How far is San Antonio, TX from Sam Rayburn, TX?
The driving distance from San Antonio, TX to Sam Rayburn, TX is about 340.5 miles (548 km), with a travel time of about 06h 08m by car.
- The straight-line flight distance is about 289.2 miles (465.4 km).
- For a round trip, plan for roughly 12h 16m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 6:00 AM to 7:30 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 06h 08m.
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; within the Houston–The Woodlands–Sugar Land metropolitan area
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 San Antonio and Sam Rayburn.
Turn-by-Turn Driving Directions
Step-by-step road directions between San Antonio and Sam Rayburn.
-
1
Start on Dolorosa Street
44 m · 5 sec · Dolorosa Street
-
2
Continue on West Market Street
1893 ft · 42 sec · West Market Street
-
3
Continue on East Market Street
2143 ft · 46 sec · East Market Street
-
4
Turn left
111 m · 13 sec
-
5
Turn straight onto East Commerce Street
1.2 km · 1 min · East Commerce Street
-
6
Keep slight left to continue on East Commerce Street
2.7 mi · 4 min · East Commerce Street
-
7
Turn slight right onto East Houston Street
1349 ft · 31 sec · East Houston Street
-
8
Turn left onto Interstate 10 East
583 ft · 12 sec · Interstate 10 East
-
9
Take the ramp slight left toward I 10 East, US 90 East
874 ft · 21 sec
-
10
Merge slight left onto Jose Lopez Freeway
1.8 mi · 2 min · Jose Lopez Freeway
-
11
Continue on 90th Infantry Division Highway
22.2 mi · 23 min · 90th Infantry Division Highway
-
12
Continue on I 10 East: Houston, Austin, Waco
139.6 mi · 2 hr 21 min
-
13
Take the exit slight right toward TX 99 Toll North, TX 99 South: Grand Parkway
2346 ft · 45 sec
-
14
Keep slight left to continue on TX 99 Toll North: Grand Parkway
1 km · 1 min
-
15
Keep slight left to continue on TX 99 Toll North
854 ft · 21 sec
-
16
Merge slight left onto West Grand Parkway North
51.5 mi · 56 min · West Grand Parkway North
-
17
Take the exit slight right toward I 69 North: Cleveland
2628 ft · 1 min
-
18
Continue straight
1.2 km · 1 min
-
19
Merge slight left onto Eastex Freeway
11 mi · 12 min · Eastex Freeway
-
20
Keep slight left
1.1 km · 44 sec
-
21
Continue straight
30.8 mi · 32 min
-
22
Take the exit slight right
2255 ft · 1 min
-
23
Continue on Pan American Drive
1.3 mi · 2 min · Pan American Drive
-
24
Continue on South Washington Avenue
3140 ft · 59 sec · South Washington Avenue
-
25
Turn right onto East Church Street
24.8 mi · 28 min · East Church Street
-
26
Continue on US Highway 190 West
34.7 mi · 39 min · US Highway 190 West
-
27
Turn left onto South Main Street
2.3 mi · 5 min · South Main Street
-
28
Merge slight right onto North Wheeler Street
8.1 mi · 8 min · North Wheeler Street
-
29
Turn left onto Sam Rayburn Parkway
3.3 mi · 5 min · Sam Rayburn Parkway
-
30
Turn right
65 m · 6 sec
-
31
Arrive at your destination
0 m · 1 sec
Car Route Details
A richer read on the saved driving route between San Antonio and Sam Rayburn.
Long-distance drive
This route is long enough that fuel, rest stops, weather, and timing matter more than any single maneuver.
I 10 East
Continue on I 10 East: Houston, Austin, Waco
140 mi · 02h 21m
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.
Sunny leaving San Antonio and Mostly Sunny near Sam Rayburn.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from San Antonio to Sam Rayburn?
The road trip is about 340.5 miles (548 km) and usually takes 06h 08m 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?
Katy is a useful midpoint, sitting about 170.1 miles from San Antonio and 170.4 miles from Sam Rayburn.
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 51.3 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 CST. 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 $43.01 one way or $86.02 round trip. Estimated CO2 is about 106.7 kg one way.
What should you check before leaving?
Before you leave, expect Sunny around San Antonio and Mostly Sunny near Sam Rayburn.
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 San Antonio and Sam Rayburn. Straight-line distance: 289.17 mi (465.38 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 Sam Rayburn
Sam Rayburn is a place in Texas, United States.
| Population | 0 |
| Coordinates | 31.0640800, -94.0357500 |
| Altitude | 61 |
| Country | United States |
End: Sam Rayburn (-94.03575, 31.06408)
Estimated Travel Time
Distance: 548 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 11h 20m |
| 40 mph (64.37 km/h) | 08h 30m |
| 50 mph (80.47 km/h) | 06h 48m |
| 60 mph (96.56 km/h) | 05h 40m |
| 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 | $3.58 | $43.01 | $86.02 |
| Mid-grade | $4.09 | $49.17 | $98.34 |
| Premium | $4.47 | $53.71 | $107.42 |
| Diesel | $5.68 | $68.24 | $136.48 |
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