Dallas to SA is about 308 miles (496 km) by road and 252 miles in a straight line. The drive takes around 5 hr 30 min. The distance is the same in reverse, from SA to Dallas.
What This Distance Means for Your Trip
At 308 miles, this is a driving distance rather than a flying one — and a train or bus is often an option too. A scheduled flight would cover only about 252 miles in the air, and once you factor in getting to the airport, checking in and clearing security, that airport time alone cancels out anything saved aloft. For a trip this length, driving is almost always the practical choice.
Want the full side-by-side on time, cost and hassle? See our drive-or-fly breakdown for Dallas to SA.
How we calculate these figures
Straight-line distance uses the great-circle (haversine) formula between each city's centre coordinates. Road distance applies a circuity factor of roughly 1.2–1.4× to reflect that roads are not straight. Driving time assumes typical blended speeds for a trip of this length, and flight time is the great-circle distance at about 875 km/h cruise plus around 30 minutes for taxi, climb, descent and approach. The door-to-door air estimate adds about three hours for airport access, check-in, security and boarding. Real figures vary with your exact route, traffic, weather, aircraft and connections.
Dallas to San Antonio covers nearly the length of the I-35 corridor through Central Texas — about 275 miles through Waco and Austin to the Alamo City. It's a busy, well-trodden Texas route.
The drive passes through Waco (the halfway point) and then continues through Austin before the final run down to San Antonio. Many travelers break the trip with a night in Austin.
Stops Along the Way
The classic halfway stop on I-35 — Magnolia Market, the Waco Mammoth National Monument, and Dr Pepper.
Many stop here for an evening on 6th Street or a morning at Franklin Barbecue, making it a natural overnight between Dallas and San Antonio.
Meeting someone from SA? Find the exact halfway point between Dallas and SA so neither of you drives the whole way — or plan evenly-spaced rest and fuel stops along the route.
Tips for This Trip
Make Austin a stopover
Breaking the drive in Austin turns a long one-day trip into an enjoyable two-city journey — 3 hours to Austin, 1.5 hours Austin to San Antonio.
The San Antonio approaches are straightforward
Unlike Austin or Dallas, I-35 into San Antonio is relatively free-flowing except near loop roads at rush hour.
Time for the River Walk at golden hour
San Antonio's famous River Walk is stunning in the late afternoon light — time your arrival to enjoy it before dinner.
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Frequently Asked Questions
San Antonio is about 240 miles (386 km) from Dallas in a straight line, and approximately 275 miles (443 km) by road via I-35 through Waco and Austin.