How far is Mount Vernon, TX from San Antonio, TX?
The driving distance from Mount Vernon, TX to San Antonio, TX is about 396.1 miles (637.4 km), with a travel time of about 06h 07m by car.
- The straight-line flight distance is about 323.9 miles (521.3 km).
- For a round trip, plan for roughly 12h 15m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 6:00 AM to 7:30 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 06h 07m.
Starting early still helps, but most travelers will want a longer stop or an overnight stay on a route this long.
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.
City in Texas, United States of America
Route Weather Snapshot
Check the forecast at both ends before you head out.
Mostly Cloudy
Mostly Cloudy
Driving Route Map
The map below follows the saved road route between Mount Vernon and San Antonio.
Turn-by-Turn Driving Directions
Step-by-step road directions between Mount Vernon and San Antonio.
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1
Start on East Main Street
3241 ft · 1 min · East Main Street
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2
Turn left onto State Highway 37 South
1.8 mi · 3 min · State Highway 37 South
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3
Turn right onto West Interstate 30
1810 ft · 50 sec · West Interstate 30
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4
Take the ramp slight left
844 ft · 21 sec
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5
Merge slight left
100 mi · 1 hr 45 min
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6
Take the exit slight right toward I 35E: Denton, Waco
3065 ft · 1 min
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7
Keep slight left to continue on I 35E South, I 35E North: Waco, Denton
607 ft · 15 sec
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8
Keep slight left to continue on I 35E North, I 35E South: Denton, Waco
67 m · 5 sec
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9
Keep slight left to continue on I 35E South: Waco
1915 ft · 30 sec
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10
Continue on South R L Thornton Freeway
2866 ft · 44 sec · South R L Thornton Freeway
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11
Continue on South R L Thornton Freeway
89.3 mi · 1 hr 32 min · South R L Thornton Freeway
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12
Continue on North Jack Kultgen Expressway
6.6 mi · 8 min · North Jack Kultgen Expressway
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13
Continue on Purple Heart Trail
37.9 mi · 39 min · Purple Heart Trail
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14
Keep slight left
55.8 mi · 59 min
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15
Keep slight left to continue on Purple Heart Trail
49.8 mi · 55 min · Purple Heart Trail
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16
Continue on Interstate Highway 35
1.7 mi · 2 min · Interstate Highway 35
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17
Continue on Purple Heart Trail
11.9 mi · 13 min · Purple Heart Trail
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18
Continue on North Pan Am Expressway
10 mi · 12 min · North Pan Am Expressway
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19
Keep slight left to continue on North Pan Am Expressway
6.4 mi · 8 min · North Pan Am Expressway
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20
Keep slight left to continue on North Pan Am Expressway
2907 ft · 41 sec · North Pan Am Expressway
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21
Take the exit slight right toward Lexington Avenue, Main Avenue, San Pedro Avenue
684 ft · 17 sec
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22
Turn straight onto East Elmira Street
526 ft · 17 sec · East Elmira Street
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23
Turn left onto North Main Avenue
830 ft · 19 sec · North Main Avenue
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24
Enter the roundabout and take exit 2 toward Navarro Street
49 m · 3 sec · Navarro Street
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25
Exit the roundabout onto Navarro Street
34 m · 2 sec · Navarro Street
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26
Keep slight right to continue on North Main Avenue
2181 ft · 52 sec · North Main Avenue
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27
Turn right onto West Travis Street
68 m · 11 sec · West Travis Street
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28
Turn left onto North Flores Street
807 ft · 20 sec · North Flores Street
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29
Continue on Military Plaza
119 m · 16 sec · Military Plaza
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30
Turn left onto Dolorosa Street
100 m · 8 sec · Dolorosa Street
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31
Arrive at your destination
0 m · 1 sec · Dolorosa Street
Car Route Details
A richer read on the saved driving route between Mount Vernon and San Antonio.
Long-distance drive
This route is long enough that fuel, rest stops, weather, and timing matter more than any single maneuver.
West Interstate 30
Merge slight left
100 mi · 01h 45m
Route Summary
A quick read on whether this route feels easy, ambitious, or worth planning around.
Better with a longer stop
This route is long enough that most travelers will be better off planning an overnight stay or a more deliberate stop window.
Mostly Cloudy leaving Mount Vernon and Mostly Cloudy near San Antonio.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Mount Vernon to San Antonio?
The road trip is about 396.1 miles (637.4 km) and usually takes 06h 07m in normal driving conditions.
Is this a same-day trip or an overnight route?
This route is long enough that most travelers will be better off planning an overnight stay or a more deliberate stop window.
What is the halfway point on this route?
Northcrest is a useful midpoint, sitting about 188.1 miles from Mount Vernon and 208 miles from San Antonio.
How much longer is the road route than the straight-line distance?
The direct path is about 323.9 miles (521.3 km), while the road route adds roughly 72.2 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 7:30 AM CDT. Starting early still helps, but most travelers will want a longer stop or an overnight stay on a route this long.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $52.79 one way or $105.59 round trip. Estimated CO2 is about 124.2 kg one way.
What should you check before leaving?
Before you leave, expect Mostly Cloudy around Mount Vernon and Mostly Cloudy near San Antonio.
Stop Ideas Near Northcrest
Useful break, food, and waypoint ideas within about 15 miles of the route midpoint.
Transit and Meeting Points
Useful pickup, handoff, or rendezvous points close to Northcrest.
Waco, TX
McGregor
Temple
Killeen, Texas
Flight Path Map
This map shows the direct air route between Mount Vernon and San Antonio. Straight-line distance: 323.95 mi (521.34 km).
#1 Mount Vernon
Town in Texas, United States
| Population | 2,769 |
| Coordinates | 33.1887300, -95.2213300 |
| Altitude | 150 |
| 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: 637 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 13h 11m |
| 40 mph (64.37 km/h) | 09h 54m |
| 50 mph (80.47 km/h) | 07h 55m |
| 60 mph (96.56 km/h) | 06h 36m |
| 70 mph (112.65 km/h) | 05h 39m |
| 80 mph (129 km/h) | 04h 56m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.78 | $52.79 | $105.59 |
| Mid-grade | $4.25 | $59.40 | $118.80 |
| Premium | $4.59 | $64.14 | $128.27 |
| Diesel | $3.99 | $55.78 | $111.56 |
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 31, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.