Big Sandy to San Antonio is 330.6 miles and takes about 6h 11m via Purple Heart Trail, I 35, and State Highway 31 East, with a fuel budget near $50 and enough daylight to finish in a day. This trip cuts across Texas, starting in the Great Plains region and ending in the same, offering a straightforward drive. You'll spend about half your time on major highways, making it a manageable one-day journey for most drivers. Consider this route if you're looking for an efficient way to get between these two points without extensive detours.
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
165.3 miles from Big Sandy, TX
A natural place for your longest stop of the day
, about 3h 11m into the drive
.
Step-by-step road directions between Big Sandy, TX and San Antonio, TX.
1
Start on TX 155
86 ft·4 sec·North Tyler Street
2
Turn right onto US 80; TX 155
0.9 mi·1 min·West Broadway Street
Use the left lane.
3
Turn left onto TX 155
13 mi·14 min·TX 155
Use the left lane.
4
Turn right onto US 271; TX 155
4.8 mi·5 min·US Highway 271
5
Turn right onto Loop 323
1.6 mi·2 min·East Northeast Loop 323
6
Continue on Loop 323
4.3 mi·6 min·West Northwest Loop 323
7
Continue on Loop 323
0.6 mi·43 sec·South Southwest Loop 323
8
Turn right onto TX 31
1.6 mi·1 min·Chandler Highway
9
Continue on TX 31
5.6 mi·6 min·State Highway 31 West
10
Continue on TX 31
2.0 mi·2 min·East Highway 31
11
Continue on TX 31
21 mi·23 min·State Highway 31 East
12
Take the exit
0.3 mi·45 sec
13
Merge onto US 175; TX 19; TX 31; Loop 7
6.2 mi·7 min·Jed Robinson Loop
14
Take the exit
0.1 mi·21 sec
15
Keep slight left at fork
445 ft·14 sec
16
Turn right onto TX 31
4.0 mi·4 min·State Highway 31 West
17
Continue on TX 31
5.4 mi·6 min·East Royall Boulevard
18
Continue on TX 31
9.9 mi·11 min·State Highway 31 East
19
Continue on TX 31
9.3 mi·10 min·Northwest 2nd Street
20
Turn left onto TX 31
12 mi·13 min·Corsicana Bypass
Use the straight lane.
21
At end of road, turn left onto TX 31
19 mi·21 min·West State Highway 31
22
Continue on TX 31
5.5 mi·5 min·Hubbard Bypass
23
Continue on TX 31
17 mi·17 min·State Highway 31
24
Continue on US 84
2.5 mi·2 min·East US Highway 84
25
Continue on US 84
2.6 mi·4 min·Bellmead Drive
26
Turn straight onto US 84
0.4 mi·1 min·East Waco Drive
27
Turn left onto North Jack Kultgen Expressway
519 ft·12 sec·North Jack Kultgen Expressway
Use the left / straight lanes.
28
Take the ramp
0.3 mi·37 sec
Toward I 35 South, US 77 South
29
Merge onto I 35; US 77
6.1 mi·6 min·North Jack Kultgen Expressway
Use the straight / slight right lanes.
30
Continue on I 35
38 mi·39 min·Purple Heart Trail
Use the straight / slight right lanes.
31
Keep slight left at fork onto I 35
56 mi·58 min·I 35
Use the straight / slight right lanes.
32
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.
33
Continue on I 35
1.7 mi·1 min·Interstate Highway 35
Use the straight / slight right lanes.
34
Continue on I 35
12 mi·12 min·Purple Heart Trail
Use the straight / slight right lanes.
35
Continue on I 35
10.0 mi·11 min·North Pan Am Expressway
Use the straight / slight right lanes.
36
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.
37
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.
38
Take the exit
0.1 mi·16 sec
Exit 157AToward Lexington Avenue, Main Avenue, San Pedro AvenueUse the slight right lane.
39
Turn straight onto East Elmira Street
526 ft·17 sec·East Elmira Street
Use the left / straight lanes.
40
Turn left onto North Main Avenue
0.2 mi·18 sec·North Main Avenue
Use the left / straight lanes.
41
Enter roundabout onto Navarro Street
159 ft·3 sec·Navarro Street
42
Continue on Navarro Street
111 ft·2 sec·Navarro Street
43
Keep slight right at fork onto North Main Avenue
0.4 mi·51 sec·North Main Avenue
Use the slight left / slight right lanes.
44
Turn right onto West Travis Street
222 ft·10 sec·West Travis Street
45
Turn left onto North Flores Street
0.2 mi·20 sec·North Flores Street
46
Continue on Military Plaza
392 ft·15 sec·Military Plaza
47
Turn left onto Dolorosa Street
327 ft·8 sec·Dolorosa Street
48
Arrive at destination
Dolorosa Street
Trip Plan
For this 6h 11m drive, departing Big Sandy in the morning is ideal to maximize daylight and allow for an early arrival in San Antonio. With only one recommended stop and a relatively short duration, you have flexibility in pacing yourself. Keep an eye on your fuel levels, especially during the 99.6-mile stretch on Purple Heart Trail, as services might be less frequent than on I-35. A fuel cost estimate of around $50 suggests planning for at least one fill-up along the way to ensure a smooth journey.
Morning Departure
Start early — leave by 6-7 AM to arrive at a reasonable hour.
Evening Departure
This is a long drive — plan for a morning departure or consider splitting it into two days.
You can normally do this drive in one day.
Plan roughly 1 meaningful break for fuel, food, and rest.
The halfway point lands around 165.3 miles from Big Sandy, TX, or about 3h 11m 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 73 miles or 1h 27m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 165.3 miles or 3h 11m in
This is the best place for your longest stop, a real meal, and a full fuel check.
Final approach
Final hour starts around 5h 2m
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 Big Sandy, 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 Big Sandy, TX
This is one driving day of about 330.6 miles and 6h 11m.
Your first comfortable stop window is around 73 miles from Big Sandy, 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 27
5 decision points cluster between mile 90.2 and 329.4 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
6
90.2 mi into trip|~1h 46m in|TX 31 / Corsicana Bypass
Turn left onto TX 31 / Corsicana Bypass
Lane positioning matters here
Use the straight lane.
8
249.1 mi into trip|~4h 38m 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
322.5 mi into trip|~5h 59m 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
328.9 mi into trip|~6h 7m 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
329.4 mi into trip|~6h 8m 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
$49.95 one way
$99.91 round trip
$3.84/gal25.4 MPG avg116 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$4.20
$54.68
$109.36
premium
$4.54
$59.03
$118.05
diesel
$5.61
$72.99
$145.98
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$50
Meals
$25–$50
Total
$75–$100
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 115.7 kg one way.
Prices: EIA weekly data, 2026-04-13.
Driving Electric?
About $35 in charging
· 1 stop
· 66% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
99.2
1
$34.71
$15.87
Efficient EV
82.7
0
$28.93
$13.22
EV Truck/SUV
132.2
1
$46.28
$21.16
Gas CO2
116 kg
EV CO2
39 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
Big Sandy, TX
Morning
in Big Sandy on Tuesday
Local time
8:00 AM
CDT
Current temp
79°F
Unavailable
Live forecast
Destination
San Antonio, TX
Morning
in San Antonio on Tuesday
Local time
8:00 AM
CDT
Current temp
70°F
Unavailable
Live forecast
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
6h 11m on the road
Start early — leave by 6-7 AM to arrive at a reasonable hour.
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 148.2
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 330.6
Park data from the National Park Service API. Alerts update every 2 hours.
More Details
What kind of drive is this?
This drive offers a mixed experience, with 54% of the journey on highways. You'll encounter the longest uninterrupted stretch of 99.6 miles on Purple Heart Trail, which will likely feel different from the interstate sections. The drive transitions between these main roads, meaning you'll get a bit of everything: potentially faster highway speeds and more local road driving. It's not a purely monotonous interstate cruise, but rather a blend that keeps things interesting as you cover the 330.6 miles.
54% highway, the rest on surface roads — varied driving throughout.
48 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 route mixes highway mileage with some local-road sections near the start or finish. This route has several spots where lane changes, forks, or exits need your full attention. The trickiest moment comes around 90.2 miles in near TX 31 / Corsicana Bypass.
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 27 significant decision points across 330.6 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 90.2 miles (TX 31 / Corsicana Bypass): Lane positioning matters here; at 249.1 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 322.5 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 6h 11m. Total distance: 330.6 miles.
Family Friendly
Moderate complexity with 1 natural rest stops along the way.
Solo Traveler
6h 11m drive, plan rest stops for pacing.
Scenic Drive
Mixed highway & surface route profile with national parks nearby.
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 90.2 miles (TX 31 / Corsicana Bypass): Lane positioning matters here; at 249.1 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 322.5 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 6.2 hours each way, a round trip means 12.4 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.
