This 295.7-mile drive from Heath, TX, to San Antonio, TX, is designed for a single day, taking approximately 5 hours and 20 minutes. The majority of your journey, 65% of it, will be on major highways like I 35 and the Purple Heart Trail. With a fuel cost estimated at $45, this is a straightforward trip across the Great Plains region of Texas. It’s a manageable distance for one day, allowing you to reach your destination without needing to break up the drive. Consider this route if you're looking for an efficient way to connect these two Texas cities.
Trip Pace
Same-day drive is realistic
A same-day return is possible, but it will make for a full day on the road.
Break Rhythm
1 planned break
Plan on a short reset every 3 to 4 hours to stay fresh behind the wheel.
Midpoint
147.8 miles from Heath, TX
A natural place for your longest stop of the day
, about 2h 38m into the drive
.
Step-by-step road directions between Heath, TX and San Antonio, TX.
1
Start on FM 740
0.9 mi·1 min·Bois D'Arc
2
Continue on FM 740
3.6 mi·5 min·FM 740
3
Turn right onto FM 460
1.0 mi·1 min·Clements Drive
Use the right lane.
4
Turn right onto West US Highway 80
0.2 mi·22 sec·West US Highway 80
5
Take the ramp
0.2 mi·26 sec
Toward US 80 West
6
Merge onto US 80
7.4 mi·7 min·US 80
Use the straight / slight right lanes.
7
Take the exit
0.9 mi·1 min
Toward I 635 SouthUse the slight right lane.
8
Merge onto I 635
18 mi·19 min·Lyndon B Johnson Freeway
Use the straight / slight right lanes.
9
Take the exit
1.0 mi·2 min
Exit 467BToward I 35E South: WacoUse the straight / slight right lanes.
10
Merge onto I 35E
80 mi·1 hr 22 min·South R L Thornton Freeway
Use the straight / slight right lanes.
11
Continue on I 35; US 77
6.6 mi·7 min·North Jack Kultgen Expressway
Use the straight / slight right lanes.
12
Continue on I 35
38 mi·39 min·Purple Heart Trail
Use the straight / slight right lanes.
13
Keep slight left at fork onto I 35
56 mi·58 min·I 35
Use the straight / slight right lanes.
14
Keep slight left at fork onto I 35; US 290
50 mi·54 min·Purple Heart Trail
Toward 32nd Street, Dean Keeton StreetUse the slight left lane.
15
Continue on I 35
1.7 mi·1 min·Interstate Highway 35
Use the straight / slight right lanes.
16
Continue on I 35
12 mi·12 min·Purple Heart Trail
Use the straight / slight right lanes.
17
Continue on I 35
10.0 mi·11 min·North Pan Am Expressway
Use the straight / slight right lanes.
18
Keep slight left at fork onto I 35
6.4 mi·8 min·North Pan Am Expressway
Toward I 35 SouthUse the straight / slight right lanes.
19
Keep slight left at fork onto I 35
0.6 mi·41 sec·North Pan Am Expressway
Toward I 35 South: Lower Level, LaredoUse the slight left lane.
20
Take the exit
0.1 mi·16 sec
Exit 157AToward Lexington Avenue, Main Avenue, San Pedro AvenueUse the slight right lane.
21
Turn straight onto East Elmira Street
526 ft·17 sec·East Elmira Street
Use the left / straight lanes.
22
Turn left onto North Main Avenue
0.2 mi·18 sec·North Main Avenue
Use the left / straight lanes.
23
Enter roundabout onto Navarro Street
159 ft·3 sec·Navarro Street
24
Continue on Navarro Street
111 ft·2 sec·Navarro Street
25
Keep slight right at fork onto North Main Avenue
0.4 mi·51 sec·North Main Avenue
Use the slight left / slight right lanes.
26
Turn right onto West Travis Street
222 ft·10 sec·West Travis Street
27
Turn left onto North Flores Street
0.2 mi·20 sec·North Flores Street
28
Continue on Military Plaza
392 ft·15 sec·Military Plaza
29
Turn left onto Dolorosa Street
327 ft·8 sec·Dolorosa Street
30
Arrive at destination
Dolorosa Street
Trip Plan
Given the 5 hour and 20 minute duration, departing Heath, TX, in the morning is recommended to make the most of daylight. You'll want to plan for at least one stop, and with a longest stretch of 99.6 miles, consider a break around the halfway point. Keep an eye on fuel; the estimated cost is $45 for the 295.7 miles. Since this route is well-suited for a single day, you have flexibility in your departure time. A practical tip: familiarize yourself with the major highway transitions, particularly as you merge onto I 35, to ensure a smooth continuation of your journey.
Morning Departure
An early start around 7-8 AM gets you there with plenty of daylight left.
Evening Departure
A late afternoon start means arriving after dark. Morning is better.
You can normally do this drive in one day.
Plan roughly 1 meaningful break for fuel, food, and rest.
The halfway point lands around 147.8 miles from Heath, TX, or about 2h 38m into the drive.
The longest continuous stretch on this route runs about 99.6 miles.
This is a comfortable same-day trip.
Departure
Before you leave
Start with fuel, water, and navigation already sorted so the first hour feels easy.
First stop
Around 65 miles or 1h 12m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 147.8 miles or 2h 38m in
This is the best place for your longest stop, a real meal, and a full fuel check.
Final approach
Final hour starts around 4h 18m
Traffic, exits, and arrival timing usually matter more near San Antonio, TX than in the middle of the route.
Before You Leave
+
Open the route before leaving Heath, TX so your first major turns are already loaded.
+
Leave with enough water and a charging cable within reach, not packed away.
+
Check your fuel range against the first long segment, especially if you are starting outside city service areas.
Day 1
Settle into the route from Heath, TX
This is one driving day of about 295.7 miles and 5h 20m.
Your first comfortable stop window is around 65 miles from Heath, TX.
This route can stay practical as a one-day drive if traffic stays reasonable.
Plan about 1 real break rather than only quick fuel stops.
The longest stretch is on Purple Heart Trail for about 99.6 miles.
Where to Stop
Rest stops, refuel points, and overnight suggestions along this route.
Place data sourced from public business listings. Hours and availability may vary.
Heads-up: tricky spots
5 of 20
5 decision points cluster between mile 32.5 and 294.5 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
7
32.5 mi into trip|~38m in
Take the exit toward I 35E South: Waco
Exit ramp - move to the correct lane early. Lane positioning matters here
Use the straight / slight right lanes.
Exit 467B
Toward I 35E South: Waco
8
214.1 mi into trip|~3h 47m in|I 35; US 290 / Purple Heart Trail
Keep slight left at fork onto I 35; US 290 / Purple Heart Trail toward 32nd Street, Dean Keeton Street
Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one
Use the slight left lane.
Toward 32nd Street, Dean Keeton Street
7
287.6 mi into trip|~5h 8m in|I 35 / North Pan Am Expressway
Keep slight left at fork onto I 35 / North Pan Am Expressway toward I 35 South
Highway fork - watch signs carefully. Lane positioning matters here
Use the straight / slight right lanes.
Toward I 35 South
8
294 mi into trip|~5h 16m in|I 35 / North Pan Am Expressway
Keep slight left at fork onto I 35 / North Pan Am Expressway toward I 35 South: Lower Level, Laredo
Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one
Use the slight left lane.
Toward I 35 South: Lower Level, Laredo
8
294.5 mi into trip|~5h 17m in
Take the exit toward Lexington Avenue, Main Avenue, San Pedro Avenue
Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one
Use the slight right lane.
Exit 157A
Toward Lexington Avenue, Main Avenue, San Pedro...
Fuel & Cost
Regular Gas
$44.68 one way
$89.36 round trip
$3.84/gal25.4 MPG avg104 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$4.20
$48.91
$97.81
premium
$4.54
$52.80
$105.59
diesel
$5.61
$65.29
$130.57
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$45
Meals
$25–$50
Total
$70–$95
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 103.5 kg one way.
Prices: EIA weekly data, 2026-04-13.
Driving Electric?
About $31 in charging
· 1 stop
· 66% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
88.7
1
$31.05
$14.19
Efficient EV
73.9
0
$25.87
$11.83
EV Truck/SUV
118.3
1
$41.40
$18.92
Gas CO2
103 kg
EV CO2
35 kg (66% less)
Plan for 1 charging stop. A 30-minute DC fast charge mid-route should be enough to complete the trip comfortably.
DC fast charging avg $0.35/kWh. Home charging avg $0.16/kWh. US grid CO2: 0.39 kg/kWh.
Travel Intel
Current conditions at both ends of the drive.
Forecast as of Apr 20, 2026
Origin
Heath, TX
Late night
in Heath on Tuesday
Local time
3:10 AM
CDT
Current temp
79°F
Unavailable
Live forecast
Destination
San Antonio, TX
Late night
in San Antonio on Tuesday
Local time
3:10 AM
CDT
Current temp
70°F
Unavailable
Live forecast
84°F
Troy, TX
148 mi in
Seasonal Notes
Summer travel usually means heavier construction, hotter rest stops, and busier weekend traffic around major cities.
Winter travel shortens daylight, so a route that looks manageable on paper can feel much longer after dark.
Holiday weekends tend to make both departure and arrival windows slower than the raw route time suggests.
Time zone
Same local time
Origin and destination are on the same clock, so arrival timing is easier to judge at a glance.
Temperature spread
9 degrees cooler at arrival
A meaningful temperature swing is a good cue to rethink layers, water, and how soon you want to arrive.
Road read
5h 20m on the road
An early start around 7-8 AM gets you there with plenty of daylight left.
Weather data from the National Weather Service. Conditions may change; check closer to your travel date.
National Parks Near This Route
Worth a detour if your schedule allows.
Waco Mammoth National Monument
National Monument
Standing as tall as 14 feet and weighing 20,000 pounds, Columbian mammoths roamed across what is present-day Texas thousands of years ago. Today, the fossil specimens represent the nation's first and...
4 mi from route
~11 min detour
Free
near mile 112.2
Welcome to San Antonio Missions, a National Park Service site and the only UNESCO World Heritage Site in Texas. Each mission in the park is a center of community and has been since the early 1700s. Th...
9 mi from route
~22 min detour
Free
near mile 295.7
Park data from the National Park Service API. Alerts update every 2 hours.
More Details
What kind of drive is this?
Expect a highway-focused experience for most of this 5-hour, 20-minute trip. You'll spend a good portion of your time on major arteries, including the Purple Heart Trail and I 35, which make up 65% of the route. The longest uninterrupted stretch you'll encounter is 99.6 miles on the Purple Heart Trail, so be prepared for extended periods of highway driving. This profile suggests a steady pace, making it ideal for covering ground efficiently rather than for leisurely sightseeing.
65% highway — fuel and pacing are the main things to plan.
30 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 99.6 mi on Purple Heart Trail.
How Hard Is This Drive?
9/10
This is a straightforward highway drive that stays mostly on Purple Heart Trail and South R L Thornton Freeway. This route has several spots where lane changes, forks, or exits need your full attention. The trickiest moment comes around 32.5 miles in.
Driving Effort9/10
High effort - long or complex enough to need steady focus all day
Balances navigation complexity with total wheel time.
This is a demanding drive. With 20 significant decision points across 295.7 miles, you will need to stay alert - especially through interchange areas and urban stretches. Consider splitting it into segments if you are not comfortable with fast highway navigation.
Where does it get tricky?
The main spots that need attention: at 32.5 miles: Exit ramp - move to the correct lane early. Lane positioning matters here; at 214.1 miles (I 35; US 290 / Purple Heart Trail): Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one; at 287.6 miles (I 35 / North Pan Am Expressway): Highway fork - watch signs carefully. Lane positioning matters here.
San Antonio is the second largest city in the state of Texas and the 7th largest in the United States. It's the 24th largest metropolitan area in the country. Visited by more than 31 million annual visitors, San Antonio is a beautiful city at the axis of three different geological terrains: Hill Country, South Texas Plains and Prairie and Lakes. There's a lot to do in this city: fine art museums, historical missions and plenty of amusement parks in addition to great dining and lots of drinking. The culture and people are vibrant and interesting. San Antonio's downtown is one of the most lively in the nation.
Top landmarks
•Alamo Mission in San Antonio — historic place in San Antonio, Bexar County, Texas
•San Antonio Missions National Historical Park — historic district in San Antonio, Bexar County, Texas
•Fort Sam Houston — military base in San Antonio, Texas
Doable as a same-day drive at 5h 20m. Total distance: 295.7 miles.
Family Friendly
Moderate complexity with 1 natural rest stops along the way.
Solo Traveler
5h 20m drive, comfortable solo distance.
Frequently Asked Questions
The longest stretch is about 99.6 miles on Purple Heart Trail. The full list of main roads is in the Roads section above.
We did not find dedicated rest areas on this route. For a drive this long, plan bathroom and stretch breaks around gas stations, fast-food stops, or small-town downtowns — check the Nearby Places section for options.
It helps. This route has a higher-than-average number of complex decision points, which get harder in the dark. If the last hour of the trip is on surface roads or mountain grades, aim to arrive at San Antonio, TX before sunset when you can. Check the Trip Plan for departure windows that land you in daylight.
Only with planning. This is a long drive for kids — consider splitting it into two days rather than pushing through. Plan at least 1 meaningful breaks. Dedicated rest areas are limited, so plan gas or food stops as your bathroom breaks.
The main spots that need attention: at 32.5 miles: Exit ramp - move to the correct lane early. Lane positioning matters here; at 214.1 miles (I 35; US 290 / Purple Heart Trail): Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one; at 287.6 miles (I 35 / North Pan Am Expressway): Highway fork - watch signs carefully. Lane positioning matters here.
Yes — Waco Mammoth National Monument and San Antonio Missions National Historical Park. See the National Parks section for detour distances and tips on detours.
Not recommended in a single day. At 5.3 hours each way, a round trip means 10.7 hours of driving — that is an unsafe level of fatigue for most drivers. Plan at least one night at San Antonio, TX before the return drive.
