How far is Montopolis, TX from Port Isabel, TX?
The driving distance from Montopolis, TX to Port Isabel, TX is about 341.9 miles (550.3 km), with a travel time of about 06h 31m by car.
- The straight-line flight distance is about 289.6 miles (466.1 km).
- For a round trip, plan for roughly 13h 02m 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 31m.
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 San Patricio County, 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 Montopolis and Port Isabel.
Turn-by-Turn Driving Directions
Step-by-step road directions between Montopolis and Port Isabel.
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1
Start on 183 Toll South: Lockhart
67 m · 5 sec
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2
Merge slight left onto Bergstrom Expressway
1.3 km · 47 sec · Bergstrom Expressway
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3
Continue on Bastrop Highway
11.7 mi · 15 min · Bastrop Highway
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4
Take the ramp straight toward TX 130 Toll South: Lockhart, San Antonio
1565 ft · 38 sec
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5
Merge slight left onto Pickle Parkway
9.8 mi · 9 min · Pickle Parkway
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6
Take the exit slight right toward US 183 South: Lockhart
1219 ft · 30 sec
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7
Continue on United States Highway 183
2699 ft · 35 sec · United States Highway 183
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8
Continue on North Colorado Street
4.9 mi · 9 min · North Colorado Street
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9
Continue on US 183
10.1 mi · 12 min · US 183
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10
Continue on North Magnolia Avenue
4.2 mi · 7 min · North Magnolia Avenue
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11
Continue straight
51.2 mi · 57 min
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12
Turn slight left onto Farm-to-Market Road 792
8.4 mi · 11 min · Farm-to-Market Road 792
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13
Continue on East Main Street
1.3 km · 1 min · East Main Street
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14
Turn left onto South Sunset Strip Drive
1.2 mi · 1 min · South Sunset Strip Drive
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15
Continue on South US Highway 181
40.2 mi · 46 min · South US Highway 181
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16
Continue on North 8th Street
1.3 km · 56 sec · North 8th Street
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17
Continue on US Highway 181 South
16.1 mi · 18 min · US Highway 181 South
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18
Take the exit slight right
1648 ft · 45 sec
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19
Keep slight right to continue on US Route 181
65 m · 6 sec · US Route 181
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20
Turn straight onto US Highway 181
1.1 km · 1 min · US Highway 181
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21
Take the ramp right
1926 ft · 47 sec
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22
Merge slight left
11.9 mi · 14 min
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23
Take the exit straight toward I 37, US 77, I 69E
538 ft · 13 sec
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24
Keep slight left
1965 ft · 48 sec
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25
Merge slight right
2.5 mi · 2 min
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26
Take the exit slight right toward I 69E, US 77: Kingsville, Brownsville
31.3 mi · 34 min
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27
Keep slight left to continue on U.S. Highway 77
61.3 mi · 1 hr 9 min · U.S. Highway 77
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28
Keep slight left to continue on U.S. Highway 77
43.7 mi · 47 min · U.S. Highway 77
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29
Continue on North Expressway
2.1 mi · 2 min · North Expressway
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30
Keep slight right to continue on Interstate 169
3.7 mi · 4 min · Interstate 169
-
31
Continue on I-169, TX 550 Toll
1.3 km · 52 sec · I-169, TX 550 Toll
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32
Continue straight
2 mi · 2 min
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33
Continue on State Highway 550
3.7 mi · 4 min · State Highway 550
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34
Turn left
1123 ft · 27 sec
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35
Merge slight left onto Brownsville-Port Isabel Highway
14.1 mi · 16 min · Brownsville-Port Isabel Highway
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36
Turn right onto State Highway 100
1 mi · 3 min · State Highway 100
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37
Turn slight right onto West Queen Isabella Boulevard
779 ft · 24 sec · West Queen Isabella Boulevard
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38
Turn right onto South Musina Street
865 ft · 25 sec · South Musina Street
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39
Arrive at your destination
0 m · 1 sec · South Musina Street
Car Route Details
A richer read on the saved driving route between Montopolis and Port Isabel.
Long-distance drive
This route is long enough that fuel, rest stops, weather, and timing matter more than any single maneuver.
U.S. Highway 77
Keep slight left to continue on U.S. Highway 77
61.3 mi · 01h 10m
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 Montopolis 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 Montopolis to Port Isabel?
The road trip is about 341.9 miles (550.3 km) and usually takes 06h 31m 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?
Odem is a useful midpoint, sitting about 171.4 miles from Montopolis and 170.6 miles from Port Isabel.
How much longer is the road route than the straight-line distance?
The direct path is about 289.6 miles (466.1 km), while the road route adds roughly 52.3 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 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 $45.57 one way or $91.15 round trip. Estimated CO2 is about 107.2 kg one way.
What should you check before leaving?
Before you leave, expect Slight Chance Rain Showers then Mostly Cloudy around Montopolis and Showers And Thunderstorms Likely near Port Isabel.
Flight Path Map
This map shows the direct air route between Montopolis and Port Isabel. Straight-line distance: 289.6 mi (466.07 km).
#1 Montopolis
This Travis County community, situated at an elevation of 469 feet, is known for its Colorado River industrial areas.
| Population | 912,791 |
| Coordinates | 30.2432700, -97.6905600 |
| Altitude | 143 |
| 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: 550 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 11h 23m |
| 40 mph (64.37 km/h) | 08h 32m |
| 50 mph (80.47 km/h) | 06h 50m |
| 60 mph (96.56 km/h) | 05h 41m |
| 70 mph (112.65 km/h) | 04h 53m |
| 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 | $3.78 | $45.57 | $91.15 |
| Mid-grade | $4.25 | $51.28 | $102.56 |
| Premium | $4.59 | $55.37 | $110.73 |
| Diesel | $3.99 | $48.16 | $96.31 |
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.