beacon
- white-green (SS-SR)
- Segmented circle
- Yes
- Wind indicator
- lighted
- Activated
- 1965/05
- Distance from city
- 31 S
Weather
METAR observed
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TAF forecast
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Sun & FAA night 2026-06-22
| Event | Local (CDT) | UTC |
|---|---|---|
| Morning civil twilight Loggable night ends | 06:04 AM | 11:04Z |
| Sunrise | 06:31 AM | 11:31Z |
| Sunset | 08:36 PM | 01:36Z |
| Evening civil twilight Loggable night begins | 09:03 PM | 02:03Z |
Plan a flight from KHYI
Night operations
- Airport lighting
- SEE RMK
- Rotating beacon
- white-green · SS-SR
- Pilot-controlled lighting
- MALS RWY 13; MIRL RWYS 08/26, 13/31 & 17/35 PRESET LOW INTST; TO ACTVT AND INCR INTST - CTAF. on 126.825 — Chart Supplement ↗
Runway lighting aids — 13: 2-light PAPI (left) + MALS · 31: 2-light PAPI (left) · 17: 2-light PAPI (left).
FAA night windows (civil twilight, loggable night §1.1, currency §61.57) are in the live weather panel above.
Traffic pattern
- Landing
- Rwy 08 · 081°
- Pattern
- left (turns left)
- TPA
- 1,600 ft MSL (≈1,000 AGL)
- CTAF
- 126.825
Enter the left downwind for Rwy 08 at 1,600 ft MSL (≈1,000 AGL) on a 45°. TPA estimated at 1,000 ft AGL (not charted for this field).
Runway 08/26
6,330 ft × 100 ft · Asphalt (Good)- Heading
- 081° mag · 88° true
- Threshold elev
- 588 ft
- Markings
- nonprecision
- Traffic pattern
- Left
- Approach obstacle
- Hangar, 25 ft, 201 ft from threshold, 488 ft L of centerline
- TDZ elevation
- 589 ft
- Heading
- 261° mag · 268° true
- Threshold elev
- 580 ft
- Markings
- nonprecision
- Traffic pattern
- Left
- Approach obstacle
- Crops, 29 ft, 732 ft from threshold, 425 ft R of centerline — 18:1 slope to clear · penetrates the 20:1 visual approach surface
- TDZ elevation
- 587 ft
Runway 13/31
5,601 ft × 100 ft · Asphalt (Good)- Heading
- 126° mag · 133° true
- Threshold elev
- 593 ft
- Markings
- precision
- VGSI
- 2-light PAPI (left) (3°)
- Approach lights
- MALS
- Instrument landing
- ILS · CAT I · LOC 108.7 (RUM) · GS 3.00°
- Traffic pattern
- Left
- Threshold crossing height
- 57 ft
- TDZ elevation
- 593 ft
- Heading
- 306° mag · 313° true
- Threshold elev
- 573 ft
- Markings
- precision
- VGSI
- 2-light PAPI (left) (3°)
- Traffic pattern
- Left
- Threshold crossing height
- 60 ft
- TDZ elevation
- 583 ft
Runway 17/35
5,214 ft × 100 ft · Asphalt (Good)- Heading
- 171° mag · 178° true
- Threshold elev
- 595 ft
- Markings
- nonprecision
- VGSI
- 2-light PAPI (left) (3°)
- Traffic pattern
- Left
- Threshold crossing height
- 55 ft
- TDZ elevation
- 595 ft
- Heading
- 351° mag · 358° true
- Threshold elev
- 575 ft
- Markings
- nonprecision
- Traffic pattern
- Left
- TDZ elevation
- 583 ft
| Runway | Length | Your margin |
|---|---|---|
| 08/26 | 6,330 ft | |
| 13/31 | 5,601 ft | |
| 17/35 | 5,214 ft |
Communication frequencies
Tower & ground · “San Marcos”
| ATIS | 120.825 |
| Clearance | 120.125 · 121.35 (WHEN HYI TWR CLSD) |
| Ground | 120.125 |
| Tower | 126.825 |
| CTAF | 126.825 |
Approach & departure · “Austin”
| App/Dep | 119.0 | SZAGI arrivals; AEROZ · BNDIA · ELOEL +3 more departures |
ATC assigns the exact frequency (in your clearance or on handoff) — which one depends on your SID (departing) or STAR (arriving).
By procedure & sector (6 frequencies)
| Frequency | Used by |
|---|---|
| 118.15 | SZAGI STAR (SFC-7000 FT) |
| 119.0 | AEROZ DP · BNDIA DP · ELOEL DP · ILEXY DP · MUCKY DP · SAYBR DP · SZAGI STAR (8,000-12,000 FT) |
| 127.225 | BLEWE STAR · GABOO STAR · POTRR STAR |
| 317.65 | BLEWE STAR · GABOO STAR · POTRR STAR |
| 350.25 | SZAGI STAR (SFC-7000 FT) |
| 370.85 | AEROZ DP · APCH/P DEP/P · BNDIA DP · ELOEL DP · ILEXY DP · MUCKY DP · SAYBR DP · SZAGI STAR (8,000-12,000 FT) |
Source: FAA NASR (current 28-day cycle).
Instrument landing systems
| Runway | ILS |
|---|---|
| RWY 13 | ILS · CAT I · LOC 108.7 (RUM) · GS 3.00° |
Source: FAA NASR (current 28-day cycle).
Nearby navigation aids
| NavAid | Type | Freq | Radial / Dist magnetic |
|---|---|---|---|
| DHK · Randolph | TACAN | 109.90 | r036° / 30 NM |
| RND · Randolph | VORTAC | 112.30 | r035° / 31.4 NM |
| CWK · Centex | VORTAC | 112.80 | r205° / 33.9 NM |
| SAT · San Antonio | VORTAC | 116.80 | r056° / 34.6 NM |
Airport diagram
Open PDF ↗Preview diagram
Procedures at a glance
⚠ Hot spots published at this airport — review the hot-spot chart before you taxi ↗Approaches7
Departures
Minimums & Hot Spots
Chart Supplement FAA A/FD
Open PDF ↗Preview Chart Supplement
VFR sectional
Services
- Fuel available
- 100LL, Jet A (additive)
- Bottled oxygen
- LOW
- Airframe service
- MAJOR
- Powerplant service
- MAJOR
- Parking
- tiedowns, hangars
- Other services
- Avionics, Charter, Instruction, Rental, Aircraft sales
Ownership & management
Remarks FAA
- ESTABLISHED PRIOR TO 1940.
- FOR CD CTC AUSTIN APCH AT 512-369-7865.
- APN ALL IREG SFC.
- BIRDS AND WILDLIFE ON AND INVOF ARPT.
- TSNT ACFT PRKG AVBL ON FBO RAMP ONLY. ALL OTR RAMP AREAS RESD FOR BASED ACFT OR RQR PRIOR CDN WITH ARPT MGMT.
- MALS RWY 13; MIRL RWYS 08/26, 13/31 & 17/35 PRESET LOW INTST; TO ACTVT AND INCR INTST - CTAF.
- FOR AFT HRS SVC 800-229-2379. CALL-IN FEE.
- 100LL SELF SVC; 100 LL & JET A+ AVBL FULL SERVE.
- 6 FT FENCE 130-199 FT DSTC, 360 FT L.
Nearby airports
Weather is live from the Aviation Weather Center; airport facility data is from the FAA NASR (28-day cycle). For planning and education only; always verify against official sources. Open KHYI in a full tool: METAR/TAF decoder, crosswind calculator, sun & night times, or the density altitude calculator. Planning from here? Find the nearest airport with fuel or an approach, or check whether an IFR alternate is required.
About KHYI
San Marcos Regional Airport (HYI · KHYI) is an airport in San Marcos, TX, at 597 ft MSL. It has 3 runways, the longest 6,330 ft, with a control tower. This page shows live METAR/TAF weather, runway crosswinds, frequencies, navaids, and FAA charts for KHYI, refreshed from the Aviation Weather Center and FAA NASR.
Does KHYI have a control tower?
Yes. San Marcos Regional Airport has an operating FAA control tower. Check the Comms & NavAids tab for tower and ground frequencies.
What is the longest runway at KHYI?
San Marcos Regional Airport has 3 runways; the longest is 6,330 ft. See the Runways tab for headings, surface, and lighting.
Where is KHYI?
San Marcos Regional Airport is in San Marcos, TX, at an elevation of 597 ft MSL. Coordinates: 29.8927, -97.8630.
Fly out of KHYI often?
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