How far is San Antonio, TX from Southmayd, TX?
The driving distance from San Antonio, TX to Southmayd, TX is about 339.6 miles (546.5 km), with a travel time of about 06h 13m by car.
- The straight-line flight distance is about 307.8 miles (495.4 km).
- For a round trip, plan for roughly 12h 27m 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 13m.
Starting early still helps, but most travelers will want a longer stop or an overnight stay on a route this long.
This departure sits inside the recommended comfort window for the route.
Halfway Point
A useful midpoint for breaks, coffee, or meeting in the middle.
City in Texas, United States
Route Weather Snapshot
Check the forecast at both ends before you head out.
Showers And Thunderstorms
Chance Rain Showers
Driving Route Map
The map below follows the saved road route between San Antonio and Southmayd.
Turn-by-Turn Driving Directions
Step-by-step road directions between San Antonio and Southmayd.
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1
Start on Dolorosa Street
44 m · 5 sec · Dolorosa Street
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2
Continue on West Market Street
1893 ft · 42 sec · West Market Street
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3
Continue on East Market Street
2143 ft · 46 sec · East Market Street
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4
Turn left
111 m · 13 sec
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5
Turn straight onto East Commerce Street
66 m · 13 sec · East Commerce Street
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6
Take the ramp sharp left toward US 281 North, I 37 North
1159 ft · 28 sec
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7
Merge slight left onto William J Bordelon Freeway
1.3 km · 56 sec · William J Bordelon Freeway
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8
Take the exit slight right toward I 35 North: Austin
2907 ft · 1 min
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9
Merge slight left onto North Pan Am Expressway
8.2 mi · 10 min · North Pan Am Expressway
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10
Keep slight left to continue on North Pan Am Expressway
7.4 mi · 8 min · North Pan Am Expressway
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11
Continue on Purple Heart Trail
11.9 mi · 13 min · Purple Heart Trail
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12
Continue on Interstate Highway 35
1.9 mi · 2 min · Interstate Highway 35
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13
Continue on Purple Heart Trail
47.8 mi · 52 min · Purple Heart Trail
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14
Keep slight right to continue on Purple Heart Trail
95.6 mi · 1 hr 40 min · Purple Heart Trail
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15
Continue on South Jack Kultgen Expressway
6.6 mi · 8 min · South Jack Kultgen Expressway
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16
Continue on Purple Heart Trail
33 mi · 33 min · Purple Heart Trail
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17
Keep slight right to continue on I 35E: Dallas
59.2 mi · 1 hr 2 min
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18
Take the exit slight right toward Oak Lawn Avenue
125 m · 8 sec
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19
Keep slight right
143 m · 10 sec
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20
Turn right onto Oak Lawn Avenue
1319 ft · 31 sec · Oak Lawn Avenue
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21
Take the ramp slight left toward DNT North
1081 ft · 28 sec
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22
Merge slight left onto Dallas North Tollway
30.3 mi · 34 min · Dallas North Tollway
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23
Turn straight onto South Dallas Parkway
4.7 mi · 7 min · South Dallas Parkway
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24
Turn right onto West Outer Loop
1.7 mi · 3 min · West Outer Loop
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25
Turn left onto South Preston Road
23.3 mi · 28 min · South Preston Road
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26
Turn slight right onto TX 56: Southmayd, Sherman
1701 ft · 39 sec
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27
Turn left onto State Highway 56
4.2 mi · 5 min · State Highway 56
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28
Turn right onto McElroy Street
1497 ft · 1 min · McElroy Street
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29
Turn right onto Belknap Road
118 m · 17 sec · Belknap Road
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30
Arrive at your destination
0 m · 1 sec · Belknap Road
Car Route Details
A richer read on the saved driving route between San Antonio and Southmayd.
Long-distance drive
This route is long enough that fuel, rest stops, weather, and timing matter more than any single maneuver.
Purple Heart Trail
Keep slight right to continue on Purple Heart Trail
95.6 mi · 01h 40m
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.
Showers And Thunderstorms leaving San Antonio and Chance Rain Showers near Southmayd.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from San Antonio to Southmayd?
The road trip is about 339.6 miles (546.5 km) and usually takes 06h 13m 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?
Hewitt is a useful midpoint, sitting about 170.1 miles from San Antonio and 169.5 miles from Southmayd.
How much longer is the road route than the straight-line distance?
The direct path is about 307.8 miles (495.4 km), while the road route adds roughly 31.8 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 $45.27 one way or $90.54 round trip. Estimated CO2 is about 106.5 kg one way.
What should you check before leaving?
Before you leave, expect Showers And Thunderstorms around San Antonio and Chance Rain Showers near Southmayd.
Stop Ideas Near Hewitt
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 Hewitt.
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Flight Path Map
This map shows the direct air route between San Antonio and Southmayd. Straight-line distance: 307.85 mi (495.43 km).
#1 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 |
#2 Southmayd
City in Grayson County, Texas, United States
| Population | 1,176 |
| Coordinates | 33.6303800, -96.7691600 |
| Altitude | 224 |
| Country | United States |
End: Southmayd (-96.76916, 33.63038)
Estimated Travel Time
Distance: 547 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 11h 18m |
| 40 mph (64.37 km/h) | 08h 29m |
| 50 mph (80.47 km/h) | 06h 47m |
| 60 mph (96.56 km/h) | 05h 39m |
| 70 mph (112.65 km/h) | 04h 51m |
| 80 mph (129 km/h) | 04h 14m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.78 | $45.27 | $90.54 |
| Mid-grade | $4.25 | $50.94 | $101.88 |
| Premium | $4.59 | $55.00 | $110.00 |
| Diesel | $3.99 | $47.84 | $95.67 |
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 01, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.