Traveling from Troy to San Antonio spans 172.3 miles and takes approximately 2 hours and 37 minutes of driving time. Because the trip is relatively short, you can easily complete it in a single day without needing an overnight stay. You will navigate via West Main Street and South Central Avenue before transitioning to I-35 South to reach your destination. Budgeting around $26 for fuel should cover your transit costs between these two Great Plains locations. This straightforward route offers a practical connection between the two cities, making it an ideal choice for a quick getaway or a necessary commute.
Trip Pace
Same-day drive is realistic
A same-day return is realistic if you keep stops short.
Break Rhythm
1 planned break
A short stop every 2 to 3 hours is enough for this drive.
Midpoint
76.6 miles from Troy, TX
A natural place for your longest stop of the day
, about 1h 22m into the drive
.
Who Is This Route For?
Weekend Trip
Doable as a same-day drive at 2h 49m. Total distance: 153.2 miles.
Family Friendly
Moderate complexity with 1 natural rest stops along the way.
Solo Traveler
2h 49m drive, comfortable solo distance.
First-Time Driver
Mostly highway driving (49%). Some complex stretches to watch for.
Scenic Drive
Mixed drive route profile with national parks nearby.
Drive Character
Expect a turn-heavy local drive rather than a monotonous interstate cruise during this 172.3-mile journey. While the route incorporates I-35 South, the initial segments on West Main Street and South Central Avenue contribute to a more technical experience behind the wheel. You will find that there is no single long, uninterrupted highway stretch, as the longest leg is 0 miles on West Main Street. This mix of local roads and highway driving keeps the experience varied, requiring your full attention as you navigate through the regional landscape.
Expect a mix of faster highway mileage and slower local approaches near the beginning or end.
There are about 23 navigation steps in the underlying route data, so the final approach matters more than the middle miles.
Purple Heart Trail is the longest continuous segment at about 75.9 miles.
How Hard Is This Drive?
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 15.8 miles in near I 35.
Driving Effort7/10
Demanding - plan breaks and stay ahead of the key maneuvers
Balances navigation complexity with total wheel time.
This is a demanding drive. With 16 significant decision points across 153.2 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 15.8 miles (I 35): Highway fork - watch signs carefully. Lane positioning matters here; at 71.6 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 145 miles (I 35 / North Pan Am Expressway): Highway fork - watch signs carefully. Lane positioning matters here.
Critical Maneuvers
5 of 16 key points
These are the spots where you need to pay the most attention. Preview them before you drive.
6
15.8 mi into trip|~18m in|I 35
Keep slight left at fork onto I 35
Highway fork - watch signs carefully. Lane positioning matters here
Use the straight / slight right lanes.
8
71.6 mi into trip|~1h 17m 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
145 mi into trip|~2h 38m 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
151.4 mi into trip|~2h 46m 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
152 mi into trip|~2h 46m 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...
Step-by-step road directions between Troy, TX and San Antonio, TX.
1
Start on South Central Avenue
30 ft·8 sec·South Central Avenue
2
Turn left onto FM 935
235 ft·13 sec·West Main Street
3
Turn left onto South Central Avenue
1.1 mi·1 min·South Central Avenue
4
Take the ramp
0.4 mi·56 sec
Toward I 35 South
5
Merge onto I 35
14 mi·15 min·Purple Heart Trail
Use the straight / slight right lanes.
6
Keep slight left at fork onto I 35
56 mi·58 min·I 35
Use the straight / slight right lanes.
7
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.
8
Continue on I 35
1.7 mi·1 min·Interstate Highway 35
Use the straight / slight right lanes.
9
Continue on I 35
12 mi·12 min·Purple Heart Trail
Use the straight / slight right lanes.
10
Continue on I 35
10.0 mi·11 min·North Pan Am Expressway
Use the straight / slight right lanes.
11
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.
12
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.
13
Take the exit
0.1 mi·16 sec
Exit 157AToward Lexington Avenue, Main Avenue, San Pedro AvenueUse the slight right lane.
14
Turn straight onto East Elmira Street
526 ft·17 sec·East Elmira Street
Use the left / straight lanes.
15
Turn left onto North Main Avenue
0.2 mi·18 sec·North Main Avenue
Use the left / straight lanes.
16
Enter roundabout onto Navarro Street
159 ft·3 sec·Navarro Street
17
Continue on Navarro Street
111 ft·2 sec·Navarro Street
18
Keep slight right at fork onto North Main Avenue
0.4 mi·51 sec·North Main Avenue
Use the slight left / slight right lanes.
19
Turn right onto West Travis Street
222 ft·10 sec·West Travis Street
20
Turn left onto North Flores Street
0.2 mi·20 sec·North Flores Street
21
Continue on Military Plaza
392 ft·15 sec·Military Plaza
22
Turn left onto Dolorosa Street
327 ft·8 sec·Dolorosa Street
23
Arrive at destination
Dolorosa Street
Trip Plan
Since this is a 2-hour and 37-minute drive, you have plenty of flexibility in your departure schedule to avoid peak traffic. Plan for at least one stop along the way to break up the 172.3-mile distance and keep your energy levels up. Keep your $26 fuel budget in mind as you prep your vehicle, ensuring you have enough for the full trip. Because the route relies on a combination of local streets and I-35 South, monitor your navigation closely during the initial turn-heavy portions of the drive. Taking your time through the local sections will make the transition onto the highway much smoother.
Morning Departure
Leave by 9 AM and you'll arrive before lunch.
Evening Departure
Even a 4 PM departure gets you there before dark in summer.
You can normally do this drive in one day.
Plan roughly 1 meaningful break for fuel, food, and rest.
The halfway point lands around 76.6 miles from Troy, TX, or about 1h 22m into the drive.
The longest continuous stretch on this route runs about 75.9 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 80 miles or 1h 26m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 76.6 miles or 1h 22m in
This is the best place for your longest stop, a real meal, and a full fuel check.
Final approach
Final hour starts around 2h 16m
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 Troy, 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 Troy, TX
This is one driving day of about 153.2 miles and 2h 49m.
Your first comfortable stop window is around 80 miles from Troy, 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 75.9 miles.
Where to Stop
Rest stops, refuel points, and overnight suggestions along this route.
Halfway Point
Midpoint
About 76.6 mi from Troy, TX
· 1h 22m into the drive
The midpoint is around 76.6 miles from Troy, TX, which is a good place for a longer meal and fuel stop.
Before the longest stretch
Fuel check
Top up before Purple Heart Trail if your tank is already low. That segment runs about 75.9 miles.
Arriving in San Antonio, TX
The final approach into San Antonio, TX usually feels slower than the middle of the drive, so avoid planning your tightest schedule at the very end.
Try to arrive with enough fuel left to skip an immediate station stop unless you already know the area around San Antonio, TX.
These stop ideas are pacing suggestions — the exact town or exit can change with traffic, hotel plans, and fuel range.
National Parks Near This Route
Worth a detour if your schedule allows.
San Antonio Missions National Historical Park
National Historical Park
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 153.2
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...
Park data from the National Park Service API. Alerts update every 2 hours.
Fuel & Cost
Regular Gas
$23.15 one way
$46.30 round trip
$3.84/gal25.4 MPG avg54 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$4.20
$25.34
$50.68
premium
$4.54
$27.35
$54.71
diesel
$5.61
$33.82
$67.65
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$23
Meals
$25–$50
Total
$48–$73
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 53.6 kg one way.
Prices: EIA weekly data, 2026-04-13.
Driving Electric?
About $16 in charging
· 0 stops
· 67% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
46
0
$16.09
$7.35
Efficient EV
38.3
0
$13.40
$6.13
EV Truck/SUV
61.3
0
$21.45
$9.80
Gas CO2
54 kg
EV CO2
18 kg (67% less)
This trip is well within single-charge range for most EVs. No charging stops needed if you start fully charged.
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 15, 2026
Origin
Troy, TX
Evening
in Troy on Thursday
Local time
5:01 PM
CDT
Current temp
60°F
Unavailable
Live forecast
Destination
San Antonio, TX
Evening
in San Antonio on Thursday
Local time
5:01 PM
CDT
Current temp
77°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
17 degrees warmer at arrival
A meaningful temperature swing is a good cue to rethink layers, water, and how soon you want to arrive.
Road read
2h 49m on the road
Use the two city cards together: check the sky where you start, then compare it with the local time and temperature at arrival.
Weather data from the National Weather Service. Conditions may change; check closer to your travel date.
Frequently Asked Questions
The drive from Troy, TX to San Antonio, TX covers 153.2 miles and takes about 2h 49m without stops. Add 15-30 minutes for a fuel or rest stop on longer drives.
The main roads are Purple Heart Trail, I 35, North Pan Am Expressway. Expect a mix of highway and local road driving.
This is a comfortable same-day trip.
The midpoint is about 76.6 miles from Troy, TX. Look for rest areas, gas stations, or food options near the halfway mark.
At current regular gas prices, expect to spend about $23.15 one way. This estimate uses 25.4 MPG — your actual cost will vary with your vehicle's fuel efficiency and current gas prices.
Leave by 9 AM and you'll arrive before lunch. Even a 4 PM departure gets you there before dark in summer.
Plan about 1 meaningful break for fuel, food, or rest. A short stop every 2 to 3 hours is enough for this drive.
This is a demanding drive. With 16 significant decision points across 153.2 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.
The main spots that need attention: at 15.8 miles (I 35): Highway fork - watch signs carefully. Lane positioning matters here; at 71.6 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 145 miles (I 35 / North Pan Am Expressway): Highway fork - watch signs carefully. Lane positioning matters here.
The route from Troy, TX to San Antonio, TX does not surface many named destination signs beyond the main corridor.
