How far is Austin, TX from Port Isabel, TX?
The driving distance from Austin, TX to Port Isabel, TX is about 365.7 miles (588.6 km), with a travel time of about 06h 35m by car.
- The straight-line flight distance is about 291.6 miles (469.3 km).
- For a round trip, plan for roughly 13h 10m 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 35m.
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
Route Weather Snapshot
Check the forecast at both ends before you head out.
Slight Chance Rain Showers then Mostly Cloudy
Showers And Thunderstorms Likely
Driving Route Map
The map below follows the saved road route between Austin and Port Isabel.
Turn-by-Turn Driving Directions
Step-by-step road directions between Austin and Port Isabel.
-
1
Start on East 5th Street
2551 ft · 1 min · East 5th Street
-
2
At the end of the road, turn right onto North Interstate 35
1893 ft · 40 sec · North Interstate 35
-
3
Take the ramp slight left toward I 35 South
899 ft · 22 sec
-
4
Merge slight left onto Purple Heart Trail
46.4 mi · 50 min · Purple Heart Trail
-
5
Continue on Interstate Highway 35
1.7 mi · 2 min · Interstate Highway 35
-
6
Continue on Purple Heart Trail
11.9 mi · 13 min · Purple Heart Trail
-
7
Continue on North Pan Am Expressway
10 mi · 12 min · North Pan Am Expressway
-
8
Keep slight right to continue on Connally Loop
11 mi · 12 min · Connally Loop
-
9
Take the exit slight right toward I 37, US 281 North: San Antonio, Corpus Christi
1184 ft · 29 sec
-
10
Keep slight left to continue on I 37 South: Corpus Christi
2457 ft · 1 min
-
11
Merge slight left
118.7 mi · 1 hr 59 min
-
12
Take the exit slight right toward I 69E, US 77: Kingsville, Brownsville
31.3 mi · 34 min
-
13
Keep slight left to continue on U.S. Highway 77
61.3 mi · 1 hr 9 min · U.S. Highway 77
-
14
Keep slight left to continue on U.S. Highway 77
43.7 mi · 47 min · U.S. Highway 77
-
15
Continue on North Expressway
2.1 mi · 2 min · North Expressway
-
16
Keep slight right to continue on Interstate 169
3.7 mi · 4 min · Interstate 169
-
17
Continue on I-169, TX 550 Toll
1.3 km · 52 sec · I-169, TX 550 Toll
-
18
Continue straight
2 mi · 2 min
-
19
Continue on State Highway 550
3.7 mi · 4 min · State Highway 550
-
20
Turn left
1123 ft · 27 sec
-
21
Merge slight left onto Brownsville-Port Isabel Highway
14.1 mi · 16 min · Brownsville-Port Isabel Highway
-
22
Turn right onto State Highway 100
1 mi · 3 min · State Highway 100
-
23
Turn slight right onto West Queen Isabella Boulevard
779 ft · 24 sec · West Queen Isabella Boulevard
-
24
Turn right onto South Musina Street
865 ft · 25 sec · South Musina Street
-
25
Arrive at your destination
0 m · 1 sec · South Musina Street
Car Route Details
A richer read on the saved driving route between Austin and Port Isabel.
Long-distance drive
This route is long enough that fuel, rest stops, weather, and timing matter more than any single maneuver.
I 37 South
Merge slight left
119 mi · 01h 59m
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.
Slight Chance Rain Showers then Mostly Cloudy leaving Austin and Showers And Thunderstorms Likely near Port Isabel.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Austin to Port Isabel?
The road trip is about 365.7 miles (588.6 km) and usually takes 06h 35m 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?
Mathis is a useful midpoint, sitting about 183.2 miles from Austin and 182.5 miles from Port Isabel.
How much longer is the road route than the straight-line distance?
The direct path is about 291.6 miles (469.3 km), while the road route adds roughly 74.1 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 $48.75 one way or $97.50 round trip. Estimated CO2 is about 114.6 kg one way.
What should you check before leaving?
Before you leave, expect Slight Chance Rain Showers then Mostly Cloudy around Austin and Showers And Thunderstorms Likely near Port Isabel.
Flight Path Map
This map shows the direct air route between Austin and Port Isabel. Straight-line distance: 291.58 mi (469.25 km).
#1 Austin
The eleventh most populous city in the United States and the center of the Austin metropolitan area.
| Population | 995,484 |
| Coordinates | 30.2671500, -97.7430600 |
| Altitude | 149 |
| Country | United States |
#2 Port Isabel
City in Cameron County, Texas, United States
| Population | 6,226 |
| Coordinates | 26.0734100, -97.2085800 |
| Altitude | 2 |
| Country | United States |
End: Port Isabel (-97.20858, 26.07341)
Estimated Travel Time
Distance: 589 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 12h 11m |
| 40 mph (64.37 km/h) | 09h 08m |
| 50 mph (80.47 km/h) | 07h 18m |
| 60 mph (96.56 km/h) | 06h 05m |
| 70 mph (112.65 km/h) | 05h 13m |
| 80 mph (129 km/h) | 04h 33m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.78 | $48.75 | $97.50 |
| Mid-grade | $4.25 | $54.85 | $109.70 |
| Premium | $4.59 | $59.22 | $118.45 |
| Diesel | $3.99 | $51.51 | $103.02 |
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 · Apr 19, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.