How far is Port Isabel, TX from Montopolis, TX?
The driving distance from Port Isabel, TX to Montopolis, TX is about 371.8 miles (598.4 km), with a travel time of about 05h 43m by car.
- The straight-line flight distance is about 289.6 miles (466.1 km).
- For a round trip, plan for roughly 11h 26m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 6:00 AM to 8:00 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 05h 43m.
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 San Patricio County, Texas, United States
Route Weather Snapshot
Check the forecast at both ends before you head out.
Showers And Thunderstorms Likely
Slight Chance Rain Showers then Mostly Cloudy
Driving Route Map
The map below follows the saved road route between Port Isabel and Montopolis.
Turn-by-Turn Driving Directions
Step-by-step road directions between Port Isabel and Montopolis.
-
1
Start on South Musina Street
985 ft · 33 sec · South Musina Street
-
2
Turn left onto West Queen Isabella Boulevard
741 ft · 23 sec · West Queen Isabella Boulevard
-
3
Turn straight onto State Highway 100
1 mi · 3 min · State Highway 100
-
4
Turn left
14.1 mi · 15 min
-
5
Take the exit slight right toward TX 550
936 ft · 23 sec
-
6
Keep slight right to continue on TX 550
14 m · 1 sec
-
7
Turn right onto State Highway 550
3.6 mi · 4 min · State Highway 550
-
8
Continue straight
1.9 mi · 2 min
-
9
Continue on I-169, TX 550 Toll
1.5 km · 59 sec · I-169, TX 550 Toll
-
10
Continue on Interstate 169
3.6 mi · 4 min · Interstate 169
-
11
Merge slight left onto North Expressway
2.2 mi · 2 min · North Expressway
-
12
Continue on U.S. Highway 77
102 mi · 1 hr 53 min · U.S. Highway 77
-
13
Keep slight left
1157 ft · 14 sec
-
14
Merge slight right
1.2 mi · 1 min
-
15
Continue on U.S. Highway 77
11.6 mi · 13 min · U.S. Highway 77
-
16
Take the exit slight right
1410 ft · 34 sec
-
17
Turn straight onto US Highway 77 Frontage Road
148 m · 18 sec · US Highway 77 Frontage Road
-
18
Turn right onto County Road 10
1 mi · 4 min · County Road 10
-
19
Turn left onto County Road 79
4 mi · 16 min · County Road 79
-
20
Turn left onto County Road 18
848 ft · 44 sec · County Road 18
-
21
Turn sharp right
1.1 mi · 3 min
-
22
Take the ramp straight
2351 ft · 57 sec
-
23
Merge slight left onto Driscoll Bypass
2.3 mi · 2 min · Driscoll Bypass
-
24
Continue on U.S. Highway 77
13.2 mi · 14 min · U.S. Highway 77
-
25
Merge slight left
1.4 mi · 1 min
-
26
Keep slight left
1.3 mi · 1 min
-
27
Continue straight
18.3 mi · 18 min
-
28
Take the exit slight right toward TX 359: Mathis, Skidmore
1275 ft · 33 sec
-
29
Turn right onto State Highway 359
12.4 mi · 17 min · State Highway 359
-
30
At the end of the road, turn left onto South 8th Street
1.3 km · 56 sec · South 8th Street
-
31
Continue on US Highway 181 South
40.2 mi · 46 min · US Highway 181 South
-
32
Continue on South Sunset Strip Drive
1.2 mi · 1 min · South Sunset Strip Drive
-
33
Turn right onto West Main Street
1.2 km · 1 min · West Main Street
-
34
Keep slight left to continue on East Main Street
71 m · 4 sec · East Main Street
-
35
Continue on Helena Road
8.4 mi · 11 min · Helena Road
-
36
Turn straight onto State Highway 80
23.6 mi · 26 min · State Highway 80
-
37
Continue on South Nixon Avenue
1 mi · 2 min · South Nixon Avenue
-
38
Continue on State Highway 80 North
30.8 mi · 35 min · State Highway 80 North
-
39
Continue on US 183
10.1 mi · 12 min · US 183
-
40
Continue on South Colorado Street
4.9 mi · 9 min · South Colorado Street
-
41
Continue on United States Highway 183
1282 ft · 17 sec · United States Highway 183
-
42
Keep slight left to continue on TX 130 Toll North: Austin, Waco
2447 ft · 35 sec
-
43
Merge slight left onto Pickle Parkway
9.8 mi · 9 min · Pickle Parkway
-
44
Take the exit slight right toward US 183 North: Austin
1920 ft · 47 sec
-
45
Continue on US Highway 183 South
11.8 mi · 15 min · US Highway 183 South
-
46
Continue on Bergstrom Expressway
1.1 km · 41 sec · Bergstrom Expressway
-
47
Take the exit slight right toward Loop 111: Cesar Chavez Street, 5th Street, 6th Street, 7th Street, Airport Boulevard
2724 ft · 54 sec
-
48
Keep slight right to continue on Airport Boulevard
1278 ft · 34 sec · Airport Boulevard
-
49
Continue on Airport Boulevard
2658 ft · 43 sec · Airport Boulevard
-
50
Continue on Ed Bluestein Boulevard
552 ft · 9 sec · Ed Bluestein Boulevard
-
51
Take the ramp straight toward 183 Toll South: Lockhart
148 m · 12 sec
-
52
Arrive at your destination
0 m · 1 sec
Car Route Details
A richer read on the saved driving route between Port Isabel and Montopolis.
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
Continue on U.S. Highway 77
102 mi · 01h 53m
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.
Showers And Thunderstorms Likely leaving Port Isabel and Slight Chance Rain Showers then Mostly Cloudy near Montopolis.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Port Isabel to Montopolis?
The road trip is about 371.8 miles (598.4 km) and usually takes 05h 43m 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?
Odem is a useful midpoint, sitting about 173.3 miles from Port Isabel and 198.5 miles from Montopolis.
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 82.2 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 CDT. If you want a more comfortable same-day return, try to leave by 5:34 AM CDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $49.58 one way or $99.16 round trip. Estimated CO2 is about 116.6 kg one way.
What should you check before leaving?
Before you leave, expect Showers And Thunderstorms Likely around Port Isabel and Slight Chance Rain Showers then Mostly Cloudy near Montopolis.
Flight Path Map
This map shows the direct air route between Port Isabel and Montopolis. Straight-line distance: 289.6 mi (466.07 km).
#1 Port Isabel
City in Cameron County, Texas, United States
| Population | 6,226 |
| Coordinates | 26.0734100, -97.2085800 |
| Altitude | 2 |
| Country | United States |
#2 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 |
End: 183 Toll (-97.690637, 30.243248)
Estimated Travel Time
Distance: 598 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 12h 23m |
| 40 mph (64.37 km/h) | 09h 17m |
| 50 mph (80.47 km/h) | 07h 26m |
| 60 mph (96.56 km/h) | 06h 11m |
| 70 mph (112.65 km/h) | 05h 18m |
| 80 mph (129 km/h) | 04h 38m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.78 | $49.58 | $99.16 |
| Mid-grade | $4.25 | $55.79 | $111.57 |
| Premium | $4.59 | $60.23 | $120.47 |
| Diesel | $3.99 | $52.39 | $104.78 |
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.