How far is Alton, TX from San Antonio, TX?
The driving distance from Alton, TX to San Antonio, TX is about 239.2 miles (384.9 km), with a travel time of about 03h 39m by car.
- The straight-line flight distance is about 217 miles (349.2 km).
- For a round trip, plan for roughly 07h 19m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 6:00 AM to 8:00 AM CDT.
Reverse, save, or send this route
This drive is better planned with a longer stop or an overnight stay. Copy the route link, send it to another device, or print a clean version before you head out.
This drive is better planned with a longer stop or an overnight stay.
Flight Distance
Driving Distance
Gas Cost Calculator
Leave and Arrive Planner
Pick a departure time to see your estimated arrival and same-day return window.
Drive time stays fixed at 03h 39m.
An early departure helps you fit a real stop into the day without turning the return into a late-night drive.
You are leaving earlier than the recommended window, which gives you extra margin for breaks and traffic.
Halfway Point
A useful midpoint for breaks, coffee, or meeting in the middle.
Route Weather Snapshot
Check the forecast at both ends before you head out.
Mostly Sunny
Driving Route Map
The map below follows the saved road route between Alton and San Antonio.
Turn-by-Turn Driving Directions
Step-by-step road directions between Alton and San Antonio.
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1
Start on Main Avenue
31 m · 6 sec · Main Avenue
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2
Turn right
2 mi · 3 min
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3
Continue straight
9.1 mi · 14 min
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4
At the end of the road, turn left onto North 10th Avenue
122 m · 13 sec · North 10th Avenue
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5
Turn right onto West McIntyre Street
115 m · 14 sec · West McIntyre Street
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6
Turn left onto North Closner Boulevard
3.3 mi · 5 min · North Closner Boulevard
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7
Turn straight onto North Expressway 281
1.1 km · 1 min · North Expressway 281
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8
Take the ramp slight left toward I 69C North, US 281 North
1516 ft · 37 sec
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9
Merge slight left
68 mi · 1 hr 12 min
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10
Keep slight right
70.2 mi · 1 hr 20 min
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11
Keep slight left to continue on Nueces Street
14.7 mi · 19 min · Nueces Street
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12
Continue straight
1199 ft · 16 sec
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13
Take the exit straight
68.8 mi · 1 hr 11 min
-
14
Take the exit slight right toward Commerce Street, Downtown, The Alamo
1358 ft · 33 sec
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15
Turn straight onto Interstate 37 South
116 m · 12 sec · Interstate 37 South
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16
Turn left onto East Commerce Street
1.4 km · 2 min · East Commerce Street
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17
Turn left onto Military Plaza
119 m · 16 sec · Military Plaza
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18
Turn left onto Dolorosa Street
100 m · 8 sec · Dolorosa Street
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19
Arrive at your destination
0 m · 1 sec · Dolorosa Street
Car Route Details
A richer read on the saved driving route between Alton and San Antonio.
Straightforward drive
The saved road route has a manageable number of maneuvers and should be easy to follow with normal attention to signs.
I 69C North
Keep slight right
70.2 mi · 01h 20m
Route Summary
A quick read on whether this route feels easy, ambitious, or worth planning around.
A longer out-and-back drive
This is still possible in one day, but it becomes a long driving day. Leaving early and planning your stop window matters more here.
Partly Sunny leaving Alton and Mostly Sunny near San Antonio.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Alton to San Antonio?
The road trip is about 239.2 miles (384.9 km) and usually takes 03h 39m in normal driving conditions.
Is this a same-day trip or an overnight route?
This is still possible in one day, but it becomes a long driving day. Leaving early and planning your stop window matters more here.
What is the halfway point on this route?
Alice is a useful midpoint, sitting about 119.7 miles from Alton and 119.5 miles from San Antonio.
How much longer is the road route than the straight-line distance?
The direct path is about 217 miles (349.2 km), while the road route adds roughly 22.2 extra miles because roads do not follow the straight air line.
When is the best time to leave for this route?
A good departure window is usually 6:00 AM to 8:00 AM CDT. If you want a more comfortable same-day return, try to leave by 9:40 AM CDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $31.89 one way or $63.79 round trip. Estimated CO2 is about 75 kg one way.
What should you check before leaving?
Before you leave, expect Partly Sunny around Alton and Mostly Sunny near San Antonio.
Flight Path Map
This map shows the direct air route between Alton and San Antonio. Straight-line distance: 217.01 mi (349.25 km).
#1 Alton
City in Texas
| Population | 18,785 |
| Coordinates | 26.2872900, -98.3133500 |
| Altitude | 49 |
| Country | United States |
#2 San Antonio
The seventh most populous city in the United States and the center of the San Antonio metropolitan area.
| Population | 1,567,118 |
| Coordinates | 29.4241200, -98.4936300 |
| Altitude | 198 |
| Country | United States |
End: Dolorosa Street (-98.493645, 29.424163)
Estimated Travel Time
Distance: 385 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 07h 58m |
| 40 mph (64.37 km/h) | 05h 58m |
| 50 mph (80.47 km/h) | 04h 47m |
| 60 mph (96.56 km/h) | 03h 59m |
| 70 mph (112.65 km/h) | 03h 25m |
| 80 mph (129 km/h) | 02h 59m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.78 | $31.89 | $63.79 |
| Mid-grade | $4.25 | $35.89 | $71.77 |
| Premium | $4.59 | $38.75 | $77.50 |
| Diesel | $3.99 | $33.70 | $67.40 |
Assumes 8.3 L/100 km (about 28.3 MPG). CO2 is an estimate and varies by vehicle, fuel blend, traffic, and terrain.
Prices in Texas · May 13, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.