How far is San Antonio from Austin?
San Antonio is about 79 miles from Austin by road — a drive of roughly 1 hr 31 min in normal traffic heading south on I-35. The figures below come from live road-network routing between the two downtowns, measured in the direction travelers actually ask about: starting in Austin and ending in San Antonio. Friday afternoons and Fiesta or event weekends in San Antonio can stretch the trip past two hours at peak.
The drive south from Austin to San Antonio
Leave downtown Austin on I-35 S and the metro thins out fast: San Marcos arrives in about 37 min, then New Braunfels, and the Texas hill country flattens into the San Antonio sprawl just past the airport exits. Most of the mileage stacks up in the northern half; once you clear New Braunfels the remaining run into downtown San Antonio is short and predictable.
Distance and drive-time snapshot
Distance: about 79 road miles from downtown Austin to downtown San Antonio. Typical drive time: 1 hours 31 minutes in normal traffic. Add 30–45 minutes for San Antonio rush hours or event weekends, and a few more minutes door-to-door depending on your exact pickup and drop-off addresses.
Drive times from Austin to towns on the corridor
All figures below from the same live road-network routing (distances are road miles from Austin, times are typical driving minutes in normal traffic):
| Town | Distance from Austin | Typical drive |
|---|---|---|
| San Marcos, TX | 31 miles | 37 min |
| New Braunfels, TX | 49 miles | 57 min |
| Seguin, TX | 60 miles | 67 min |
| San Antonio, TX (downtown) | 79 miles | 91 min |
Shuttle from Austin to San Antonio
Texas Shuttle runs private, door-to-door shuttle service on this corridor 24/7 — pickup at any address in Austin, drop-off at any address in San Antonio, flat rate, no surge pricing at any hour.
Based on 23 real completed Texas Shuttle trips on this corridor, a private sedan or SUV has typically run $430-$546 each way (25th–75th percentile; most rides land near $465). Round trips save 10% off each way.
Group travel on this corridor
Shuttle vans seat up to 8 with luggage, so a family or group traveling together pays one flat vehicle price, not per head — often beating per-person rideshare pricing on a corridor this long.
How Far Is San Antonio From Austin?
Austin and San Antonio are approximately 80 miles apart by road. Driving the route via Interstate 35 South covers 79 miles (127.64 kilometers), while the straight-line distance — as the crow flies — is 73.59 miles in a southwest direction, according to DistanceCalc (distance-cities.com). With no traffic, a nonstop drive takes roughly 1 hour 16 minutes. In the real world, plan on about 1.5 hours, and budget up to 2 hours 15 minutes if you hit rush hour around either metro.
Updated for 2026 travel planning.
Whether you're commuting for work, catching a flight, or planning a Hill Country weekend, this guide breaks down the distance, drive times, fuel costs, halfway-point stops, and every way to make the trip — so you can pick the option that fits your schedule and budget.
Driving Distance vs. Straight-Line Distance
There are two answers to "how far," and both matter when you're planning the trip:
- Driving distance: 79 miles (127.64 km) by car, following the I-35 and US-290 route southwest out of Austin. Texas Shuttle's route data puts it at 80 miles (129 km) via Interstate 35 South — effectively the same corridor.
- Straight-line distance: about 74 miles (73.59 miles per DistanceCalc). This is the measurement you'd see on a map with no roads considered.
The difference exists because I-35 doesn't run as the crow flies. The highway bends east through Round Rock, then south through Georgetown's outskirts, San Marcos, New Braunfels, and Schertz before reaching downtown San Antonio. Those gentle curves add a handful of miles to the crow-flies figure — a normal gap for a major interstate.
How Long Does the Drive From Austin to San Antonio Take?
The calculated nonstop drive time is 1 hour 16 minutes. That's the textbook answer. Here's what the trip actually looks like:
- Light traffic: about 1.5 hours door to door.
- Typical conditions: 2 hours or more — congestion on I-35 around both metros regularly adds buffer time, so pad your schedule if you have a fixed arrival.
- Rush hour: during weekday peaks (roughly 7–9 a.m. and 4–6 p.m.), the trip can stretch to 2 hours 15 minutes. Morning southbound traffic bunches near downtown Austin and San Marcos; evening northbound slows through the same choke points in reverse.
Tips for Beating I-35 Traffic
Leave before 6:30 a.m. or after 7 p.m. on weekdays when possible. Friday afternoons are the single worst window on this corridor, especially during UT football home games and holiday weekends. Checking a live traffic app before you commit to a departure time can easily save you 30–60 minutes.
Best Route: I-35 vs. the Alternatives
Interstate 35 South (The Standard Route)
I-35 is by far the fastest and most common route between the two cities. It's a straight shot — US-290 connects you to I-35 on Austin's northeast side, and from there it's one highway almost the entire way to downtown San Antonio, where I-35 meets I-37 and US-281 near the Alamodome.
Alternative Routes: US-281 and TX-130
You have other options, but know the tradeoff: routes via US-281 (a more westerly path through Blanco County country) or the TX-130 toll road (which swings east and connects to I-10 near Seguin) each add roughly 15–30 minutes. And here's the hidden catch — they don't reliably avoid traffic during peak hours, since congestion concentrates on I-35 itself and spills over. For most travelers at most times, I-35 remains the right call.
Gas Cost, Fuel Consumption, and Emissions
Wondering what the drive costs at the pump? DistanceCalc estimates the gas cost from Austin to San Antonio at about $12.36 each way for an average car, based on a Texas average of $3.88 per gallon of regular gas. That works out to roughly 3 gallons for the one-way trip — figures that will drift up or down with current pump prices, so treat them as ballpark estimates rather than quotes.
Round-trip driving costs more than gas alone once you add it all up. A typical sedan runs roughly $25–$35 in gas and tolls for the full round trip, and downtown San Antonio parking near the River Walk can add $15–$25 per day.
Emissions: What the Trip Produces
According to DistanceCalc's emissions model, an average car releases about 62.41 pounds of CO2 into the atmosphere on this route — a carbon footprint of 0.79 pounds per mile. Sharing the ride cuts your per-person footprint dramatically; a full vehicle or shared shuttle spreads that output across multiple travelers.
The Halfway Point: New Braunfels
The geographic midpoint between Austin and San Antonio sits 39.66 miles from each city — approximately 38 minutes of driving from either end. The closest actual city to that halfway point is New Braunfels, TX, located 48 miles from Austin and just 32 miles from San Antonio. The asymmetry makes sense: traffic flows faster on the southern half of the corridor, so it takes about 45 minutes to reach New Braunfels from Austin versus only 33 minutes from San Antonio.
New Braunfels is one of the best reasons to build extra time into this drive. Founded by German settlers in 1845, it sits on the edge of the Hill Country and offers:
- Gruene Historic District — home to Gruene Hall, Texas' oldest continually operating dance hall, where you can catch live music most nights.
- The Comal River — famously short and spring-fed, a tubing favorite in summer.
- Schlitterbahn Waterpark — one of the most-visited waterparks in the country during warm months.
- Natural Bridge Caverns — just off I-35 between New Braunfels and San Antonio, with some of the largest show caves in Texas.
San Marcos, about 10 minutes north on the same highway, is another classic stop, with premium outlet shopping and Texas State University anchoring the town. Either location works well as a stretch-your-legs break roughly at the trip's midpoint.
Weather in Austin and San Antonio
Good news for planners: only about 80 miles apart, the two cities share nearly identical weather. Both sit in Central Texas' humid subtropical climate zone, so you won't need to pack differently for one end of the drive.
- Summer (June–September): hot and sunny, with highs regularly in the 90s. Start long drives early.
- Winter (December–February): generally mild, with cool mornings and afternoons often mild enough for the River Walk.
- Spring and fall: the sweet spots — warm days, cooler evenings, and the region's best driving conditions.
One caution: heavy thunderstorms, especially in spring and fall, can produce localized flash flooding on low-lying stretches of I-35. If severe weather is in the forecast, allow extra time and check road conditions before departing.
Getting There Without Driving: Compare Your Options
Most travelers drive, but it's not the only way to cover the 80 miles. and 4–6 p.m. rush windows that can add 30–60 minutes. Add parking costs downtown and the mental load of construction zones, and the "cheapest" option starts looking less simple.
Private Shuttle: Door to Door, No Parking Hassle
If you'd rather skip I-35 driving and downtown parking entirely, a private shuttle is the most popular non-driving option between the two cities. Texas Shuttle operates 24/7 between Austin and San Antonio, including direct service to and from Austin-Bergstrom International (AUS) and San Antonio International (SAT). The trip covers the same ~80 miles via I-35 South and takes roughly 1 hour 20 minutes without traffic — about the same as driving yourself, but you're dropped at the door with no rental counter, no parking fee, and no navigation. Flat-rate per-vehicle pricing means no surge surprises; booking is available online around the clock through the Texas Shuttle website or by phone.
Rideshares: Convenient but Pricey
Uber and Lyft run $90–$150+ one-way between the cities (estimates), with surge pricing that spikes during peak hours, weekends, and major events like SXSW, F1 race weekend, and Fiesta. Fast and easy when the price holds — but check the fare before you commit.
Public Buses: Cheap but Slow
Intercity bus services offer the lowest fares, but multiple stops extend total travel time to 2–2.5 hours, and rider reviews consistently cite cramped seats, inconsistent schedules, and limited luggage capacity. Fine for flexible budgets and timelines; tough if you're on a clock.
Where to Stay in San Antonio
If the trip turns into an overnight, downtown puts you in walking distance of the Alamo and the River Walk. Well-regarded options across budget levels include the historic Menger Hotel steps from the Alamo, River Walk mainstays like Omni La Mansion del Rio and the Hilton Palacio del Rio, and the Grand Hyatt near the Henry B. González Convention Center. For a trendier stay, the Pearl District a few miles north — home to Hotel Emma in a restored 19th-century brewery — has become one of the city's most popular neighborhoods for dining and nightlife. Booking near the River Walk also means you can park once and explore on foot, sidestepping downtown parking fees entirely.
Renting a Car in Austin for the Drive
Travelers flying into Austin-Bergstrom (AUS) will find a consolidated rental facility on-site with all the major agencies, plus additional downtown pickup locations around the convention center area.