How far is Sam Rayburn, TX from San Antonio, TX?
The driving distance from Sam Rayburn, TX to San Antonio, TX is about 340.9 miles (548.6 km), with a travel time of about 05h 24m by car.
- The straight-line flight distance is about 289.2 miles (465.4 km).
- For a round trip, plan for roughly 10h 49m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 6:00 AM to 8:00 AM CST.
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 05h 24m.
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.
City in Texas, United States; within the Houston–The Woodlands–Sugar Land metropolitan area
Route Weather Snapshot
Check the forecast at both ends before you head out.
Mostly Sunny
Sunny
Driving Route Map
The map below follows the saved road route between Sam Rayburn and San Antonio.
Turn-by-Turn Driving Directions
Step-by-step road directions between Sam Rayburn and San Antonio.
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1
Start on the route
65 m · 10 sec
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2
Turn left onto Sam Rayburn Parkway
3.2 mi · 4 min · Sam Rayburn Parkway
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3
Turn right
8.1 mi · 8 min
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4
Turn slight right onto North Main Street
2.3 mi · 5 min · North Main Street
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5
Turn right onto West Gibson Street
59.5 mi · 1 hr 7 min · West Gibson Street
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6
Turn left onto North Washington Avenue
3214 ft · 56 sec · North Washington Avenue
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7
Continue on Pan American Drive
1.9 mi · 3 min · Pan American Drive
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8
Take the ramp straight
695 ft · 19 sec
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9
Merge slight left
41.1 mi · 43 min
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10
Take the exit slight right toward TX 99 Toll
1357 ft · 26 sec
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11
Turn straight onto Eastex Freeway Frontage Road
1.4 mi · 3 min · Eastex Freeway Frontage Road
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12
Turn right onto North Grand Parkway East
1.4 km · 2 min · North Grand Parkway East
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13
Continue on TX 99 Toll West
1844 ft · 45 sec
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14
Merge slight left onto North Grand Parkway East
50.9 mi · 55 min · North Grand Parkway East
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15
Take the exit slight right toward I 10 East, I 10 West: Houston, San Antonio
3149 ft · 1 min
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16
Keep slight right to continue on I 10 West: San Antonio
1.1 km · 1 min
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17
Merge slight left onto Katy Freeway
149.1 mi · 2 hr 30 min · Katy Freeway
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18
Keep slight left
12 mi · 13 min
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19
Keep slight left to continue on 90th Infantry Division Highway
1.2 km · 52 sec · 90th Infantry Division Highway
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20
Continue on Jose Lopez Freeway
1.6 mi · 2 min · Jose Lopez Freeway
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21
Take the exit slight right toward Commerce Street, Houston Street
790 ft · 19 sec
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22
Turn straight onto Interstate 10 East
1830 ft · 39 sec · Interstate 10 East
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23
Turn right onto East Houston Street
963 ft · 20 sec · East Houston Street
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24
Turn slight left onto East Commerce Street
4.3 mi · 7 min · East Commerce Street
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25
Turn left onto Military Plaza
119 m · 16 sec · Military Plaza
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26
Turn left onto Dolorosa Street
100 m · 8 sec · Dolorosa Street
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27
Arrive at your destination
0 m · 1 sec · Dolorosa Street
Car Route Details
A richer read on the saved driving route between Sam Rayburn and San Antonio.
Long-distance drive
This route is long enough that fuel, rest stops, weather, and timing matter more than any single maneuver.
Katy Freeway
Merge slight left onto Katy Freeway
149 mi · 02h 30m
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.
Mostly Sunny leaving Sam Rayburn and Sunny near San Antonio.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Sam Rayburn to San Antonio?
The road trip is about 340.9 miles (548.6 km) and usually takes 05h 24m 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?
Katy is a useful midpoint, sitting about 170.1 miles from Sam Rayburn and 170.8 miles from San Antonio.
How much longer is the road route than the straight-line distance?
The direct path is about 289.2 miles (465.4 km), while the road route adds roughly 51.7 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 CST. If you want a more comfortable same-day return, try to leave by 6:10 AM CST.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $43.08 one way or $86.16 round trip. Estimated CO2 is about 106.9 kg one way.
What should you check before leaving?
Before you leave, expect Mostly Sunny around Sam Rayburn and Sunny near San Antonio.
Stop Ideas Near Katy
Useful break, food, and waypoint ideas within about 15 miles of the route midpoint.
Katy Visitors Center
Katy City Hall
Houston Police Department Westside
Transit and Meeting Points
Useful pickup, handoff, or rendezvous points close to Katy.
Prairie View, TX
Houston
Houston, TX
Bryan, TX
Flight Path Map
This map shows the direct air route between Sam Rayburn and San Antonio. Straight-line distance: 289.17 mi (465.38 km).
#1 Sam Rayburn
Sam Rayburn is a place in Texas, United States.
| Population | 0 |
| Coordinates | 31.0640800, -94.0357500 |
| Altitude | 61 |
| 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: 549 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 11h 21m |
| 40 mph (64.37 km/h) | 08h 31m |
| 50 mph (80.47 km/h) | 06h 49m |
| 60 mph (96.56 km/h) | 05h 40m |
| 70 mph (112.65 km/h) | 04h 52m |
| 80 mph (129 km/h) | 04h 15m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.58 | $43.08 | $86.16 |
| Mid-grade | $4.09 | $49.25 | $98.50 |
| Premium | $4.47 | $53.80 | $107.60 |
| Diesel | $5.68 | $68.35 | $136.71 |
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 · Nov 06, 2026