San Marcos Regional (KHYI), Texas
Landing essentials
Whether you can land, whether you can refuel, and how customs works here.
Overview
San Marcos Regional Airport, KHYI, sits south of Austin in the Texas Hill Country corridor and handles a steady mix of business aviation and training traffic on three paved runways, the longest stretching 6,330 feet. The airport is towered and operates under an attendance schedule of 0700-2100 daily, with full-service and self-service fuel available. Customs is not onsite at KHYI; the nearest customs airport of entry is KAUS, roughly 21 nautical miles away.
Runways
San Marcos Regional has three paved runways. The longest, 08/26, is 6,330 ft long and 100 ft wide, with an asphalt surface.
Runway geometry from published threshold coordinates. Not for navigation.
Runways are listed longest first.
Source: FAA Form 5010.
Fuel and airfield services
San Marcos Regional has Jet A+ and 100LL available on the field. Fueling is available from 7am to 9pm, daily, and the airport has an operating control tower.
Source: FAA Form 5010 / NASR.
Customs
San Marcos Regional does not clear customs. The nearest port of entry is Austin-Bergstrom International (KAUS), 21 NM away.
Source: CBP list of ports of entry.
Business aviation traffic
San Marcos Regional recorded 2,831 business aviation movements in 2025. Traffic peaks in October. Business aviation traffic at KHYI shows a pronounced spike in October, with operations well above every other month of the year.
Business jet movements, FAA TFMSC count. Peak month October, 372 movements in 2025.
Source: FAA TFMSC, business jet movements, 2025.
Climate
Weather station is on the field. Some values are estimated by the agency. 1991–2020 climate normals.
Source: NOAA NCEI.
Operating constraints
San Marcos Regional has published operating constraints in four categories: access, runway notes, environmental and other notes.
Runway 13 has a medium intensity approach lighting system (MALS). Medium intensity runway lights (MIRL) serve runways 08/26, 13/31, and 17/35, preset to low intensity. Pilots can activate the lights and increase intensity using CTAF.
For clearance delivery, contact Austin Approach.
A 6-foot fence lies 130 to 199 feet from the runway distance point, offset 360 feet to the left.
Birds and wildlife are present on and in the vicinity of the airport.
100LL is available self-service. Both 100LL and Jet A+ are available full serve.
The apron has an irregular surface throughout.
Transient aircraft parking is available only on the FBO ramp. All other ramp areas are reserved for based aircraft or require prior coordination with airport management.
Source: FAA Chart Supplement.
Nearby airfields
San Marcos Regional has five airfields within 20 NM. The closest is Lockhart Municipal, 10.24 NM east.
Part of the Austin area.
Source: Skystar calculation from official coordinates.
Skystar at KHYI
We arrange catering, fuel and trip support here. Supplier prices reach you unchanged; our coordination fee sits on its own line.
The same order, priced two ways.
$2,400.00 catering order at KHYI.
Unchanged.
What the kitchen invoices us is what your quote reads.
One line, fixed.
It does not move with the size of the order.
At cost.
Passed on at the exact amount the processor took.
Market practice figures are industry averages, not a specific competitor.
Frequently asked questions
What runways are available at KHYI?
San Marcos Regional Airport, KHYI, has three paved asphalt runways. Runway 08/26 is the longest at 6,330 feet and 100 feet wide. Runway 13/31 measures 5,601 feet, and runway 17/35 measures 5,214 feet, both also 100 feet wide. All three runways share the same 100-foot width, giving operators consistent margins regardless of which runway is active. This layout supports a range of business aircraft without length being a limiting factor for most operations.
Is customs available on site at San Marcos Regional Airport?
Customs is not onsite at San Marcos Regional Airport, KHYI. The nearest customs airport of entry is KAUS, located approximately 20.71 nautical miles away. Crews arriving internationally need to plan a stop at KAUS or coordinate clearance there before continuing operations. This distance is short enough to factor into a routing plan without major schedule disruption, but it does mean KHYI itself cannot serve as a port of entry.
What fuel types does KHYI offer?
San Marcos Regional Airport, KHYI, offers 100LL and Jet A+ fuel. According to the field remarks, 100LL is available self-service, while both 100LL and Jet A+ are also available full serve. This dual availability gives operators flexibility between cost-conscious self-fueling and full-service support depending on aircraft type and turnaround needs. Jet operators should plan for full-serve Jet A+ rather than self-service, since self-service is noted only for 100LL.
When is transient aircraft parking available at San Marcos Regional Airport?
Transient aircraft parking at San Marcos Regional Airport, KHYI, is available only on the FBO ramp. All other ramp areas are reserved for based aircraft or require prior coordination with airport management. Operators planning a visit should arrange parking through the FBO ramp rather than assuming general ramp access. This restriction is worth building into pre-arrival planning, particularly for larger aircraft or groups arriving without advance notice to airport management.
Why does business aviation traffic at KHYI spike in October?
Business aviation traffic at San Marcos Regional Airport, KHYI, rises sharply in October compared to the rest of the year, based on FAA TFMSC data for 2025. October recorded 372 business aviation operations, notably higher than every other month, which ranged roughly between 180 and 257. Dispatchers scheduling flights into KHYI during October should anticipate higher ramp and runway utilization than in surrounding months. Planning extra lead time for parking coordination during this period is advisable given the FBO-ramp-only restriction on transient parking.